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