summaryrefslogtreecommitdiff
path: root/server/util/become_daemon.c
diff options
context:
space:
mode:
Diffstat (limited to 'server/util/become_daemon.c')
-rw-r--r--server/util/become_daemon.c98
1 files changed, 98 insertions, 0 deletions
diff --git a/server/util/become_daemon.c b/server/util/become_daemon.c
new file mode 100644
index 00000000..c753d08c
--- /dev/null
+++ b/server/util/become_daemon.c
@@ -0,0 +1,98 @@
+/*
+ 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 <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 */
+}
+