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1d722cf18c
on platforms that need this. This is done by only writing past the previously stored message, if it was longer.
393 lines
9.9 KiB
C
393 lines
9.9 KiB
C
/*--------------------------------------------------------------------
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* ps_status.c
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*
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* Routines to support changing the ps display of PostgreSQL backends
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* to contain some useful information. Mechanism differs wildly across
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* platforms.
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*
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* $PostgreSQL: pgsql/src/backend/utils/misc/ps_status.c,v 1.35 2007/02/16 21:34:04 momjian Exp $
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*
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* Copyright (c) 2000-2007, PostgreSQL Global Development Group
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* various details abducted from various places
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*--------------------------------------------------------------------
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*/
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#include "postgres.h"
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#include <unistd.h>
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#ifdef HAVE_SYS_PSTAT_H
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#include <sys/pstat.h> /* for HP-UX */
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#endif
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#ifdef HAVE_PS_STRINGS
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#include <machine/vmparam.h> /* for old BSD */
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#include <sys/exec.h>
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#endif
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#if defined(__darwin__)
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#include <crt_externs.h>
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#endif
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#include "libpq/libpq.h"
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#include "miscadmin.h"
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#include "utils/ps_status.h"
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extern char **environ;
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bool update_process_title = true;
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/*
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* Alternative ways of updating ps display:
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*
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* PS_USE_SETPROCTITLE
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* use the function setproctitle(const char *, ...)
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* (newer BSD systems)
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* PS_USE_PSTAT
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* use the pstat(PSTAT_SETCMD, )
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* (HPUX)
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* PS_USE_PS_STRINGS
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* assign PS_STRINGS->ps_argvstr = "string"
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* (some BSD systems)
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* PS_USE_CHANGE_ARGV
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* assign argv[0] = "string"
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* (some other BSD systems)
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* PS_USE_CLOBBER_ARGV
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* write over the argv and environment area
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* (most SysV-like systems)
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* PS_USE_WIN32
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* push the string out as the name of a Windows event
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* PS_USE_NONE
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* don't update ps display
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* (This is the default, as it is safest.)
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*/
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#if defined(HAVE_SETPROCTITLE)
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#define PS_USE_SETPROCTITLE
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#elif defined(HAVE_PSTAT) && defined(PSTAT_SETCMD)
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#define PS_USE_PSTAT
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#elif defined(HAVE_PS_STRINGS)
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#define PS_USE_PS_STRINGS
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#elif (defined(BSD) || defined(__bsdi__) || defined(__hurd__)) && !defined(__darwin__)
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#define PS_USE_CHANGE_ARGV
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#elif defined(__linux__) || defined(_AIX) || defined(__sgi) || (defined(sun) && !defined(BSD)) || defined(ultrix) || defined(__ksr__) || defined(__osf__) || defined(__svr4__) || defined(__svr5__) || defined(__darwin__)
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#define PS_USE_CLOBBER_ARGV
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#elif defined(WIN32)
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#define PS_USE_WIN32
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#else
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#define PS_USE_NONE
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#endif
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/* Different systems want the buffer padded differently */
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#if defined(_AIX) || defined(__linux__) || defined(__svr4__)
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#define PS_PADDING '\0'
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#else
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#define PS_PADDING ' '
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#endif
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#ifndef PS_USE_CLOBBER_ARGV
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/* all but one options need a buffer to write their ps line in */
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#define PS_BUFFER_SIZE 256
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static char ps_buffer[PS_BUFFER_SIZE];
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static const size_t ps_buffer_size = PS_BUFFER_SIZE;
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#else /* PS_USE_CLOBBER_ARGV */
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static char *ps_buffer; /* will point to argv area */
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static size_t ps_buffer_size; /* space determined at run time */
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static size_t last_status_len; /* use to minimize length of clobber */
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#endif /* PS_USE_CLOBBER_ARGV */
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static size_t ps_buffer_fixed_size; /* size of the constant prefix */
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/* save the original argv[] location here */
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static int save_argc;
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static char **save_argv;
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/*
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* Call this early in startup to save the original argc/argv values.
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* If needed, we make a copy of the original argv[] array to preserve it
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* from being clobbered by subsequent ps_display actions.
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*
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* (The original argv[] will not be overwritten by this routine, but may be
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* overwritten during init_ps_display. Also, the physical location of the
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* environment strings may be moved, so this should be called before any code
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* that might try to hang onto a getenv() result.)
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*/
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char **
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save_ps_display_args(int argc, char **argv)
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{
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save_argc = argc;
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save_argv = argv;
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#if defined(PS_USE_CLOBBER_ARGV)
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/*
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* If we're going to overwrite the argv area, count the available space.
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* Also move the environment to make additional room.
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*/
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{
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char *end_of_area = NULL;
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char **new_environ;
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int i;
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/*
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* check for contiguous argv strings
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*/
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for (i = 0; i < argc; i++)
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{
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if (i == 0 || end_of_area + 1 == argv[i])
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end_of_area = argv[i] + strlen(argv[i]);
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}
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if (end_of_area == NULL) /* probably can't happen? */
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{
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ps_buffer = NULL;
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ps_buffer_size = 0;
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return argv;
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}
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/*
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* check for contiguous environ strings following argv
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*/
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for (i = 0; environ[i] != NULL; i++)
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{
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if (end_of_area + 1 == environ[i])
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end_of_area = environ[i] + strlen(environ[i]);
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}
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ps_buffer = argv[0];
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last_status_len = ps_buffer_size = end_of_area - argv[0];
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/*
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* move the environment out of the way
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*/
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new_environ = (char **) malloc((i + 1) * sizeof(char *));
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for (i = 0; environ[i] != NULL; i++)
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new_environ[i] = strdup(environ[i]);
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new_environ[i] = NULL;
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environ = new_environ;
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}
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#endif /* PS_USE_CLOBBER_ARGV */
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#if defined(PS_USE_CHANGE_ARGV) || defined(PS_USE_CLOBBER_ARGV)
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/*
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* If we're going to change the original argv[] then make a copy for
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* argument parsing purposes.
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*
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* (NB: do NOT think to remove the copying of argv[], even though
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* postmaster.c finishes looking at argv[] long before we ever consider
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* changing the ps display. On some platforms, getopt() keeps pointers
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* into the argv array, and will get horribly confused when it is
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* re-called to analyze a subprocess' argument string if the argv storage
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* has been clobbered meanwhile. Other platforms have other dependencies
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* on argv[].
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*/
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{
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char **new_argv;
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int i;
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new_argv = (char **) malloc((argc + 1) * sizeof(char *));
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for (i = 0; i < argc; i++)
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new_argv[i] = strdup(argv[i]);
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new_argv[argc] = NULL;
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#if defined(__darwin__)
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/*
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* Darwin (and perhaps other NeXT-derived platforms?) has a static
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* copy of the argv pointer, which we may fix like so:
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*/
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*_NSGetArgv() = new_argv;
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#endif
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argv = new_argv;
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}
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#endif /* PS_USE_CHANGE_ARGV or PS_USE_CLOBBER_ARGV */
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return argv;
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}
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/*
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* Call this once during subprocess startup to set the identification
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* values. At this point, the original argv[] array may be overwritten.
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*/
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void
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init_ps_display(const char *username, const char *dbname,
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const char *host_info, const char *initial_str)
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{
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Assert(username);
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Assert(dbname);
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Assert(host_info);
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#ifndef PS_USE_NONE
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/* no ps display for stand-alone backend */
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if (!IsUnderPostmaster)
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return;
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/* no ps display if you didn't call save_ps_display_args() */
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if (!save_argv)
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return;
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#ifdef PS_USE_CLOBBER_ARGV
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/* If ps_buffer is a pointer, it might still be null */
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if (!ps_buffer)
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return;
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#endif
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/*
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* Overwrite argv[] to point at appropriate space, if needed
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*/
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#ifdef PS_USE_CHANGE_ARGV
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save_argv[0] = ps_buffer;
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save_argv[1] = NULL;
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#endif /* PS_USE_CHANGE_ARGV */
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#ifdef PS_USE_CLOBBER_ARGV
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{
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int i;
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/* make extra argv slots point at end_of_area (a NUL) */
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for (i = 1; i < save_argc; i++)
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save_argv[i] = ps_buffer + ps_buffer_size;
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}
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#endif /* PS_USE_CLOBBER_ARGV */
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/*
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* Make fixed prefix of ps display.
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*/
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#ifdef PS_USE_SETPROCTITLE
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/*
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* apparently setproctitle() already adds a `progname:' prefix to the ps
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* line
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*/
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snprintf(ps_buffer, ps_buffer_size,
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"%s %s %s ",
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username, dbname, host_info);
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#else
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snprintf(ps_buffer, ps_buffer_size,
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"postgres: %s %s %s ",
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username, dbname, host_info);
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#endif
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ps_buffer_fixed_size = strlen(ps_buffer);
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set_ps_display(initial_str, true);
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#endif /* not PS_USE_NONE */
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}
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/*
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* Call this to update the ps status display to a fixed prefix plus an
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* indication of what you're currently doing passed in the argument.
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*/
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void
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set_ps_display(const char *activity, bool force)
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{
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if (!force && !update_process_title)
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return;
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#ifndef PS_USE_NONE
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/* no ps display for stand-alone backend */
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if (!IsUnderPostmaster)
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return;
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#ifdef PS_USE_CLOBBER_ARGV
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/* If ps_buffer is a pointer, it might still be null */
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if (!ps_buffer)
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return;
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#endif
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/* Update ps_buffer to contain both fixed part and activity */
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strlcpy(ps_buffer + ps_buffer_fixed_size, activity,
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ps_buffer_size - ps_buffer_fixed_size);
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/* Transmit new setting to kernel, if necessary */
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#ifdef PS_USE_SETPROCTITLE
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setproctitle("%s", ps_buffer);
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#endif
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#ifdef PS_USE_PSTAT
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{
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union pstun pst;
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pst.pst_command = ps_buffer;
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pstat(PSTAT_SETCMD, pst, strlen(ps_buffer), 0, 0);
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}
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#endif /* PS_USE_PSTAT */
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#ifdef PS_USE_PS_STRINGS
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PS_STRINGS->ps_nargvstr = 1;
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PS_STRINGS->ps_argvstr = ps_buffer;
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#endif /* PS_USE_PS_STRINGS */
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#ifdef PS_USE_CLOBBER_ARGV
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{
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int buflen;
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/* pad unused memory */
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buflen = strlen(ps_buffer);
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/* clobber remainder of old status string */
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if (last_status_len > buflen)
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MemSet(ps_buffer + buflen, PS_PADDING, last_status_len - buflen);
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last_status_len = buflen;
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}
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#endif /* PS_USE_CLOBBER_ARGV */
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#ifdef PS_USE_WIN32
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{
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/*
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* Win32 does not support showing any changed arguments. To make it at
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* all possible to track which backend is doing what, we create a
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* named object that can be viewed with for example Process Explorer.
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*/
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static HANDLE ident_handle = INVALID_HANDLE_VALUE;
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char name[PS_BUFFER_SIZE + 32];
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if (ident_handle != INVALID_HANDLE_VALUE)
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CloseHandle(ident_handle);
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sprintf(name, "pgident: %s", ps_buffer);
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ident_handle = CreateEvent(NULL, TRUE, FALSE, name);
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}
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#endif /* PS_USE_WIN32 */
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#endif /* not PS_USE_NONE */
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}
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/*
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* Returns what's currently in the ps display, in case someone needs
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* it. Note that only the activity part is returned. On some platforms
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* the string will not be null-terminated, so return the effective
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* length into *displen.
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*/
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const char *
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get_ps_display(int *displen)
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{
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#ifdef PS_USE_CLOBBER_ARGV
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size_t offset;
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/* If ps_buffer is a pointer, it might still be null */
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if (!ps_buffer)
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{
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*displen = 0;
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return "";
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}
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/* Remove any trailing spaces to offset the effect of PS_PADDING */
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offset = ps_buffer_size;
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while (offset > ps_buffer_fixed_size && ps_buffer[offset - 1] == PS_PADDING)
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offset--;
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*displen = offset - ps_buffer_fixed_size;
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#else
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*displen = strlen(ps_buffer + ps_buffer_fixed_size);
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#endif
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return ps_buffer + ps_buffer_fixed_size;
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}
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