lib/roken/write_pid.c

   1 /*
   2  * Copyright (c) 1999 - 2001 Kungliga Tekniska Högskolan
   3  * (Royal Institute of Technology, Stockholm, Sweden).
   4  * All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  *
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  *
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  *
  17  * 3. Neither the name of the Institute nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  */
  33
  34 #ifdef HAVE_CONFIG_H
  35 #include <config.h>
  36 RCSID("$Id$");
  37 #endif
  38
  39 #include <stdio.h>
  40 #include <sys/types.h>
  41 #include <unistd.h>
  42 #include "roken.h"
  43
  44 #include "roken.h"
  45
  46 char * ROKEN_LIB_FUNCTION
  47 pid_file_write (const char *progname)
  48 {
  49     FILE *fp;
  50     char *ret;
  51
  52     asprintf (&ret, "%s%s.pid", _PATH_VARRUN, progname);
  53     if (ret == NULL)
  54         return NULL;
  55     fp = fopen (ret, "w");
  56     if (fp == NULL) {
  57         free (ret);
  58         return NULL;
  59     }
  60     fprintf (fp, "%u", (unsigned)getpid());
  61     fclose (fp);
  62     return ret;
  63 }
  64
  65 void ROKEN_LIB_FUNCTION
  66 pid_file_delete (char **filename)
  67 {
  68     if (*filename != NULL) {
  69         unlink (*filename);
  70         free (*filename);
  71         *filename = NULL;
  72     }
  73 }
  74
  75 #ifndef HAVE_PIDFILE
  76 static char *pidfile_path;
  77
  78 static void
  79 pidfile_cleanup(void)
  80 {
  81     if(pidfile_path != NULL)
  82         pid_file_delete(&pidfile_path);
  83 }
  84
  85 void
  86 pidfile(const char *basename)
  87 {
  88     if(pidfile_path != NULL)
  89         return;
  90     if(basename == NULL)
  91         basename = getprogname();
  92     pidfile_path = pid_file_write(basename);
  93 #if defined(HAVE_ATEXIT)
  94     atexit(pidfile_cleanup);
  95 #elif defined(HAVE_ON_EXIT)
  96     on_exit(pidfile_cleanup);
  97 #endif
  98 }
  99 #endif