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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/>.
*/
#include "includes.h"
#include "system/filesys.h"
#include "system/locale.h"
/*******************************************************************
Close the low 3 fd's and open dev/null in their place.
********************************************************************/
_PUBLIC_ void close_low_fds(bool stdin_too, bool stdout_too, bool stderr_too)
{
#ifndef VALGRIND
int fd;
int i;
if (stdin_too)
close(0);
if (stdout_too)
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 == 0 && !stdin_too)
continue;
if (i == 1 && !stdout_too)
continue;
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));
close(fd);
return;
}
}
#endif
}
/****************************************************************************
Become a daemon, discarding the controlling terminal.
****************************************************************************/
_PUBLIC_ void become_daemon(bool do_fork, bool no_process_group, bool log_stdout)
{
if (do_fork) {
if (fork()) {
_exit(0);
}
}
/* detach from the terminal */
#ifdef HAVE_SETSID
if (!no_process_group) setsid();
#elif defined(TIOCNOTTY)
if (!no_process_group) {
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 as appropriate. Needed if started by rsh. */
/* stdin must be open if we do not fork, for monitoring for
* close. stdout must be open if we are logging there, and we
* never close stderr (but debug might dup it onto a log file) */
close_low_fds(do_fork, !log_stdout, false);
}
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