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/*
Unix SMB/Netbios implementation.
Version 1.9.
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 2 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, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "includes.h"
extern int DEBUGLEVEL;
#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(char *name)
{
FILE *f;
unsigned ret;
pstring pidFile;
slprintf(pidFile, sizeof(pidFile)-1, "%s/%s.pid", lp_lockdir(), name);
f = fopen(pidFile, "r");
if (!f) {
return 0;
}
if (fscanf(f,"%u", &ret) != 1) {
fclose(f);
return 0;
}
fclose(f);
if (!process_exists(ret)) return 0;
return (pid_t)ret;
}
/* create a pid file in the lock directory. open it and leave it locked */
void pidfile_create(char *name)
{
int fd;
char buf[20];
pstring pidFile;
int pid;
slprintf(pidFile, sizeof(pidFile)-1, "%s/%s.pid", lp_lockdir(), name);
pid = pidfile_pid(name);
if (pid > 0 && process_exists(pid)) {
DEBUG(0,("ERROR: %s is already running. File %s exists and process id %d is running.\n",
name, pidFile, pid));
exit(1);
}
fd = open(pidFile, O_NONBLOCK | O_CREAT | O_WRONLY, 0644);
if (fd < 0) {
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) getpid());
if (write(fd, buf, sizeof(buf)) != sizeof(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... */
}
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