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git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@83516 13f79535-47bb-0310-9956-ffa450edef68
3100 lines
83 KiB
C
3100 lines
83 KiB
C
/* ====================================================================
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* Copyright (c) 1995-1999 The Apache Group. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* 3. All advertising materials mentioning features or use of this
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* software must display the following acknowledgment:
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* "This product includes software developed by the Apache Group
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* for use in the Apache HTTP server project (http://www.apache.org/)."
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*
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* 4. The names "Apache Server" and "Apache Group" must not be used to
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* endorse or promote products derived from this software without
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* prior written permission. For written permission, please contact
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* apache@apache.org.
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*
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* 5. Products derived from this software may not be called "Apache"
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* nor may "Apache" appear in their names without prior written
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* permission of the Apache Group.
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*
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* 6. Redistributions of any form whatsoever must retain the following
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* acknowledgment:
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* "This product includes software developed by the Apache Group
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* for use in the Apache HTTP server project (http://www.apache.org/)."
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*
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* THIS SOFTWARE IS PROVIDED BY THE APACHE GROUP ``AS IS'' AND ANY
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* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE APACHE GROUP OR
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* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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* ====================================================================
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*
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* This software consists of voluntary contributions made by many
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* individuals on behalf of the Apache Group and was originally based
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* on public domain software written at the National Center for
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* Supercomputing Applications, University of Illinois, Urbana-Champaign.
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* For more information on the Apache Group and the Apache HTTP server
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* project, please see <http://www.apache.org/>.
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*
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*/
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/*
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* httpd.c: simple http daemon for answering WWW file requests
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*
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*
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* 03-21-93 Rob McCool wrote original code (up to NCSA HTTPd 1.3)
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*
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* 03-06-95 blong
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* changed server number for child-alone processes to 0 and changed name
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* of processes
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*
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* 03-10-95 blong
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* Added numerous speed hacks proposed by Robert S. Thau (rst@ai.mit.edu)
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* including set group before fork, and call gettime before to fork
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* to set up libraries.
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*
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* 04-14-95 rst / rh
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* Brandon's code snarfed from NCSA 1.4, but tinkered to work with the
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* Apache server, and also to have child processes do accept() directly.
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*
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* April-July '95 rst
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* Extensive rework for Apache.
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*/
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/* TODO: this is a cobbled together prefork MPM example... it should mostly
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* TODO: behave like apache-1.3... here's a short list of things I think
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* TODO: need cleaning up still:
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* TODO: - use ralf's mm stuff for the shared mem and mutexes
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* TODO: - clean up scoreboard stuff when we figure out how to do it in 2.0
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*/
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#define CORE_PRIVATE
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#include "httpd.h"
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#include "mpm_default.h"
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#include "http_main.h"
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#include "http_log.h"
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#include "http_config.h"
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#include "http_core.h" /* for get_remote_host */
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#include "http_connection.h"
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#include "scoreboard.h"
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#include "ap_mpm.h"
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#include "unixd.h"
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#include "iol_socket.h"
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#include "ap_listen.h"
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#ifdef USE_SHMGET_SCOREBOARD
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#include <sys/types.h>
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#include <sys/ipc.h>
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#include <sys/shm.h>
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#endif
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#ifdef HAVE_BSTRING_H
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#include <bstring.h> /* for IRIX, FD_SET calls bzero() */
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#endif
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/* config globals */
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static int ap_max_requests_per_child=0;
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static char *ap_pid_fname=NULL;
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static char *ap_scoreboard_fname=NULL;
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static char *ap_lock_fname;
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static char *ap_server_argv0=NULL;
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static int ap_daemons_to_start=0;
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static int ap_daemons_min_free=0;
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static int ap_daemons_max_free=0;
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static int ap_daemons_limit=0;
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static time_t ap_restart_time=0;
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static int ap_extended_status = 0;
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/*
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* The max child slot ever assigned, preserved across restarts. Necessary
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* to deal with MaxClients changes across SIGUSR1 restarts. We use this
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* value to optimize routines that have to scan the entire scoreboard.
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*/
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static int max_daemons_limit = -1;
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static char ap_coredump_dir[MAX_STRING_LEN];
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/* *Non*-shared http_main globals... */
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static server_rec *server_conf;
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static int sd;
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static fd_set listenfds;
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static int listenmaxfd;
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/* one_process --- debugging mode variable; can be set from the command line
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* with the -X flag. If set, this gets you the child_main loop running
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* in the process which originally started up (no detach, no make_child),
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* which is a pretty nice debugging environment. (You'll get a SIGHUP
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* early in standalone_main; just continue through. This is the server
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* trying to kill off any child processes which it might have lying
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* around --- Apache doesn't keep track of their pids, it just sends
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* SIGHUP to the process group, ignoring it in the root process.
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* Continue through and you'll be fine.).
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*/
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static int one_process = 0;
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#ifdef HAS_OTHER_CHILD
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/* used to maintain list of children which aren't part of the scoreboard */
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typedef struct other_child_rec other_child_rec;
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struct other_child_rec {
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other_child_rec *next;
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int pid;
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void (*maintenance) (int, void *, ap_wait_t);
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void *data;
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int write_fd;
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};
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static other_child_rec *other_children;
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#endif
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static pool *pconf; /* Pool for config stuff */
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static pool *pchild; /* Pool for httpd child stuff */
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static int my_pid; /* it seems silly to call getpid all the time */
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#ifndef MULTITHREAD
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static int my_child_num;
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#endif
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#ifdef TPF
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int tpf_child = 0;
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char tpf_server_name[INETD_SERVNAME_LENGTH+1];
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#endif /* TPF */
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static scoreboard *ap_scoreboard_image = NULL;
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#ifdef GPROF
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/*
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* change directory for gprof to plop the gmon.out file
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* configure in httpd.conf:
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* GprofDir logs/ -> $ServerRoot/logs/gmon.out
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* GprofDir logs/% -> $ServerRoot/logs/gprof.$pid/gmon.out
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*/
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static void chdir_for_gprof(void)
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{
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core_server_config *sconf =
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ap_get_module_config(server_conf->module_config, &core_module);
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char *dir = sconf->gprof_dir;
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if(dir) {
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char buf[512];
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int len = strlen(sconf->gprof_dir) - 1;
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if(*(dir + len) == '%') {
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dir[len] = '\0';
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ap_snprintf(buf, sizeof(buf), "%sgprof.%d", dir, (int)getpid());
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}
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dir = ap_server_root_relative(pconf, buf[0] ? buf : dir);
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if(mkdir(dir, 0755) < 0 && errno != EEXIST) {
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ap_log_error(APLOG_MARK, APLOG_ERR, server_conf,
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"gprof: error creating directory %s", dir);
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}
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}
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else {
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dir = ap_server_root_relative(pconf, "logs");
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}
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chdir(dir);
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}
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#else
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#define chdir_for_gprof()
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#endif
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/* a clean exit from a child with proper cleanup */
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static void clean_child_exit(int code) __attribute__ ((noreturn));
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static void clean_child_exit(int code)
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{
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if (pchild) {
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ap_destroy_pool(pchild);
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}
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chdir_for_gprof();
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exit(code);
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}
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#if defined(USE_FCNTL_SERIALIZED_ACCEPT) || defined(USE_FLOCK_SERIALIZED_ACCEPT)
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static void expand_lock_fname(pool *p)
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{
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/* XXXX possibly bogus cast */
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ap_lock_fname = ap_psprintf(p, "%s.%lu",
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ap_server_root_relative(p, ap_lock_fname), (unsigned long)getpid());
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}
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#endif
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#if defined (USE_USLOCK_SERIALIZED_ACCEPT)
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#include <ulocks.h>
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static ulock_t uslock = NULL;
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#define accept_mutex_child_init(x)
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static void accept_mutex_init(pool *p)
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{
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ptrdiff_t old;
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usptr_t *us;
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/* default is 8, allocate enough for all the children plus the parent */
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if ((old = usconfig(CONF_INITUSERS, HARD_SERVER_LIMIT + 1)) == -1) {
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perror("usconfig(CONF_INITUSERS)");
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exit(-1);
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}
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if ((old = usconfig(CONF_LOCKTYPE, US_NODEBUG)) == -1) {
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perror("usconfig(CONF_LOCKTYPE)");
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exit(-1);
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}
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if ((old = usconfig(CONF_ARENATYPE, US_SHAREDONLY)) == -1) {
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perror("usconfig(CONF_ARENATYPE)");
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exit(-1);
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}
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if ((us = usinit("/dev/zero")) == NULL) {
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perror("usinit");
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exit(-1);
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}
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if ((uslock = usnewlock(us)) == NULL) {
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perror("usnewlock");
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exit(-1);
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}
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}
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static void accept_mutex_on(void)
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{
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switch (ussetlock(uslock)) {
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case 1:
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/* got lock */
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break;
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case 0:
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fprintf(stderr, "didn't get lock\n");
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clean_child_exit(APEXIT_CHILDFATAL);
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case -1:
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perror("ussetlock");
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clean_child_exit(APEXIT_CHILDFATAL);
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}
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}
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static void accept_mutex_off(void)
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{
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if (usunsetlock(uslock) == -1) {
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perror("usunsetlock");
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clean_child_exit(APEXIT_CHILDFATAL);
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}
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}
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#elif defined (USE_PTHREAD_SERIALIZED_ACCEPT)
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/* This code probably only works on Solaris ... but it works really fast
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* on Solaris. Note that pthread mutexes are *NOT* released when a task
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* dies ... the task has to free it itself. So we block signals and
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* try to be nice about releasing the mutex.
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*/
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#include <pthread.h>
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static pthread_mutex_t *accept_mutex = (void *)(caddr_t) -1;
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static int have_accept_mutex;
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static sigset_t accept_block_mask;
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static sigset_t accept_previous_mask;
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static void accept_mutex_child_cleanup(void *foo)
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{
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if (accept_mutex != (void *)(caddr_t)-1
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&& have_accept_mutex) {
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pthread_mutex_unlock(accept_mutex);
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}
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}
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static void accept_mutex_child_init(pool *p)
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{
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ap_register_cleanup(p, NULL, accept_mutex_child_cleanup, ap_null_cleanup);
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}
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static void accept_mutex_cleanup(void *foo)
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{
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if (accept_mutex != (void *)(caddr_t)-1
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&& munmap((caddr_t) accept_mutex, sizeof(*accept_mutex))) {
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perror("munmap");
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}
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accept_mutex = (void *)(caddr_t)-1;
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}
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static void accept_mutex_init(pool *p)
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{
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pthread_mutexattr_t mattr;
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int fd;
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fd = open("/dev/zero", O_RDWR);
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if (fd == -1) {
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perror("open(/dev/zero)");
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exit(APEXIT_INIT);
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}
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accept_mutex = (pthread_mutex_t *) mmap((caddr_t) 0, sizeof(*accept_mutex),
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PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
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if (accept_mutex == (void *) (caddr_t) - 1) {
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perror("mmap");
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exit(APEXIT_INIT);
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}
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close(fd);
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if ((errno = pthread_mutexattr_init(&mattr))) {
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perror("pthread_mutexattr_init");
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exit(APEXIT_INIT);
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}
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if ((errno = pthread_mutexattr_setpshared(&mattr,
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PTHREAD_PROCESS_SHARED))) {
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perror("pthread_mutexattr_setpshared");
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exit(APEXIT_INIT);
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}
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if ((errno = pthread_mutex_init(accept_mutex, &mattr))) {
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perror("pthread_mutex_init");
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exit(APEXIT_INIT);
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}
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sigfillset(&accept_block_mask);
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sigdelset(&accept_block_mask, SIGHUP);
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sigdelset(&accept_block_mask, SIGTERM);
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sigdelset(&accept_block_mask, SIGUSR1);
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ap_register_cleanup(p, NULL, accept_mutex_cleanup, ap_null_cleanup);
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}
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static void accept_mutex_on(void)
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{
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int err;
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if (sigprocmask(SIG_BLOCK, &accept_block_mask, &accept_previous_mask)) {
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perror("sigprocmask(SIG_BLOCK)");
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clean_child_exit(APEXIT_CHILDFATAL);
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}
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if ((err = pthread_mutex_lock(accept_mutex))) {
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errno = err;
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perror("pthread_mutex_lock");
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clean_child_exit(APEXIT_CHILDFATAL);
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}
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have_accept_mutex = 1;
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}
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static void accept_mutex_off(void)
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{
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int err;
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if ((err = pthread_mutex_unlock(accept_mutex))) {
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errno = err;
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perror("pthread_mutex_unlock");
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clean_child_exit(APEXIT_CHILDFATAL);
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}
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/* There is a slight race condition right here... if we were to die right
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* now, we'd do another pthread_mutex_unlock. Now, doing that would let
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* another process into the mutex. pthread mutexes are designed to be
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* fast, as such they don't have protection for things like testing if the
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* thread owning a mutex is actually unlocking it (or even any way of
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* testing who owns the mutex).
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*
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* If we were to unset have_accept_mutex prior to releasing the mutex
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* then the race could result in the server unable to serve hits. Doing
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* it this way means that the server can continue, but an additional
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* child might be in the critical section ... at least it's still serving
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* hits.
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*/
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have_accept_mutex = 0;
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if (sigprocmask(SIG_SETMASK, &accept_previous_mask, NULL)) {
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perror("sigprocmask(SIG_SETMASK)");
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clean_child_exit(1);
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}
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}
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#elif defined (USE_SYSVSEM_SERIALIZED_ACCEPT)
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#include <sys/types.h>
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#include <sys/ipc.h>
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#include <sys/sem.h>
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#ifdef NEED_UNION_SEMUN
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/* it makes no sense, but this isn't defined on solaris */
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union semun {
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long val;
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struct semid_ds *buf;
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ushort *array;
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};
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#endif
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static int sem_id = -1;
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static struct sembuf op_on;
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static struct sembuf op_off;
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/* We get a random semaphore ... the lame sysv semaphore interface
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* means we have to be sure to clean this up or else we'll leak
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* semaphores.
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*/
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static void accept_mutex_cleanup(void *foo)
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{
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union semun ick;
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if (sem_id < 0)
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return;
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/* this is ignored anyhow */
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ick.val = 0;
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semctl(sem_id, 0, IPC_RMID, ick);
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}
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#define accept_mutex_child_init(x)
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static void accept_mutex_init(pool *p)
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{
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union semun ick;
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struct semid_ds buf;
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/* acquire the semaphore */
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sem_id = semget(IPC_PRIVATE, 1, IPC_CREAT | 0600);
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if (sem_id < 0) {
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perror("semget");
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exit(APEXIT_INIT);
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}
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ick.val = 1;
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if (semctl(sem_id, 0, SETVAL, ick) < 0) {
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perror("semctl(SETVAL)");
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exit(APEXIT_INIT);
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}
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|
if (!getuid()) {
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/* restrict it to use only by the appropriate user_id ... not that this
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|
* stops CGIs from acquiring it and dinking around with it.
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|
*/
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buf.sem_perm.uid = unixd_config.user_id;
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buf.sem_perm.gid = unixd_config.group_id;
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buf.sem_perm.mode = 0600;
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ick.buf = &buf;
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if (semctl(sem_id, 0, IPC_SET, ick) < 0) {
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perror("semctl(IPC_SET)");
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exit(APEXIT_INIT);
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}
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}
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ap_register_cleanup(p, NULL, accept_mutex_cleanup, ap_null_cleanup);
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/* pre-initialize these */
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op_on.sem_num = 0;
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op_on.sem_op = -1;
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op_on.sem_flg = SEM_UNDO;
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op_off.sem_num = 0;
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op_off.sem_op = 1;
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op_off.sem_flg = SEM_UNDO;
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}
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|
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static void accept_mutex_on(void)
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{
|
|
while (semop(sem_id, &op_on, 1) < 0) {
|
|
if (errno != EINTR) {
|
|
perror("accept_mutex_on");
|
|
clean_child_exit(APEXIT_CHILDFATAL);
|
|
}
|
|
}
|
|
}
|
|
|
|
static void accept_mutex_off(void)
|
|
{
|
|
while (semop(sem_id, &op_off, 1) < 0) {
|
|
if (errno != EINTR) {
|
|
perror("accept_mutex_off");
|
|
clean_child_exit(APEXIT_CHILDFATAL);
|
|
}
|
|
}
|
|
}
|
|
|
|
#elif defined(USE_FCNTL_SERIALIZED_ACCEPT)
|
|
static struct flock lock_it;
|
|
static struct flock unlock_it;
|
|
|
|
static int lock_fd = -1;
|
|
|
|
#define accept_mutex_child_init(x)
|
|
|
|
/*
|
|
* Initialize mutex lock.
|
|
* Must be safe to call this on a restart.
|
|
*/
|
|
static void accept_mutex_init(pool *p)
|
|
{
|
|
|
|
lock_it.l_whence = SEEK_SET; /* from current point */
|
|
lock_it.l_start = 0; /* -"- */
|
|
lock_it.l_len = 0; /* until end of file */
|
|
lock_it.l_type = F_WRLCK; /* set exclusive/write lock */
|
|
lock_it.l_pid = 0; /* pid not actually interesting */
|
|
unlock_it.l_whence = SEEK_SET; /* from current point */
|
|
unlock_it.l_start = 0; /* -"- */
|
|
unlock_it.l_len = 0; /* until end of file */
|
|
unlock_it.l_type = F_UNLCK; /* set exclusive/write lock */
|
|
unlock_it.l_pid = 0; /* pid not actually interesting */
|
|
|
|
expand_lock_fname(p);
|
|
lock_fd = ap_popenf(p, ap_lock_fname, O_CREAT | O_WRONLY | O_EXCL, 0644);
|
|
if (lock_fd == -1) {
|
|
perror("open");
|
|
fprintf(stderr, "Cannot open lock file: %s\n", ap_lock_fname);
|
|
exit(APEXIT_INIT);
|
|
}
|
|
unlink(ap_lock_fname);
|
|
}
|
|
|
|
static void accept_mutex_on(void)
|
|
{
|
|
int ret;
|
|
|
|
while ((ret = fcntl(lock_fd, F_SETLKW, &lock_it)) < 0 && errno == EINTR) {
|
|
/* nop */
|
|
}
|
|
|
|
if (ret < 0) {
|
|
ap_log_error(APLOG_MARK, APLOG_EMERG, server_conf,
|
|
"fcntl: F_SETLKW: Error getting accept lock, exiting! "
|
|
"Perhaps you need to use the LockFile directive to place "
|
|
"your lock file on a local disk!");
|
|
clean_child_exit(APEXIT_CHILDFATAL);
|
|
}
|
|
}
|
|
|
|
static void accept_mutex_off(void)
|
|
{
|
|
int ret;
|
|
|
|
while ((ret = fcntl(lock_fd, F_SETLKW, &unlock_it)) < 0 && errno == EINTR) {
|
|
/* nop */
|
|
}
|
|
if (ret < 0) {
|
|
ap_log_error(APLOG_MARK, APLOG_EMERG, server_conf,
|
|
"fcntl: F_SETLKW: Error freeing accept lock, exiting! "
|
|
"Perhaps you need to use the LockFile directive to place "
|
|
"your lock file on a local disk!");
|
|
clean_child_exit(APEXIT_CHILDFATAL);
|
|
}
|
|
}
|
|
|
|
#elif defined(USE_FLOCK_SERIALIZED_ACCEPT)
|
|
|
|
static int lock_fd = -1;
|
|
|
|
static void accept_mutex_cleanup(void *foo)
|
|
{
|
|
unlink(ap_lock_fname);
|
|
}
|
|
|
|
/*
|
|
* Initialize mutex lock.
|
|
* Done by each child at it's birth
|
|
*/
|
|
static void accept_mutex_child_init(pool *p)
|
|
{
|
|
|
|
lock_fd = ap_popenf(p, ap_lock_fname, O_WRONLY, 0600);
|
|
if (lock_fd == -1) {
|
|
ap_log_error(APLOG_MARK, APLOG_EMERG, server_conf,
|
|
"Child cannot open lock file: %s", ap_lock_fname);
|
|
clean_child_exit(APEXIT_CHILDINIT);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Initialize mutex lock.
|
|
* Must be safe to call this on a restart.
|
|
*/
|
|
static void accept_mutex_init(pool *p)
|
|
{
|
|
expand_lock_fname(p);
|
|
unlink(ap_lock_fname);
|
|
lock_fd = ap_popenf(p, ap_lock_fname, O_CREAT | O_WRONLY | O_EXCL, 0600);
|
|
if (lock_fd == -1) {
|
|
ap_log_error(APLOG_MARK, APLOG_EMERG, server_conf,
|
|
"Parent cannot open lock file: %s", ap_lock_fname);
|
|
exit(APEXIT_INIT);
|
|
}
|
|
ap_register_cleanup(p, NULL, accept_mutex_cleanup, ap_null_cleanup);
|
|
}
|
|
|
|
static void accept_mutex_on(void)
|
|
{
|
|
int ret;
|
|
|
|
while ((ret = flock(lock_fd, LOCK_EX)) < 0 && errno == EINTR)
|
|
continue;
|
|
|
|
if (ret < 0) {
|
|
ap_log_error(APLOG_MARK, APLOG_EMERG, server_conf,
|
|
"flock: LOCK_EX: Error getting accept lock. Exiting!");
|
|
clean_child_exit(APEXIT_CHILDFATAL);
|
|
}
|
|
}
|
|
|
|
static void accept_mutex_off(void)
|
|
{
|
|
if (flock(lock_fd, LOCK_UN) < 0) {
|
|
ap_log_error(APLOG_MARK, APLOG_EMERG, server_conf,
|
|
"flock: LOCK_UN: Error freeing accept lock. Exiting!");
|
|
clean_child_exit(APEXIT_CHILDFATAL);
|
|
}
|
|
}
|
|
|
|
#elif defined(USE_OS2SEM_SERIALIZED_ACCEPT)
|
|
|
|
static HMTX lock_sem = -1;
|
|
|
|
static void accept_mutex_cleanup(void *foo)
|
|
{
|
|
DosReleaseMutexSem(lock_sem);
|
|
DosCloseMutexSem(lock_sem);
|
|
}
|
|
|
|
/*
|
|
* Initialize mutex lock.
|
|
* Done by each child at it's birth
|
|
*/
|
|
static void accept_mutex_child_init(pool *p)
|
|
{
|
|
int rc = DosOpenMutexSem(NULL, &lock_sem);
|
|
|
|
if (rc != 0) {
|
|
ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_EMERG, server_conf,
|
|
"Child cannot open lock semaphore, rc=%d", rc);
|
|
clean_child_exit(APEXIT_CHILDINIT);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Initialize mutex lock.
|
|
* Must be safe to call this on a restart.
|
|
*/
|
|
static void accept_mutex_init(pool *p)
|
|
{
|
|
int rc = DosCreateMutexSem(NULL, &lock_sem, DC_SEM_SHARED, FALSE);
|
|
|
|
if (rc != 0) {
|
|
ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_EMERG, server_conf,
|
|
"Parent cannot create lock semaphore, rc=%d", rc);
|
|
exit(APEXIT_INIT);
|
|
}
|
|
|
|
ap_register_cleanup(p, NULL, accept_mutex_cleanup, ap_null_cleanup);
|
|
}
|
|
|
|
static void accept_mutex_on(void)
|
|
{
|
|
int rc = DosRequestMutexSem(lock_sem, SEM_INDEFINITE_WAIT);
|
|
|
|
if (rc != 0) {
|
|
ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_EMERG, server_conf,
|
|
"OS2SEM: Error %d getting accept lock. Exiting!", rc);
|
|
clean_child_exit(APEXIT_CHILDFATAL);
|
|
}
|
|
}
|
|
|
|
static void accept_mutex_off(void)
|
|
{
|
|
int rc = DosReleaseMutexSem(lock_sem);
|
|
|
|
if (rc != 0) {
|
|
ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_EMERG, server_conf,
|
|
"OS2SEM: Error %d freeing accept lock. Exiting!", rc);
|
|
clean_child_exit(APEXIT_CHILDFATAL);
|
|
}
|
|
}
|
|
|
|
#elif defined(USE_TPF_CORE_SERIALIZED_ACCEPT)
|
|
|
|
static int tpf_core_held;
|
|
|
|
static void accept_mutex_cleanup(void *foo)
|
|
{
|
|
if(tpf_core_held)
|
|
coruc(RESOURCE_KEY);
|
|
}
|
|
|
|
#define accept_mutex_init(x)
|
|
|
|
static void accept_mutex_child_init(pool *p)
|
|
{
|
|
ap_register_cleanup(p, NULL, accept_mutex_cleanup, ap_null_cleanup);
|
|
tpf_core_held = 0;
|
|
}
|
|
|
|
static void accept_mutex_on(void)
|
|
{
|
|
corhc(RESOURCE_KEY);
|
|
tpf_core_held = 1;
|
|
ap_check_signals();
|
|
}
|
|
|
|
static void accept_mutex_off(void)
|
|
{
|
|
coruc(RESOURCE_KEY);
|
|
tpf_core_held = 0;
|
|
ap_check_signals();
|
|
}
|
|
|
|
#else
|
|
/* Default --- no serialization. Other methods *could* go here,
|
|
* as #elifs...
|
|
*/
|
|
#if !defined(MULTITHREAD)
|
|
/* Multithreaded systems don't complete between processes for
|
|
* the sockets. */
|
|
#define NO_SERIALIZED_ACCEPT
|
|
#define accept_mutex_child_init(x)
|
|
#define accept_mutex_init(x)
|
|
#define accept_mutex_on()
|
|
#define accept_mutex_off()
|
|
#endif
|
|
#endif
|
|
|
|
/* On some architectures it's safe to do unserialized accept()s in the single
|
|
* Listen case. But it's never safe to do it in the case where there's
|
|
* multiple Listen statements. Define SINGLE_LISTEN_UNSERIALIZED_ACCEPT
|
|
* when it's safe in the single Listen case.
|
|
*/
|
|
#ifdef SINGLE_LISTEN_UNSERIALIZED_ACCEPT
|
|
#define SAFE_ACCEPT(stmt) do {if (ap_listeners->next) {stmt;}} while(0)
|
|
#else
|
|
#define SAFE_ACCEPT(stmt) do {stmt;} while(0)
|
|
#endif
|
|
|
|
|
|
/*****************************************************************
|
|
* dealing with other children
|
|
*/
|
|
|
|
#ifdef HAS_OTHER_CHILD
|
|
API_EXPORT(void) ap_register_other_child(int pid,
|
|
void (*maintenance) (int reason, void *, ap_wait_t status),
|
|
void *data, int write_fd)
|
|
{
|
|
other_child_rec *ocr;
|
|
|
|
ocr = ap_palloc(pconf, sizeof(*ocr));
|
|
ocr->pid = pid;
|
|
ocr->maintenance = maintenance;
|
|
ocr->data = data;
|
|
ocr->write_fd = write_fd;
|
|
ocr->next = other_children;
|
|
other_children = ocr;
|
|
}
|
|
|
|
/* note that since this can be called by a maintenance function while we're
|
|
* scanning the other_children list, all scanners should protect themself
|
|
* by loading ocr->next before calling any maintenance function.
|
|
*/
|
|
API_EXPORT(void) ap_unregister_other_child(void *data)
|
|
{
|
|
other_child_rec **pocr, *nocr;
|
|
|
|
for (pocr = &other_children; *pocr; pocr = &(*pocr)->next) {
|
|
if ((*pocr)->data == data) {
|
|
nocr = (*pocr)->next;
|
|
(*(*pocr)->maintenance) (OC_REASON_UNREGISTER, (*pocr)->data, -1);
|
|
*pocr = nocr;
|
|
/* XXX: um, well we've just wasted some space in pconf ? */
|
|
return;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* test to ensure that the write_fds are all still writable, otherwise
|
|
* invoke the maintenance functions as appropriate */
|
|
static void probe_writable_fds(void)
|
|
{
|
|
fd_set writable_fds;
|
|
int fd_max;
|
|
other_child_rec *ocr, *nocr;
|
|
struct timeval tv;
|
|
int rc;
|
|
|
|
if (other_children == NULL)
|
|
return;
|
|
|
|
fd_max = 0;
|
|
FD_ZERO(&writable_fds);
|
|
do {
|
|
for (ocr = other_children; ocr; ocr = ocr->next) {
|
|
if (ocr->write_fd == -1)
|
|
continue;
|
|
FD_SET(ocr->write_fd, &writable_fds);
|
|
if (ocr->write_fd > fd_max) {
|
|
fd_max = ocr->write_fd;
|
|
}
|
|
}
|
|
if (fd_max == 0)
|
|
return;
|
|
|
|
tv.tv_sec = 0;
|
|
tv.tv_usec = 0;
|
|
rc = ap_select(fd_max + 1, NULL, &writable_fds, NULL, &tv);
|
|
} while (rc == -1 && errno == EINTR);
|
|
|
|
if (rc == -1) {
|
|
/* XXX: uhh this could be really bad, we could have a bad file
|
|
* descriptor due to a bug in one of the maintenance routines */
|
|
ap_log_unixerr("probe_writable_fds", "select",
|
|
"could not probe writable fds", server_conf);
|
|
return;
|
|
}
|
|
if (rc == 0)
|
|
return;
|
|
|
|
for (ocr = other_children; ocr; ocr = nocr) {
|
|
nocr = ocr->next;
|
|
if (ocr->write_fd == -1)
|
|
continue;
|
|
if (FD_ISSET(ocr->write_fd, &writable_fds))
|
|
continue;
|
|
(*ocr->maintenance) (OC_REASON_UNWRITABLE, ocr->data, -1);
|
|
}
|
|
}
|
|
|
|
/* possibly reap an other_child, return 0 if yes, -1 if not */
|
|
static int reap_other_child(int pid, ap_wait_t status)
|
|
{
|
|
other_child_rec *ocr, *nocr;
|
|
|
|
for (ocr = other_children; ocr; ocr = nocr) {
|
|
nocr = ocr->next;
|
|
if (ocr->pid != pid)
|
|
continue;
|
|
ocr->pid = -1;
|
|
(*ocr->maintenance) (OC_REASON_DEATH, ocr->data, status);
|
|
return 0;
|
|
}
|
|
return -1;
|
|
}
|
|
#endif
|
|
|
|
/*****************************************************************
|
|
*
|
|
* Dealing with the scoreboard... a lot of these variables are global
|
|
* only to avoid getting clobbered by the longjmp() that happens when
|
|
* a hard timeout expires...
|
|
*
|
|
* We begin with routines which deal with the file itself...
|
|
*/
|
|
|
|
#if defined(USE_OS2_SCOREBOARD)
|
|
|
|
/* The next two routines are used to access shared memory under OS/2. */
|
|
/* This requires EMX v09c to be installed. */
|
|
|
|
caddr_t create_shared_heap(const char *name, size_t size)
|
|
{
|
|
ULONG rc;
|
|
void *mem;
|
|
Heap_t h;
|
|
|
|
rc = DosAllocSharedMem(&mem, name, size,
|
|
PAG_COMMIT | PAG_READ | PAG_WRITE);
|
|
if (rc != 0)
|
|
return NULL;
|
|
h = _ucreate(mem, size, !_BLOCK_CLEAN, _HEAP_REGULAR | _HEAP_SHARED,
|
|
NULL, NULL);
|
|
if (h == NULL)
|
|
DosFreeMem(mem);
|
|
return (caddr_t) h;
|
|
}
|
|
|
|
caddr_t get_shared_heap(const char *Name)
|
|
{
|
|
|
|
PVOID BaseAddress; /* Pointer to the base address of
|
|
the shared memory object */
|
|
ULONG AttributeFlags; /* Flags describing characteristics
|
|
of the shared memory object */
|
|
APIRET rc; /* Return code */
|
|
|
|
/* Request read and write access to */
|
|
/* the shared memory object */
|
|
AttributeFlags = PAG_WRITE | PAG_READ;
|
|
|
|
rc = DosGetNamedSharedMem(&BaseAddress, Name, AttributeFlags);
|
|
|
|
if (rc != 0) {
|
|
printf("DosGetNamedSharedMem error: return code = %ld", rc);
|
|
return 0;
|
|
}
|
|
|
|
return BaseAddress;
|
|
}
|
|
|
|
static void setup_shared_mem(pool *p)
|
|
{
|
|
caddr_t m;
|
|
|
|
int rc;
|
|
|
|
m = (caddr_t) create_shared_heap("\\SHAREMEM\\SCOREBOARD", SCOREBOARD_SIZE);
|
|
if (m == 0) {
|
|
fprintf(stderr, "%s: Could not create OS/2 Shared memory pool.\n",
|
|
ap_server_argv0);
|
|
exit(APEXIT_INIT);
|
|
}
|
|
|
|
rc = _uopen((Heap_t) m);
|
|
if (rc != 0) {
|
|
fprintf(stderr,
|
|
"%s: Could not uopen() newly created OS/2 Shared memory pool.\n",
|
|
ap_server_argv0);
|
|
}
|
|
ap_scoreboard_image = (scoreboard *) m;
|
|
ap_scoreboard_image->global.running_generation = 0;
|
|
}
|
|
|
|
static void reopen_scoreboard(pool *p)
|
|
{
|
|
caddr_t m;
|
|
int rc;
|
|
|
|
m = (caddr_t) get_shared_heap("\\SHAREMEM\\SCOREBOARD");
|
|
if (m == 0) {
|
|
fprintf(stderr, "%s: Could not find existing OS/2 Shared memory pool.\n",
|
|
ap_server_argv0);
|
|
exit(APEXIT_INIT);
|
|
}
|
|
|
|
rc = _uopen((Heap_t) m);
|
|
ap_scoreboard_image = (scoreboard *) m;
|
|
}
|
|
|
|
#elif defined(USE_POSIX_SCOREBOARD)
|
|
#include <sys/mman.h>
|
|
/*
|
|
* POSIX 1003.4 style
|
|
*
|
|
* Note 1:
|
|
* As of version 4.23A, shared memory in QNX must reside under /dev/shmem,
|
|
* where no subdirectories allowed.
|
|
*
|
|
* POSIX shm_open() and shm_unlink() will take care about this issue,
|
|
* but to avoid confusion, I suggest to redefine scoreboard file name
|
|
* in httpd.conf to cut "logs/" from it. With default setup actual name
|
|
* will be "/dev/shmem/logs.apache_status".
|
|
*
|
|
* If something went wrong and Apache did not unlinked this object upon
|
|
* exit, you can remove it manually, using "rm -f" command.
|
|
*
|
|
* Note 2:
|
|
* <sys/mman.h> in QNX defines MAP_ANON, but current implementation
|
|
* does NOT support BSD style anonymous mapping. So, the order of
|
|
* conditional compilation is important:
|
|
* this #ifdef section must be ABOVE the next one (BSD style).
|
|
*
|
|
* I tested this stuff and it works fine for me, but if it provides
|
|
* trouble for you, just comment out USE_MMAP_SCOREBOARD in QNX section
|
|
* of ap_config.h
|
|
*
|
|
* June 5, 1997,
|
|
* Igor N. Kovalenko -- infoh@mail.wplus.net
|
|
*/
|
|
|
|
static void cleanup_shared_mem(void *d)
|
|
{
|
|
shm_unlink(ap_scoreboard_fname);
|
|
}
|
|
|
|
static void setup_shared_mem(pool *p)
|
|
{
|
|
char buf[512];
|
|
caddr_t m;
|
|
int fd;
|
|
|
|
fd = shm_open(ap_scoreboard_fname, O_RDWR | O_CREAT, S_IRUSR | S_IWUSR);
|
|
if (fd == -1) {
|
|
ap_snprintf(buf, sizeof(buf), "%s: could not open(create) scoreboard",
|
|
ap_server_argv0);
|
|
perror(buf);
|
|
exit(APEXIT_INIT);
|
|
}
|
|
if (ltrunc(fd, (off_t) SCOREBOARD_SIZE, SEEK_SET) == -1) {
|
|
ap_snprintf(buf, sizeof(buf), "%s: could not ltrunc scoreboard",
|
|
ap_server_argv0);
|
|
perror(buf);
|
|
shm_unlink(ap_scoreboard_fname);
|
|
exit(APEXIT_INIT);
|
|
}
|
|
if ((m = (caddr_t) mmap((caddr_t) 0,
|
|
(size_t) SCOREBOARD_SIZE, PROT_READ | PROT_WRITE,
|
|
MAP_SHARED, fd, (off_t) 0)) == (caddr_t) - 1) {
|
|
ap_snprintf(buf, sizeof(buf), "%s: cannot mmap scoreboard",
|
|
ap_server_argv0);
|
|
perror(buf);
|
|
shm_unlink(ap_scoreboard_fname);
|
|
exit(APEXIT_INIT);
|
|
}
|
|
close(fd);
|
|
ap_register_cleanup(p, NULL, cleanup_shared_mem, ap_null_cleanup);
|
|
ap_scoreboard_image = (scoreboard *) m;
|
|
ap_scoreboard_image->global.running_generation = 0;
|
|
}
|
|
|
|
static void reopen_scoreboard(pool *p)
|
|
{
|
|
}
|
|
|
|
#elif defined(USE_MMAP_SCOREBOARD)
|
|
|
|
static void setup_shared_mem(pool *p)
|
|
{
|
|
caddr_t m;
|
|
|
|
#if defined(MAP_ANON)
|
|
/* BSD style */
|
|
#ifdef CONVEXOS11
|
|
/*
|
|
* 9-Aug-97 - Jeff Venters (venters@convex.hp.com)
|
|
* ConvexOS maps address space as follows:
|
|
* 0x00000000 - 0x7fffffff : Kernel
|
|
* 0x80000000 - 0xffffffff : User
|
|
* Start mmapped area 1GB above start of text.
|
|
*
|
|
* Also, the length requires a pointer as the actual length is
|
|
* returned (rounded up to a page boundary).
|
|
*/
|
|
{
|
|
unsigned len = SCOREBOARD_SIZE;
|
|
|
|
m = mmap((caddr_t) 0xC0000000, &len,
|
|
PROT_READ | PROT_WRITE, MAP_ANON | MAP_SHARED, NOFD, 0);
|
|
}
|
|
#elif defined(MAP_TMPFILE)
|
|
{
|
|
char mfile[] = "/tmp/apache_shmem_XXXX";
|
|
int fd = mkstemp(mfile);
|
|
if (fd == -1) {
|
|
perror("open");
|
|
fprintf(stderr, "%s: Could not open %s\n", ap_server_argv0, mfile);
|
|
exit(APEXIT_INIT);
|
|
}
|
|
m = mmap((caddr_t) 0, SCOREBOARD_SIZE,
|
|
PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
|
|
if (m == (caddr_t) - 1) {
|
|
perror("mmap");
|
|
fprintf(stderr, "%s: Could not mmap %s\n", ap_server_argv0, mfile);
|
|
exit(APEXIT_INIT);
|
|
}
|
|
close(fd);
|
|
unlink(mfile);
|
|
}
|
|
#else
|
|
m = mmap((caddr_t) 0, SCOREBOARD_SIZE,
|
|
PROT_READ | PROT_WRITE, MAP_ANON | MAP_SHARED, -1, 0);
|
|
#endif
|
|
if (m == (caddr_t) - 1) {
|
|
perror("mmap");
|
|
fprintf(stderr, "%s: Could not mmap memory\n", ap_server_argv0);
|
|
exit(APEXIT_INIT);
|
|
}
|
|
#else
|
|
/* Sun style */
|
|
int fd;
|
|
|
|
fd = open("/dev/zero", O_RDWR);
|
|
if (fd == -1) {
|
|
perror("open");
|
|
fprintf(stderr, "%s: Could not open /dev/zero\n", ap_server_argv0);
|
|
exit(APEXIT_INIT);
|
|
}
|
|
m = mmap((caddr_t) 0, SCOREBOARD_SIZE,
|
|
PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
|
|
if (m == (caddr_t) - 1) {
|
|
perror("mmap");
|
|
fprintf(stderr, "%s: Could not mmap /dev/zero\n", ap_server_argv0);
|
|
exit(APEXIT_INIT);
|
|
}
|
|
close(fd);
|
|
#endif
|
|
ap_scoreboard_image = (scoreboard *) m;
|
|
ap_scoreboard_image->global.running_generation = 0;
|
|
}
|
|
|
|
static void reopen_scoreboard(pool *p)
|
|
{
|
|
}
|
|
|
|
#elif defined(USE_SHMGET_SCOREBOARD)
|
|
static key_t shmkey = IPC_PRIVATE;
|
|
static int shmid = -1;
|
|
|
|
static void setup_shared_mem(pool *p)
|
|
{
|
|
struct shmid_ds shmbuf;
|
|
#ifdef MOVEBREAK
|
|
char *obrk;
|
|
#endif
|
|
|
|
if ((shmid = shmget(shmkey, SCOREBOARD_SIZE, IPC_CREAT | SHM_R | SHM_W)) == -1) {
|
|
#ifdef LINUX
|
|
if (errno == ENOSYS) {
|
|
ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_EMERG, server_conf,
|
|
"Your kernel was built without CONFIG_SYSVIPC\n"
|
|
"%s: Please consult the Apache FAQ for details",
|
|
ap_server_argv0);
|
|
}
|
|
#endif
|
|
ap_log_error(APLOG_MARK, APLOG_EMERG, server_conf,
|
|
"could not call shmget");
|
|
exit(APEXIT_INIT);
|
|
}
|
|
|
|
ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_INFO, server_conf,
|
|
"created shared memory segment #%d", shmid);
|
|
|
|
#ifdef MOVEBREAK
|
|
/*
|
|
* Some SysV systems place the shared segment WAY too close
|
|
* to the dynamic memory break point (sbrk(0)). This severely
|
|
* limits the use of malloc/sbrk in the program since sbrk will
|
|
* refuse to move past that point.
|
|
*
|
|
* To get around this, we move the break point "way up there",
|
|
* attach the segment and then move break back down. Ugly
|
|
*/
|
|
if ((obrk = sbrk(MOVEBREAK)) == (char *) -1) {
|
|
ap_log_error(APLOG_MARK, APLOG_ERR, server_conf,
|
|
"sbrk() could not move break");
|
|
}
|
|
#endif
|
|
|
|
#define BADSHMAT ((scoreboard *)(-1))
|
|
if ((ap_scoreboard_image = (scoreboard *) shmat(shmid, 0, 0)) == BADSHMAT) {
|
|
ap_log_error(APLOG_MARK, APLOG_EMERG, server_conf, "shmat error");
|
|
/*
|
|
* We exit below, after we try to remove the segment
|
|
*/
|
|
}
|
|
else { /* only worry about permissions if we attached the segment */
|
|
if (shmctl(shmid, IPC_STAT, &shmbuf) != 0) {
|
|
ap_log_error(APLOG_MARK, APLOG_ERR, server_conf,
|
|
"shmctl() could not stat segment #%d", shmid);
|
|
}
|
|
else {
|
|
shmbuf.shm_perm.uid = unixd_config.user_id;
|
|
shmbuf.shm_perm.gid = unixd_config.group_id;
|
|
if (shmctl(shmid, IPC_SET, &shmbuf) != 0) {
|
|
ap_log_error(APLOG_MARK, APLOG_ERR, server_conf,
|
|
"shmctl() could not set segment #%d", shmid);
|
|
}
|
|
}
|
|
}
|
|
/*
|
|
* We must avoid leaving segments in the kernel's
|
|
* (small) tables.
|
|
*/
|
|
if (shmctl(shmid, IPC_RMID, NULL) != 0) {
|
|
ap_log_error(APLOG_MARK, APLOG_WARNING, server_conf,
|
|
"shmctl: IPC_RMID: could not remove shared memory segment #%d",
|
|
shmid);
|
|
}
|
|
if (ap_scoreboard_image == BADSHMAT) /* now bailout */
|
|
exit(APEXIT_INIT);
|
|
|
|
#ifdef MOVEBREAK
|
|
if (obrk == (char *) -1)
|
|
return; /* nothing else to do */
|
|
if (sbrk(-(MOVEBREAK)) == (char *) -1) {
|
|
ap_log_error(APLOG_MARK, APLOG_ERR, server_conf,
|
|
"sbrk() could not move break back");
|
|
}
|
|
#endif
|
|
ap_scoreboard_image->global.running_generation = 0;
|
|
}
|
|
|
|
static void reopen_scoreboard(pool *p)
|
|
{
|
|
}
|
|
|
|
#elif defined(USE_TPF_SCOREBOARD)
|
|
|
|
static void cleanup_scoreboard_heap()
|
|
{
|
|
int rv;
|
|
rv = rsysc(ap_scoreboard_image, SCOREBOARD_FRAMES, SCOREBOARD_NAME);
|
|
if(rv == RSYSC_ERROR) {
|
|
ap_log_error(APLOG_MARK, APLOG_ERR, server_conf,
|
|
"rsysc() could not release scoreboard system heap");
|
|
}
|
|
}
|
|
|
|
static void setup_shared_mem(pool *p)
|
|
{
|
|
cinfc(CINFC_WRITE, CINFC_CMMCTK2);
|
|
ap_scoreboard_image = (scoreboard *) gsysc(SCOREBOARD_FRAMES, SCOREBOARD_NAME);
|
|
|
|
if (!ap_scoreboard_image) {
|
|
fprintf(stderr, "httpd: Could not create scoreboard system heap storage.\n");
|
|
exit(APEXIT_INIT);
|
|
}
|
|
|
|
ap_register_cleanup(p, NULL, cleanup_scoreboard_heap, ap_null_cleanup);
|
|
ap_scoreboard_image->global.running_generation = 0;
|
|
}
|
|
|
|
static void reopen_scoreboard(pool *p)
|
|
{
|
|
cinfc(CINFC_WRITE, CINFC_CMMCTK2);
|
|
}
|
|
|
|
#else
|
|
#define SCOREBOARD_FILE
|
|
static scoreboard _scoreboard_image;
|
|
static int scoreboard_fd = -1;
|
|
|
|
/* XXX: things are seriously screwed if we ever have to do a partial
|
|
* read or write ... we could get a corrupted scoreboard
|
|
*/
|
|
static int force_write(int fd, void *buffer, int bufsz)
|
|
{
|
|
int rv, orig_sz = bufsz;
|
|
|
|
do {
|
|
rv = write(fd, buffer, bufsz);
|
|
if (rv > 0) {
|
|
buffer = (char *) buffer + rv;
|
|
bufsz -= rv;
|
|
}
|
|
} while ((rv > 0 && bufsz > 0) || (rv == -1 && errno == EINTR));
|
|
|
|
return rv < 0 ? rv : orig_sz - bufsz;
|
|
}
|
|
|
|
static int force_read(int fd, void *buffer, int bufsz)
|
|
{
|
|
int rv, orig_sz = bufsz;
|
|
|
|
do {
|
|
rv = read(fd, buffer, bufsz);
|
|
if (rv > 0) {
|
|
buffer = (char *) buffer + rv;
|
|
bufsz -= rv;
|
|
}
|
|
} while ((rv > 0 && bufsz > 0) || (rv == -1 && errno == EINTR));
|
|
|
|
return rv < 0 ? rv : orig_sz - bufsz;
|
|
}
|
|
|
|
static void cleanup_scoreboard_file(void *foo)
|
|
{
|
|
unlink(ap_scoreboard_fname);
|
|
}
|
|
|
|
void reopen_scoreboard(pool *p)
|
|
{
|
|
if (scoreboard_fd != -1)
|
|
ap_pclosef(p, scoreboard_fd);
|
|
|
|
#ifdef TPF
|
|
ap_scoreboard_fname = ap_server_root_relative(p, ap_scoreboard_fname);
|
|
#endif /* TPF */
|
|
scoreboard_fd = ap_popenf(p, ap_scoreboard_fname, O_CREAT | O_BINARY | O_RDWR, 0666);
|
|
if (scoreboard_fd == -1) {
|
|
perror(ap_scoreboard_fname);
|
|
fprintf(stderr, "Cannot open scoreboard file:\n");
|
|
clean_child_exit(1);
|
|
}
|
|
}
|
|
#endif
|
|
|
|
/* Called by parent process */
|
|
static void reinit_scoreboard(pool *p)
|
|
{
|
|
int running_gen = 0;
|
|
if (ap_scoreboard_image)
|
|
running_gen = ap_scoreboard_image->global.running_generation;
|
|
|
|
#ifndef SCOREBOARD_FILE
|
|
if (ap_scoreboard_image == NULL) {
|
|
setup_shared_mem(p);
|
|
}
|
|
memset(ap_scoreboard_image, 0, SCOREBOARD_SIZE);
|
|
ap_scoreboard_image->global.running_generation = running_gen;
|
|
#else
|
|
ap_scoreboard_image = &_scoreboard_image;
|
|
ap_scoreboard_fname = ap_server_root_relative(p, ap_scoreboard_fname);
|
|
|
|
scoreboard_fd = ap_popenf(p, ap_scoreboard_fname, O_CREAT | O_BINARY | O_RDWR, 0644);
|
|
if (scoreboard_fd == -1) {
|
|
perror(ap_scoreboard_fname);
|
|
fprintf(stderr, "Cannot open scoreboard file:\n");
|
|
exit(APEXIT_INIT);
|
|
}
|
|
ap_register_cleanup(p, NULL, cleanup_scoreboard_file, ap_null_cleanup);
|
|
|
|
memset((char *) ap_scoreboard_image, 0, sizeof(*ap_scoreboard_image));
|
|
ap_scoreboard_image->global.running_generation = running_gen;
|
|
force_write(scoreboard_fd, ap_scoreboard_image, sizeof(*ap_scoreboard_image));
|
|
#endif
|
|
}
|
|
|
|
/* Routines called to deal with the scoreboard image
|
|
* --- note that we do *not* need write locks, since update_child_status
|
|
* only updates a *single* record in place, and only one process writes to
|
|
* a given scoreboard slot at a time (either the child process owning that
|
|
* slot, or the parent, noting that the child has died).
|
|
*
|
|
* As a final note --- setting the score entry to getpid() is always safe,
|
|
* since when the parent is writing an entry, it's only noting SERVER_DEAD
|
|
* anyway.
|
|
*/
|
|
|
|
ap_inline void ap_sync_scoreboard_image(void)
|
|
{
|
|
#ifdef SCOREBOARD_FILE
|
|
lseek(scoreboard_fd, 0L, 0);
|
|
force_read(scoreboard_fd, ap_scoreboard_image, sizeof(*ap_scoreboard_image));
|
|
#endif
|
|
}
|
|
|
|
API_EXPORT(int) ap_exists_scoreboard_image(void)
|
|
{
|
|
return (ap_scoreboard_image ? 1 : 0);
|
|
}
|
|
|
|
static ap_inline void put_scoreboard_info(int child_num,
|
|
short_score *new_score_rec)
|
|
{
|
|
#ifdef SCOREBOARD_FILE
|
|
lseek(scoreboard_fd, (long) child_num * sizeof(short_score), 0);
|
|
force_write(scoreboard_fd, new_score_rec, sizeof(short_score));
|
|
#endif
|
|
}
|
|
|
|
int ap_update_child_status(int child_num, int status, request_rec *r)
|
|
{
|
|
int old_status;
|
|
short_score *ss;
|
|
|
|
if (child_num < 0)
|
|
return -1;
|
|
|
|
ap_check_signals();
|
|
|
|
ap_sync_scoreboard_image();
|
|
ss = &ap_scoreboard_image->servers[child_num];
|
|
old_status = ss->status;
|
|
ss->status = status;
|
|
|
|
if (ap_extended_status) {
|
|
if (status == SERVER_READY || status == SERVER_DEAD) {
|
|
/*
|
|
* Reset individual counters
|
|
*/
|
|
if (status == SERVER_DEAD) {
|
|
ss->my_access_count = 0L;
|
|
ss->my_bytes_served = 0L;
|
|
}
|
|
ss->conn_count = (unsigned short) 0;
|
|
ss->conn_bytes = (unsigned long) 0;
|
|
}
|
|
if (r) {
|
|
conn_rec *c = r->connection;
|
|
ap_cpystrn(ss->client, ap_get_remote_host(c, r->per_dir_config,
|
|
REMOTE_NOLOOKUP), sizeof(ss->client));
|
|
if (r->the_request == NULL) {
|
|
ap_cpystrn(ss->request, "NULL", sizeof(ss->request));
|
|
} else if (r->parsed_uri.password == NULL) {
|
|
ap_cpystrn(ss->request, r->the_request, sizeof(ss->request));
|
|
} else {
|
|
/* Don't reveal the password in the server-status view */
|
|
ap_cpystrn(ss->request, ap_pstrcat(r->pool, r->method, " ",
|
|
ap_unparse_uri_components(r->pool, &r->parsed_uri, UNP_OMITPASSWORD),
|
|
r->assbackwards ? NULL : " ", r->protocol, NULL),
|
|
sizeof(ss->request));
|
|
}
|
|
ss->vhostrec = r->server;
|
|
}
|
|
}
|
|
if (status == SERVER_STARTING && r == NULL) {
|
|
/* clean up the slot's vhostrec pointer (maybe re-used)
|
|
* and mark the slot as belonging to a new generation.
|
|
*/
|
|
ss->vhostrec = NULL;
|
|
ap_scoreboard_image->parent[child_num].generation = ap_my_generation;
|
|
#ifdef SCOREBOARD_FILE
|
|
lseek(scoreboard_fd, XtOffsetOf(scoreboard, parent[child_num]), 0);
|
|
force_write(scoreboard_fd, &ap_scoreboard_image->parent[child_num],
|
|
sizeof(parent_score));
|
|
#endif
|
|
}
|
|
put_scoreboard_info(child_num, ss);
|
|
|
|
return old_status;
|
|
}
|
|
|
|
static void update_scoreboard_global(void)
|
|
{
|
|
#ifdef SCOREBOARD_FILE
|
|
lseek(scoreboard_fd,
|
|
(char *) &ap_scoreboard_image->global -(char *) ap_scoreboard_image, 0);
|
|
force_write(scoreboard_fd, &ap_scoreboard_image->global,
|
|
sizeof ap_scoreboard_image->global);
|
|
#endif
|
|
}
|
|
|
|
void ap_time_process_request(int child_num, int status)
|
|
{
|
|
short_score *ss;
|
|
#if defined(NO_GETTIMEOFDAY) && !defined(NO_TIMES)
|
|
struct tms tms_blk;
|
|
#endif
|
|
|
|
if (child_num < 0)
|
|
return;
|
|
|
|
ap_sync_scoreboard_image();
|
|
ss = &ap_scoreboard_image->servers[child_num];
|
|
|
|
if (status == START_PREQUEST) {
|
|
#if defined(NO_GETTIMEOFDAY)
|
|
#ifndef NO_TIMES
|
|
if ((ss->start_time = times(&tms_blk)) == -1)
|
|
#endif /* NO_TIMES */
|
|
ss->start_time = (clock_t) 0;
|
|
#else
|
|
if (gettimeofday(&ss->start_time, (struct timezone *) 0) < 0)
|
|
ss->start_time.tv_sec =
|
|
ss->start_time.tv_usec = 0L;
|
|
#endif
|
|
}
|
|
else if (status == STOP_PREQUEST) {
|
|
#if defined(NO_GETTIMEOFDAY)
|
|
#ifndef NO_TIMES
|
|
if ((ss->stop_time = times(&tms_blk)) == -1)
|
|
#endif
|
|
ss->stop_time = ss->start_time = (clock_t) 0;
|
|
#else
|
|
if (gettimeofday(&ss->stop_time, (struct timezone *) 0) < 0)
|
|
ss->stop_time.tv_sec =
|
|
ss->stop_time.tv_usec =
|
|
ss->start_time.tv_sec =
|
|
ss->start_time.tv_usec = 0L;
|
|
#endif
|
|
|
|
}
|
|
|
|
put_scoreboard_info(child_num, ss);
|
|
}
|
|
|
|
/*
|
|
static void increment_counts(int child_num, request_rec *r)
|
|
{
|
|
long int bs = 0;
|
|
short_score *ss;
|
|
|
|
ap_sync_scoreboard_image();
|
|
ss = &ap_scoreboard_image->servers[child_num];
|
|
|
|
if (r->sent_bodyct)
|
|
ap_bgetopt(r->connection->client, BO_BYTECT, &bs);
|
|
|
|
#ifndef NO_TIMES
|
|
times(&ss->times);
|
|
#endif
|
|
ss->access_count++;
|
|
ss->my_access_count++;
|
|
ss->conn_count++;
|
|
ss->bytes_served += (unsigned long) bs;
|
|
ss->my_bytes_served += (unsigned long) bs;
|
|
ss->conn_bytes += (unsigned long) bs;
|
|
|
|
put_scoreboard_info(child_num, ss);
|
|
}
|
|
*/
|
|
|
|
static int find_child_by_pid(int pid)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < max_daemons_limit; ++i)
|
|
if (ap_scoreboard_image->parent[i].pid == pid)
|
|
return i;
|
|
|
|
return -1;
|
|
}
|
|
|
|
static void reclaim_child_processes(int terminate)
|
|
{
|
|
#ifndef MULTITHREAD
|
|
int i, status;
|
|
long int waittime = 1024 * 16; /* in usecs */
|
|
struct timeval tv;
|
|
int waitret, tries;
|
|
int not_dead_yet;
|
|
#ifdef HAS_OTHER_CHILD
|
|
other_child_rec *ocr, *nocr;
|
|
#endif
|
|
|
|
ap_sync_scoreboard_image();
|
|
|
|
for (tries = terminate ? 4 : 1; tries <= 9; ++tries) {
|
|
/* don't want to hold up progress any more than
|
|
* necessary, but we need to allow children a few moments to exit.
|
|
* Set delay with an exponential backoff.
|
|
*/
|
|
tv.tv_sec = waittime / 1000000;
|
|
tv.tv_usec = waittime % 1000000;
|
|
waittime = waittime * 4;
|
|
ap_select(0, NULL, NULL, NULL, &tv);
|
|
|
|
/* now see who is done */
|
|
not_dead_yet = 0;
|
|
for (i = 0; i < max_daemons_limit; ++i) {
|
|
int pid = ap_scoreboard_image->parent[i].pid;
|
|
|
|
if (pid == my_pid || pid == 0)
|
|
continue;
|
|
|
|
waitret = waitpid(pid, &status, WNOHANG);
|
|
if (waitret == pid || waitret == -1) {
|
|
ap_scoreboard_image->parent[i].pid = 0;
|
|
continue;
|
|
}
|
|
++not_dead_yet;
|
|
switch (tries) {
|
|
case 1: /* 16ms */
|
|
case 2: /* 82ms */
|
|
break;
|
|
case 3: /* 344ms */
|
|
/* perhaps it missed the SIGHUP, lets try again */
|
|
ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_WARNING,
|
|
server_conf,
|
|
"child process %d did not exit, sending another SIGHUP",
|
|
pid);
|
|
kill(pid, SIGHUP);
|
|
waittime = 1024 * 16;
|
|
break;
|
|
case 4: /* 16ms */
|
|
case 5: /* 82ms */
|
|
case 6: /* 344ms */
|
|
break;
|
|
case 7: /* 1.4sec */
|
|
/* ok, now it's being annoying */
|
|
ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_WARNING,
|
|
server_conf,
|
|
"child process %d still did not exit, sending a SIGTERM",
|
|
pid);
|
|
kill(pid, SIGTERM);
|
|
break;
|
|
case 8: /* 6 sec */
|
|
/* die child scum */
|
|
ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_ERR, server_conf,
|
|
"child process %d still did not exit, sending a SIGKILL",
|
|
pid);
|
|
kill(pid, SIGKILL);
|
|
break;
|
|
case 9: /* 14 sec */
|
|
/* gave it our best shot, but alas... If this really
|
|
* is a child we are trying to kill and it really hasn't
|
|
* exited, we will likely fail to bind to the port
|
|
* after the restart.
|
|
*/
|
|
ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_ERR, server_conf,
|
|
"could not make child process %d exit, "
|
|
"attempting to continue anyway", pid);
|
|
break;
|
|
}
|
|
}
|
|
#ifdef HAS_OTHER_CHILD
|
|
for (ocr = other_children; ocr; ocr = nocr) {
|
|
nocr = ocr->next;
|
|
if (ocr->pid == -1)
|
|
continue;
|
|
|
|
waitret = waitpid(ocr->pid, &status, WNOHANG);
|
|
if (waitret == ocr->pid) {
|
|
ocr->pid = -1;
|
|
(*ocr->maintenance) (OC_REASON_DEATH, ocr->data, status);
|
|
}
|
|
else if (waitret == 0) {
|
|
(*ocr->maintenance) (OC_REASON_RESTART, ocr->data, -1);
|
|
++not_dead_yet;
|
|
}
|
|
else if (waitret == -1) {
|
|
/* uh what the heck? they didn't call unregister? */
|
|
ocr->pid = -1;
|
|
(*ocr->maintenance) (OC_REASON_LOST, ocr->data, -1);
|
|
}
|
|
}
|
|
#endif
|
|
if (!not_dead_yet) {
|
|
/* nothing left to wait for */
|
|
break;
|
|
}
|
|
}
|
|
#endif /* ndef MULTITHREAD */
|
|
}
|
|
|
|
|
|
#if defined(NEED_WAITPID)
|
|
/*
|
|
Systems without a real waitpid sometimes lose a child's exit while waiting
|
|
for another. Search through the scoreboard for missing children.
|
|
*/
|
|
int reap_children(ap_wait_t *status)
|
|
{
|
|
int n, pid;
|
|
|
|
for (n = 0; n < max_daemons_limit; ++n) {
|
|
ap_sync_scoreboard_image();
|
|
if (ap_scoreboard_image->servers[n].status != SERVER_DEAD &&
|
|
kill((pid = ap_scoreboard_image->parent[n].pid), 0) == -1) {
|
|
ap_update_child_status(n, SERVER_DEAD, NULL);
|
|
/* just mark it as having a successful exit status */
|
|
bzero((char *) status, sizeof(ap_wait_t));
|
|
return(pid);
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
/* Finally, this routine is used by the caretaker process to wait for
|
|
* a while...
|
|
*/
|
|
|
|
/* number of calls to wait_or_timeout between writable probes */
|
|
#ifndef INTERVAL_OF_WRITABLE_PROBES
|
|
#define INTERVAL_OF_WRITABLE_PROBES 10
|
|
#endif
|
|
static int wait_or_timeout_counter;
|
|
|
|
static int wait_or_timeout(ap_wait_t *status)
|
|
{
|
|
struct timeval tv;
|
|
int ret;
|
|
|
|
++wait_or_timeout_counter;
|
|
if (wait_or_timeout_counter == INTERVAL_OF_WRITABLE_PROBES) {
|
|
wait_or_timeout_counter = 0;
|
|
#ifdef HAS_OTHER_CHILD
|
|
probe_writable_fds();
|
|
#endif
|
|
}
|
|
ret = waitpid(-1, status, WNOHANG);
|
|
if (ret == -1 && errno == EINTR) {
|
|
return -1;
|
|
}
|
|
if (ret > 0) {
|
|
return ret;
|
|
}
|
|
#ifdef NEED_WAITPID
|
|
if ((ret = reap_children(status)) > 0) {
|
|
return ret;
|
|
}
|
|
#endif
|
|
tv.tv_sec = SCOREBOARD_MAINTENANCE_INTERVAL / 1000000;
|
|
tv.tv_usec = SCOREBOARD_MAINTENANCE_INTERVAL % 1000000;
|
|
ap_select(0, NULL, NULL, NULL, &tv);
|
|
return -1;
|
|
}
|
|
|
|
|
|
#if defined(NSIG)
|
|
#define NumSIG NSIG
|
|
#elif defined(_NSIG)
|
|
#define NumSIG _NSIG
|
|
#elif defined(__NSIG)
|
|
#define NumSIG __NSIG
|
|
#else
|
|
#define NumSIG 32 /* for 1998's unixes, this is still a good assumption */
|
|
#endif
|
|
|
|
#ifdef SYS_SIGLIST /* platform has sys_siglist[] */
|
|
#define INIT_SIGLIST() /*nothing*/
|
|
#else /* platform has no sys_siglist[], define our own */
|
|
#define SYS_SIGLIST ap_sys_siglist
|
|
#define INIT_SIGLIST() siglist_init();
|
|
|
|
const char *ap_sys_siglist[NumSIG];
|
|
|
|
static void siglist_init(void)
|
|
{
|
|
int sig;
|
|
|
|
ap_sys_siglist[0] = "Signal 0";
|
|
#ifdef SIGHUP
|
|
ap_sys_siglist[SIGHUP] = "Hangup";
|
|
#endif
|
|
#ifdef SIGINT
|
|
ap_sys_siglist[SIGINT] = "Interrupt";
|
|
#endif
|
|
#ifdef SIGQUIT
|
|
ap_sys_siglist[SIGQUIT] = "Quit";
|
|
#endif
|
|
#ifdef SIGILL
|
|
ap_sys_siglist[SIGILL] = "Illegal instruction";
|
|
#endif
|
|
#ifdef SIGTRAP
|
|
ap_sys_siglist[SIGTRAP] = "Trace/BPT trap";
|
|
#endif
|
|
#ifdef SIGIOT
|
|
ap_sys_siglist[SIGIOT] = "IOT instruction";
|
|
#endif
|
|
#ifdef SIGABRT
|
|
ap_sys_siglist[SIGABRT] = "Abort";
|
|
#endif
|
|
#ifdef SIGEMT
|
|
ap_sys_siglist[SIGEMT] = "Emulator trap";
|
|
#endif
|
|
#ifdef SIGFPE
|
|
ap_sys_siglist[SIGFPE] = "Arithmetic exception";
|
|
#endif
|
|
#ifdef SIGKILL
|
|
ap_sys_siglist[SIGKILL] = "Killed";
|
|
#endif
|
|
#ifdef SIGBUS
|
|
ap_sys_siglist[SIGBUS] = "Bus error";
|
|
#endif
|
|
#ifdef SIGSEGV
|
|
ap_sys_siglist[SIGSEGV] = "Segmentation fault";
|
|
#endif
|
|
#ifdef SIGSYS
|
|
ap_sys_siglist[SIGSYS] = "Bad system call";
|
|
#endif
|
|
#ifdef SIGPIPE
|
|
ap_sys_siglist[SIGPIPE] = "Broken pipe";
|
|
#endif
|
|
#ifdef SIGALRM
|
|
ap_sys_siglist[SIGALRM] = "Alarm clock";
|
|
#endif
|
|
#ifdef SIGTERM
|
|
ap_sys_siglist[SIGTERM] = "Terminated";
|
|
#endif
|
|
#ifdef SIGUSR1
|
|
ap_sys_siglist[SIGUSR1] = "User defined signal 1";
|
|
#endif
|
|
#ifdef SIGUSR2
|
|
ap_sys_siglist[SIGUSR2] = "User defined signal 2";
|
|
#endif
|
|
#ifdef SIGCLD
|
|
ap_sys_siglist[SIGCLD] = "Child status change";
|
|
#endif
|
|
#ifdef SIGCHLD
|
|
ap_sys_siglist[SIGCHLD] = "Child status change";
|
|
#endif
|
|
#ifdef SIGPWR
|
|
ap_sys_siglist[SIGPWR] = "Power-fail restart";
|
|
#endif
|
|
#ifdef SIGWINCH
|
|
ap_sys_siglist[SIGWINCH] = "Window changed";
|
|
#endif
|
|
#ifdef SIGURG
|
|
ap_sys_siglist[SIGURG] = "urgent socket condition";
|
|
#endif
|
|
#ifdef SIGPOLL
|
|
ap_sys_siglist[SIGPOLL] = "Pollable event occurred";
|
|
#endif
|
|
#ifdef SIGIO
|
|
ap_sys_siglist[SIGIO] = "socket I/O possible";
|
|
#endif
|
|
#ifdef SIGSTOP
|
|
ap_sys_siglist[SIGSTOP] = "Stopped (signal)";
|
|
#endif
|
|
#ifdef SIGTSTP
|
|
ap_sys_siglist[SIGTSTP] = "Stopped";
|
|
#endif
|
|
#ifdef SIGCONT
|
|
ap_sys_siglist[SIGCONT] = "Continued";
|
|
#endif
|
|
#ifdef SIGTTIN
|
|
ap_sys_siglist[SIGTTIN] = "Stopped (tty input)";
|
|
#endif
|
|
#ifdef SIGTTOU
|
|
ap_sys_siglist[SIGTTOU] = "Stopped (tty output)";
|
|
#endif
|
|
#ifdef SIGVTALRM
|
|
ap_sys_siglist[SIGVTALRM] = "virtual timer expired";
|
|
#endif
|
|
#ifdef SIGPROF
|
|
ap_sys_siglist[SIGPROF] = "profiling timer expired";
|
|
#endif
|
|
#ifdef SIGXCPU
|
|
ap_sys_siglist[SIGXCPU] = "exceeded cpu limit";
|
|
#endif
|
|
#ifdef SIGXFSZ
|
|
ap_sys_siglist[SIGXFSZ] = "exceeded file size limit";
|
|
#endif
|
|
for (sig=0; sig < sizeof(ap_sys_siglist)/sizeof(ap_sys_siglist[0]); ++sig)
|
|
if (ap_sys_siglist[sig] == NULL)
|
|
ap_sys_siglist[sig] = "";
|
|
}
|
|
#endif /* platform has sys_siglist[] */
|
|
|
|
|
|
/* handle all varieties of core dumping signals */
|
|
static void sig_coredump(int sig)
|
|
{
|
|
chdir(ap_coredump_dir);
|
|
signal(sig, SIG_DFL);
|
|
kill(getpid(), sig);
|
|
/* At this point we've got sig blocked, because we're still inside
|
|
* the signal handler. When we leave the signal handler it will
|
|
* be unblocked, and we'll take the signal... and coredump or whatever
|
|
* is appropriate for this particular Unix. In addition the parent
|
|
* will see the real signal we received -- whereas if we called
|
|
* abort() here, the parent would only see SIGABRT.
|
|
*/
|
|
}
|
|
|
|
/*****************************************************************
|
|
* Connection structures and accounting...
|
|
*/
|
|
|
|
static void just_die(int sig)
|
|
{
|
|
clean_child_exit(0);
|
|
}
|
|
|
|
static int volatile deferred_die;
|
|
static int volatile usr1_just_die;
|
|
|
|
static void usr1_handler(int sig)
|
|
{
|
|
if (usr1_just_die) {
|
|
just_die(sig);
|
|
}
|
|
deferred_die = 1;
|
|
}
|
|
|
|
/* volatile just in case */
|
|
static int volatile shutdown_pending;
|
|
static int volatile restart_pending;
|
|
static int volatile is_graceful;
|
|
ap_generation_t volatile ap_my_generation=0;
|
|
|
|
static void sig_term(int sig)
|
|
{
|
|
if (shutdown_pending == 1) {
|
|
/* Um, is this _probably_ not an error, if the user has
|
|
* tried to do a shutdown twice quickly, so we won't
|
|
* worry about reporting it.
|
|
*/
|
|
return;
|
|
}
|
|
shutdown_pending = 1;
|
|
}
|
|
|
|
static void restart(int sig)
|
|
{
|
|
if (restart_pending == 1) {
|
|
/* Probably not an error - don't bother reporting it */
|
|
return;
|
|
}
|
|
restart_pending = 1;
|
|
is_graceful = sig == SIGUSR1;
|
|
}
|
|
|
|
static void set_signals(void)
|
|
{
|
|
#ifndef NO_USE_SIGACTION
|
|
struct sigaction sa;
|
|
|
|
sigemptyset(&sa.sa_mask);
|
|
sa.sa_flags = 0;
|
|
|
|
if (!one_process) {
|
|
sa.sa_handler = sig_coredump;
|
|
#if defined(SA_ONESHOT)
|
|
sa.sa_flags = SA_ONESHOT;
|
|
#elif defined(SA_RESETHAND)
|
|
sa.sa_flags = SA_RESETHAND;
|
|
#endif
|
|
if (sigaction(SIGSEGV, &sa, NULL) < 0)
|
|
ap_log_error(APLOG_MARK, APLOG_WARNING, server_conf, "sigaction(SIGSEGV)");
|
|
#ifdef SIGBUS
|
|
if (sigaction(SIGBUS, &sa, NULL) < 0)
|
|
ap_log_error(APLOG_MARK, APLOG_WARNING, server_conf, "sigaction(SIGBUS)");
|
|
#endif
|
|
#ifdef SIGABORT
|
|
if (sigaction(SIGABORT, &sa, NULL) < 0)
|
|
ap_log_error(APLOG_MARK, APLOG_WARNING, server_conf, "sigaction(SIGABORT)");
|
|
#endif
|
|
#ifdef SIGABRT
|
|
if (sigaction(SIGABRT, &sa, NULL) < 0)
|
|
ap_log_error(APLOG_MARK, APLOG_WARNING, server_conf, "sigaction(SIGABRT)");
|
|
#endif
|
|
#ifdef SIGILL
|
|
if (sigaction(SIGILL, &sa, NULL) < 0)
|
|
ap_log_error(APLOG_MARK, APLOG_WARNING, server_conf, "sigaction(SIGILL)");
|
|
#endif
|
|
sa.sa_flags = 0;
|
|
}
|
|
sa.sa_handler = sig_term;
|
|
if (sigaction(SIGTERM, &sa, NULL) < 0)
|
|
ap_log_error(APLOG_MARK, APLOG_WARNING, server_conf, "sigaction(SIGTERM)");
|
|
#ifdef SIGINT
|
|
if (sigaction(SIGINT, &sa, NULL) < 0)
|
|
ap_log_error(APLOG_MARK, APLOG_WARNING, server_conf, "sigaction(SIGINT)");
|
|
#endif
|
|
#ifdef SIGXCPU
|
|
sa.sa_handler = SIG_DFL;
|
|
if (sigaction(SIGXCPU, &sa, NULL) < 0)
|
|
ap_log_error(APLOG_MARK, APLOG_WARNING, server_conf, "sigaction(SIGXCPU)");
|
|
#endif
|
|
#ifdef SIGXFSZ
|
|
sa.sa_handler = SIG_DFL;
|
|
if (sigaction(SIGXFSZ, &sa, NULL) < 0)
|
|
ap_log_error(APLOG_MARK, APLOG_WARNING, server_conf, "sigaction(SIGXFSZ)");
|
|
#endif
|
|
#ifdef SIGPIPE
|
|
sa.sa_handler = SIG_IGN;
|
|
if (sigaction(SIGPIPE, &sa, NULL) < 0)
|
|
ap_log_error(APLOG_MARK, APLOG_WARNING, server_conf, "sigaction(SIGPIPE)");
|
|
#endif
|
|
|
|
/* we want to ignore HUPs and USR1 while we're busy processing one */
|
|
sigaddset(&sa.sa_mask, SIGHUP);
|
|
sigaddset(&sa.sa_mask, SIGUSR1);
|
|
sa.sa_handler = restart;
|
|
if (sigaction(SIGHUP, &sa, NULL) < 0)
|
|
ap_log_error(APLOG_MARK, APLOG_WARNING, server_conf, "sigaction(SIGHUP)");
|
|
if (sigaction(SIGUSR1, &sa, NULL) < 0)
|
|
ap_log_error(APLOG_MARK, APLOG_WARNING, server_conf, "sigaction(SIGUSR1)");
|
|
#else
|
|
if (!one_process) {
|
|
signal(SIGSEGV, sig_coredump);
|
|
#ifdef SIGBUS
|
|
signal(SIGBUS, sig_coredump);
|
|
#endif /* SIGBUS */
|
|
#ifdef SIGABORT
|
|
signal(SIGABORT, sig_coredump);
|
|
#endif /* SIGABORT */
|
|
#ifdef SIGABRT
|
|
signal(SIGABRT, sig_coredump);
|
|
#endif /* SIGABRT */
|
|
#ifdef SIGILL
|
|
signal(SIGILL, sig_coredump);
|
|
#endif /* SIGILL */
|
|
#ifdef SIGXCPU
|
|
signal(SIGXCPU, SIG_DFL);
|
|
#endif /* SIGXCPU */
|
|
#ifdef SIGXFSZ
|
|
signal(SIGXFSZ, SIG_DFL);
|
|
#endif /* SIGXFSZ */
|
|
}
|
|
|
|
signal(SIGTERM, sig_term);
|
|
#ifdef SIGHUP
|
|
signal(SIGHUP, restart);
|
|
#endif /* SIGHUP */
|
|
#ifdef SIGUSR1
|
|
signal(SIGUSR1, restart);
|
|
#endif /* SIGUSR1 */
|
|
#ifdef SIGPIPE
|
|
signal(SIGPIPE, SIG_IGN);
|
|
#endif /* SIGPIPE */
|
|
|
|
#endif
|
|
}
|
|
|
|
#if defined(TCP_NODELAY) && !defined(MPE) && !defined(TPF)
|
|
static void sock_disable_nagle(int s)
|
|
{
|
|
/* The Nagle algorithm says that we should delay sending partial
|
|
* packets in hopes of getting more data. We don't want to do
|
|
* this; we are not telnet. There are bad interactions between
|
|
* persistent connections and Nagle's algorithm that have very severe
|
|
* performance penalties. (Failing to disable Nagle is not much of a
|
|
* problem with simple HTTP.)
|
|
*
|
|
* In spite of these problems, failure here is not a shooting offense.
|
|
*/
|
|
int just_say_no = 1;
|
|
|
|
if (setsockopt(s, IPPROTO_TCP, TCP_NODELAY, (char *) &just_say_no,
|
|
sizeof(int)) < 0) {
|
|
ap_log_error(APLOG_MARK, APLOG_WARNING, server_conf,
|
|
"setsockopt: (TCP_NODELAY)");
|
|
}
|
|
}
|
|
|
|
#else
|
|
#define sock_disable_nagle(s) /* NOOP */
|
|
#endif
|
|
|
|
|
|
/*****************************************************************
|
|
* Child process main loop.
|
|
* The following vars are static to avoid getting clobbered by longjmp();
|
|
* they are really private to child_main.
|
|
*/
|
|
|
|
static int srv;
|
|
static int csd;
|
|
static int requests_this_child;
|
|
static fd_set main_fds;
|
|
|
|
API_EXPORT(void) ap_child_terminate(request_rec *r)
|
|
{
|
|
r->connection->keepalive = 0;
|
|
requests_this_child = ap_max_requests_per_child = 1;
|
|
}
|
|
|
|
int ap_graceful_stop_signalled(void)
|
|
{
|
|
ap_sync_scoreboard_image();
|
|
if (deferred_die ||
|
|
ap_scoreboard_image->global.running_generation != ap_my_generation) {
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static void child_main(int child_num_arg)
|
|
{
|
|
NET_SIZE_T clen;
|
|
struct sockaddr sa_server;
|
|
struct sockaddr sa_client;
|
|
ap_listen_rec *lr;
|
|
ap_listen_rec *last_lr;
|
|
ap_listen_rec *first_lr;
|
|
pool *ptrans;
|
|
conn_rec *current_conn;
|
|
ap_iol *iol;
|
|
|
|
my_pid = getpid();
|
|
csd = -1;
|
|
my_child_num = child_num_arg;
|
|
requests_this_child = 0;
|
|
last_lr = NULL;
|
|
|
|
/* Get a sub pool for global allocations in this child, so that
|
|
* we can have cleanups occur when the child exits.
|
|
*/
|
|
pchild = ap_make_sub_pool(pconf);
|
|
|
|
ptrans = ap_make_sub_pool(pchild);
|
|
|
|
/* needs to be done before we switch UIDs so we have permissions */
|
|
reopen_scoreboard(pchild);
|
|
SAFE_ACCEPT(accept_mutex_child_init(pchild));
|
|
|
|
if (unixd_setup_child()) {
|
|
clean_child_exit(APEXIT_CHILDFATAL);
|
|
}
|
|
|
|
ap_child_init_hook(pchild, server_conf);
|
|
|
|
(void) ap_update_child_status(my_child_num, SERVER_READY, (request_rec *) NULL);
|
|
|
|
signal(SIGHUP, just_die);
|
|
signal(SIGTERM, just_die);
|
|
|
|
#ifdef OS2
|
|
/* Stop Ctrl-C/Ctrl-Break signals going to child processes */
|
|
{
|
|
unsigned long ulTimes;
|
|
DosSetSignalExceptionFocus(0, &ulTimes);
|
|
}
|
|
#endif
|
|
|
|
while (!ap_graceful_stop_signalled()) {
|
|
BUFF *conn_io;
|
|
|
|
/* Prepare to receive a SIGUSR1 due to graceful restart so that
|
|
* we can exit cleanly.
|
|
*/
|
|
usr1_just_die = 1;
|
|
signal(SIGUSR1, usr1_handler);
|
|
|
|
/*
|
|
* (Re)initialize this child to a pre-connection state.
|
|
*/
|
|
|
|
current_conn = NULL;
|
|
|
|
ap_clear_pool(ptrans);
|
|
|
|
if ((ap_max_requests_per_child > 0
|
|
&& requests_this_child++ >= ap_max_requests_per_child)) {
|
|
clean_child_exit(0);
|
|
}
|
|
|
|
(void) ap_update_child_status(my_child_num, SERVER_READY, (request_rec *) NULL);
|
|
|
|
/*
|
|
* Wait for an acceptable connection to arrive.
|
|
*/
|
|
|
|
/* Lock around "accept", if necessary */
|
|
SAFE_ACCEPT(accept_mutex_on());
|
|
|
|
for (;;) {
|
|
if (ap_listeners->next) {
|
|
/* more than one socket */
|
|
memcpy(&main_fds, &listenfds, sizeof(fd_set));
|
|
srv = ap_select(listenmaxfd + 1, &main_fds, NULL, NULL, NULL);
|
|
|
|
if (srv < 0 && errno != EINTR) {
|
|
/* Single Unix documents select as returning errnos
|
|
* EBADF, EINTR, and EINVAL... and in none of those
|
|
* cases does it make sense to continue. In fact
|
|
* on Linux 2.0.x we seem to end up with EFAULT
|
|
* occasionally, and we'd loop forever due to it.
|
|
*/
|
|
ap_log_error(APLOG_MARK, APLOG_ERR, server_conf, "select: (listen)");
|
|
clean_child_exit(1);
|
|
}
|
|
|
|
if (srv <= 0)
|
|
continue;
|
|
|
|
/* we remember the last_lr we searched last time around so that
|
|
we don't end up starving any particular listening socket */
|
|
if (last_lr == NULL) {
|
|
lr = ap_listeners;
|
|
}
|
|
else {
|
|
lr = last_lr->next;
|
|
if (!lr)
|
|
lr = ap_listeners;
|
|
}
|
|
first_lr=lr;
|
|
do {
|
|
if (FD_ISSET(lr->fd, &main_fds))
|
|
goto got_listener;
|
|
lr = lr->next;
|
|
if (!lr)
|
|
lr = ap_listeners;
|
|
}
|
|
while (lr != first_lr);
|
|
/* FIXME: if we get here, something bad has happened, and we're
|
|
probably gonna spin forever.
|
|
*/
|
|
continue;
|
|
got_listener:
|
|
last_lr = lr;
|
|
sd = lr->fd;
|
|
}
|
|
else {
|
|
/* only one socket, just pretend we did the other stuff */
|
|
sd = ap_listeners->fd;
|
|
}
|
|
|
|
/* if we accept() something we don't want to die, so we have to
|
|
* defer the exit
|
|
*/
|
|
usr1_just_die = 0;
|
|
for (;;) {
|
|
if (deferred_die) {
|
|
/* we didn't get a socket, and we were told to die */
|
|
clean_child_exit(0);
|
|
}
|
|
clen = sizeof(sa_client);
|
|
csd = ap_accept(sd, &sa_client, &clen);
|
|
if (csd >= 0 || errno != EINTR)
|
|
break;
|
|
}
|
|
|
|
if (csd >= 0)
|
|
break; /* We have a socket ready for reading */
|
|
else {
|
|
|
|
/* Our old behaviour here was to continue after accept()
|
|
* errors. But this leads us into lots of troubles
|
|
* because most of the errors are quite fatal. For
|
|
* example, EMFILE can be caused by slow descriptor
|
|
* leaks (say in a 3rd party module, or libc). It's
|
|
* foolish for us to continue after an EMFILE. We also
|
|
* seem to tickle kernel bugs on some platforms which
|
|
* lead to never-ending loops here. So it seems best
|
|
* to just exit in most cases.
|
|
*/
|
|
switch (errno) {
|
|
#ifdef EPROTO
|
|
/* EPROTO on certain older kernels really means
|
|
* ECONNABORTED, so we need to ignore it for them.
|
|
* See discussion in new-httpd archives nh.9701
|
|
* search for EPROTO.
|
|
*
|
|
* Also see nh.9603, search for EPROTO:
|
|
* There is potentially a bug in Solaris 2.x x<6,
|
|
* and other boxes that implement tcp sockets in
|
|
* userland (i.e. on top of STREAMS). On these
|
|
* systems, EPROTO can actually result in a fatal
|
|
* loop. See PR#981 for example. It's hard to
|
|
* handle both uses of EPROTO.
|
|
*/
|
|
case EPROTO:
|
|
#endif
|
|
#ifdef ECONNABORTED
|
|
case ECONNABORTED:
|
|
#endif
|
|
/* Linux generates the rest of these, other tcp
|
|
* stacks (i.e. bsd) tend to hide them behind
|
|
* getsockopt() interfaces. They occur when
|
|
* the net goes sour or the client disconnects
|
|
* after the three-way handshake has been done
|
|
* in the kernel but before userland has picked
|
|
* up the socket.
|
|
*/
|
|
#ifdef ECONNRESET
|
|
case ECONNRESET:
|
|
#endif
|
|
#ifdef ETIMEDOUT
|
|
case ETIMEDOUT:
|
|
#endif
|
|
#ifdef EHOSTUNREACH
|
|
case EHOSTUNREACH:
|
|
#endif
|
|
#ifdef ENETUNREACH
|
|
case ENETUNREACH:
|
|
#endif
|
|
break;
|
|
#ifdef TPF
|
|
case EINACT:
|
|
ap_log_error(APLOG_MARK, APLOG_EMERG, server_conf,
|
|
"offload device inactive");
|
|
clean_child_exit(APEXIT_CHILDFATAL);
|
|
break;
|
|
default:
|
|
ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_ERR, server_conf,
|
|
"select/accept error (%u)", errno);
|
|
clean_child_exit(APEXIT_CHILDFATAL);
|
|
#else
|
|
default:
|
|
ap_log_error(APLOG_MARK, APLOG_ERR, server_conf,
|
|
"accept: (client socket)");
|
|
clean_child_exit(1);
|
|
#endif
|
|
}
|
|
}
|
|
|
|
if (ap_graceful_stop_signalled()) {
|
|
clean_child_exit(0);
|
|
}
|
|
usr1_just_die = 1;
|
|
}
|
|
|
|
SAFE_ACCEPT(accept_mutex_off()); /* unlock after "accept" */
|
|
|
|
#ifdef TPF
|
|
if (csd == 0) /* 0 is invalid socket for TPF */
|
|
continue;
|
|
#endif
|
|
|
|
/* We've got a socket, let's at least process one request off the
|
|
* socket before we accept a graceful restart request. We set
|
|
* the signal to ignore because we don't want to disturb any
|
|
* third party code.
|
|
*/
|
|
signal(SIGUSR1, SIG_IGN);
|
|
|
|
/*
|
|
* We now have a connection, so set it up with the appropriate
|
|
* socket options, file descriptors, and read/write buffers.
|
|
*/
|
|
|
|
clen = sizeof(sa_server);
|
|
if (getsockname(csd, &sa_server, &clen) < 0) {
|
|
ap_log_error(APLOG_MARK, APLOG_ERR, server_conf, "getsockname");
|
|
close(csd);
|
|
continue;
|
|
}
|
|
|
|
sock_disable_nagle(csd);
|
|
|
|
iol = unix_attach_socket(csd);
|
|
if (iol == NULL) {
|
|
if (errno == EBADF) {
|
|
ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_WARNING, NULL,
|
|
"filedescriptor (%u) larger than FD_SETSIZE (%u) "
|
|
"found, you probably need to rebuild Apache with a "
|
|
"larger FD_SETSIZE", csd, FD_SETSIZE);
|
|
}
|
|
else {
|
|
ap_log_error(APLOG_MARK, APLOG_WARNING, NULL,
|
|
"error attaching to socket");
|
|
}
|
|
close(csd);
|
|
continue;
|
|
}
|
|
|
|
(void) ap_update_child_status(my_child_num, SERVER_BUSY_READ,
|
|
(request_rec *) NULL);
|
|
|
|
conn_io = ap_bcreate(ptrans, B_RDWR);
|
|
|
|
ap_bpush_iol(conn_io, iol);
|
|
|
|
current_conn = ap_new_connection(ptrans, server_conf, conn_io,
|
|
(struct sockaddr_in *) &sa_client,
|
|
(struct sockaddr_in *) &sa_server,
|
|
my_child_num, 0);
|
|
|
|
ap_process_connection(current_conn);
|
|
}
|
|
}
|
|
|
|
|
|
static int make_child(server_rec *s, int slot, time_t now)
|
|
{
|
|
int pid;
|
|
|
|
if (slot + 1 > max_daemons_limit) {
|
|
max_daemons_limit = slot + 1;
|
|
}
|
|
|
|
if (one_process) {
|
|
signal(SIGHUP, just_die);
|
|
signal(SIGINT, just_die);
|
|
#ifdef SIGQUIT
|
|
signal(SIGQUIT, SIG_DFL);
|
|
#endif
|
|
signal(SIGTERM, just_die);
|
|
child_main(slot);
|
|
}
|
|
|
|
(void) ap_update_child_status(slot, SERVER_STARTING, (request_rec *) NULL);
|
|
|
|
|
|
#ifdef _OSD_POSIX
|
|
/* BS2000 requires a "special" version of fork() before a setuid() call */
|
|
if ((pid = os_fork(unixd_config.user_name)) == -1) {
|
|
#elif defined(TPF)
|
|
if ((pid = os_fork(s, slot)) == -1) {
|
|
#else
|
|
if ((pid = fork()) == -1) {
|
|
#endif
|
|
ap_log_error(APLOG_MARK, APLOG_ERR, s, "fork: Unable to fork new process");
|
|
|
|
/* fork didn't succeed. Fix the scoreboard or else
|
|
* it will say SERVER_STARTING forever and ever
|
|
*/
|
|
(void) ap_update_child_status(slot, SERVER_DEAD, (request_rec *) NULL);
|
|
|
|
/* In case system resources are maxxed out, we don't want
|
|
Apache running away with the CPU trying to fork over and
|
|
over and over again. */
|
|
sleep(10);
|
|
|
|
return -1;
|
|
}
|
|
|
|
if (!pid) {
|
|
#ifdef AIX_BIND_PROCESSOR
|
|
/* by default AIX binds to a single processor
|
|
* this bit unbinds children which will then bind to another cpu
|
|
*/
|
|
#include <sys/processor.h>
|
|
int status = bindprocessor(BINDPROCESS, (int)getpid(),
|
|
PROCESSOR_CLASS_ANY);
|
|
if (status != OK) {
|
|
ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_WARNING, server_conf,
|
|
"processor unbind failed %d", status);
|
|
}
|
|
#endif
|
|
RAISE_SIGSTOP(MAKE_CHILD);
|
|
/* Disable the restart signal handlers and enable the just_die stuff.
|
|
* Note that since restart() just notes that a restart has been
|
|
* requested there's no race condition here.
|
|
*/
|
|
signal(SIGHUP, just_die);
|
|
signal(SIGUSR1, just_die);
|
|
signal(SIGTERM, just_die);
|
|
child_main(slot);
|
|
}
|
|
|
|
ap_scoreboard_image->parent[slot].pid = pid;
|
|
#ifdef SCOREBOARD_FILE
|
|
lseek(scoreboard_fd, XtOffsetOf(scoreboard, parent[slot]), 0);
|
|
force_write(scoreboard_fd, &ap_scoreboard_image->parent[slot],
|
|
sizeof(parent_score));
|
|
#endif
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
/* start up a bunch of children */
|
|
static void startup_children(int number_to_start)
|
|
{
|
|
int i;
|
|
time_t now = time(0);
|
|
|
|
for (i = 0; number_to_start && i < ap_daemons_limit; ++i) {
|
|
if (ap_scoreboard_image->servers[i].status != SERVER_DEAD) {
|
|
continue;
|
|
}
|
|
if (make_child(server_conf, i, now) < 0) {
|
|
break;
|
|
}
|
|
--number_to_start;
|
|
}
|
|
}
|
|
|
|
|
|
/*
|
|
* idle_spawn_rate is the number of children that will be spawned on the
|
|
* next maintenance cycle if there aren't enough idle servers. It is
|
|
* doubled up to MAX_SPAWN_RATE, and reset only when a cycle goes by
|
|
* without the need to spawn.
|
|
*/
|
|
static int idle_spawn_rate = 1;
|
|
#ifndef MAX_SPAWN_RATE
|
|
#define MAX_SPAWN_RATE (32)
|
|
#endif
|
|
static int hold_off_on_exponential_spawning;
|
|
|
|
static void perform_idle_server_maintenance(void)
|
|
{
|
|
int i;
|
|
int to_kill;
|
|
int idle_count;
|
|
short_score *ss;
|
|
time_t now = time(0);
|
|
int free_length;
|
|
int free_slots[MAX_SPAWN_RATE];
|
|
int last_non_dead;
|
|
int total_non_dead;
|
|
|
|
/* initialize the free_list */
|
|
free_length = 0;
|
|
|
|
to_kill = -1;
|
|
idle_count = 0;
|
|
last_non_dead = -1;
|
|
total_non_dead = 0;
|
|
|
|
ap_sync_scoreboard_image();
|
|
for (i = 0; i < ap_daemons_limit; ++i) {
|
|
int status;
|
|
|
|
if (i >= max_daemons_limit && free_length == idle_spawn_rate)
|
|
break;
|
|
ss = &ap_scoreboard_image->servers[i];
|
|
status = ss->status;
|
|
if (status == SERVER_DEAD) {
|
|
/* try to keep children numbers as low as possible */
|
|
if (free_length < idle_spawn_rate) {
|
|
free_slots[free_length] = i;
|
|
++free_length;
|
|
}
|
|
}
|
|
else {
|
|
/* We consider a starting server as idle because we started it
|
|
* at least a cycle ago, and if it still hasn't finished starting
|
|
* then we're just going to swamp things worse by forking more.
|
|
* So we hopefully won't need to fork more if we count it.
|
|
* This depends on the ordering of SERVER_READY and SERVER_STARTING.
|
|
*/
|
|
if (status <= SERVER_READY) {
|
|
++ idle_count;
|
|
/* always kill the highest numbered child if we have to...
|
|
* no really well thought out reason ... other than observing
|
|
* the server behaviour under linux where lower numbered children
|
|
* tend to service more hits (and hence are more likely to have
|
|
* their data in cpu caches).
|
|
*/
|
|
to_kill = i;
|
|
}
|
|
|
|
++total_non_dead;
|
|
last_non_dead = i;
|
|
}
|
|
}
|
|
max_daemons_limit = last_non_dead + 1;
|
|
if (idle_count > ap_daemons_max_free) {
|
|
/* kill off one child... we use SIGUSR1 because that'll cause it to
|
|
* shut down gracefully, in case it happened to pick up a request
|
|
* while we were counting
|
|
*/
|
|
kill(ap_scoreboard_image->parent[to_kill].pid, SIGUSR1);
|
|
idle_spawn_rate = 1;
|
|
}
|
|
else if (idle_count < ap_daemons_min_free) {
|
|
/* terminate the free list */
|
|
if (free_length == 0) {
|
|
/* only report this condition once */
|
|
static int reported = 0;
|
|
|
|
if (!reported) {
|
|
ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_ERR, server_conf,
|
|
"server reached MaxClients setting, consider"
|
|
" raising the MaxClients setting");
|
|
reported = 1;
|
|
}
|
|
idle_spawn_rate = 1;
|
|
}
|
|
else {
|
|
if (idle_spawn_rate >= 8) {
|
|
ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_INFO, server_conf,
|
|
"server seems busy, (you may need "
|
|
"to increase StartServers, or Min/MaxSpareServers), "
|
|
"spawning %d children, there are %d idle, and "
|
|
"%d total children", idle_spawn_rate,
|
|
idle_count, total_non_dead);
|
|
}
|
|
for (i = 0; i < free_length; ++i) {
|
|
#ifdef TPF
|
|
if(make_child(server_conf, free_slots[i], now) == -1) {
|
|
if(free_length == 1) {
|
|
shutdown_pending = 1;
|
|
ap_log_error(APLOG_MARK, APLOG_EMERG, server_conf,
|
|
"No active child processes: shutting down");
|
|
}
|
|
}
|
|
#else
|
|
make_child(server_conf, free_slots[i], now);
|
|
#endif /* TPF */
|
|
}
|
|
/* the next time around we want to spawn twice as many if this
|
|
* wasn't good enough, but not if we've just done a graceful
|
|
*/
|
|
if (hold_off_on_exponential_spawning) {
|
|
--hold_off_on_exponential_spawning;
|
|
}
|
|
else if (idle_spawn_rate < MAX_SPAWN_RATE) {
|
|
idle_spawn_rate *= 2;
|
|
}
|
|
}
|
|
}
|
|
else {
|
|
idle_spawn_rate = 1;
|
|
}
|
|
}
|
|
|
|
|
|
static void process_child_status(int pid, ap_wait_t status)
|
|
{
|
|
/* Child died... if it died due to a fatal error,
|
|
* we should simply bail out.
|
|
*/
|
|
if ((WIFEXITED(status)) &&
|
|
WEXITSTATUS(status) == APEXIT_CHILDFATAL) {
|
|
ap_log_error(APLOG_MARK, APLOG_ALERT|APLOG_NOERRNO, server_conf,
|
|
"Child %d returned a Fatal error... \n"
|
|
"Apache is exiting!",
|
|
pid);
|
|
exit(APEXIT_CHILDFATAL);
|
|
}
|
|
if (WIFSIGNALED(status)) {
|
|
switch (WTERMSIG(status)) {
|
|
case SIGTERM:
|
|
case SIGHUP:
|
|
case SIGUSR1:
|
|
case SIGKILL:
|
|
break;
|
|
default:
|
|
#ifdef SYS_SIGLIST
|
|
#ifdef WCOREDUMP
|
|
if (WCOREDUMP(status)) {
|
|
ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_NOTICE,
|
|
server_conf,
|
|
"child pid %d exit signal %s (%d), "
|
|
"possible coredump in %s",
|
|
pid, (WTERMSIG(status) >= NumSIG) ? "" :
|
|
SYS_SIGLIST[WTERMSIG(status)], WTERMSIG(status),
|
|
ap_coredump_dir);
|
|
}
|
|
else {
|
|
#endif
|
|
ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_NOTICE,
|
|
server_conf,
|
|
"child pid %d exit signal %s (%d)", pid,
|
|
SYS_SIGLIST[WTERMSIG(status)], WTERMSIG(status));
|
|
#ifdef WCOREDUMP
|
|
}
|
|
#endif
|
|
#else
|
|
ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_NOTICE,
|
|
server_conf,
|
|
"child pid %d exit signal %d",
|
|
pid, WTERMSIG(status));
|
|
#endif
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
static int setup_listeners(pool *pconf, server_rec *s)
|
|
{
|
|
ap_listen_rec *lr;
|
|
|
|
if (ap_listen_open(pconf, s->port)) {
|
|
ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_ALERT, s,
|
|
"no listening sockets available, shutting down");
|
|
return -1;
|
|
}
|
|
|
|
listenmaxfd = -1;
|
|
FD_ZERO(&listenfds);
|
|
for (lr = ap_listeners; lr; lr = lr->next) {
|
|
FD_SET(lr->fd, &listenfds);
|
|
if (lr->fd > listenmaxfd) {
|
|
listenmaxfd = lr->fd;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
|
|
/*****************************************************************
|
|
* Executive routines.
|
|
*/
|
|
|
|
int ap_mpm_run(pool *_pconf, pool *plog, server_rec *s)
|
|
{
|
|
int remaining_children_to_start;
|
|
|
|
pconf = _pconf;
|
|
|
|
server_conf = s;
|
|
|
|
ap_log_pid(pconf, ap_pid_fname);
|
|
|
|
if (setup_listeners(pconf, s)) {
|
|
/* XXX: hey, what's the right way for the mpm to indicate a fatal error? */
|
|
return 1;
|
|
}
|
|
|
|
SAFE_ACCEPT(accept_mutex_init(pconf));
|
|
if (!is_graceful) {
|
|
reinit_scoreboard(pconf);
|
|
}
|
|
#ifdef SCOREBOARD_FILE
|
|
else {
|
|
ap_scoreboard_fname = ap_server_root_relative(pconf, ap_scoreboard_fname);
|
|
ap_note_cleanups_for_fd(pconf, scoreboard_fd);
|
|
}
|
|
#endif
|
|
|
|
set_signals();
|
|
|
|
if (ap_daemons_max_free < ap_daemons_min_free + 1) /* Don't thrash... */
|
|
ap_daemons_max_free = ap_daemons_min_free + 1;
|
|
|
|
/* If we're doing a graceful_restart then we're going to see a lot
|
|
* of children exiting immediately when we get into the main loop
|
|
* below (because we just sent them SIGUSR1). This happens pretty
|
|
* rapidly... and for each one that exits we'll start a new one until
|
|
* we reach at least daemons_min_free. But we may be permitted to
|
|
* start more than that, so we'll just keep track of how many we're
|
|
* supposed to start up without the 1 second penalty between each fork.
|
|
*/
|
|
remaining_children_to_start = ap_daemons_to_start;
|
|
if (remaining_children_to_start > ap_daemons_limit) {
|
|
remaining_children_to_start = ap_daemons_limit;
|
|
}
|
|
if (!is_graceful) {
|
|
startup_children(remaining_children_to_start);
|
|
remaining_children_to_start = 0;
|
|
}
|
|
else {
|
|
/* give the system some time to recover before kicking into
|
|
* exponential mode */
|
|
hold_off_on_exponential_spawning = 10;
|
|
}
|
|
|
|
ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_NOTICE, server_conf,
|
|
"%s configured -- resuming normal operations",
|
|
ap_get_server_version());
|
|
ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_INFO, server_conf,
|
|
"Server built: %s", ap_get_server_built());
|
|
restart_pending = shutdown_pending = 0;
|
|
|
|
while (!restart_pending && !shutdown_pending) {
|
|
int child_slot;
|
|
ap_wait_t status;
|
|
int pid = wait_or_timeout(&status);
|
|
|
|
/* XXX: if it takes longer than 1 second for all our children
|
|
* to start up and get into IDLE state then we may spawn an
|
|
* extra child
|
|
*/
|
|
if (pid >= 0) {
|
|
process_child_status(pid, status);
|
|
/* non-fatal death... note that it's gone in the scoreboard. */
|
|
ap_sync_scoreboard_image();
|
|
child_slot = find_child_by_pid(pid);
|
|
if (child_slot >= 0) {
|
|
(void) ap_update_child_status(child_slot, SERVER_DEAD,
|
|
(request_rec *) NULL);
|
|
if (remaining_children_to_start
|
|
&& child_slot < ap_daemons_limit) {
|
|
/* we're still doing a 1-for-1 replacement of dead
|
|
* children with new children
|
|
*/
|
|
make_child(server_conf, child_slot, time(0));
|
|
--remaining_children_to_start;
|
|
}
|
|
#ifdef HAS_OTHER_CHILD
|
|
}
|
|
else if (reap_other_child(pid, status) == 0) {
|
|
/* handled */
|
|
#endif
|
|
}
|
|
else if (is_graceful) {
|
|
/* Great, we've probably just lost a slot in the
|
|
* scoreboard. Somehow we don't know about this
|
|
* child.
|
|
*/
|
|
ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_WARNING, server_conf,
|
|
"long lost child came home! (pid %d)", pid);
|
|
}
|
|
/* Don't perform idle maintenance when a child dies,
|
|
* only do it when there's a timeout. Remember only a
|
|
* finite number of children can die, and it's pretty
|
|
* pathological for a lot to die suddenly.
|
|
*/
|
|
continue;
|
|
}
|
|
else if (remaining_children_to_start) {
|
|
/* we hit a 1 second timeout in which none of the previous
|
|
* generation of children needed to be reaped... so assume
|
|
* they're all done, and pick up the slack if any is left.
|
|
*/
|
|
startup_children(remaining_children_to_start);
|
|
remaining_children_to_start = 0;
|
|
/* In any event we really shouldn't do the code below because
|
|
* few of the servers we just started are in the IDLE state
|
|
* yet, so we'd mistakenly create an extra server.
|
|
*/
|
|
continue;
|
|
}
|
|
|
|
perform_idle_server_maintenance();
|
|
#ifdef TPF
|
|
shutdown_pending = os_check_server(tpf_server_name);
|
|
ap_check_signals();
|
|
sleep(1);
|
|
#endif /*TPF */
|
|
}
|
|
|
|
if (shutdown_pending) {
|
|
/* Time to gracefully shut down:
|
|
* Kill child processes, tell them to call child_exit, etc...
|
|
*/
|
|
if (ap_killpg(getpgrp(), SIGTERM) < 0) {
|
|
ap_log_error(APLOG_MARK, APLOG_WARNING, server_conf, "killpg SIGTERM");
|
|
}
|
|
reclaim_child_processes(1); /* Start with SIGTERM */
|
|
|
|
/* cleanup pid file on normal shutdown */
|
|
{
|
|
const char *pidfile = NULL;
|
|
pidfile = ap_server_root_relative (pconf, ap_pid_fname);
|
|
if ( pidfile != NULL && unlink(pidfile) == 0)
|
|
ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_INFO,
|
|
server_conf,
|
|
"removed PID file %s (pid=%ld)",
|
|
pidfile, (long)getpid());
|
|
}
|
|
|
|
ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_NOTICE, server_conf,
|
|
"caught SIGTERM, shutting down");
|
|
return 1;
|
|
}
|
|
|
|
/* we've been told to restart */
|
|
signal(SIGHUP, SIG_IGN);
|
|
signal(SIGUSR1, SIG_IGN);
|
|
|
|
if (one_process) {
|
|
/* not worth thinking about */
|
|
return 1;
|
|
}
|
|
|
|
/* advance to the next generation */
|
|
/* XXX: we really need to make sure this new generation number isn't in
|
|
* use by any of the children.
|
|
*/
|
|
++ap_my_generation;
|
|
ap_scoreboard_image->global.running_generation = ap_my_generation;
|
|
update_scoreboard_global();
|
|
|
|
if (is_graceful) {
|
|
#ifndef SCOREBOARD_FILE
|
|
int i;
|
|
#endif
|
|
ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_NOTICE, server_conf,
|
|
"SIGUSR1 received. Doing graceful restart");
|
|
|
|
/* kill off the idle ones */
|
|
if (ap_killpg(getpgrp(), SIGUSR1) < 0) {
|
|
ap_log_error(APLOG_MARK, APLOG_WARNING, server_conf, "killpg SIGUSR1");
|
|
}
|
|
#ifndef SCOREBOARD_FILE
|
|
/* This is mostly for debugging... so that we know what is still
|
|
* gracefully dealing with existing request. But we can't really
|
|
* do it if we're in a SCOREBOARD_FILE because it'll cause
|
|
* corruption too easily.
|
|
*/
|
|
ap_sync_scoreboard_image();
|
|
for (i = 0; i < ap_daemons_limit; ++i) {
|
|
if (ap_scoreboard_image->servers[i].status != SERVER_DEAD) {
|
|
ap_scoreboard_image->servers[i].status = SERVER_GRACEFUL;
|
|
}
|
|
}
|
|
#endif
|
|
}
|
|
else {
|
|
/* Kill 'em off */
|
|
if (ap_killpg(getpgrp(), SIGHUP) < 0) {
|
|
ap_log_error(APLOG_MARK, APLOG_WARNING, server_conf, "killpg SIGHUP");
|
|
}
|
|
reclaim_child_processes(0); /* Not when just starting up */
|
|
ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_NOTICE, server_conf,
|
|
"SIGHUP received. Attempting to restart");
|
|
}
|
|
|
|
if (!is_graceful) {
|
|
ap_restart_time = time(NULL);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void prefork_pre_config(pool *pconf, pool *plog, pool *ptemp)
|
|
{
|
|
static int restart_num = 0;
|
|
|
|
one_process = !!getenv("ONE_PROCESS");
|
|
|
|
/* sigh, want this only the second time around */
|
|
if (restart_num++ == 1) {
|
|
is_graceful = 0;
|
|
|
|
if (!one_process) {
|
|
unixd_detach();
|
|
}
|
|
|
|
my_pid = getpid();
|
|
}
|
|
|
|
unixd_pre_config();
|
|
ap_listen_pre_config();
|
|
ap_daemons_to_start = DEFAULT_START_DAEMON;
|
|
ap_daemons_min_free = DEFAULT_MIN_FREE_DAEMON;
|
|
ap_daemons_max_free = DEFAULT_MAX_FREE_DAEMON;
|
|
ap_daemons_limit = HARD_SERVER_LIMIT;
|
|
ap_pid_fname = DEFAULT_PIDLOG;
|
|
ap_scoreboard_fname = DEFAULT_SCOREBOARD;
|
|
ap_lock_fname = DEFAULT_LOCKFILE;
|
|
ap_max_requests_per_child = DEFAULT_MAX_REQUESTS_PER_CHILD;
|
|
ap_extended_status = 0;
|
|
|
|
ap_cpystrn(ap_coredump_dir, ap_server_root, sizeof(ap_coredump_dir));
|
|
}
|
|
|
|
static void prefork_hooks(void)
|
|
{
|
|
ap_hook_pre_config(prefork_pre_config,NULL,NULL,HOOK_MIDDLE);
|
|
INIT_SIGLIST();
|
|
#ifdef AUX3
|
|
(void) set42sig();
|
|
#endif
|
|
/* TODO: set one_process properly */ one_process = 0;
|
|
}
|
|
|
|
static const char *set_pidfile(cmd_parms *cmd, void *dummy, char *arg)
|
|
{
|
|
const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
|
|
if (err != NULL) {
|
|
return err;
|
|
}
|
|
|
|
if (cmd->server->is_virtual) {
|
|
return "PidFile directive not allowed in <VirtualHost>";
|
|
}
|
|
ap_pid_fname = arg;
|
|
return NULL;
|
|
}
|
|
|
|
static const char *set_scoreboard(cmd_parms *cmd, void *dummy, char *arg)
|
|
{
|
|
const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
|
|
if (err != NULL) {
|
|
return err;
|
|
}
|
|
|
|
ap_scoreboard_fname = arg;
|
|
return NULL;
|
|
}
|
|
|
|
static const char *set_lockfile(cmd_parms *cmd, void *dummy, char *arg)
|
|
{
|
|
const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
|
|
if (err != NULL) {
|
|
return err;
|
|
}
|
|
|
|
ap_lock_fname = arg;
|
|
return NULL;
|
|
}
|
|
|
|
static const char *set_daemons_to_start(cmd_parms *cmd, void *dummy, char *arg)
|
|
{
|
|
const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
|
|
if (err != NULL) {
|
|
return err;
|
|
}
|
|
|
|
ap_daemons_to_start = atoi(arg);
|
|
return NULL;
|
|
}
|
|
|
|
static const char *set_min_free_servers(cmd_parms *cmd, void *dummy, char *arg)
|
|
{
|
|
const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
|
|
if (err != NULL) {
|
|
return err;
|
|
}
|
|
|
|
ap_daemons_min_free = atoi(arg);
|
|
if (ap_daemons_min_free <= 0) {
|
|
fprintf(stderr, "WARNING: detected MinSpareServers set to non-positive.\n");
|
|
fprintf(stderr, "Resetting to 1 to avoid almost certain Apache failure.\n");
|
|
fprintf(stderr, "Please read the documentation.\n");
|
|
ap_daemons_min_free = 1;
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
static const char *set_max_free_servers(cmd_parms *cmd, void *dummy, char *arg)
|
|
{
|
|
const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
|
|
if (err != NULL) {
|
|
return err;
|
|
}
|
|
|
|
ap_daemons_max_free = atoi(arg);
|
|
return NULL;
|
|
}
|
|
|
|
static const char *set_server_limit (cmd_parms *cmd, void *dummy, char *arg)
|
|
{
|
|
const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
|
|
if (err != NULL) {
|
|
return err;
|
|
}
|
|
|
|
ap_daemons_limit = atoi(arg);
|
|
if (ap_daemons_limit > HARD_SERVER_LIMIT) {
|
|
fprintf(stderr, "WARNING: MaxClients of %d exceeds compile time limit "
|
|
"of %d servers,\n", ap_daemons_limit, HARD_SERVER_LIMIT);
|
|
fprintf(stderr, " lowering MaxClients to %d. To increase, please "
|
|
"see the\n", HARD_SERVER_LIMIT);
|
|
fprintf(stderr, " HARD_SERVER_LIMIT define in src/include/httpd.h.\n");
|
|
ap_daemons_limit = HARD_SERVER_LIMIT;
|
|
}
|
|
else if (ap_daemons_limit < 1) {
|
|
fprintf(stderr, "WARNING: Require MaxClients > 0, setting to 1\n");
|
|
ap_daemons_limit = 1;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
static const char *set_max_requests(cmd_parms *cmd, void *dummy, char *arg)
|
|
{
|
|
const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
|
|
if (err != NULL) {
|
|
return err;
|
|
}
|
|
|
|
ap_max_requests_per_child = atoi(arg);
|
|
|
|
return NULL;
|
|
}
|
|
|
|
static const char *set_coredumpdir (cmd_parms *cmd, void *dummy, char *arg)
|
|
{
|
|
struct stat finfo;
|
|
const char *fname;
|
|
const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
|
|
if (err != NULL) {
|
|
return err;
|
|
}
|
|
|
|
fname = ap_server_root_relative(cmd->pool, arg);
|
|
/* ZZZ change this to the AP func FileInfo*/
|
|
if ((stat(fname, &finfo) == -1) || !S_ISDIR(finfo.st_mode)) {
|
|
return ap_pstrcat(cmd->pool, "CoreDumpDirectory ", fname,
|
|
" does not exist or is not a directory", NULL);
|
|
}
|
|
ap_cpystrn(ap_coredump_dir, fname, sizeof(ap_coredump_dir));
|
|
return NULL;
|
|
}
|
|
|
|
/* there are no threads in the prefork model, so the mutexes are
|
|
nops. */
|
|
/* TODO: make these #defines to eliminate the function call */
|
|
|
|
struct ap_thread_mutex {
|
|
int dummy;
|
|
};
|
|
|
|
API_EXPORT(ap_thread_mutex *) ap_thread_mutex_new(void)
|
|
{
|
|
return malloc(sizeof(ap_thread_mutex));
|
|
}
|
|
|
|
API_EXPORT(void) ap_thread_mutex_lock(ap_thread_mutex *mtx)
|
|
{
|
|
}
|
|
|
|
API_EXPORT(void) ap_thread_mutex_unlock(ap_thread_mutex *mtx)
|
|
{
|
|
}
|
|
|
|
API_EXPORT(void) ap_thread_mutex_destroy(ap_thread_mutex *mtx)
|
|
{
|
|
free(mtx);
|
|
}
|
|
|
|
|
|
static const command_rec prefork_cmds[] = {
|
|
UNIX_DAEMON_COMMANDS
|
|
LISTEN_COMMANDS
|
|
{ "PidFile", set_pidfile, NULL, RSRC_CONF, TAKE1,
|
|
"A file for logging the server process ID"},
|
|
{ "ScoreBoardFile", set_scoreboard, NULL, RSRC_CONF, TAKE1,
|
|
"A file for Apache to maintain runtime process management information"},
|
|
{ "LockFile", set_lockfile, NULL, RSRC_CONF, TAKE1,
|
|
"The lockfile used when Apache needs to lock the accept() call"},
|
|
{ "StartServers", set_daemons_to_start, NULL, RSRC_CONF, TAKE1,
|
|
"Number of child processes launched at server startup" },
|
|
{ "MinSpareServers", set_min_free_servers, NULL, RSRC_CONF, TAKE1,
|
|
"Minimum number of idle children, to handle request spikes" },
|
|
{ "MaxSpareServers", set_max_free_servers, NULL, RSRC_CONF, TAKE1,
|
|
"Maximum number of idle children" },
|
|
{ "MaxClients", set_server_limit, NULL, RSRC_CONF, TAKE1,
|
|
"Maximum number of children alive at the same time" },
|
|
{ "MaxRequestsPerChild", set_max_requests, NULL, RSRC_CONF, TAKE1,
|
|
"Maximum number of requests a particular child serves before dying." },
|
|
{ "CoreDumpDirectory", set_coredumpdir, NULL, RSRC_CONF, TAKE1,
|
|
"The location of the directory Apache changes to before dumping core" },
|
|
{ NULL }
|
|
};
|
|
|
|
module MODULE_VAR_EXPORT mpm_prefork_module = {
|
|
STANDARD20_MODULE_STUFF,
|
|
NULL, /* post_config */
|
|
NULL, /* open_logs */
|
|
NULL, /* child_init */
|
|
NULL, /* create per-directory config structure */
|
|
NULL, /* merge per-directory config structures */
|
|
NULL, /* create per-server config structure */
|
|
NULL, /* merge per-server config structures */
|
|
prefork_cmds, /* command table */
|
|
NULL, /* handlers */
|
|
NULL, /* check auth */
|
|
NULL, /* check access */
|
|
prefork_hooks, /* register hooks */
|
|
};
|