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/>.
28 static char *pidFile_name = NULL;
30 /* return the pid in a pidfile. return 0 if the process (or pidfile)
32 pid_t pidfile_pid(const char *name)
40 if (asprintf(&pidFile, "%s/%s.pid", lp_piddir(), name) == -1) {
44 fd = sys_open(pidFile, O_NONBLOCK | O_RDONLY, 0644);
52 if (read(fd, pidstr, sizeof(pidstr)-1) <= 0) {
59 /* Obviously we had some garbage in the pidfile... */
60 DEBUG(1, ("Could not parse contents of pidfile %s\n",
66 if (!process_exists_by_pid(pid)) {
70 if (fcntl_lock(fd,SMB_F_SETLK,0,1,F_RDLCK)) {
71 /* we could get the lock - it can't be a Samba process */
86 /* create a pid file in the pid directory. open it and leave it locked */
87 void pidfile_create(const char *program_name)
91 const char *short_configfile;
95 /* Add a suffix to the program name if this is a process with a
96 * none default configuration file name. */
97 if (strcmp( CONFIGFILE, get_dyn_CONFIGFILE()) == 0) {
98 name = SMB_STRDUP(program_name);
100 short_configfile = strrchr( get_dyn_CONFIGFILE(), '/');
101 if (short_configfile == NULL) {
102 /* conf file in current directory */
103 short_configfile = get_dyn_CONFIGFILE();
105 /* full/relative path provided */
108 if (asprintf(&name, "%s-%s", program_name,
109 short_configfile) == -1) {
110 smb_panic("asprintf failed");
114 if (asprintf(&pidFile_name, "%s/%s.pid", lp_piddir(), name) == -1) {
115 smb_panic("asprintf failed");
118 pid = pidfile_pid(name);
120 DEBUG(0,("ERROR: %s is already running. File %s exists and process id %d is running.\n",
121 name, pidFile_name, (int)pid));
125 fd = sys_open(pidFile_name, O_NONBLOCK | O_CREAT | O_WRONLY | O_EXCL,
128 DEBUG(0,("ERROR: can't open %s: Error was %s\n", pidFile_name,
133 if (fcntl_lock(fd,SMB_F_SETLK,0,1,F_WRLCK)==False) {
134 DEBUG(0,("ERROR: %s : fcntl lock of file %s failed. Error was %s\n",
135 name, pidFile_name, strerror(errno)));
139 memset(buf, 0, sizeof(buf));
140 slprintf(buf, sizeof(buf) - 1, "%u\n", (unsigned int) sys_getpid());
141 if (write(fd, buf, strlen(buf)) != (ssize_t)strlen(buf)) {
142 DEBUG(0,("ERROR: can't write to file %s: %s\n",
143 pidFile_name, strerror(errno)));
146 /* Leave pid file open & locked for the duration... */
150 void pidfile_unlink(void)
152 if (pidFile_name == NULL) {
155 unlink(pidFile_name);
156 SAFE_FREE(pidFile_name);