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 /* return the pid in a pidfile. return 0 if the process (or pidfile)
30 pid_t pidfile_pid(const char *name)
38 if (asprintf(&pidFile, "%s/%s.pid", lp_piddir(), name) == -1) {
42 fd = sys_open(pidFile, O_NONBLOCK | O_RDONLY, 0644);
50 if (read(fd, pidstr, sizeof(pidstr)-1) <= 0) {
57 /* Obviously we had some garbage in the pidfile... */
58 DEBUG(1, ("Could not parse contents of pidfile %s\n",
64 if (!process_exists_by_pid(pid)) {
68 if (fcntl_lock(fd,SMB_F_SETLK,0,1,F_RDLCK)) {
69 /* we could get the lock - it can't be a Samba process */
84 /* create a pid file in the pid directory. open it and leave it locked */
85 void pidfile_create(const char *program_name)
89 char *short_configfile;
94 /* Add a suffix to the program name if this is a process with a
95 * none default configuration file name. */
96 if (strcmp( CONFIGFILE, dyn_CONFIGFILE) == 0) {
97 name = SMB_STRDUP(program_name);
99 short_configfile = strrchr( dyn_CONFIGFILE, '/');
100 if (short_configfile == NULL) {
101 /* conf file in current directory */
102 short_configfile = dyn_CONFIGFILE;
104 /* full/relative path provided */
107 if (asprintf(&name, "%s-%s", program_name,
108 short_configfile) == -1) {
109 smb_panic("asprintf failed");
113 if (asprintf(&pidFile, "%s/%s.pid", lp_piddir(), name) == -1) {
114 smb_panic("asprintf failed");
117 pid = pidfile_pid(name);
119 DEBUG(0,("ERROR: %s is already running. File %s exists and process id %d is running.\n",
120 name, pidFile, (int)pid));
124 fd = sys_open(pidFile, O_NONBLOCK | O_CREAT | O_WRONLY | O_EXCL, 0644);
126 DEBUG(0,("ERROR: can't open %s: Error was %s\n", pidFile,
131 if (fcntl_lock(fd,SMB_F_SETLK,0,1,F_WRLCK)==False) {
132 DEBUG(0,("ERROR: %s : fcntl lock of file %s failed. Error was %s\n",
133 name, pidFile, strerror(errno)));
137 memset(buf, 0, sizeof(buf));
138 slprintf(buf, sizeof(buf) - 1, "%u\n", (unsigned int) sys_getpid());
139 if (write(fd, buf, strlen(buf)) != (ssize_t)strlen(buf)) {
140 DEBUG(0,("ERROR: can't write to file %s: %s\n",
141 pidFile, strerror(errno)));
144 /* Leave pid file open & locked for the duration... */