crypto/external/bsd/heimdal/dist/lib/roken/write_pid.c

   1 /*      $NetBSD: write_pid.c,v 1.1.1.1 2011/04/13 18:15:44 elric Exp $  */
   2
   3 /*
   4  * Copyright (c) 1999 - 2001 Kungliga Tekniska Högskolan
   5  * (Royal Institute of Technology, Stockholm, Sweden).
   6  * All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  *
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  *
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  *
  19  * 3. Neither the name of the Institute nor the names of its contributors
  20  *    may be used to endorse or promote products derived from this software
  21  *    without specific prior written permission.
  22  *
  23  * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
  24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
  27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  33  * SUCH DAMAGE.
  34  */
  35
  36 #include <config.h>
  37
  38 #include <krb5/roken.h>
  39
  40 ROKEN_LIB_FUNCTION char * ROKEN_LIB_CALL
  41 pid_file_write (const char *progname)
  42 {
  43     char *ret = NULL;
  44     FILE *fp;
  45
  46     if (asprintf (&ret, "%s%s.pid", _PATH_VARRUN, progname) < 0 || ret == NULL)
  47         return NULL;
  48     fp = fopen (ret, "w");
  49     if (fp == NULL) {
  50         free (ret);
  51         return NULL;
  52     }
  53     fprintf (fp, "%u", (unsigned)getpid());
  54     fclose (fp);
  55     return ret;
  56 }
  57
  58 ROKEN_LIB_FUNCTION void ROKEN_LIB_CALL
  59 pid_file_delete (char **filename)
  60 {
  61     if (*filename != NULL) {
  62         unlink (*filename);
  63         free (*filename);
  64         *filename = NULL;
  65     }
  66 }
  67
  68 #ifndef HAVE_PIDFILE
  69 static char *pidfile_path;
  70
  71 static void
  72 pidfile_cleanup(void)
  73 {
  74     if(pidfile_path != NULL)
  75         pid_file_delete(&pidfile_path);
  76 }
  77
  78 ROKEN_LIB_FUNCTION void ROKEN_LIB_CALL
  79 pidfile(const char *basename)
  80 {
  81     if(pidfile_path != NULL)
  82         return;
  83     if(basename == NULL)
  84         basename = getprogname();
  85     pidfile_path = pid_file_write(basename);
  86 #if defined(HAVE_ATEXIT)
  87     atexit(pidfile_cleanup);
  88 #elif defined(HAVE_ON_EXIT)
  89     on_exit(pidfile_cleanup);
  90 #endif
  91 }
  92 #endif