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/* this code is broken - there is a race condition with the unlink (tridge) */
/*
Unix SMB/CIFS implementation.
pidfile handling
Copyright (C) Andrew Tridgell 1998
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "includes.h"
#ifndef O_NONBLOCK
#define O_NONBLOCK
#endif
/* return the pid in a pidfile. return 0 if the process (or pidfile)
does not exist */
pid_t pidfile_pid(const char *name)
{
int fd;
char pidstr[20];
pid_t pid;
unsigned int ret;
char * pidFile;
if (asprintf(&pidFile, "%s/%s.pid", lp_piddir(), name) == -1) {
return 0;
}
fd = sys_open(pidFile, O_NONBLOCK | O_RDONLY, 0644);
if (fd == -1) {
SAFE_FREE(pidFile);
return 0;
}
ZERO_ARRAY(pidstr);
if (read(fd, pidstr, sizeof(pidstr)-1) <= 0) {
goto noproc;
}
ret = atoi(pidstr);
if (ret == 0) {
/* Obviously we had some garbage in the pidfile... */
DEBUG(1, ("Could not parse contents of pidfile %s\n",
pidFile));
goto noproc;
}
pid = (pid_t)ret;
if (!process_exists_by_pid(pid)) {
goto noproc;
}
if (fcntl_lock(fd,SMB_F_SETLK,0,1,F_RDLCK)) {
/* we could get the lock - it can't be a Samba process */
goto noproc;
}
SAFE_FREE(pidFile);
close(fd);
return (pid_t)ret;
noproc:
close(fd);
unlink(pidFile);
SAFE_FREE(pidFile);
return 0;
}
/* create a pid file in the pid directory. open it and leave it locked */
void pidfile_create(const char *program_name)
{
int fd;
char buf[20];
const char *short_configfile;
char *name;
char *pidFile;
pid_t pid;
/* Add a suffix to the program name if this is a process with a
* none default configuration file name. */
if (strcmp( CONFIGFILE, get_dyn_CONFIGFILE()) == 0) {
name = SMB_STRDUP(program_name);
} else {
short_configfile = strrchr( get_dyn_CONFIGFILE(), '/');
if (short_configfile == NULL) {
/* conf file in current directory */
short_configfile = get_dyn_CONFIGFILE();
} else {
/* full/relative path provided */
short_configfile++;
}
if (asprintf(&name, "%s-%s", program_name,
short_configfile) == -1) {
smb_panic("asprintf failed");
}
}
if (asprintf(&pidFile, "%s/%s.pid", lp_piddir(), name) == -1) {
smb_panic("asprintf failed");
}
pid = pidfile_pid(name);
if (pid != 0) {
DEBUG(0,("ERROR: %s is already running. File %s exists and process id %d is running.\n",
name, pidFile, (int)pid));
exit(1);
}
fd = sys_open(pidFile, O_NONBLOCK | O_CREAT | O_WRONLY | O_EXCL, 0644);
if (fd == -1) {
DEBUG(0,("ERROR: can't open %s: Error was %s\n", pidFile,
strerror(errno)));
exit(1);
}
if (fcntl_lock(fd,SMB_F_SETLK,0,1,F_WRLCK)==False) {
DEBUG(0,("ERROR: %s : fcntl lock of file %s failed. Error was %s\n",
name, pidFile, strerror(errno)));
exit(1);
}
memset(buf, 0, sizeof(buf));
slprintf(buf, sizeof(buf) - 1, "%u\n", (unsigned int) sys_getpid());
if (write(fd, buf, strlen(buf)) != (ssize_t)strlen(buf)) {
DEBUG(0,("ERROR: can't write to file %s: %s\n",
pidFile, strerror(errno)));
exit(1);
}
/* Leave pid file open & locked for the duration... */
SAFE_FREE(name);
SAFE_FREE(pidFile);
}
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