2 Unix SMB/CIFS implementation.
4 Copyright (C) Andrew Tridgell 1998
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 3 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program. If not, see <http://www.gnu.org/licenses/>.
21 #include "system/filesys.h"
23 #include "lib/util/blocking.h"
24 #include "lib/util/debug.h"
25 #include "lib/util/samba_util.h" /* For process_exists_by_pid() */
27 #include "lib/util/pidfile.h"
31 * @brief Pid file handling
35 * return the pid in a pidfile. return 0 if the process (or pidfile)
38 pid_t pidfile_pid(const char *piddir, const char *name)
40 size_t len = strlen(piddir) + strlen(name) + 6;
46 snprintf(pidFile, sizeof(pidFile), "%s/%s.pid", piddir, name);
48 fd = open(pidFile, O_NONBLOCK | O_RDONLY, 0644);
56 if (read(fd, pidstr, sizeof(pidstr)-1) <= 0) {
60 ret = (pid_t)atoi(pidstr);
62 DEBUG(1, ("Could not parse contents of pidfile %s\n",
67 if (!process_exists_by_pid(ret)) {
68 DEBUG(10, ("Process with PID=%d does not exist.\n", (int)ret));
72 if (fcntl_lock(fd,F_SETLK,0,1,F_RDLCK)) {
73 /* we could get the lock - it can't be a Samba process */
74 DEBUG(10, ("Process with PID=%d is not a Samba process.\n",
80 DEBUG(10, ("Process with PID=%d is running.\n", (int)ret));
89 * create a pid file in the pid directory. open it and leave it locked
91 void pidfile_create(const char *piddir, const char *name)
93 size_t len = strlen(piddir) + strlen(name) + 6;
99 snprintf(pidFile, sizeof(pidFile), "%s/%s.pid", piddir, name);
101 pid = pidfile_pid(piddir, name);
103 DEBUG(0,("ERROR: %s is already running. File %s exists and process id %d is running.\n",
104 name, pidFile, (int)pid));
108 fd = open(pidFile, O_NONBLOCK | O_CREAT | O_WRONLY, 0644);
110 DEBUG(0,("ERROR: can't open %s: Error was %s\n", pidFile,
115 smb_set_close_on_exec(fd);
117 if (fcntl_lock(fd,F_SETLK,0,1,F_WRLCK)==false) {
118 DEBUG(0,("ERROR: %s : fcntl lock of file %s failed. Error was %s\n",
119 name, pidFile, strerror(errno)));
123 memset(buf, 0, sizeof(buf));
124 slprintf(buf, sizeof(buf) - 1, "%u\n", (unsigned int) getpid());
125 if (write(fd, buf, strlen(buf)) != (ssize_t)strlen(buf)) {
126 DEBUG(0,("ERROR: can't write to file %s: %s\n",
127 pidFile, strerror(errno)));
131 /* Leave pid file open & locked for the duration... */
134 void pidfile_unlink(const char *piddir, const char *name)
137 char *pidFile = NULL;
139 if (asprintf(&pidFile, "%s/%s.pid", piddir, name) < 0) {
140 DEBUG(0,("ERROR: Out of memory\n"));
143 ret = unlink(pidFile);
145 DEBUG(0,("Failed to delete pidfile %s. Error was %s\n",
146 pidFile, strerror(errno)));