1 /* this code is broken - there is a race condition with the unlink (tridge) */
4 Unix SMB/CIFS implementation.
6 Copyright (C) Andrew Tridgell 1998
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2 of the License, or
11 (at your option) any later version.
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
24 #include "system/filesys.h"
30 /* return the pid in a pidfile. return 0 if the process (or pidfile)
32 pid_t pidfile_pid(const char *name)
39 asprintf(&pidFile, "%s/%s.pid", lp_piddir(), name);
41 fd = open(pidFile, O_NONBLOCK | O_RDONLY, 0644);
50 if (read(fd, pidstr, sizeof(pidstr)-1) <= 0) {
56 if (!process_exists((pid_t)ret)) {
60 if (fcntl_lock(fd,F_SETLK,0,1,F_RDLCK)) {
61 /* we could get the lock - it can't be a Samba process */
76 /* create a pid file in the pid directory. open it and leave it locked */
77 void pidfile_create(const char *name)
84 asprintf(&pidFile, "%s/%s.pid", lp_piddir(), name);
86 pid = pidfile_pid(name);
88 DEBUG(0,("ERROR: %s is already running. File %s exists and process id %d is running.\n",
89 name, pidFile, (int)pid));
93 fd = open(pidFile, O_NONBLOCK | O_CREAT | O_WRONLY | O_EXCL, 0644);
95 DEBUG(0,("ERROR: can't open %s: Error was %s\n", pidFile,
100 if (fcntl_lock(fd,F_SETLK,0,1,F_WRLCK)==False) {
101 DEBUG(0,("ERROR: %s : fcntl lock of file %s failed. Error was %s\n",
102 name, pidFile, strerror(errno)));
106 memset(buf, 0, sizeof(buf));
107 slprintf(buf, sizeof(buf) - 1, "%u\n", (uint_t) getpid());
108 if (write(fd, buf, strlen(buf)) != (ssize_t)strlen(buf)) {
109 DEBUG(0,("ERROR: can't write to file %s: %s\n",
110 pidFile, strerror(errno)));
114 /* Leave pid file open & locked for the duration... */