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/*
Unix SMB/CIFS implementation.
Samba utility functions
Copyright (C) Andrew Tridgell 1992-1998
Copyright (C) Jeremy Allison 2001-2002
Copyright (C) Simo Sorce 2001
Copyright (C) Jim McDonough (jmcd@us.ibm.com) 2003.
Copyright (C) James J Myers 2003
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/>.
*/
#define _GNU_SOURCE
#include <stdio.h>
#include <stdbool.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include "util/util.h"
/*******************************************************************
Close the low 3 fd's and open dev/null in their place.
********************************************************************/
static void close_low_fds(bool stderr_too)
{
#ifndef VALGRIND
int fd;
int i;
close(0);
close(1);
if (stderr_too)
close(2);
/* try and use up these file descriptors, so silly
library routines writing to stdout etc won't cause havoc */
for (i=0;i<3;i++) {
if (i == 2 && !stderr_too)
continue;
fd = open("/dev/null",O_RDWR,0);
if (fd < 0)
fd = open("/dev/null",O_WRONLY,0);
if (fd < 0) {
DEBUG(0,("Can't open /dev/null\n"));
return;
}
if (fd != i) {
DEBUG(0,("Didn't get file descriptor %d\n",i));
return;
}
}
#endif
}
/**
Become a daemon, discarding the controlling terminal.
**/
void become_daemon(bool Fork)
{
if (Fork) {
if (fork()) {
_exit(0);
}
}
/* detach from the terminal */
#ifdef HAVE_SETSID
setsid();
#elif defined(TIOCNOTTY)
{
int i = open("/dev/tty", O_RDWR, 0);
if (i != -1) {
ioctl(i, (int) TIOCNOTTY, (char *)0);
close(i);
}
}
#endif /* HAVE_SETSID */
/* Close fd's 0,1,2. Needed if started by rsh */
close_low_fds(false); /* Don't close stderr, let the debug system
attach it to the logfile */
}
int pidfile(const char *path, const char *name)
{
char pid_str[32];
pid_t pid;
char *file;
int fd;
int ret;
asprintf(&file, "%s/%s.pid", path, name);
fd = open(file, O_RDONLY, 0644);
if (fd != -1) {
pid_str[sizeof(pid_str) -1] = '\0';
ret = read(fd, pid_str, sizeof(pid_str) -1);
if (ret > 0) {
/* let's check the pid */
pid = (pid_t)atoi(pid_str);
if (pid != 0) {
errno = 0;
ret = kill(pid, 0);
if (ret != 0 && errno != ESRCH) {
close(fd);
free(file);
return EEXIST;
}
}
}
/* notihng in the file or no process */
close(fd);
unlink(file);
} else {
if (errno != ENOENT) {
free(file);
return EIO;
}
}
fd = open(file, O_CREAT | O_WRONLY | O_EXCL, 0644);
if (fd == -1) {
free(file);
return EIO;
}
free(file);
memset(pid_str, 0, sizeof(pid_str));
snprintf(pid_str, sizeof(pid_str) -1, "%u\n", (unsigned int) getpid());
ret = write(fd, pid_str, strlen(pid_str));
if (ret != strlen(pid_str)) {
close(fd);
return EIO;
}
close(fd);
return 0;
}
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