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"
22 #include "lib/util/pidfile.h"
26 * @brief Pid file handling
30 * return the pid in a pidfile. return 0 if the process (or pidfile)
33 pid_t pidfile_pid(const char *piddir, const char *name)
35 size_t len = strlen(piddir) + strlen(name) + 6;
41 snprintf(pidFile, sizeof(pidFile), "%s/%s.pid", piddir, name);
43 fd = open(pidFile, O_NONBLOCK | O_RDONLY, 0644);
51 if (read(fd, pidstr, sizeof(pidstr)-1) <= 0) {
55 ret = (pid_t)atoi(pidstr);
57 DEBUG(1, ("Could not parse contents of pidfile %s\n",
62 if (!process_exists_by_pid(ret)) {
63 DEBUG(10, ("Process with PID=%d does not exist.\n", (int)ret));
67 if (fcntl_lock(fd,F_SETLK,0,1,F_RDLCK)) {
68 /* we could get the lock - it can't be a Samba process */
69 DEBUG(10, ("Process with PID=%d is not a Samba process.\n",
75 DEBUG(10, ("Process with PID=%d is running.\n", (int)ret));
84 * create a pid file in the pid directory. open it and leave it locked
86 void pidfile_create(const char *piddir, const char *name)
88 size_t len = strlen(piddir) + strlen(name) + 6;
94 snprintf(pidFile, sizeof(pidFile), "%s/%s.pid", piddir, name);
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, 0644);
105 DEBUG(0,("ERROR: can't open %s: Error was %s\n", pidFile,
110 smb_set_close_on_exec(fd);
112 if (fcntl_lock(fd,F_SETLK,0,1,F_WRLCK)==false) {
113 DEBUG(0,("ERROR: %s : fcntl lock of file %s failed. Error was %s\n",
114 name, pidFile, strerror(errno)));
118 memset(buf, 0, sizeof(buf));
119 slprintf(buf, sizeof(buf) - 1, "%u\n", (unsigned int) getpid());
120 if (write(fd, buf, strlen(buf)) != (ssize_t)strlen(buf)) {
121 DEBUG(0,("ERROR: can't write to file %s: %s\n",
122 pidFile, strerror(errno)));
126 /* Leave pid file open & locked for the duration... */
129 void pidfile_unlink(const char *piddir, const char *name)
132 char *pidFile = NULL;
134 if (asprintf(&pidFile, "%s/%s.pid", piddir, name) < 0) {
135 DEBUG(0,("ERROR: Out of memory\n"));
138 ret = unlink(pidFile);
140 DEBUG(0,("Failed to delete pidfile %s. Error was %s\n",
141 pidFile, strerror(errno)));