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https://github.com/samba-team/samba.git
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8d63c596a0
This fixes a bug in 116ce19b, where we didn't clear the pid cache in
become_daemon() and thus the /var/run/smbd.pid didn't match the actual
pid of the parent process.
Currently S4 will clear the pid cache on fork but doesn't yet take
advantage of the pid cache by using sys_pid() instead of the direct
get_pid().
94 lines
2.5 KiB
C
94 lines
2.5 KiB
C
/*
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Unix SMB/CIFS implementation.
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Samba utility functions
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Copyright (C) Andrew Tridgell 1992-1998
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Copyright (C) Jeremy Allison 2001-2002
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Copyright (C) Simo Sorce 2001
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Copyright (C) Jim McDonough (jmcd@us.ibm.com) 2003.
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Copyright (C) James J Myers 2003
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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 3 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, see <http://www.gnu.org/licenses/>.
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*/
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#include "includes.h"
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#include "system/filesys.h"
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#include "system/locale.h"
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/*******************************************************************
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Close the low 3 fd's and open dev/null in their place.
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********************************************************************/
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_PUBLIC_ void close_low_fds(bool stderr_too)
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{
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#ifndef VALGRIND
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int fd;
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int i;
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close(0);
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close(1);
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if (stderr_too)
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close(2);
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/* try and use up these file descriptors, so silly
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library routines writing to stdout etc won't cause havoc */
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for (i=0;i<3;i++) {
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if (i == 2 && !stderr_too)
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continue;
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fd = open("/dev/null",O_RDWR,0);
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if (fd < 0)
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fd = open("/dev/null",O_WRONLY,0);
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if (fd < 0) {
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DEBUG(0,("Can't open /dev/null\n"));
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return;
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}
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if (fd != i) {
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DEBUG(0,("Didn't get file descriptor %d\n",i));
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return;
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}
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}
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#endif
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}
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/****************************************************************************
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Become a daemon, discarding the controlling terminal.
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****************************************************************************/
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_PUBLIC_ void become_daemon(bool do_fork, bool no_process_group)
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{
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if (do_fork) {
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if (sys_fork()) {
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_exit(0);
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}
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}
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/* detach from the terminal */
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#ifdef HAVE_SETSID
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if (!no_process_group) setsid();
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#elif defined(TIOCNOTTY)
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if (!no_process_group) {
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int i = sys_open("/dev/tty", O_RDWR, 0);
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if (i != -1) {
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ioctl(i, (int) TIOCNOTTY, (char *)0);
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close(i);
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}
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}
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#endif /* HAVE_SETSID */
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/* Close fd's 0,1,2. Needed if started by rsh */
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close_low_fds(false); /* Don't close stderr, let the debug system
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attach it to the logfile */
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}
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