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apache/server/mpm/winnt/mpm_winnt.c
Cliff Woolley 3e2ce19baf BUCKET FREELISTS 
Add an allocator-passing mechanism throughout the bucket brigades API.

From Apache's standpoint, the apr_bucket_alloc_t* used throughout a given
connection is stored in the conn_rec by the create_connection hook.  That
means it's the MPM's job to optimize recycling of apr_bucket_alloc_t's --
the MPM must ensure that no two threads can ever use the same one at the
same time, for instance.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@94304 13f79535-47bb-0310-9956-ffa450edef68
2002-03-29 08:17:26 +00:00

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/* ====================================================================
* The Apache Software License, Version 1.1
*
* Copyright (c) 2000-2002 The Apache Software Foundation. All rights
* reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. The end-user documentation included with the redistribution,
* if any, must include the following acknowledgment:
* "This product includes software developed by the
* Apache Software Foundation (http://www.apache.org/)."
* Alternately, this acknowledgment may appear in the software itself,
* if and wherever such third-party acknowledgments normally appear.
*
* 4. The names "Apache" and "Apache Software Foundation" must
* not be used to endorse or promote products derived from this
* software without prior written permission. For written
* permission, please contact apache@apache.org.
*
* 5. Products derived from this software may not be called "Apache",
* nor may "Apache" appear in their name, without prior written
* permission of the Apache Software Foundation.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation. For more
* information on the Apache Software Foundation, please see
* <http://www.apache.org/>.
*
* Portions of this software are based upon public domain software
* originally written at the National Center for Supercomputing Applications,
* University of Illinois, Urbana-Champaign.
*/
#define CORE_PRIVATE
#include "httpd.h"
#include "http_main.h"
#include "http_log.h"
#include "http_config.h" /* for read_config */
#include "http_core.h" /* for get_remote_host */
#include "http_connection.h"
#include "apr_portable.h"
#include "apr_getopt.h"
#include "apr_strings.h"
#include "apr_lib.h"
#include "apr_shm.h"
#include "apr_thread_mutex.h"
#include "ap_mpm.h"
#include "ap_config.h"
#include "ap_listen.h"
#include "mpm_default.h"
#include "mpm_winnt.h"
#include "mpm_common.h"
#include <malloc.h>
/* Limit on the threads per process. Clients will be locked out if more than
* this * HARD_SERVER_LIMIT are needed.
*
* We keep this for one reason it keeps the size of the scoreboard file small
* enough that we can read the whole thing without worrying too much about
* the overhead.
*/
#ifndef HARD_THREAD_LIMIT
#define HARD_THREAD_LIMIT 1920
#endif
/* Limit on the total --- clients will be locked out if more servers than
* this are needed. It is intended solely to keep the server from crashing
* when things get out of hand.
*
* We keep a hard maximum number of servers, for two reasons --- first off,
* in case something goes seriously wrong, we want to stop the fork bomb
* short of actually crashing the machine we're running on by filling some
* kernel table. Secondly, it keeps the size of the scoreboard file small
* enough that we can read the whole thing without worrying too much about
* the overhead.
*/
#define HARD_SERVER_LIMIT 1
/* scoreboard.c does the heavy lifting; all we do is create the child
* score by moving a handle down the pipe into the child's stdin.
*/
extern apr_shm_t *ap_scoreboard_shm;
server_rec *ap_server_conf;
typedef HANDLE thread;
/* Definitions of WINNT MPM specific config globals */
static apr_pool_t *pconf;
static apr_pool_t *pchild = NULL;
static int workers_may_exit = 0;
static int shutdown_in_progress = 0;
static unsigned int g_blocked_threads = 0;
static HANDLE shutdown_event; /* used to signal the parent to shutdown */
static HANDLE restart_event; /* used to signal the parent to restart */
static HANDLE exit_event; /* used by parent to signal the child to exit */
static HANDLE max_requests_per_child_event;
static char ap_coredump_dir[MAX_STRING_LEN];
static int one_process = 0;
static char const* signal_arg = NULL;
OSVERSIONINFO osver; /* VER_PLATFORM_WIN32_NT */
apr_proc_mutex_t *start_mutex;
static DWORD my_pid;
static DWORD parent_pid;
int ap_threads_per_child = 0;
/* ap_my_generation are used by the scoreboard code */
ap_generation_t volatile ap_my_generation=0;
/* Queue for managing the passing of COMP_CONTEXTs between
* the accept and worker threads.
*/
static apr_thread_mutex_t *qlock;
static PCOMP_CONTEXT qhead = NULL;
static PCOMP_CONTEXT qtail = NULL;
static int num_completion_contexts = 0;
static HANDLE ThreadDispatchIOCP = NULL;
/* Stub functions until this MPM supports the connection status API */
AP_DECLARE(void) ap_update_connection_status(long conn_id, const char *key, \
const char *value)
{
/* NOP */
}
AP_DECLARE(void) ap_reset_connection_status(long conn_id)
{
/* NOP */
}
AP_DECLARE(apr_array_header_t *) ap_get_status_table(apr_pool_t *p)
{
/* NOP */
return NULL;
}
/*
* Command processors
*/
static const char *set_threads_per_child (cmd_parms *cmd, void *dummy, char *arg)
{
const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
if (err != NULL) {
return err;
}
ap_threads_per_child = atoi(arg);
if (ap_threads_per_child > HARD_THREAD_LIMIT) {
ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL,
"WARNING: ThreadsPerChild of %d exceeds compile time"
" limit of %d threads,", ap_threads_per_child,
HARD_THREAD_LIMIT);
ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL,
" lowering ThreadsPerChild to %d. To increase, please"
" see the HARD_THREAD_LIMIT define in %s.",
HARD_THREAD_LIMIT, AP_MPM_HARD_LIMITS_FILE);
ap_threads_per_child = HARD_THREAD_LIMIT;
}
else if (ap_threads_per_child < 1) {
ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL,
"WARNING: Require ThreadsPerChild > 0, setting to 1");
ap_threads_per_child = 1;
}
return NULL;
}
static const command_rec winnt_cmds[] = {
LISTEN_COMMANDS,
{ "ThreadsPerChild", set_threads_per_child, NULL, RSRC_CONF, TAKE1,
"Number of threads each child creates" },
{ NULL }
};
AP_DECLARE(void) mpm_recycle_completion_context(PCOMP_CONTEXT pCompContext)
{
/* Recycle the completion context.
* - destroy the ptrans pool
* - put the context on the queue to be consumed by the accept thread
* Note:
* pCompContext->accept_socket may be in a disconnected but reusable
* state so -don't- close it.
*/
if (pCompContext) {
apr_pool_clear(pCompContext->ptrans);
apr_pool_destroy(pCompContext->ptrans);
pCompContext->ptrans = NULL;
pCompContext->next = NULL;
apr_thread_mutex_lock(qlock);
if (qtail)
qtail->next = pCompContext;
else
qhead = pCompContext;
qtail = pCompContext;
apr_thread_mutex_unlock(qlock);
}
}
AP_DECLARE(PCOMP_CONTEXT) mpm_get_completion_context(void)
{
PCOMP_CONTEXT pCompContext = NULL;
/* Grab a context off the queue */
apr_thread_mutex_lock(qlock);
if (qhead) {
pCompContext = qhead;
qhead = qhead->next;
if (!qhead)
qtail = NULL;
}
apr_thread_mutex_unlock(qlock);
/* If we failed to grab a context off the queue, alloc one out of
* the child pool. There may be up to ap_threads_per_child contexts
* in the system at once.
*/
if (!pCompContext) {
if (num_completion_contexts >= ap_threads_per_child) {
static int reported = 0;
if (!reported) {
ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_WARNING, 0, ap_server_conf,
"Server ran out of threads to serve requests. Consider "
"raising the ThreadsPerChild setting");
reported = 1;
}
return NULL;
}
pCompContext = (PCOMP_CONTEXT) apr_pcalloc(pchild, sizeof(COMP_CONTEXT));
pCompContext->Overlapped.hEvent = CreateEvent(NULL, FALSE, FALSE, NULL);
if (pCompContext->Overlapped.hEvent == NULL) {
/* Hopefully this is a temporary condition ... */
ap_log_error(APLOG_MARK,APLOG_WARNING, apr_get_os_error(), ap_server_conf,
"mpm_get_completion_context: CreateEvent failed.");
return NULL;
}
pCompContext->accept_socket = INVALID_SOCKET;
num_completion_contexts++;
}
return pCompContext;
}
AP_DECLARE(apr_status_t) mpm_post_completion_context(PCOMP_CONTEXT pCompContext,
io_state_e state)
{
LPOVERLAPPED pOverlapped;
if (pCompContext)
pOverlapped = &pCompContext->Overlapped;
else
pOverlapped = NULL;
PostQueuedCompletionStatus(ThreadDispatchIOCP, 0, state, pOverlapped);
return APR_SUCCESS;
}
/* This is the helper code to resolve late bound entry points
* missing from one or more releases of the Win32 API...
* but it sure would be nice if we didn't duplicate this code
* from the APR ;-)
*/
static const char* const lateDllName[DLL_defined] = {
"kernel32", "advapi32", "mswsock", "ws2_32" };
static HMODULE lateDllHandle[DLL_defined] = {
NULL, NULL, NULL, NULL };
FARPROC ap_load_dll_func(ap_dlltoken_e fnLib, char* fnName, int ordinal)
{
if (!lateDllHandle[fnLib]) {
lateDllHandle[fnLib] = LoadLibrary(lateDllName[fnLib]);
if (!lateDllHandle[fnLib])
return NULL;
}
if (ordinal)
return GetProcAddress(lateDllHandle[fnLib], (char *) ordinal);
else
return GetProcAddress(lateDllHandle[fnLib], fnName);
}
/* To share the semaphores with other processes, we need a NULL ACL
* Code from MS KB Q106387
*/
static PSECURITY_ATTRIBUTES GetNullACL()
{
PSECURITY_DESCRIPTOR pSD;
PSECURITY_ATTRIBUTES sa;
sa = (PSECURITY_ATTRIBUTES) LocalAlloc(LPTR, sizeof(SECURITY_ATTRIBUTES));
sa->nLength = sizeof(sizeof(SECURITY_ATTRIBUTES));
pSD = (PSECURITY_DESCRIPTOR) LocalAlloc(LPTR, SECURITY_DESCRIPTOR_MIN_LENGTH);
sa->lpSecurityDescriptor = pSD;
if (pSD == NULL || sa == NULL) {
return NULL;
}
apr_set_os_error(0);
if (!InitializeSecurityDescriptor(pSD, SECURITY_DESCRIPTOR_REVISION)
|| apr_get_os_error()) {
LocalFree( pSD );
LocalFree( sa );
return NULL;
}
if (!SetSecurityDescriptorDacl(pSD, TRUE, (PACL) NULL, FALSE)
|| apr_get_os_error()) {
LocalFree( pSD );
LocalFree( sa );
return NULL;
}
sa->bInheritHandle = TRUE;
return sa;
}
static void CleanNullACL( void *sa ) {
if( sa ) {
LocalFree( ((PSECURITY_ATTRIBUTES)sa)->lpSecurityDescriptor);
LocalFree( sa );
}
}
/*
* The Win32 call WaitForMultipleObjects will only allow you to wait for
* a maximum of MAXIMUM_WAIT_OBJECTS (current 64). Since the threading
* model in the multithreaded version of apache wants to use this call,
* we are restricted to a maximum of 64 threads. This is a simplistic
* routine that will increase this size.
*/
static DWORD wait_for_many_objects(DWORD nCount, CONST HANDLE *lpHandles,
DWORD dwSeconds)
{
time_t tStopTime;
DWORD dwRet = WAIT_TIMEOUT;
DWORD dwIndex=0;
BOOL bFirst = TRUE;
tStopTime = time(NULL) + dwSeconds;
do {
if (!bFirst)
Sleep(1000);
else
bFirst = FALSE;
for (dwIndex = 0; dwIndex * MAXIMUM_WAIT_OBJECTS < nCount; dwIndex++) {
dwRet = WaitForMultipleObjects(
min(MAXIMUM_WAIT_OBJECTS, nCount - (dwIndex * MAXIMUM_WAIT_OBJECTS)),
lpHandles + (dwIndex * MAXIMUM_WAIT_OBJECTS),
0, 0);
if (dwRet != WAIT_TIMEOUT) {
break;
}
}
} while((time(NULL) < tStopTime) && (dwRet == WAIT_TIMEOUT));
return dwRet;
}
/*
* Signalling Apache on NT.
*
* Under Unix, Apache can be told to shutdown or restart by sending various
* signals (HUP, USR, TERM). On NT we don't have easy access to signals, so
* we use "events" instead. The parent apache process goes into a loop
* where it waits forever for a set of events. Two of those events are
* called
*
* apPID_shutdown
* apPID_restart
*
* (where PID is the PID of the apache parent process). When one of these
* is signalled, the Apache parent performs the appropriate action. The events
* can become signalled through internal Apache methods (e.g. if the child
* finds a fatal error and needs to kill its parent), via the service
* control manager (the control thread will signal the shutdown event when
* requested to stop the Apache service), from the -k Apache command line,
* or from any external program which finds the Apache PID from the
* httpd.pid file.
*
* The signal_parent() function, below, is used to signal one of these events.
* It can be called by any child or parent process, since it does not
* rely on global variables.
*
* On entry, type gives the event to signal. 0 means shutdown, 1 means
* graceful restart.
*/
/*
* Initialise the signal names, in the global variables signal_name_prefix,
* signal_restart_name and signal_shutdown_name.
*/
#define MAX_SIGNAL_NAME 30 /* Long enough for apPID_shutdown, where PID is an int */
char signal_name_prefix[MAX_SIGNAL_NAME];
char signal_restart_name[MAX_SIGNAL_NAME];
char signal_shutdown_name[MAX_SIGNAL_NAME];
void setup_signal_names(char *prefix)
{
apr_snprintf(signal_name_prefix, sizeof(signal_name_prefix), prefix);
apr_snprintf(signal_shutdown_name, sizeof(signal_shutdown_name),
"%s_shutdown", signal_name_prefix);
apr_snprintf(signal_restart_name, sizeof(signal_restart_name),
"%s_restart", signal_name_prefix);
}
static int volatile is_graceful = 0;
AP_DECLARE(int) ap_graceful_stop_signalled(void)
{
return is_graceful;
}
AP_DECLARE(void) ap_signal_parent(ap_signal_parent_e type)
{
HANDLE e;
char *signal_name;
if (parent_pid == my_pid) {
switch(type) {
case SIGNAL_PARENT_SHUTDOWN:
{
SetEvent(shutdown_event);
break;
}
/* This MPM supports only graceful restarts right now */
case SIGNAL_PARENT_RESTART:
case SIGNAL_PARENT_RESTART_GRACEFUL:
{
is_graceful = 1;
SetEvent(restart_event);
break;
}
}
return;
}
switch(type) {
case SIGNAL_PARENT_SHUTDOWN:
{
signal_name = signal_shutdown_name;
break;
}
/* This MPM supports only graceful restarts right now */
case SIGNAL_PARENT_RESTART:
case SIGNAL_PARENT_RESTART_GRACEFUL:
{
signal_name = signal_restart_name;
is_graceful = 1;
break;
}
default:
return;
}
e = OpenEvent(EVENT_MODIFY_STATE, FALSE, signal_name);
if (!e) {
/* Um, problem, can't signal the parent, which means we can't
* signal ourselves to die. Ignore for now...
*/
ap_log_error(APLOG_MARK, APLOG_EMERG, apr_get_os_error(), ap_server_conf,
"OpenEvent on %s event", signal_name);
return;
}
if (SetEvent(e) == 0) {
/* Same problem as above */
ap_log_error(APLOG_MARK, APLOG_EMERG, apr_get_os_error(), ap_server_conf,
"SetEvent on %s event", signal_name);
CloseHandle(e);
return;
}
CloseHandle(e);
}
/* set_listeners_noninheritable()
* Make the listening socket handles noninheritable by processes
* started out of this process.
*/
static int set_listeners_noninheritable(apr_pool_t *p)
{
ap_listen_rec *lr;
HANDLE dup;
SOCKET nsd;
HANDLE hProcess = GetCurrentProcess();
for (lr = ap_listeners; lr; lr = lr->next) {
apr_os_sock_get(&nsd,lr->sd);
if (!DuplicateHandle(hProcess, (HANDLE) nsd, hProcess, &dup,
0, FALSE, DUPLICATE_SAME_ACCESS)) {
ap_log_error(APLOG_MARK, APLOG_ERR, apr_get_os_error(), ap_server_conf,
"set_listeners_noninheritable: DuplicateHandle failed.");
}
else {
closesocket(nsd);
nsd = (SOCKET) dup;
apr_os_sock_put(&lr->sd, &nsd, p);
}
}
if (my_pid == parent_pid) {
ap_log_error(APLOG_MARK, APLOG_DEBUG | APLOG_NOERRNO, 0, ap_server_conf,
"Parent: Marked listeners as not inheritable.");
} else {
ap_log_error(APLOG_MARK, APLOG_DEBUG | APLOG_NOERRNO, 0, ap_server_conf,
"Child %d: Marked listeners as not inheritable.", my_pid);
}
return 1;
}
/*
* find_ready_listener()
* Only used by Win9* and should go away when the win9*_accept() function is
* reimplemented using apr_poll().
*/
static ap_listen_rec *head_listener;
static APR_INLINE ap_listen_rec *find_ready_listener(fd_set * main_fds)
{
ap_listen_rec *lr;
SOCKET nsd;
for (lr = head_listener; lr ; lr = lr->next) {
apr_os_sock_get(&nsd, lr->sd);
if (FD_ISSET(nsd, main_fds)) {
head_listener = lr->next;
if (head_listener == NULL)
head_listener = ap_listeners;
return (lr);
}
}
return NULL;
}
/*
*
*/
void get_handles_from_parent(server_rec *s)
{
HANDLE pipe;
HANDLE hScore;
DWORD BytesRead;
void *sb_shared;
apr_status_t rv;
pipe = GetStdHandle(STD_INPUT_HANDLE);
if (!ReadFile(pipe, &exit_event, sizeof(HANDLE),
&BytesRead, (LPOVERLAPPED) NULL)
|| (BytesRead != sizeof(HANDLE))) {
ap_log_error(APLOG_MARK, APLOG_CRIT, apr_get_os_error(), ap_server_conf,
"Child %d: Unable to retrieve the exit event from the parent", my_pid);
exit(APEXIT_CHILDINIT);
}
if (!ReadFile(pipe, &hScore, sizeof(hScore),
&BytesRead, (LPOVERLAPPED) NULL)
|| (BytesRead != sizeof(hScore))) {
ap_log_error(APLOG_MARK, APLOG_CRIT, apr_get_os_error(), ap_server_conf,
"Child %d: Unable to retrieve the scoreboard from the parent", my_pid);
exit(APEXIT_CHILDINIT);
}
if ((rv = apr_os_shm_put(&ap_scoreboard_shm, &hScore, s->process->pool))
!= APR_SUCCESS) {
ap_log_error(APLOG_MARK, APLOG_CRIT, rv, ap_server_conf,
"Child %d: Unable to access the scoreboard from the parent", my_pid);
exit(APEXIT_CHILDINIT);
}
rv = ap_reopen_scoreboard(s->process->pool, &ap_scoreboard_shm, 1);
if (rv || !(sb_shared = apr_shm_baseaddr_get(ap_scoreboard_shm))) {
ap_log_error(APLOG_MARK, APLOG_CRIT, rv, NULL,
"Child %d: Unable to reopen the scoreboard from the parent", my_pid);
exit(APEXIT_CHILDINIT);
}
/* We must 'initialize' the scoreboard to relink all the
* process-local pointer arrays into the shared memory block.
*/
ap_init_scoreboard(sb_shared);
ap_log_error(APLOG_MARK, APLOG_DEBUG | APLOG_NOERRNO, 0, ap_server_conf,
"Child %d: Retrieved our scoreboard from the parent.", my_pid);
}
/*
* get_listeners_from_parent()
* The listen sockets are opened in the parent. This function, which runs
* exclusively in the child process, receives them from the parent and
* makes them availeble in the child.
*/
void get_listeners_from_parent(server_rec *s)
{
WSAPROTOCOL_INFO WSAProtocolInfo;
HANDLE pipe;
ap_listen_rec *lr;
DWORD BytesRead;
int lcnt = 0;
SOCKET nsd;
/* Set up a default listener if necessary */
if (ap_listeners == NULL) {
ap_listen_rec *lr;
lr = apr_palloc(s->process->pool, sizeof(ap_listen_rec));
lr->sd = NULL;
lr->next = ap_listeners;
ap_listeners = lr;
}
/* Open the pipe to the parent process to receive the inherited socket
* data. The sockets have been set to listening in the parent process.
*/
pipe = GetStdHandle(STD_INPUT_HANDLE);
for (lr = ap_listeners; lr; lr = lr->next, ++lcnt) {
if (!ReadFile(pipe, &WSAProtocolInfo, sizeof(WSAPROTOCOL_INFO),
&BytesRead, (LPOVERLAPPED) NULL)) {
ap_log_error(APLOG_MARK, APLOG_CRIT, apr_get_os_error(), ap_server_conf,
"setup_inherited_listeners: Unable to read socket data from parent");
exit(APEXIT_CHILDINIT);
}
nsd = WSASocket(FROM_PROTOCOL_INFO, FROM_PROTOCOL_INFO, FROM_PROTOCOL_INFO,
&WSAProtocolInfo, 0, 0);
if (nsd == INVALID_SOCKET) {
ap_log_error(APLOG_MARK, APLOG_CRIT, apr_get_netos_error(), ap_server_conf,
"Child %d: setup_inherited_listeners(), WSASocket failed to open the inherited socket.", my_pid);
exit(APEXIT_CHILDINIT);
}
apr_os_sock_put(&lr->sd, &nsd, s->process->pool);
}
ap_log_error(APLOG_MARK, APLOG_DEBUG | APLOG_NOERRNO, 0, ap_server_conf,
"Child %d: retrieved %d listeners from parent", my_pid, lcnt);
if (!set_listeners_noninheritable(s->process->pool)) {
exit(APEXIT_CHILDINIT);
}
}
/* Windows 9x specific code...
* Accept processing for on Windows 95/98 uses a producer/consumer queue
* model. A single thread accepts connections and queues the accepted socket
* to the accept queue for consumption by a pool of worker threads.
*
* win9x_accept()
* The accept threads runs this function, which accepts connections off
* the network and calls add_job() to queue jobs to the accept_queue.
* add_job()/remove_job()
* Add or remove an accepted socket from the list of sockets
* connected to clients. allowed_globals.jobmutex protects
* against multiple concurrent access to the linked list of jobs.
* win9x_get_connection()
* Calls remove_job() to pull a job from the accept queue. All the worker
* threads block on remove_job.
*/
typedef struct joblist_s {
struct joblist_s *next;
int sock;
} joblist;
typedef struct globals_s {
HANDLE jobsemaphore;
joblist *jobhead;
joblist *jobtail;
apr_thread_mutex_t *jobmutex;
int jobcount;
} globals;
globals allowed_globals = {NULL, NULL, NULL, NULL, 0};
#define MAX_SELECT_ERRORS 100
static void add_job(int sock)
{
joblist *new_job;
new_job = (joblist *) malloc(sizeof(joblist));
if (new_job == NULL) {
ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL,
"Ouch! Out of memory in add_job()!");
return;
}
new_job->next = NULL;
new_job->sock = sock;
apr_thread_mutex_lock(allowed_globals.jobmutex);
if (allowed_globals.jobtail != NULL)
allowed_globals.jobtail->next = new_job;
allowed_globals.jobtail = new_job;
if (!allowed_globals.jobhead)
allowed_globals.jobhead = new_job;
allowed_globals.jobcount++;
ReleaseSemaphore(allowed_globals.jobsemaphore, 1, NULL);
apr_thread_mutex_unlock(allowed_globals.jobmutex);
}
static int remove_job(void)
{
joblist *job;
int sock;
WaitForSingleObject(allowed_globals.jobsemaphore, INFINITE);
apr_thread_mutex_lock(allowed_globals.jobmutex);
if (shutdown_in_progress && !allowed_globals.jobhead) {
apr_thread_mutex_unlock(allowed_globals.jobmutex);
return (-1);
}
job = allowed_globals.jobhead;
ap_assert(job);
allowed_globals.jobhead = job->next;
if (allowed_globals.jobhead == NULL)
allowed_globals.jobtail = NULL;
apr_thread_mutex_unlock(allowed_globals.jobmutex);
sock = job->sock;
free(job);
return (sock);
}
static void win9x_accept(void * dummy)
{
struct timeval tv;
fd_set main_fds;
int wait_time = 1;
int csd;
SOCKET nsd = INVALID_SOCKET;
struct sockaddr_in sa_client;
int count_select_errors = 0;
int rc;
int clen;
ap_listen_rec *lr;
struct fd_set listenfds;
SOCKET listenmaxfd = INVALID_SOCKET;
/* Setup the listeners
* ToDo: Use apr_poll()
*/
FD_ZERO(&listenfds);
for (lr = ap_listeners; lr; lr = lr->next) {
if (lr->sd != NULL) {
apr_os_sock_get(&nsd, lr->sd);
FD_SET(nsd, &listenfds);
if (listenmaxfd == INVALID_SOCKET || nsd > listenmaxfd) {
listenmaxfd = nsd;
}
}
}
head_listener = ap_listeners;
while (!shutdown_in_progress) {
tv.tv_sec = wait_time;
tv.tv_usec = 0;
memcpy(&main_fds, &listenfds, sizeof(fd_set));
rc = select(listenmaxfd + 1, &main_fds, NULL, NULL, &tv);
if (rc == 0 || (rc == SOCKET_ERROR && APR_STATUS_IS_EINTR(apr_get_netos_error()))) {
count_select_errors = 0; /* reset count of errors */
continue;
}
else if (rc == SOCKET_ERROR) {
/* A "real" error occurred, log it and increment the count of
* select errors. This count is used to ensure we don't go into
* a busy loop of continuous errors.
*/
ap_log_error(APLOG_MARK, APLOG_INFO, apr_get_netos_error(), ap_server_conf,
"select failed with error %d", apr_get_netos_error());
count_select_errors++;
if (count_select_errors > MAX_SELECT_ERRORS) {
shutdown_in_progress = 1;
ap_log_error(APLOG_MARK, APLOG_ERR, apr_get_netos_error(), ap_server_conf,
"Too many errors in select loop. Child process exiting.");
break;
}
} else {
ap_listen_rec *lr;
lr = find_ready_listener(&main_fds);
if (lr != NULL) {
/* fetch the native socket descriptor */
apr_os_sock_get(&nsd, lr->sd);
}
}
do {
clen = sizeof(sa_client);
csd = accept(nsd, (struct sockaddr *) &sa_client, &clen);
if (csd == INVALID_SOCKET) {
csd = -1;
}
} while (csd < 0 && APR_STATUS_IS_EINTR(apr_get_netos_error()));
if (csd < 0) {
if (APR_STATUS_IS_ECONNABORTED(apr_get_netos_error())) {
ap_log_error(APLOG_MARK, APLOG_ERR, apr_get_netos_error(), ap_server_conf,
"accept: (client socket)");
}
}
else {
add_job(csd);
}
}
SetEvent(exit_event);
}
static PCOMP_CONTEXT win9x_get_connection(PCOMP_CONTEXT context)
{
int len;
if (context == NULL) {
/* allocate the completion context and the transaction pool */
context = apr_pcalloc(pconf, sizeof(COMP_CONTEXT));
apr_pool_create(&context->ptrans, pconf);
apr_pool_tag(context->ptrans, "ptrans");
}
while (1) {
apr_pool_clear(context->ptrans);
context->accept_socket = remove_job();
if (context->accept_socket == -1) {
return NULL;
}
len = sizeof(struct sockaddr);
context->sa_server = apr_palloc(context->ptrans, len);
if (getsockname(context->accept_socket,
context->sa_server, &len)== SOCKET_ERROR) {
ap_log_error(APLOG_MARK, APLOG_WARNING, apr_get_netos_error(), ap_server_conf,
"getsockname failed");
continue;
}
len = sizeof(struct sockaddr);
context->sa_client = apr_palloc(context->ptrans, len);
if ((getpeername(context->accept_socket,
context->sa_client, &len)) == SOCKET_ERROR) {
ap_log_error(APLOG_MARK, APLOG_WARNING, apr_get_netos_error(), ap_server_conf,
"getpeername failed");
memset(&context->sa_client, '\0', sizeof(context->sa_client));
}
/* do we NEED_DUPPED_CSD ?? */
return context;
}
}
/* Windows NT/2000 specific code...
* Accept processing for on Windows NT uses a producer/consumer queue
* model. An accept thread accepts connections off the network then issues
* PostQueuedCompletionStatus() to awake a thread blocked on the ThreadDispatch
* IOCompletionPort.
*
* winnt_accept()
* One or more accept threads run in this function, each of which accepts
* connections off the network and calls PostQueuedCompletionStatus() to
* queue an io completion packet to the ThreadDispatch IOCompletionPort.
* winnt_get_connection()
* Worker threads block on the ThreadDispatch IOCompletionPort awaiting
* connections to service.
*/
static void winnt_accept(void *listen_socket)
{
PCOMP_CONTEXT pCompContext;
DWORD BytesRead;
SOCKET nlsd;
int lasterror;
nlsd = (SOCKET) listen_socket;
while (!shutdown_in_progress) {
pCompContext = mpm_get_completion_context();
if (!pCompContext) {
/* Hopefully whatever is preventing us from getting a
* completion context is a temporary resource constraint.
*/
Sleep(750);
continue;
}
again:
/* Create and initialize the accept socket */
if (pCompContext->accept_socket == INVALID_SOCKET) {
pCompContext->accept_socket = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
if (pCompContext->accept_socket == INVALID_SOCKET) {
/* Hopefully another temporary condition. Be graceful. */
ap_log_error(APLOG_MARK,APLOG_WARNING, apr_get_netos_error(), ap_server_conf,
"winnt_accept: Failed to allocate an accept socket. "
"Temporary resource constraint? Try again.");
Sleep(500);
goto again;
}
}
/* AcceptEx on the completion context. The completion context will be
* signaled when a connection is accepted.
*/
if (!AcceptEx(nlsd, pCompContext->accept_socket,
pCompContext->buff,
0,
PADDED_ADDR_SIZE,
PADDED_ADDR_SIZE,
&BytesRead,
&pCompContext->Overlapped)) {
lasterror = apr_get_netos_error();
if (lasterror == APR_FROM_OS_ERROR(WSAEINVAL)) {
/* Hack alert. Occasionally, TransmitFile will not recycle the
* accept socket (usually when the client disconnects early).
* Get a new socket and try the call again.
*/
closesocket(pCompContext->accept_socket);
pCompContext->accept_socket = INVALID_SOCKET;
ap_log_error(APLOG_MARK, APLOG_DEBUG, lasterror, ap_server_conf,
"winnt_accept: AcceptEx failed due to early client "
"disconnect. Reallocate the accept socket and try again.");
if (shutdown_in_progress)
break;
else
goto again;
}
else if (lasterror != APR_FROM_OS_ERROR(ERROR_IO_PENDING)) {
ap_log_error(APLOG_MARK,APLOG_ERR, lasterror, ap_server_conf,
"winnt_accept: AcceptEx failed. Attempting to recover.");
closesocket(pCompContext->accept_socket);
pCompContext->accept_socket = INVALID_SOCKET;
Sleep(500);
goto again;
}
/* Wait for pending i/o */
WaitForSingleObject(pCompContext->Overlapped.hEvent, INFINITE);
}
/* Inherit the listen socket settings. Required for
* shutdown() to work
*/
if (setsockopt(pCompContext->accept_socket, SOL_SOCKET,
SO_UPDATE_ACCEPT_CONTEXT, (char *)&nlsd,
sizeof(nlsd))) {
ap_log_error(APLOG_MARK, APLOG_WARNING, apr_get_netos_error(), ap_server_conf,
"setsockopt(SO_UPDATE_ACCEPT_CONTEXT) failed.");
/* Not a failure condition. Keep running. */
}
/* Get the local & remote address */
GetAcceptExSockaddrs(pCompContext->buff,
0,
PADDED_ADDR_SIZE,
PADDED_ADDR_SIZE,
&pCompContext->sa_server,
&pCompContext->sa_server_len,
&pCompContext->sa_client,
&pCompContext->sa_client_len);
/* When a connection is received, send an io completion notification to
* the ThreadDispatchIOCP. This function could be replaced by
* mpm_post_completion_context(), but why do an extra function call...
*/
PostQueuedCompletionStatus(ThreadDispatchIOCP, 0, IOCP_CONNECTION_ACCEPTED,
&pCompContext->Overlapped);
}
if (!shutdown_in_progress) {
/* Yow, hit an irrecoverable error! Tell the child to die. */
SetEvent(exit_event);
}
}
static PCOMP_CONTEXT winnt_get_connection(PCOMP_CONTEXT pCompContext)
{
int rc;
DWORD BytesRead;
DWORD CompKey;
LPOVERLAPPED pol;
mpm_recycle_completion_context(pCompContext);
g_blocked_threads++;
while (1) {
if (workers_may_exit) {
g_blocked_threads--;
return NULL;
}
rc = GetQueuedCompletionStatus(ThreadDispatchIOCP, &BytesRead, &CompKey,
&pol, INFINITE);
if (!rc) {
rc = apr_get_os_error();
ap_log_error(APLOG_MARK,APLOG_DEBUG, rc, ap_server_conf,
"Child %d: GetQueuedComplationStatus returned %d", my_pid, rc);
continue;
}
switch (CompKey) {
case IOCP_CONNECTION_ACCEPTED:
pCompContext = CONTAINING_RECORD(pol, COMP_CONTEXT, Overlapped);
break;
case IOCP_SHUTDOWN:
g_blocked_threads--;
return NULL;
default:
g_blocked_threads--;
return NULL;
}
break;
}
g_blocked_threads--;
if ((rc = apr_pool_create(&pCompContext->ptrans, pconf)) != APR_SUCCESS) {
ap_log_error(APLOG_MARK,APLOG_DEBUG, rc, ap_server_conf,
"Child %d: apr_pool_create failed with rc %d", my_pid, rc);
} else {
apr_pool_tag(pCompContext->ptrans, "ptrans");
}
return pCompContext;
}
/*
* worker_main()
* Main entry point for the worker threads. Worker threads block in
* win*_get_connection() awaiting a connection to service.
*/
static void worker_main(long thread_num)
{
static int requests_this_child = 0;
PCOMP_CONTEXT context = NULL;
apr_bucket_alloc_t *bucket_alloc;
apr_os_sock_info_t sockinfo;
ap_sb_handle_t *sbh;
while (1) {
conn_rec *c;
apr_int32_t disconnected;
ap_update_child_status_from_indexes(0, thread_num, SERVER_READY,
(request_rec *) NULL);
/* Grab a connection off the network */
if (osver.dwPlatformId == VER_PLATFORM_WIN32_WINDOWS) {
context = win9x_get_connection(context);
}
else {
context = winnt_get_connection(context);
}
if (!context) {
/* Time for the thread to exit */
break;
}
/* XXX: where does this go? */
bucket_alloc = apr_bucket_alloc_create(context->ptrans);
/* Have we hit MaxRequestPerChild connections? */
if (ap_max_requests_per_child) {
requests_this_child++;
if (requests_this_child > ap_max_requests_per_child) {
SetEvent(max_requests_per_child_event);
}
}
sockinfo.os_sock = &context->accept_socket;
sockinfo.local = context->sa_server;
sockinfo.remote = context->sa_client;
sockinfo.family = APR_INET;
sockinfo.type = SOCK_STREAM;
/* ### is this correct? Shouldn't be inheritable (at this point) */
apr_os_sock_make(&context->sock, &sockinfo, context->ptrans);
ap_create_sb_handle(&sbh, context->ptrans, 0, thread_num);
c = ap_run_create_connection(context->ptrans, ap_server_conf,
context->sock, thread_num, sbh,
bucket_alloc);
if (c) {
ap_process_connection(c, context->sock);
apr_getsocketopt(context->sock, APR_SO_DISCONNECTED, &disconnected);
if (!disconnected) {
context->accept_socket = INVALID_SOCKET;
ap_lingering_close(c);
}
}
else {
/* ap_run_create_connection closes the socket on failure */
context->accept_socket = INVALID_SOCKET;
}
}
ap_update_child_status_from_indexes(0, thread_num, SERVER_DEAD,
(request_rec *) NULL);
ap_log_error(APLOG_MARK, APLOG_INFO, APR_SUCCESS, ap_server_conf,
"Child %d: Thread exiting.", my_pid);
}
static void cleanup_thread(thread *handles, int *thread_cnt, int thread_to_clean)
{
int i;
CloseHandle(handles[thread_to_clean]);
for (i = thread_to_clean; i < ((*thread_cnt) - 1); i++)
handles[i] = handles[i + 1];
(*thread_cnt)--;
}
/*
* child_main()
* Entry point for the main control thread for the child process.
* This thread creates the accept thread, worker threads and
* monitors the child process for maintenance and shutdown
* events.
*/
static void child_main()
{
apr_status_t status;
ap_listen_rec *lr;
HANDLE child_events[2];
int nthreads = ap_threads_per_child;
int tid;
thread *child_handles;
int rv;
time_t end_time;
int i;
int cld;
apr_pool_create(&pchild, pconf);
apr_pool_tag(pchild, "pchild");
ap_run_child_init(pchild, ap_server_conf);
/* Initialize the child_events */
max_requests_per_child_event = CreateEvent(NULL, TRUE, FALSE, NULL);
if (!max_requests_per_child_event) {
ap_log_error(APLOG_MARK, APLOG_CRIT, apr_get_os_error(), ap_server_conf,
"Child %d: Failed to create a max_requests event.", my_pid);
exit(APEXIT_CHILDINIT);
}
child_events[0] = exit_event;
child_events[1] = max_requests_per_child_event;
allowed_globals.jobsemaphore = CreateSemaphore(NULL, 0, 1000000, NULL);
apr_thread_mutex_create(&allowed_globals.jobmutex,
APR_THREAD_MUTEX_DEFAULT, pchild);
/*
* Wait until we have permission to start accepting connections.
* start_mutex is used to ensure that only one child ever
* goes into the listen/accept loop at once.
*/
status = apr_proc_mutex_lock(start_mutex);
if (status != APR_SUCCESS) {
ap_log_error(APLOG_MARK,APLOG_ERR, status, ap_server_conf,
"Child %d: Failed to acquire the start_mutex. Process will exit.", my_pid);
exit(APEXIT_CHILDINIT);
}
ap_log_error(APLOG_MARK,APLOG_INFO, APR_SUCCESS, ap_server_conf,
"Child %d: Acquired the start mutex.", my_pid);
/*
* Create the worker thread dispatch IOCompletionPort
* on Windows NT/2000
*/
if (osver.dwPlatformId != VER_PLATFORM_WIN32_WINDOWS) {
/* Create the worker thread dispatch IOCP */
ThreadDispatchIOCP = CreateIoCompletionPort(INVALID_HANDLE_VALUE,
NULL,
0,
0); /* CONCURRENT ACTIVE THREADS */
apr_thread_mutex_create(&qlock, APR_THREAD_MUTEX_DEFAULT, pchild);
}
/*
* Create the pool of worker threads
*/
ap_log_error(APLOG_MARK,APLOG_INFO, APR_SUCCESS, ap_server_conf,
"Child %d: Starting %d worker threads.", my_pid, nthreads);
child_handles = (thread) alloca(nthreads * sizeof(int));
for (i = 0; i < nthreads; i++) {
ap_update_child_status_from_indexes(0, i, SERVER_STARTING,
(request_rec *) NULL);
child_handles[i] = (thread) _beginthreadex(NULL, 0, (LPTHREAD_START_ROUTINE) worker_main,
(void *) i, 0, &tid);
}
/*
* Start the accept thread
*/
if (osver.dwPlatformId == VER_PLATFORM_WIN32_WINDOWS) {
_beginthreadex(NULL, 0, (LPTHREAD_START_ROUTINE) win9x_accept,
(void *) i, 0, &tid);
} else {
/* Start an accept thread per listener */
SOCKET nlsd; /* native listening sock descriptor */
ap_listen_rec *lr;
for (lr = ap_listeners; lr; lr = lr->next) {
if (lr->sd != NULL) {
apr_os_sock_get(&nlsd, lr->sd);
_beginthreadex(NULL, 1000, (LPTHREAD_START_ROUTINE) winnt_accept,
(void *) nlsd, 0, &tid);
}
}
}
/* Wait for one of three events:
* exit_event:
* The exit_event is signaled by the parent process to notify
* the child that it is time to exit.
*
* max_requests_per_child_event:
* This event is signaled by the worker threads to indicate that
* the process has handled MaxRequestsPerChild connections.
*
* TIMEOUT:
* To do periodic maintenance on the server (check for thread exits,
* number of completion contexts, etc.)
*/
while (1) {
rv = WaitForMultipleObjects(2, (HANDLE *) child_events, FALSE, 1000);
cld = rv - WAIT_OBJECT_0;
if (rv == WAIT_FAILED) {
/* Something serious is wrong */
ap_log_error(APLOG_MARK, APLOG_CRIT, apr_get_os_error(), ap_server_conf,
"Child %d: WAIT_FAILED -- shutting down server");
break;
}
else if (rv == WAIT_TIMEOUT) {
apr_proc_other_child_check();
}
else if (cld == 0) {
/* Exit event was signaled */
ap_log_error(APLOG_MARK, APLOG_INFO, APR_SUCCESS, ap_server_conf,
"Child %d: Exit event signaled. Child process is ending.", my_pid);
break;
}
else {
/* MaxRequestsPerChild event set by the worker threads.
* Signal the parent to restart
*/
ap_log_error(APLOG_MARK, APLOG_INFO, APR_SUCCESS, ap_server_conf,
"Child %d: Process exiting because it reached "
"MaxRequestsPerChild. Signaling the parent to "
"restart a new child process.", my_pid);
ap_signal_parent(SIGNAL_PARENT_RESTART);
break;
}
}
/* Setting is_graceful will cause keep-alive connections to be closed
* rather than block on the next network read.
*/
is_graceful = 1;
/* Setting shutdown_in_progress prevents new connections from
* being accepted but allows the worker threads to continue
* handling connections that have already been accepted.
*/
shutdown_in_progress = 1;
/* Close the listening sockets. */
for (lr = ap_listeners; lr ; lr = lr->next) {
apr_socket_close(lr->sd);
}
Sleep(1000);
/* Release the start_mutex to let the new process (in the restart
* scenario) a chance to begin accepting and servicing requests
*/
rv = apr_proc_mutex_unlock(start_mutex);
if (rv == APR_SUCCESS) {
ap_log_error(APLOG_MARK,APLOG_INFO | APLOG_NOERRNO, rv, ap_server_conf,
"Child %d: Released the start mutex", my_pid);
}
else {
ap_log_error(APLOG_MARK,APLOG_ERR, rv, ap_server_conf,
"Child %d: Failure releasing the start mutex", my_pid);
}
/* Tell the worker threads they may exit when done handling
* a connection.
*/
workers_may_exit = 1;
/* Shutdown the worker threads */
if (osver.dwPlatformId == VER_PLATFORM_WIN32_WINDOWS) {
for (i = 0; i < nthreads; i++) {
add_job(-1);
}
}
else { /* Windows NT/2000 */
/* Post worker threads blocked on the ThreadDispatch IOCompletion port */
while (g_blocked_threads > 0) {
ap_log_error(APLOG_MARK,APLOG_INFO, APR_SUCCESS, ap_server_conf,
"Child %d: %d threads blocked on the completion port", my_pid, g_blocked_threads);
for (i=g_blocked_threads; i > 0; i--) {
PostQueuedCompletionStatus(ThreadDispatchIOCP, 0, IOCP_SHUTDOWN, NULL);
}
Sleep(1000);
}
/* Empty the accept queue of completion contexts */
apr_thread_mutex_lock(qlock);
while (qhead) {
CloseHandle(qhead->Overlapped.hEvent);
closesocket(qhead->accept_socket);
qhead = qhead->next;
}
apr_thread_mutex_unlock(qlock);
}
/* Give busy worker threads a chance to service their connections */
ap_log_error(APLOG_MARK,APLOG_INFO, APR_SUCCESS, ap_server_conf,
"Child %d: Waiting for %d threads to die.", my_pid, nthreads);
end_time = time(NULL) + 180;
while (nthreads) {
rv = wait_for_many_objects(nthreads, child_handles, end_time - time(NULL));
if (rv != WAIT_TIMEOUT) {
rv = rv - WAIT_OBJECT_0;
ap_assert((rv >= 0) && (rv < nthreads));
cleanup_thread(child_handles, &nthreads, rv);
continue;
}
break;
}
/* Kill remaining threads off the hard way */
for (i = 0; i < nthreads; i++) {
TerminateThread(child_handles[i], 1);
CloseHandle(child_handles[i]);
}
ap_log_error(APLOG_MARK,APLOG_DEBUG, APR_SUCCESS, ap_server_conf,
"Child %d: All worker threads have ended.", my_pid);
CloseHandle(allowed_globals.jobsemaphore);
apr_thread_mutex_destroy(allowed_globals.jobmutex);
if (osver.dwPlatformId != VER_PLATFORM_WIN32_WINDOWS)
apr_thread_mutex_destroy(qlock);
apr_pool_destroy(pchild);
CloseHandle(exit_event);
}
static int send_handles_to_child(apr_pool_t *p, HANDLE child_exit_event, HANDLE hProcess, HANDLE hPipeWrite)
{
apr_status_t rv;
HANDLE hScore;
HANDLE hDup;
HANDLE hCurrentProcess = GetCurrentProcess();
DWORD BytesWritten;
if (!DuplicateHandle(hCurrentProcess, child_exit_event, hProcess, &hDup,
EVENT_MODIFY_STATE | SYNCHRONIZE, FALSE, 0)) {
ap_log_error(APLOG_MARK, APLOG_CRIT, apr_get_os_error(), ap_server_conf,
"Parent: Unable to duplicate the exit event handle for the child");
return -1;
}
if (!WriteFile(hPipeWrite, &hDup, sizeof(hDup),
&BytesWritten, (LPOVERLAPPED) NULL)
|| (BytesWritten != sizeof(hDup))) {
ap_log_error(APLOG_MARK, APLOG_CRIT, apr_get_os_error(), ap_server_conf,
"Parent: Unable to send the exit event handle to the child");
return -1;
}
if ((rv = apr_os_shm_get(&hScore, ap_scoreboard_shm)) != APR_SUCCESS) {
ap_log_error(APLOG_MARK, APLOG_CRIT, rv, ap_server_conf,
"Parent: Unable to retrieve the scoreboard handle for the child");
return -1;
}
if (!DuplicateHandle(hCurrentProcess, hScore, hProcess, &hDup,
FILE_MAP_READ | FILE_MAP_WRITE, FALSE, 0)) {
ap_log_error(APLOG_MARK, APLOG_CRIT, apr_get_os_error(), ap_server_conf,
"Parent: Unable to duplicate the scoreboard handle to the child");
return -1;
}
if (!WriteFile(hPipeWrite, &hDup, sizeof(hDup),
&BytesWritten, (LPOVERLAPPED) NULL)
|| (BytesWritten != sizeof(hDup))) {
ap_log_error(APLOG_MARK, APLOG_CRIT, apr_get_os_error(), ap_server_conf,
"Parent: Unable to send the scoreboard handle to the child");
return -1;
}
ap_log_error(APLOG_MARK, APLOG_DEBUG | APLOG_NOERRNO, 0, ap_server_conf,
"Parent: Sent the scoreboard to the child");
return 0;
}
static int send_listeners_to_child(apr_pool_t *p, DWORD dwProcessId, HANDLE hPipeWrite)
{
int lcnt = 0;
ap_listen_rec *lr;
LPWSAPROTOCOL_INFO lpWSAProtocolInfo;
DWORD BytesWritten;
/* Run the chain of open sockets. For each socket, duplicate it
* for the target process then send the WSAPROTOCOL_INFO
* (returned by dup socket) to the child.
*/
for (lr = ap_listeners; lr; lr = lr->next, ++lcnt) {
int nsd;
lpWSAProtocolInfo = apr_pcalloc(p, sizeof(WSAPROTOCOL_INFO));
apr_os_sock_get(&nsd,lr->sd);
ap_log_error(APLOG_MARK, APLOG_INFO, APR_SUCCESS, ap_server_conf,
"Parent: Duplicating socket %d and sending it to child process %d",
nsd, dwProcessId);
if (WSADuplicateSocket(nsd, dwProcessId,
lpWSAProtocolInfo) == SOCKET_ERROR) {
ap_log_error(APLOG_MARK, APLOG_CRIT, apr_get_netos_error(), ap_server_conf,
"Parent: WSADuplicateSocket failed for socket %d. Check the FAQ.", lr->sd );
return -1;
}
if (!WriteFile(hPipeWrite, lpWSAProtocolInfo, (DWORD) sizeof(WSAPROTOCOL_INFO),
&BytesWritten,
(LPOVERLAPPED) NULL)
|| BytesWritten != sizeof(WSAPROTOCOL_INFO)) {
ap_log_error(APLOG_MARK, APLOG_CRIT, apr_get_os_error(), ap_server_conf,
"Parent: Unable to write duplicated socket %d to the child.", lr->sd );
return -1;
}
}
ap_log_error(APLOG_MARK, APLOG_DEBUG | APLOG_NOERRNO, 0, ap_server_conf,
"Parent: Sent %d listeners to child %d", lcnt, dwProcessId);
return 0;
}
static int create_process(apr_pool_t *p, HANDLE *child_proc, HANDLE *child_exit_event)
{
int rv;
char buf[1024];
char *pCommand;
char *pEnvVar;
char *pEnvBlock;
int i;
int iEnvBlockLen;
STARTUPINFO si; /* Filled in prior to call to CreateProcess */
PROCESS_INFORMATION pi; /* filled in on call to CreateProcess */
HANDLE hDup;
HANDLE hPipeRead;
HANDLE hPipeWrite;
HANDLE hNullOutput;
HANDLE hShareError;
HANDLE hExitEvent;
HANDLE hCurrentProcess = GetCurrentProcess();
SECURITY_ATTRIBUTES sa;
sa.nLength = sizeof(sa);
sa.bInheritHandle = TRUE;
sa.lpSecurityDescriptor = NULL;
/* Build the command line. Should look something like this:
* C:/apache/bin/apache.exe -f ap_server_confname
* First, get the path to the executable...
*/
rv = GetModuleFileName(NULL, buf, sizeof(buf));
if (rv == sizeof(buf)) {
ap_log_error(APLOG_MARK, APLOG_CRIT, ERROR_BAD_PATHNAME, ap_server_conf,
"Parent: Path to Apache process too long");
return -1;
} else if (rv == 0) {
ap_log_error(APLOG_MARK, APLOG_CRIT, apr_get_os_error(), ap_server_conf,
"Parent: GetModuleFileName() returned NULL for current process.");
return -1;
}
/* Build the command line */
pCommand = apr_psprintf(p, "\"%s\"", buf);
for (i = 1; i < ap_server_conf->process->argc; i++) {
pCommand = apr_pstrcat(p, pCommand, " \"", ap_server_conf->process->argv[i], "\"", NULL);
}
/* Create a pipe to send socket info to the child */
if (!CreatePipe(&hPipeRead, &hPipeWrite, &sa, 0)) {
ap_log_error(APLOG_MARK, APLOG_CRIT, apr_get_os_error(), ap_server_conf,
"Parent: Unable to create pipe to child process.");
return -1;
}
/* Make our end of the handle non-inherited */
if (DuplicateHandle(hCurrentProcess, hPipeWrite, hCurrentProcess,
&hDup, 0, FALSE, DUPLICATE_SAME_ACCESS)) {
CloseHandle(hPipeWrite);
hPipeWrite = hDup;
}
else {
ap_log_error(APLOG_MARK, APLOG_CRIT, apr_get_os_error(), ap_server_conf,
"Parent: Unable to duplicate pipe to child.\n");
CloseHandle(hPipeWrite);
CloseHandle(hPipeRead);
return -1;
}
/* Open a null handle to soak info from the child */
hNullOutput = CreateFile("nul", GENERIC_READ | GENERIC_WRITE,
FILE_SHARE_READ | FILE_SHARE_WRITE,
&sa, OPEN_EXISTING, 0, NULL);
if (hNullOutput == INVALID_HANDLE_VALUE) {
ap_log_error(APLOG_MARK, APLOG_CRIT, apr_get_os_error(), ap_server_conf,
"Parent: Unable to create null output pipe for child process.\n");
CloseHandle(hPipeWrite);
CloseHandle(hPipeRead);
return -1;
}
/* Child's initial stderr -> our main server error log (or, failing that, stderr) */
if (ap_server_conf->error_log) { /* Is this check really necessary?*/
rv = apr_os_file_get(&hShareError, ap_server_conf->error_log);
if (rv == APR_SUCCESS && hShareError != INVALID_HANDLE_VALUE) {
if (DuplicateHandle(hCurrentProcess, hShareError,
hCurrentProcess, &hDup,
GENERIC_WRITE, TRUE, 0)) {
hShareError = hDup;
}
else {
rv = apr_get_os_error();
}
}
if (rv != APR_SUCCESS) {
ap_log_error(APLOG_MARK, APLOG_CRIT, rv, ap_server_conf,
"Parent: Unable to share error log with child.\n");
CloseHandle(hPipeWrite);
CloseHandle(hPipeRead);
CloseHandle(hNullOutput);
return -1;
}
else if (hShareError == INVALID_HANDLE_VALUE) {
ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_CRIT, 0, ap_server_conf,
"Parent: Failed to share error log with child.\n");
CloseHandle(hPipeWrite);
CloseHandle(hPipeRead);
CloseHandle(hNullOutput);
return -1;
}
}
else {
hShareError = GetStdHandle(STD_ERROR_HANDLE);
}
/* Create the child_exit_event */
hExitEvent = CreateEvent(NULL, TRUE, FALSE, NULL);
if (!hExitEvent) {
ap_log_error(APLOG_MARK, APLOG_CRIT, apr_get_os_error(), ap_server_conf,
"Parent: Could not create exit event for child process");
CloseHandle(hPipeWrite);
CloseHandle(hPipeRead);
CloseHandle(hNullOutput);
if (GetStdHandle(STD_ERROR_HANDLE) != hShareError) {
CloseHandle(hShareError);
}
return -1;
}
/*
* Build the environment
* Win32's CreateProcess call requires that the environment
* be passed in an environment block, a null terminated block of
* null terminated strings.
*/
_putenv(apr_psprintf(p,"AP_PARENT_PID=%i", parent_pid));
_putenv(apr_psprintf(p,"AP_MY_GENERATION=%i", ap_my_generation));
i = 0;
iEnvBlockLen = 1;
while (_environ[i]) {
iEnvBlockLen += strlen(_environ[i]) + 1;
i++;
}
pEnvBlock = (char *)apr_pcalloc(p, iEnvBlockLen);
pEnvVar = pEnvBlock;
i = 0;
while (_environ[i]) {
strcpy(pEnvVar, _environ[i]);
pEnvVar = strchr(pEnvVar, '\0') + 1;
i++;
}
pEnvVar = '\0';
/* Give the read end of the pipe (hPipeRead) to the child as stdin. The
* parent will write the socket data to the child on this pipe.
*/
memset(&si, 0, sizeof(si));
memset(&pi, 0, sizeof(pi));
si.cb = sizeof(si);
si.dwFlags = STARTF_USESHOWWINDOW | STARTF_USESTDHANDLES;
si.wShowWindow = SW_HIDE;
si.hStdInput = hPipeRead;
si.hStdOutput = hNullOutput;
si.hStdError = hShareError;
rv = CreateProcess(NULL, pCommand, NULL, NULL,
TRUE, /* Inherit handles */
0, /* Creation flags */
pEnvBlock, /* Environment block */
NULL,
&si, &pi);
/* Undo everything created for the child alone
*/
CloseHandle(pi.hThread);
CloseHandle(hPipeRead);
CloseHandle(hNullOutput);
if (GetStdHandle(STD_ERROR_HANDLE) != hShareError) {
/* Handles opened with GetStdHandle are psuedo handles
* and should not be closed else bad things will happen.
*/
CloseHandle(hShareError);
}
_putenv("AP_PARENT_PID=");
_putenv("AP_MY_GENERATION=");
if (!rv) {
ap_log_error(APLOG_MARK, APLOG_CRIT, apr_get_os_error(), ap_server_conf,
"Parent: Failed to create the child process.");
CloseHandle(hExitEvent);
CloseHandle(hPipeWrite);
CloseHandle(pi.hProcess);
return -1;
}
ap_log_error(APLOG_MARK, APLOG_INFO, APR_SUCCESS, ap_server_conf,
"Parent: Created child process %d", pi.dwProcessId);
if (send_handles_to_child(p, hExitEvent, pi.hProcess, hPipeWrite)) {
/*
* This error is fatal, mop up the child and move on
* We toggle the child's exit event to cause this child
* to quit even as it is attempting to start.
*/
SetEvent(hExitEvent);
CloseHandle(hExitEvent);
CloseHandle(hPipeWrite);
CloseHandle(pi.hProcess);
return -1;
}
/* Important:
* Give the child process a chance to run before dup'ing the sockets.
* We have already set the listening sockets noninheritable, but if
* WSADuplicateSocket runs before the child process initializes
* the listeners will be inherited anyway.
*
* XXX: This is badness; needs some mutex interlocking
*/
Sleep(1000);
if (send_listeners_to_child(p, pi.dwProcessId, hPipeWrite)) {
/*
* This error is fatal, mop up the child and move on
* We toggle the child's exit event to cause this child
* to quit even as it is attempting to start.
*/
SetEvent(hExitEvent);
CloseHandle(hExitEvent);
CloseHandle(hPipeWrite);
CloseHandle(pi.hProcess);
return -1;
}
CloseHandle(hPipeWrite);
*child_proc = pi.hProcess;
*child_exit_event = hExitEvent;
return 0;
}
/***********************************************************************
* master_main()
* master_main() runs in the parent process. It creates the child
* process which handles HTTP requests then waits on one of three
* events:
*
* restart_event
* -------------
* The restart event causes master_main to start a new child process and
* tells the old child process to exit (by setting the child_exit_event).
* The restart event is set as a result of one of the following:
* 1. An apache -k restart command on the command line
* 2. A command received from Windows service manager which gets
* translated into an ap_signal_parent(SIGNAL_PARENT_RESTART)
* call by code in service.c.
* 3. The child process calling ap_signal_parent(SIGNAL_PARENT_RESTART)
* as a result of hitting MaxRequestsPerChild.
*
* shutdown_event
* --------------
* The shutdown event causes master_main to tell the child process to
* exit and that the server is shutting down. The shutdown event is
* set as a result of one of the following:
* 1. An apache -k shutdown command on the command line
* 2. A command received from Windows service manager which gets
* translated into an ap_signal_parent(SIGNAL_PARENT_SHUTDOWN)
* call by code in service.c.
*
* child process handle
* --------------------
* The child process handle will be signaled if the child process
* exits for any reason. In a normal running server, the signaling
* of this event means that the child process has exited prematurely
* due to a seg fault or other irrecoverable error. For server
* robustness, master_main will restart the child process under this
* condtion.
*
* master_main uses the child_exit_event to signal the child process
* to exit.
**********************************************************************/
#define NUM_WAIT_HANDLES 3
#define CHILD_HANDLE 0
#define SHUTDOWN_HANDLE 1
#define RESTART_HANDLE 2
static int master_main(server_rec *s, HANDLE shutdown_event, HANDLE restart_event)
{
int rv, cld;
int restart_pending;
int shutdown_pending;
HANDLE child_exit_event;
HANDLE event_handles[NUM_WAIT_HANDLES];
restart_pending = shutdown_pending = 0;
event_handles[SHUTDOWN_HANDLE] = shutdown_event;
event_handles[RESTART_HANDLE] = restart_event;
/* Create a single child process */
rv = create_process(pconf, &event_handles[CHILD_HANDLE],
&child_exit_event);
if (rv < 0)
{
ap_log_error(APLOG_MARK, APLOG_CRIT, apr_get_os_error(), ap_server_conf,
"master_main: create child process failed. Exiting.");
shutdown_pending = 1;
goto die_now;
}
if (!strcasecmp(signal_arg, "runservice")) {
mpm_service_started();
}
/* Wait for shutdown or restart events or for child death */
rv = WaitForMultipleObjects(NUM_WAIT_HANDLES, (HANDLE *) event_handles, FALSE, INFINITE);
cld = rv - WAIT_OBJECT_0;
if (rv == WAIT_FAILED) {
/* Something serious is wrong */
ap_log_error(APLOG_MARK,APLOG_CRIT, apr_get_os_error(), ap_server_conf,
"master_main: WaitForMultipeObjects WAIT_FAILED -- doing server shutdown");
shutdown_pending = 1;
}
else if (rv == WAIT_TIMEOUT) {
/* Hey, this cannot happen */
ap_log_error(APLOG_MARK, APLOG_ERR, apr_get_os_error(), s,
"master_main: WaitForMultipeObjects with INFINITE wait exited with WAIT_TIMEOUT");
shutdown_pending = 1;
}
else if (cld == SHUTDOWN_HANDLE) {
/* shutdown_event signalled */
shutdown_pending = 1;
ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_INFO, APR_SUCCESS, s,
"Parent: Received shutdown signal -- Shutting down the server.");
if (ResetEvent(shutdown_event) == 0) {
ap_log_error(APLOG_MARK, APLOG_ERR, apr_get_os_error(), s,
"ResetEvent(shutdown_event)");
}
}
else if (cld == RESTART_HANDLE) {
/* Received a restart event. Prepare the restart_event to be reused
* then signal the child process to exit.
*/
restart_pending = 1;
ap_log_error(APLOG_MARK, APLOG_INFO, APR_SUCCESS, s,
"Parent: Received restart signal -- Restarting the server.");
if (ResetEvent(restart_event) == 0) {
ap_log_error(APLOG_MARK, APLOG_ERR, apr_get_os_error(), s,
"Parent: ResetEvent(restart_event) failed.");
}
if (SetEvent(child_exit_event) == 0) {
ap_log_error(APLOG_MARK, APLOG_ERR, apr_get_os_error(), s,
"Parent: SetEvent for child process %d failed.",
event_handles[CHILD_HANDLE]);
}
/* Don't wait to verify that the child process really exits,
* just move on with the restart.
*/
CloseHandle(event_handles[CHILD_HANDLE]);
event_handles[CHILD_HANDLE] = NULL;
++ap_my_generation;
}
else {
/* The child process exited prematurely due to a fatal error. */
DWORD exitcode;
if (!GetExitCodeProcess(event_handles[CHILD_HANDLE], &exitcode)) {
/* HUH? We did exit, didn't we? */
exitcode = APEXIT_CHILDFATAL;
}
if ( exitcode == APEXIT_CHILDFATAL
|| exitcode == APEXIT_CHILDINIT
|| exitcode == APEXIT_INIT) {
ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_INFO, APR_SUCCESS, ap_server_conf,
"Parent: child process exited with status %u -- Aborting.", exitcode);
}
else {
restart_pending = 1;
ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_INFO, APR_SUCCESS, ap_server_conf,
"Parent: child process exited with status %u -- Restarting.", exitcode);
}
CloseHandle(event_handles[CHILD_HANDLE]);
event_handles[CHILD_HANDLE] = NULL;
++ap_my_generation;
}
die_now:
if (shutdown_pending)
{
int timeout = 30000; /* Timeout is milliseconds */
/* This shutdown is only marginally graceful. We will give the
* child a bit of time to exit gracefully. If the time expires,
* the child will be wacked.
*/
if (strcasecmp(signal_arg, "runservice")) {
mpm_service_stopping();
}
/* Signal the child processes to exit */
if (SetEvent(child_exit_event) == 0) {
ap_log_error(APLOG_MARK,APLOG_ERR, apr_get_os_error(), ap_server_conf,
"Parent: SetEvent for child process %d failed", event_handles[CHILD_HANDLE]);
}
if (event_handles[CHILD_HANDLE]) {
rv = WaitForSingleObject(event_handles[CHILD_HANDLE], timeout);
if (rv == WAIT_OBJECT_0) {
ap_log_error(APLOG_MARK,APLOG_INFO|APLOG_NOERRNO, APR_SUCCESS, ap_server_conf,
"Parent: Child process %d exited successfully.", event_handles[CHILD_HANDLE]);
CloseHandle(event_handles[CHILD_HANDLE]);
event_handles[CHILD_HANDLE] = NULL;
}
else {
ap_log_error(APLOG_MARK,APLOG_INFO|APLOG_NOERRNO, APR_SUCCESS, ap_server_conf,
"Parent: Forcing termination of child process %d ", event_handles[CHILD_HANDLE]);
TerminateProcess(event_handles[CHILD_HANDLE], 1);
CloseHandle(event_handles[CHILD_HANDLE]);
event_handles[CHILD_HANDLE] = NULL;
}
}
return 0; /* Tell the caller we do not want to restart */
}
return 1; /* Tell the caller we want a restart */
}
/* service_nt_main_fn needs to append the StartService() args
* outside of our call stack and thread as the service starts...
*/
apr_array_header_t *mpm_new_argv;
/* Remember service_to_start failures to log and fail in pre_config.
* Remember inst_argc and inst_argv for installing or starting the
* service after we preflight the config.
*/
AP_DECLARE(apr_status_t) ap_mpm_query(int query_code, int *result)
{
switch(query_code){
case AP_MPMQ_MAX_DAEMON_USED:
*result = MAXIMUM_WAIT_OBJECTS;
return APR_SUCCESS;
case AP_MPMQ_IS_THREADED:
*result = AP_MPMQ_STATIC;
return APR_SUCCESS;
case AP_MPMQ_IS_FORKED:
*result = AP_MPMQ_NOT_SUPPORTED;
return APR_SUCCESS;
case AP_MPMQ_HARD_LIMIT_DAEMONS:
*result = HARD_SERVER_LIMIT;
return APR_SUCCESS;
case AP_MPMQ_HARD_LIMIT_THREADS:
*result = HARD_THREAD_LIMIT;
return APR_SUCCESS;
case AP_MPMQ_MAX_THREADS:
*result = ap_threads_per_child;
return APR_SUCCESS;
case AP_MPMQ_MIN_SPARE_DAEMONS:
*result = 0;
return APR_SUCCESS;
case AP_MPMQ_MIN_SPARE_THREADS:
*result = 0;
return APR_SUCCESS;
case AP_MPMQ_MAX_SPARE_DAEMONS:
*result = 0;
return APR_SUCCESS;
case AP_MPMQ_MAX_SPARE_THREADS:
*result = 0;
return APR_SUCCESS;
case AP_MPMQ_MAX_REQUESTS_DAEMON:
*result = ap_max_requests_per_child;
return APR_SUCCESS;
case AP_MPMQ_MAX_DAEMONS:
*result = 0;
return APR_SUCCESS;
}
return APR_ENOTIMPL;
}
#define SERVICE_UNSET (-1)
static apr_status_t service_set = SERVICE_UNSET;
static apr_status_t service_to_start_success;
static int inst_argc;
static const char * const *inst_argv;
static char *service_name = NULL;
void winnt_rewrite_args(process_rec *process)
{
/* Handle the following SCM aspects in this phase:
*
* -k runservice [transition for WinNT, nothing for Win9x]
* -k (!)install [error out if name is not installed]
* -k uninstall
* -k stop
* -k shutdown (same as -k stop). Maintained for backward compatability.
*
* We can't leave this phase until we know our identity
* and modify the command arguments appropriately.
*
* We do not care if the .conf file exists or is parsable when
* attempting to stop or uninstall a service.
*/
apr_status_t rv;
char *def_server_root;
char fnbuf[MAX_PATH];
char optbuf[3];
const char *optarg;
int fixed_args;
char *pid;
apr_getopt_t *opt;
int running_as_service = 1;
osver.dwOSVersionInfoSize = sizeof(OSVERSIONINFO);
GetVersionEx(&osver);
/* AP_PARENT_PID is only valid in the child */
pid = getenv("AP_PARENT_PID");
if (pid)
{
/* This is the child */
my_pid = GetCurrentProcessId();
parent_pid = (DWORD) atol(pid);
/* The parent is responsible for providing the
* COMPLETE ARGUMENTS REQUIRED to the child.
*
* No further argument parsing is needed, but
* for good measure we will provide a simple
* signal string for later testing.
*/
signal_arg = "runchild";
return;
}
/* This is the parent, we have a long way to go :-) */
parent_pid = my_pid = GetCurrentProcessId();
/* Rewrite process->argv[];
*
* strip out -k signal into signal_arg
* strip out -n servicename and set the names
* add default -d serverroot from the path of this executable
*
* The end result will look like:
*
* The invocation command (%0)
* The -d serverroot default from the running executable
* The requested service's (-n) registry ConfigArgs
* The WinNT SCM's StartService() args
*/
if (!GetModuleFileName(NULL, fnbuf, sizeof(fnbuf))) {
rv = apr_get_os_error();
ap_log_error(APLOG_MARK,APLOG_CRIT, rv, NULL,
"Failed to get the path of Apache.exe");
exit(APEXIT_INIT);
}
/* WARNING: There is an implict assumption here that the
* executable resides in ServerRoot or ServerRoot\bin
*/
def_server_root = (char *) apr_filename_of_pathname(fnbuf);
if (def_server_root > fnbuf) {
*(def_server_root - 1) = '\0';
def_server_root = (char *) apr_filename_of_pathname(fnbuf);
if (!strcasecmp(def_server_root, "bin"))
*(def_server_root - 1) = '\0';
}
apr_filepath_merge(&def_server_root, NULL, fnbuf,
APR_FILEPATH_TRUENAME, process->pool);
/* Use process->pool so that the rewritten argv
* lasts for the lifetime of the server process,
* because pconf will be destroyed after the
* initial pre-flight of the config parser.
*/
mpm_new_argv = apr_array_make(process->pool, process->argc + 2,
sizeof(const char *));
*(const char **)apr_array_push(mpm_new_argv) = process->argv[0];
*(const char **)apr_array_push(mpm_new_argv) = "-d";
*(const char **)apr_array_push(mpm_new_argv) = def_server_root;
fixed_args = mpm_new_argv->nelts;
optbuf[0] = '-';
optbuf[2] = '\0';
apr_getopt_init(&opt, process->pool, process->argc, (char**) process->argv);
opt->errfn = NULL;
while ((rv = apr_getopt(opt, "n:k:iu" AP_SERVER_BASEARGS,
optbuf + 1, &optarg)) == APR_SUCCESS) {
switch (optbuf[1]) {
case 'n':
service_set = mpm_service_set_name(process->pool, &service_name,
optarg);
break;
case 'k':
signal_arg = optarg;
break;
default:
*(const char **)apr_array_push(mpm_new_argv) =
apr_pstrdup(process->pool, optbuf);
if (optarg) {
*(const char **)apr_array_push(mpm_new_argv) = optarg;
}
break;
}
}
/* back up to capture the bad argument */
if (rv == APR_BADCH || rv == APR_BADARG) {
opt->ind--;
}
while (opt->ind < opt->argc) {
*(const char **)apr_array_push(mpm_new_argv) =
apr_pstrdup(process->pool, opt->argv[opt->ind++]);
}
/* Track the number of args actually entered by the user */
inst_argc = mpm_new_argv->nelts - fixed_args;
/* Provide a default 'run' -k arg to simplify signal_arg tests */
if (!signal_arg)
{
signal_arg = "run";
running_as_service = 0;
}
if (!strcasecmp(signal_arg, "runservice"))
{
/* Start the NT Service _NOW_ because the WinNT SCM is
* expecting us to rapidly assume control of our own
* process, the SCM will tell us our service name, and
* may have extra StartService() command arguments to
* add for us.
*
* Any other process has a console, so we don't to begin
* a Win9x service until the configuration is parsed and
* any command line errors are reported.
*
* We hold the return value so that we can die in pre_config
* after logging begins, and the failure can land in the log.
*/
if (osver.dwPlatformId == VER_PLATFORM_WIN32_NT) {
service_to_start_success = mpm_service_to_start(&service_name,
process->pool);
if (service_to_start_success == APR_SUCCESS) {
service_set = APR_SUCCESS;
}
}
}
/* Get the default for any -k option, except run */
if (service_set == SERVICE_UNSET && strcasecmp(signal_arg, "run")) {
service_set = mpm_service_set_name(process->pool, &service_name,
AP_DEFAULT_SERVICE_NAME);
}
if (!strcasecmp(signal_arg, "install")) /* -k install */
{
if (service_set == APR_SUCCESS)
{
ap_log_error(APLOG_MARK,APLOG_ERR, 0, NULL,
"%s: Service is already installed.", service_name);
exit(APEXIT_INIT);
}
}
else if (running_as_service)
{
if (service_set == APR_SUCCESS)
{
/* Attempt to Uninstall, or stop, before
* we can read the arguments or .conf files
*/
if (!strcasecmp(signal_arg, "uninstall")) {
rv = mpm_service_uninstall();
exit(rv);
}
if ((!strcasecmp(signal_arg, "stop")) ||
(!strcasecmp(signal_arg, "shutdown"))) {
mpm_signal_service(process->pool, 0);
exit(0);
}
rv = mpm_merge_service_args(process->pool, mpm_new_argv,
fixed_args);
if (rv == APR_SUCCESS) {
ap_log_error(APLOG_MARK,APLOG_NOERRNO|APLOG_INFO, 0, NULL,
"Using ConfigArgs of the installed service "
"\"%s\".", service_name);
}
else {
ap_log_error(APLOG_MARK,APLOG_WARNING, rv, NULL,
"No installed ConfigArgs for the service "
"\"%s\", using Apache defaults.", service_name);
}
}
else
{
ap_log_error(APLOG_MARK,APLOG_ERR, service_set, NULL,
"No installed service named \"%s\".", service_name);
exit(APEXIT_INIT);
}
}
if (strcasecmp(signal_arg, "install") && service_set && service_set != SERVICE_UNSET)
{
ap_log_error(APLOG_MARK,APLOG_ERR, service_set, NULL,
"No installed service named \"%s\".", service_name);
exit(APEXIT_INIT);
}
/* Track the args actually entered by the user.
* These will be used for the -k install parameters, as well as
* for the -k start service override arguments.
*/
inst_argv = (const char * const *)mpm_new_argv->elts
+ mpm_new_argv->nelts - inst_argc;
process->argc = mpm_new_argv->nelts;
process->argv = (const char * const *) mpm_new_argv->elts;
}
static int winnt_pre_config(apr_pool_t *pconf, apr_pool_t *plog, apr_pool_t *ptemp)
{
/* Handle the following SCM aspects in this phase:
*
* -k runservice [WinNT errors logged from rewrite_args]
*/
if (ap_exists_config_define("ONE_PROCESS") ||
ap_exists_config_define("DEBUG"))
one_process = -1;
if (!strcasecmp(signal_arg, "runservice")
&& (osver.dwPlatformId == VER_PLATFORM_WIN32_NT)
&& (service_to_start_success != APR_SUCCESS)) {
ap_log_error(APLOG_MARK,APLOG_CRIT, service_to_start_success, NULL,
"%s: Unable to start the service manager.",
service_name);
exit(APEXIT_INIT);
}
ap_listen_pre_config();
ap_threads_per_child = DEFAULT_START_THREAD;
ap_pid_fname = DEFAULT_PIDLOG;
ap_max_requests_per_child = DEFAULT_MAX_REQUESTS_PER_CHILD;
apr_cpystrn(ap_coredump_dir, ap_server_root, sizeof(ap_coredump_dir));
return OK;
}
static int winnt_post_config(apr_pool_t *pconf_, apr_pool_t *plog, apr_pool_t *ptemp, server_rec* s)
{
static int restart_num = 0;
apr_status_t rv = 0;
/* Initialize shared static objects.
*/
pconf = pconf_;
ap_server_conf = s;
/* Handle the following SCM aspects in this phase:
*
* -k install
* -k config
* -k start
* -k restart
* -k runservice [Win95, only once - after we parsed the config]
*
* because all of these signals are useful _only_ if there
* is a valid conf\httpd.conf environment to start.
*
* We reached this phase by avoiding errors that would cause
* these options to fail unexpectedly in another process.
*/
if (!strcasecmp(signal_arg, "install")) {
rv = mpm_service_install(ptemp, inst_argc, inst_argv, 0);
exit (rv);
}
if (!strcasecmp(signal_arg, "config")) {
rv = mpm_service_install(ptemp, inst_argc, inst_argv, 1);
exit (rv);
}
if (!strcasecmp(signal_arg, "start")) {
ap_listen_rec *lr;
/* Close the listening sockets. */
for (lr = ap_listeners; lr; lr = lr->next) {
apr_socket_close(lr->sd);
lr->active = 0;
}
rv = mpm_service_start(ptemp, inst_argc, inst_argv);
exit (rv);
}
if (!strcasecmp(signal_arg, "restart")) {
mpm_signal_service(ptemp, 1);
exit (rv);
}
if (parent_pid == my_pid)
{
if (restart_num++ == 1)
{
/* This code should be run once in the parent and not run
* across a restart
*/
PSECURITY_ATTRIBUTES sa = GetNullACL(); /* returns NULL if invalid (Win95?) */
setup_signal_names(apr_psprintf(pconf,"ap%d", parent_pid));
ap_log_pid(pconf, ap_pid_fname);
/* Create shutdown event, apPID_shutdown, where PID is the parent
* Apache process ID. Shutdown is signaled by 'apache -k shutdown'.
*/
shutdown_event = CreateEvent(sa, FALSE, FALSE, signal_shutdown_name);
if (!shutdown_event) {
ap_log_error(APLOG_MARK, APLOG_CRIT, apr_get_os_error(), ap_server_conf,
"Parent: Cannot create shutdown event %s", signal_shutdown_name);
CleanNullACL((void *)sa);
return HTTP_INTERNAL_SERVER_ERROR;
}
/* Create restart event, apPID_restart, where PID is the parent
* Apache process ID. Restart is signaled by 'apache -k restart'.
*/
restart_event = CreateEvent(sa, FALSE, FALSE, signal_restart_name);
if (!restart_event) {
CloseHandle(shutdown_event);
ap_log_error(APLOG_MARK, APLOG_CRIT, apr_get_os_error(), ap_server_conf,
"Parent: Cannot create restart event %s", signal_restart_name);
CleanNullACL((void *)sa);
return HTTP_INTERNAL_SERVER_ERROR;
}
CleanNullACL((void *)sa);
/* Now that we are flying at 15000 feet...
* wipe out the Win95 service console,
* signal the SCM the WinNT service started, or
* if not a service, setup console handlers instead.
*/
if (!strcasecmp(signal_arg, "runservice"))
{
if (osver.dwPlatformId != VER_PLATFORM_WIN32_NT)
{
rv = mpm_service_to_start(&service_name,
s->process->pool);
if (rv != APR_SUCCESS) {
ap_log_error(APLOG_MARK,APLOG_ERR, rv, ap_server_conf,
"%s: Unable to start the service manager.",
service_name);
return HTTP_INTERNAL_SERVER_ERROR;
}
}
}
else /* ! -k runservice */
{
mpm_start_console_handler();
}
/* Create the start mutex, apPID, where PID is the parent Apache process ID.
* Ths start mutex is used during a restart to prevent more than one
* child process from entering the accept loop at once.
*/
rv = apr_proc_mutex_create(&start_mutex,
signal_name_prefix,
APR_LOCK_DEFAULT,
ap_server_conf->process->pool);
if (rv != APR_SUCCESS) {
ap_log_error(APLOG_MARK,APLOG_ERR, rv, ap_server_conf,
"%s: Unable to create the start_mutex.",
service_name);
return HTTP_INTERNAL_SERVER_ERROR;
}
}
}
else /* parent_pid != my_pid */
{
mpm_start_child_console_handler();
}
return OK;
}
/* This really should be a post_config hook, but the error log is already
* redirected by that point, so we need to do this in the open_logs phase.
*/
static int winnt_open_logs(apr_pool_t *p, apr_pool_t *plog, apr_pool_t *ptemp, server_rec *s)
{
if (parent_pid != my_pid) {
return OK;
}
/* We cannot initialize our listeners if we are restarting
* (the parent process already has glomed on to them)
* nor should we do so for service reconfiguration
* (since the service may already be running.)
*/
if (!strcasecmp(signal_arg, "restart")
|| !strcasecmp(signal_arg, "config")) {
return OK;
}
if (ap_setup_listeners(s) < 1) {
ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_ALERT|APLOG_STARTUP, 0,
NULL, "no listening sockets available, shutting down");
return DONE;
}
if (!set_listeners_noninheritable(s->process->pool)) {
return 1;
}
return OK;
}
static void winnt_child_init(apr_pool_t *pchild, struct server_rec *s)
{
apr_status_t rv;
setup_signal_names(apr_psprintf(pchild,"ap%d", parent_pid));
/* This is a child process, not in single process mode */
if (!one_process) {
/* Set up events and the scoreboard */
get_handles_from_parent(s);
/* Set up the listeners */
get_listeners_from_parent(s);
ap_my_generation = atoi(getenv("AP_MY_GENERATION"));
rv = apr_proc_mutex_child_init(&start_mutex, signal_name_prefix,
s->process->pool);
}
else {
/* Single process mode - this lock doesn't even need to exist */
rv = apr_proc_mutex_create(&start_mutex, signal_name_prefix,
APR_LOCK_DEFAULT, s->process->pool);
/* Borrow the shutdown_even as our _child_ loop exit event */
exit_event = shutdown_event;
}
if (rv != APR_SUCCESS) {
ap_log_error(APLOG_MARK,APLOG_ERR, rv, ap_server_conf,
"%s child %d: Unable to init the start_mutex.",
service_name, my_pid);
exit(APEXIT_CHILDINIT);
}
}
AP_DECLARE(int) ap_mpm_run(apr_pool_t *_pconf, apr_pool_t *plog, server_rec *s )
{
static int restart = 0; /* Default is "not a restart" */
/* ### If non-graceful restarts are ever introduced - we need to rerun
* the pre_mpm hook on subsequent non-graceful restarts. But Win32
* has only graceful style restarts - and we need this hook to act
* the same on Win32 as on Unix.
*/
if (!restart && ((parent_pid == my_pid) || one_process)) {
/* Set up the scoreboard. */
if (ap_run_pre_mpm(s->process->pool, SB_SHARED) != OK) {
return 1;
}
}
if ((parent_pid != my_pid) || one_process)
{
/* The child process or in one_process (debug) mode
*/
ap_log_error(APLOG_MARK, APLOG_INFO, APR_SUCCESS, ap_server_conf,
"Child %d: Child process is running", my_pid);
child_main();
ap_log_error(APLOG_MARK, APLOG_INFO, APR_SUCCESS, ap_server_conf,
"Child %d: Child process is exiting", my_pid);
return 1;
}
else
{
/* A real-honest to goodness parent */
restart = master_main(ap_server_conf, shutdown_event, restart_event);
if (!restart)
{
/* Shutting down. Clean up... */
const char *pidfile = ap_server_root_relative (pconf, ap_pid_fname);
if (pidfile != NULL && unlink(pidfile) == 0) {
ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_INFO, APR_SUCCESS,
ap_server_conf, "removed PID file %s (pid=%ld)",
pidfile, GetCurrentProcessId());
}
apr_proc_mutex_destroy(start_mutex);
CloseHandle(restart_event);
CloseHandle(shutdown_event);
return 1;
}
}
return 0; /* Restart */
}
static void winnt_hooks(apr_pool_t *p)
{
/* The prefork open_logs phase must run before the core's, or stderr
* will be redirected to a file, and the messages won't print to the
* console.
*/
static const char *const aszSucc[] = {"core.c", NULL};
ap_hook_pre_config(winnt_pre_config, NULL, NULL, APR_HOOK_MIDDLE);
ap_hook_post_config(winnt_post_config, NULL, NULL, 0);
ap_hook_child_init(winnt_child_init, NULL, NULL, APR_HOOK_MIDDLE);
ap_hook_open_logs(winnt_open_logs, NULL, aszSucc, APR_HOOK_MIDDLE);
}
AP_MODULE_DECLARE_DATA module mpm_winnt_module = {
MPM20_MODULE_STUFF,
winnt_rewrite_args, /* hook to run before apache parses args */
NULL, /* create per-directory config structure */
NULL, /* merge per-directory config structures */
NULL, /* create per-server config structure */
NULL, /* merge per-server config structures */
winnt_cmds, /* command apr_table_t */
winnt_hooks /* register_hooks */
};
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