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 2 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, write to the Free Software
20 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
29 /* return the pid in a pidfile. return 0 if the process (or pidfile)
31 pid_t pidfile_pid(const char *name)
39 slprintf(pidFile, sizeof(pidFile)-1, "%s/%s.pid", lp_piddir(), name);
41 fd = sys_open(pidFile, O_NONBLOCK | O_RDONLY, 0644);
48 if (read(fd, pidstr, sizeof(pidstr)-1) <= 0) {
55 /* Obviously we had some garbage in the pidfile... */
56 DEBUG(1, ("Could not parse contents of pidfile %s\n",
62 if (!process_exists_by_pid(pid)) {
66 if (fcntl_lock(fd,SMB_F_SETLK,0,1,F_RDLCK)) {
67 /* we could get the lock - it can't be a Samba process */
80 /* create a pid file in the pid directory. open it and leave it locked */
81 void pidfile_create(const char *program_name)
85 char *short_configfile;
90 /* Add a suffix to the program name if this is a process with a
91 * none default configuration file name. */
92 if (strcmp( CONFIGFILE, dyn_CONFIGFILE) == 0) {
93 strncpy( name, program_name, sizeof( name)-1);
95 short_configfile = strrchr( dyn_CONFIGFILE, '/');
96 if (short_configfile == NULL) {
97 /* conf file in current directory */
98 short_configfile = dyn_CONFIGFILE;
100 /* full/relative path provided */
103 slprintf( name, sizeof( name)-1, "%s-%s", program_name,
107 slprintf(pidFile, sizeof(pidFile)-1, "%s/%s.pid", lp_piddir(), name);
109 pid = pidfile_pid(name);
111 DEBUG(0,("ERROR: %s is already running. File %s exists and process id %d is running.\n",
112 name, pidFile, (int)pid));
116 fd = sys_open(pidFile, O_NONBLOCK | O_CREAT | O_WRONLY | O_EXCL, 0644);
118 DEBUG(0,("ERROR: can't open %s: Error was %s\n", pidFile,
123 if (fcntl_lock(fd,SMB_F_SETLK,0,1,F_WRLCK)==False) {
124 DEBUG(0,("ERROR: %s : fcntl lock of file %s failed. Error was %s\n",
125 name, pidFile, strerror(errno)));
129 memset(buf, 0, sizeof(buf));
130 slprintf(buf, sizeof(buf) - 1, "%u\n", (unsigned int) sys_getpid());
131 if (write(fd, buf, strlen(buf)) != (ssize_t)strlen(buf)) {
132 DEBUG(0,("ERROR: can't write to file %s: %s\n",
133 pidFile, strerror(errno)));
136 /* Leave pid file open & locked for the duration... */