source3/lib/pidfile.c

   1 /* this code is broken - there is a race condition with the unlink (tridge) */
   2
   3 /*
   4    Unix SMB/CIFS implementation.
   5    pidfile handling
   6    Copyright (C) Andrew Tridgell 1998
   7    Copyright (C) Jeremy Allison 2012
   8
   9    This program is free software; you can redistribute it and/or modify
  10    it under the terms of the GNU General Public License as published by
  11    the Free Software Foundation; either version 3 of the License, or
  12    (at your option) any later version.
  13
  14    This program is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17    GNU General Public License for more details.
  18
  19    You should have received a copy of the GNU General Public License
  20    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  21 */
  22
  23 #include "includes.h"
  24 #include "system/filesys.h"
  25 #include "../lib/util/pidfile.h"
  26
  27 /* Malloc a pidfile name. */
  28 static char *get_pidfile_name(const char *program_name)
  29 {
  30         char *name = NULL;
  31
  32         /* Add a suffix to the program name if this is a process with a
  33          * none default configuration file name. */
  34         if (strcmp( CONFIGFILE, get_dyn_CONFIGFILE()) == 0) {
  35                 name = SMB_STRDUP(program_name);
  36         } else {
  37                 const char *short_configfile;
  38                 short_configfile = strrchr( get_dyn_CONFIGFILE(), '/');
  39                 if (short_configfile == NULL) {
  40                         /* conf file in current directory */
  41                         short_configfile = get_dyn_CONFIGFILE();
  42                 } else {
  43                         /* full/relative path provided */
  44                         short_configfile++;
  45                 }
  46                 if (asprintf(&name, "%s-%s", program_name,
  47                                 short_configfile) == -1) {
  48                         smb_panic("asprintf failed");
  49                 }
  50         }
  51         return name;
  52 }
  53
  54 /* return the pid in a pidfile. return 0 if the process (or pidfile)
  55    does not exist */
  56 pid_t pidfile_pid_s3(const char *program_name)
  57 {
  58         pid_t pid = 0;
  59         char *name = get_pidfile_name(program_name);
  60
  61         pid = pidfile_pid(lp_piddir(), name);
  62         SAFE_FREE(name);
  63         return pid;
  64 }
  65
  66 /* create a pid file in the pid directory. open it and leave it locked */
  67 void pidfile_create_s3(const char *program_name)
  68 {
  69         char *name = get_pidfile_name(program_name);
  70
  71         pidfile_create(lp_piddir(), name);
  72         SAFE_FREE(name);
  73 }
  74
  75 /* Remove a pidfile. */
  76 void pidfile_unlink_s3(const char *program_name)
  77 {
  78         char *name = get_pidfile_name(program_name);
  79         pidfile_unlink(lp_piddir(), name);
  80         SAFE_FREE(name);
  81 }