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/*
* 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 1.3 2003/01/09 22:53:13 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
extern char **environ;
/*------
* Alternative ways of updating ps display:
*
* PS_USE_PSTAT
* use the pstat(PSTAT_SETCMD, )
* (HPUX)
* PS_USE_PS_STRINGS
* assign PS_STRINGS->ps_argvstr = "string"
* (some BSD systems)
* PS_USE_CHANGE_ARGV
* assign argv[0] = "string"
* (some other BSD systems)
* PS_USE_CLOBBER_ARGV
* write over the argv and environment area
* (most SysV-like systems)
* PS_USE_NONE
* don't update ps display
* (This is the default, as it is safest.)
*/
#if defined(HAVE_PSTAT) && defined(PSTAT_SETCMD)
#define PS_USE_PSTAT
#elif defined(HAVE_PS_STRINGS)
#define PS_USE_PS_STRINGS
#elif defined(BSD) || defined(__bsdi__) || defined(__hurd__)
#define PS_USE_CHANGE_ARGV
#elif defined(__linux__) || defined(_AIX)
#define PS_USE_CLOBBER_ARGV
#else
#define PS_USE_NONE
#endif
/* Different systems want the buffer padded differently */
#if defined(_AIX) || defined(__linux__) || defined(__QNX__) || defined(__svr4__)
#define PS_PADDING '\0'
#else
#define PS_PADDING ' '
#endif
/*
* argv clobbering uses existing argv space, all other methods need a buffer
*/
#ifndef PS_USE_CLOBBER_ARGV
static char ps_buffer[256];
static const size_t ps_buffer_size = sizeof(ps_buffer);
#else /* PS_USE_CLOBBER_ARGV */
static char *ps_buffer; /* will point to argv area */
static size_t ps_buffer_size; /* space determined at run time */
#endif /* PS_USE_CLOBBER_ARGV */
/* save the original argv[] location here */
static int save_argc;
static char **save_argv;
extern char *__progname;
/*
* 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, ...)
{
#ifdef PS_USE_PSTAT
union pstun pst;
#endif
#ifndef 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;
#ifdef 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
*/
#ifdef PS_USE_CHANGE_ARGV
save_argv[0] = ps_buffer;
save_argv[1] = NULL;
#endif /* PS_USE_CHANGE_ARGV */
#ifdef 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 0
error("XXXXXXXXX %s", __progname);
error("XXXXXXXXX %d", ps_buffer_size);
error("XXXXXXXXX %s", ps_buffer);
#endif
#ifdef PS_USE_PSTAT
pst.pst_command = ps_buffer;
pstat(PSTAT_SETCMD, pst, strlen(ps_buffer), 0, 0);
#endif /* PS_USE_PSTAT */
#ifdef PS_USE_PS_STRINGS
PS_STRINGS->ps_nargvstr = 1;
PS_STRINGS->ps_argvstr = ps_buffer;
#endif /* PS_USE_PS_STRINGS */
#ifdef PS_USE_CLOBBER_ARGV
/* pad unused memory */
used = strlen(ps_buffer);
memset(ps_buffer + used, 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[])
{
#ifdef PS_USE_CLOBBER_ARGV
char *end_of_area = NULL;
char **new_environ;
int i;
#endif
save_argc = argc;
save_argv = argv;
#ifdef 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 */
}
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