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 3 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, see <http://www.gnu.org/licenses/>.
23 #include "system/filesys.h"
24 #include "smbd/pidfile.h"
28 * @brief Pid file handling
32 * return the pid in a pidfile. return 0 if the process (or pidfile)
35 pid_t pidfile_pid(const char *piddir, const char *name)
42 if (asprintf(&pidFile, "%s/%s.pid", piddir, name) < 0) {
46 fd = open(pidFile, O_NONBLOCK | O_RDONLY, 0644);
55 if (read(fd, pidstr, sizeof(pidstr)-1) <= 0) {
59 ret = (pid_t)atoi(pidstr);
61 if (!process_exists_by_pid(ret)) {
65 if (fcntl_lock(fd,F_SETLK,0,1,F_RDLCK)) {
66 /* we could get the lock - it can't be a Samba process */
82 * create a pid file in the pid directory. open it and leave it locked
84 void pidfile_create(const char *piddir, const char *name)
91 if (asprintf(&pidFile, "%s/%s.pid", piddir, name) < 0) {
92 DEBUG(0,("ERROR: Out of memory\n"));
96 pid = pidfile_pid(piddir, name);
98 DEBUG(0,("ERROR: %s is already running. File %s exists and process id %d is running.\n",
99 name, pidFile, (int)pid));
103 fd = open(pidFile, O_NONBLOCK | O_CREAT | O_WRONLY | O_EXCL, 0644);
105 DEBUG(0,("ERROR: can't open %s: Error was %s\n", pidFile,
110 if (fcntl_lock(fd,F_SETLK,0,1,F_WRLCK)==false) {
111 DEBUG(0,("ERROR: %s : fcntl lock of file %s failed. Error was %s\n",
112 name, pidFile, strerror(errno)));
116 memset(buf, 0, sizeof(buf));
117 slprintf(buf, sizeof(buf) - 1, "%u\n", (unsigned int) getpid());
118 if (write(fd, buf, strlen(buf)) != (ssize_t)strlen(buf)) {
119 DEBUG(0,("ERROR: can't write to file %s: %s\n",
120 pidFile, strerror(errno)));
124 /* Leave pid file open & locked for the duration... */