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"
29 static char *pidFile_name = NULL;
31 /* return the pid in a pidfile. return 0 if the process (or pidfile)
33 pid_t pidfile_pid(const char *name)
41 if (asprintf(&pidFile, "%s/%s.pid", lp_piddir(), name) == -1) {
45 fd = sys_open(pidFile, O_NONBLOCK | O_RDONLY, 0644);
53 if (read(fd, pidstr, sizeof(pidstr)-1) <= 0) {
60 /* Obviously we had some garbage in the pidfile... */
61 DEBUG(1, ("Could not parse contents of pidfile %s\n",
67 if (!process_exists_by_pid(pid)) {
71 if (fcntl_lock(fd,SMB_F_SETLK,0,1,F_RDLCK)) {
72 /* we could get the lock - it can't be a Samba process */
87 /* create a pid file in the pid directory. open it and leave it locked */
88 void pidfile_create(const char *program_name)
92 const char *short_configfile;
96 /* Add a suffix to the program name if this is a process with a
97 * none default configuration file name. */
98 if (strcmp( CONFIGFILE, get_dyn_CONFIGFILE()) == 0) {
99 name = SMB_STRDUP(program_name);
101 short_configfile = strrchr( get_dyn_CONFIGFILE(), '/');
102 if (short_configfile == NULL) {
103 /* conf file in current directory */
104 short_configfile = get_dyn_CONFIGFILE();
106 /* full/relative path provided */
109 if (asprintf(&name, "%s-%s", program_name,
110 short_configfile) == -1) {
111 smb_panic("asprintf failed");
115 if (asprintf(&pidFile_name, "%s/%s.pid", lp_piddir(), name) == -1) {
116 smb_panic("asprintf failed");
119 pid = pidfile_pid(name);
121 DEBUG(0,("ERROR: %s is already running. File %s exists and process id %d is running.\n",
122 name, pidFile_name, (int)pid));
126 fd = sys_open(pidFile_name, O_NONBLOCK | O_CREAT | O_WRONLY | O_EXCL,
129 DEBUG(0,("ERROR: can't open %s: Error was %s\n", pidFile_name,
134 if (fcntl_lock(fd,SMB_F_SETLK,0,1,F_WRLCK)==False) {
135 DEBUG(0,("ERROR: %s : fcntl lock of file %s failed. Error was %s\n",
136 name, pidFile_name, strerror(errno)));
140 memset(buf, 0, sizeof(buf));
141 slprintf(buf, sizeof(buf) - 1, "%u\n", (unsigned int) sys_getpid());
142 if (write(fd, buf, strlen(buf)) != (ssize_t)strlen(buf)) {
143 DEBUG(0,("ERROR: can't write to file %s: %s\n",
144 pidFile_name, strerror(errno)));
147 /* Leave pid file open & locked for the duration... */
150 /* set the close on exec so that we don't leak the fd */
151 fcntl(fd, F_SETFD, FD_CLOEXEC);
154 void pidfile_unlink(void)
156 if (pidFile_name == NULL) {
159 unlink(pidFile_name);
160 SAFE_FREE(pidFile_name);