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author | Simo Sorce <idra@samba.org> | 2008-10-03 13:01:57 -0400 |
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committer | Simo Sorce <idra@samba.org> | 2008-10-04 11:14:49 -0400 |
commit | 4458162a943a432b5f8517182e2ee7aab2590f85 (patch) | |
tree | 7b29a7ed33632565e216509f6f010be2dbbbb19c /server/util/become_daemon.c | |
parent | 9bd63b97c9c3132a0b3c8c6bd1c67f8c31a54c3c (diff) | |
download | sssd-4458162a943a432b5f8517182e2ee7aab2590f85.tar.gz sssd-4458162a943a432b5f8517182e2ee7aab2590f85.tar.bz2 sssd-4458162a943a432b5f8517182e2ee7aab2590f85.zip |
Initital server code.
Includes test monitor task.
Diffstat (limited to 'server/util/become_daemon.c')
-rw-r--r-- | server/util/become_daemon.c | 98 |
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 */ +} + |