244 lines
6.8 KiB
C
244 lines
6.8 KiB
C
/*
|
|
* Based on src/backend/utils/misc/pg_status.c from
|
|
* PostgreSQL Database Management System
|
|
*
|
|
* Portions Copyright (c) 1996-2001, The PostgreSQL Global Development Group
|
|
*
|
|
* Portions Copyright (c) 1994, The Regents of the University of California
|
|
*
|
|
* Permission to use, copy, modify, and distribute this software and its
|
|
* documentation for any purpose, without fee, and without a written agreement
|
|
* is hereby granted, provided that the above copyright notice and this
|
|
* paragraph and the following two paragraphs appear in all copies.
|
|
*
|
|
* IN NO EVENT SHALL THE UNIVERSITY OF CALIFORNIA BE LIABLE TO ANY PARTY FOR
|
|
* DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES, INCLUDING
|
|
* LOST PROFITS, ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS
|
|
* DOCUMENTATION, EVEN IF THE UNIVERSITY OF CALIFORNIA HAS BEEN ADVISED OF THE
|
|
* POSSIBILITY OF SUCH DAMAGE.
|
|
*
|
|
* THE UNIVERSITY OF CALIFORNIA SPECIFICALLY DISCLAIMS ANY WARRANTIES,
|
|
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
|
|
* AND FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
|
|
* ON AN "AS IS" BASIS, AND THE UNIVERSITY OF CALIFORNIA HAS NO OBLIGATIONS TO
|
|
* PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
|
|
*/
|
|
|
|
/*--------------------------------------------------------------------
|
|
* ps_status.c
|
|
*
|
|
* Routines to support changing the ps display of PostgreSQL backends
|
|
* to contain some useful information. Mechanism differs wildly across
|
|
* platforms.
|
|
*
|
|
* $Header: /var/cvs/openssh/openbsd-compat/setproctitle.c,v 1.5 2003/01/20 02:15:11 djm Exp $
|
|
*
|
|
* Copyright 2000 by PostgreSQL Global Development Group
|
|
* various details abducted from various places
|
|
*--------------------------------------------------------------------
|
|
*/
|
|
|
|
#include "includes.h"
|
|
|
|
#ifndef HAVE_SETPROCTITLE
|
|
|
|
#include <unistd.h>
|
|
#ifdef HAVE_SYS_PSTAT_H
|
|
#include <sys/pstat.h> /* for HP-UX */
|
|
#endif
|
|
#ifdef HAVE_PS_STRINGS
|
|
#include <machine/vmparam.h> /* for old BSD */
|
|
#include <sys/exec.h>
|
|
#endif
|
|
|
|
/*------
|
|
* Alternative ways of updating ps display:
|
|
*
|
|
* SETPROCTITLE_STRATEGY == PS_USE_PSTAT
|
|
* use the pstat(PSTAT_SETCMD, )
|
|
* (HPUX)
|
|
* SETPROCTITLE_STRATEGY == PS_USE_PS_STRINGS
|
|
* assign PS_STRINGS->ps_argvstr = "string"
|
|
* (some BSD systems)
|
|
* SETPROCTITLE_STRATEGY == PS_USE_CHANGE_ARGV
|
|
* assign argv[0] = "string"
|
|
* (some other BSD systems)
|
|
* SETPROCTITLE_STRATEGY == PS_USE_CLOBBER_ARGV
|
|
* write over the argv and environment area
|
|
* (most SysV-like systems)
|
|
* SETPROCTITLE_STRATEGY == PS_USE_NONE
|
|
* don't update ps display
|
|
* (This is the default, as it is safest.)
|
|
*/
|
|
|
|
#define PS_USE_NONE 0
|
|
#define PS_USE_PSTAT 1
|
|
#define PS_USE_PS_STRINGS 2
|
|
#define PS_USE_CHANGE_ARGV 3
|
|
#define PS_USE_CLOBBER_ARGV 4
|
|
|
|
#ifndef SETPROCTITLE_STRATEGY
|
|
# define SETPROCTITLE_STRATEGY PS_USE_NONE
|
|
#endif
|
|
|
|
#ifndef SETPROCTITLE_PS_PADDING
|
|
# define SETPROCTITLE_PS_PADDING ' '
|
|
#endif
|
|
#endif /* HAVE_SETPROCTITLE */
|
|
|
|
extern char **environ;
|
|
|
|
/*
|
|
* argv clobbering uses existing argv space, all other methods need a buffer
|
|
*/
|
|
#if SETPROCTITLE_STRATEGY != PS_USE_CLOBBER_ARGV
|
|
static char ps_buffer[256];
|
|
static const size_t ps_buffer_size = sizeof(ps_buffer);
|
|
#else
|
|
static char *ps_buffer; /* will point to argv area */
|
|
static size_t ps_buffer_size; /* space determined at run time */
|
|
#endif
|
|
|
|
/* save the original argv[] location here */
|
|
static int save_argc;
|
|
static char **save_argv;
|
|
|
|
extern char *__progname;
|
|
|
|
#ifndef HAVE_SETPROCTITLE
|
|
/*
|
|
* Call this to update the ps status display to a fixed prefix plus an
|
|
* indication of what you're currently doing passed in the argument.
|
|
*/
|
|
void
|
|
setproctitle(const char *fmt, ...)
|
|
{
|
|
#if SETPROCTITLE_STRATEGY == PS_USE_PSTAT
|
|
union pstun pst;
|
|
#endif
|
|
#if SETPROCTITLE_STRATEGY != PS_USE_NONE
|
|
ssize_t used;
|
|
va_list ap;
|
|
|
|
/* no ps display if you didn't call save_ps_display_args() */
|
|
if (save_argv == NULL)
|
|
return;
|
|
#if SETPROCTITLE_STRATEGY == PS_USE_CLOBBER_ARGV
|
|
/* If ps_buffer is a pointer, it might still be null */
|
|
if (ps_buffer == NULL)
|
|
return;
|
|
#endif /* PS_USE_CLOBBER_ARGV */
|
|
|
|
/*
|
|
* Overwrite argv[] to point at appropriate space, if needed
|
|
*/
|
|
#if SETPROCTITLE_STRATEGY == PS_USE_CHANGE_ARGV
|
|
save_argv[0] = ps_buffer;
|
|
save_argv[1] = NULL;
|
|
#endif /* PS_USE_CHANGE_ARGV */
|
|
|
|
#if SETPROCTITLE_STRATEGY == PS_USE_CLOBBER_ARGV
|
|
save_argv[1] = NULL;
|
|
#endif /* PS_USE_CLOBBER_ARGV */
|
|
|
|
/*
|
|
* Make fixed prefix of ps display.
|
|
*/
|
|
|
|
va_start(ap, fmt);
|
|
if (fmt == NULL)
|
|
snprintf(ps_buffer, ps_buffer_size, "%s", __progname);
|
|
else {
|
|
used = snprintf(ps_buffer, ps_buffer_size, "%s: ", __progname);
|
|
if (used == -1 || used >= ps_buffer_size)
|
|
used = ps_buffer_size;
|
|
vsnprintf(ps_buffer + used, ps_buffer_size - used, fmt, ap);
|
|
}
|
|
va_end(ap);
|
|
|
|
#if SETPROCTITLE_STRATEGY == PS_USE_PSTAT
|
|
pst.pst_command = ps_buffer;
|
|
pstat(PSTAT_SETCMD, pst, strlen(ps_buffer), 0, 0);
|
|
#endif /* PS_USE_PSTAT */
|
|
|
|
#if SETPROCTITLE_STRATEGY == PS_USE_PS_STRINGS
|
|
PS_STRINGS->ps_nargvstr = 1;
|
|
PS_STRINGS->ps_argvstr = ps_buffer;
|
|
#endif /* PS_USE_PS_STRINGS */
|
|
|
|
#if SETPROCTITLE_STRATEGY == PS_USE_CLOBBER_ARGV
|
|
/* pad unused memory */
|
|
used = strlen(ps_buffer);
|
|
memset(ps_buffer + used, SETPROCTITLE_PS_PADDING,
|
|
ps_buffer_size - used);
|
|
#endif /* PS_USE_CLOBBER_ARGV */
|
|
|
|
#endif /* PS_USE_NONE */
|
|
}
|
|
|
|
#endif /* HAVE_SETPROCTITLE */
|
|
|
|
/*
|
|
* Call this early in startup to save the original argc/argv values.
|
|
*
|
|
* argv[] will not be overwritten by this routine, but may be overwritten
|
|
* during setproctitle. Also, the physical location of the environment
|
|
* strings may be moved, so this should be called before any code that
|
|
* might try to hang onto a getenv() result.
|
|
*/
|
|
void
|
|
compat_init_setproctitle(int argc, char *argv[])
|
|
{
|
|
#if SETPROCTITLE_STRATEGY == PS_USE_CLOBBER_ARGV
|
|
char *end_of_area = NULL;
|
|
char **new_environ;
|
|
int i;
|
|
#endif
|
|
|
|
save_argc = argc;
|
|
save_argv = argv;
|
|
|
|
#if SETPROCTITLE_STRATEGY == PS_USE_CLOBBER_ARGV
|
|
/*
|
|
* If we're going to overwrite the argv area, count the available
|
|
* space. Also move the environment to make additional room.
|
|
*/
|
|
|
|
/*
|
|
* check for contiguous argv strings
|
|
*/
|
|
for (i = 0; i < argc; i++) {
|
|
if (i == 0 || end_of_area + 1 == argv[i])
|
|
end_of_area = argv[i] + strlen(argv[i]);
|
|
}
|
|
|
|
/* probably can't happen? */
|
|
if (end_of_area == NULL) {
|
|
ps_buffer = NULL;
|
|
ps_buffer_size = 0;
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* check for contiguous environ strings following argv
|
|
*/
|
|
for (i = 0; environ[i] != NULL; i++) {
|
|
if (end_of_area + 1 == environ[i])
|
|
end_of_area = environ[i] + strlen(environ[i]);
|
|
}
|
|
|
|
ps_buffer = argv[0];
|
|
ps_buffer_size = end_of_area - argv[0] - 1;
|
|
|
|
/*
|
|
* Duplicate and move the environment out of the way
|
|
*/
|
|
new_environ = malloc(sizeof(char *) * (i + 1));
|
|
for (i = 0; environ[i] != NULL; i++)
|
|
new_environ[i] = strdup(environ[i]);
|
|
new_environ[i] = NULL;
|
|
environ = new_environ;
|
|
#endif /* PS_USE_CLOBBER_ARGV */
|
|
}
|
|
|