1 /* this code is broken - there is a race condition with the unlink (tridge) */
4 Unix SMB/Netbios implementation.
7 Copyright (C) Andrew Tridgell 1998
9 This program is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 2 of the License, or
12 (at your option) any later version.
14 This program is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
19 You should have received a copy of the GNU General Public License
20 along with this program; if not, write to the Free Software
21 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
27 extern int DEBUGLEVEL;
33 /* return the pid in a pidfile. return 0 if the process (or pidfile)
35 pid_t pidfile_pid(char *name)
42 slprintf(pidFile, sizeof(pidFile)-1, "%s/%s.pid", lp_lockdir(), name);
44 fd = sys_open(pidFile, O_NONBLOCK | O_RDONLY, 0644);
51 if (read(fd, pidstr, sizeof(pidstr)-1) <= 0) {
57 if (!process_exists((pid_t)ret)) {
61 if (fcntl_lock(fd,SMB_F_SETLK,0,1,F_RDLCK)) {
62 /* we could get the lock - it can't be a Samba process */
75 /* create a pid file in the lock directory. open it and leave it locked */
76 void pidfile_create(char *name)
83 slprintf(pidFile, sizeof(pidFile)-1, "%s/%s.pid", lp_lockdir(), name);
85 pid = pidfile_pid(name);
87 DEBUG(0,("ERROR: %s is already running. File %s exists and process id %d is running.\n",
88 name, pidFile, (int)pid));
92 fd = sys_open(pidFile, O_NONBLOCK | O_CREAT | O_WRONLY | O_EXCL, 0644);
94 DEBUG(0,("ERROR: can't open %s: Error was %s\n", pidFile,
99 if (fcntl_lock(fd,SMB_F_SETLK,0,1,F_WRLCK)==False) {
100 DEBUG(0,("ERROR: %s : fcntl lock of file %s failed. Error was %s\n",
101 name, pidFile, strerror(errno)));
105 memset(buf, 0, sizeof(buf));
106 slprintf(buf, sizeof(buf) - 1, "%u\n", (unsigned int) sys_getpid());
107 if (write(fd, buf, sizeof(buf)) != sizeof(buf)) {
108 DEBUG(0,("ERROR: can't write to file %s: %s\n",
109 pidFile, strerror(errno)));
112 /* Leave pid file open & locked for the duration... */