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https://github.com/samba-team/samba.git
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990d9d15db
else is around. We can't find the other guy anyway. Volker (This used to be commit bf8773b094d41941478f0164ce33838027fadc09)
117 lines
2.9 KiB
C
117 lines
2.9 KiB
C
/* this code is broken - there is a race condition with the unlink (tridge) */
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/*
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Unix SMB/CIFS implementation.
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pidfile handling
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Copyright (C) Andrew Tridgell 1998
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include "includes.h"
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#ifndef O_NONBLOCK
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#define O_NONBLOCK
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#endif
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/* return the pid in a pidfile. return 0 if the process (or pidfile)
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does not exist */
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pid_t pidfile_pid(const char *name)
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{
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int fd;
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char pidstr[20];
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unsigned ret;
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pstring pidFile;
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slprintf(pidFile, sizeof(pidFile)-1, "%s/%s.pid", lp_piddir(), name);
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fd = sys_open(pidFile, O_NONBLOCK | O_RDONLY, 0644);
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if (fd == -1) {
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return 0;
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}
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ZERO_ARRAY(pidstr);
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if (read(fd, pidstr, sizeof(pidstr)-1) <= 0) {
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goto noproc;
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}
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ret = atoi(pidstr);
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if (ret == 0) {
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/* Obviously we had some garbage in the pidfile... */
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DEBUG(1, ("Could not parse contents of pidfile %s\n",
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pidFile));
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goto noproc;
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}
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if (!process_exists((pid_t)ret)) {
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goto noproc;
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}
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if (fcntl_lock(fd,SMB_F_SETLK,0,1,F_RDLCK)) {
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/* we could get the lock - it can't be a Samba process */
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goto noproc;
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}
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close(fd);
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return (pid_t)ret;
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noproc:
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close(fd);
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unlink(pidFile);
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return 0;
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}
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/* create a pid file in the pid directory. open it and leave it locked */
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void pidfile_create(const char *name)
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{
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int fd;
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char buf[20];
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pstring pidFile;
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pid_t pid;
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slprintf(pidFile, sizeof(pidFile)-1, "%s/%s.pid", lp_piddir(), name);
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pid = pidfile_pid(name);
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if (pid != 0) {
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DEBUG(0,("ERROR: %s is already running. File %s exists and process id %d is running.\n",
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name, pidFile, (int)pid));
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exit(1);
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}
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fd = sys_open(pidFile, O_NONBLOCK | O_CREAT | O_WRONLY | O_EXCL, 0644);
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if (fd == -1) {
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DEBUG(0,("ERROR: can't open %s: Error was %s\n", pidFile,
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strerror(errno)));
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exit(1);
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}
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if (fcntl_lock(fd,SMB_F_SETLK,0,1,F_WRLCK)==False) {
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DEBUG(0,("ERROR: %s : fcntl lock of file %s failed. Error was %s\n",
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name, pidFile, strerror(errno)));
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exit(1);
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}
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memset(buf, 0, sizeof(buf));
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slprintf(buf, sizeof(buf) - 1, "%u\n", (unsigned int) sys_getpid());
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if (write(fd, buf, strlen(buf)) != (ssize_t)strlen(buf)) {
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DEBUG(0,("ERROR: can't write to file %s: %s\n",
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pidFile, strerror(errno)));
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exit(1);
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}
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/* Leave pid file open & locked for the duration... */
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}
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