| 1 | /*
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| 2 | Unix SMB/CIFS implementation.
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| 3 | Samba utility functions
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| 4 | Copyright (C) Andrew Tridgell 1992-1998
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| 5 | Copyright (C) Jeremy Allison 2001-2002
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| 6 | Copyright (C) Simo Sorce 2001
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| 7 | Copyright (C) Jim McDonough (jmcd@us.ibm.com) 2003.
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| 8 | Copyright (C) James J Myers 2003
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| 9 |
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| 10 | This program is free software; you can redistribute it and/or modify
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| 11 | it under the terms of the GNU General Public License as published by
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| 12 | the Free Software Foundation; either version 3 of the License, or
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| 13 | (at your option) any later version.
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| 14 |
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| 15 | This program is distributed in the hope that it will be useful,
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| 16 | but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 17 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 18 | GNU General Public License for more details.
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| 19 |
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| 20 | You should have received a copy of the GNU General Public License
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| 21 | along with this program. If not, see <http://www.gnu.org/licenses/>.
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| 22 | */
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| 23 |
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| 24 | #include "includes.h"
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| 25 | #include "system/filesys.h"
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| 26 | #include "system/locale.h"
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| 27 |
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| 28 | /*******************************************************************
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| 29 | Close the low 3 fd's and open dev/null in their place.
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| 30 | ********************************************************************/
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| 31 |
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| 32 | _PUBLIC_ void close_low_fds(bool stderr_too)
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| 33 | {
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| 34 | #ifndef VALGRIND
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| 35 | int fd;
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| 36 | int i;
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| 37 |
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| 38 | close(0);
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| 39 | close(1);
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| 40 |
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| 41 | if (stderr_too)
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| 42 | close(2);
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| 43 |
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| 44 | /* try and use up these file descriptors, so silly
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| 45 | library routines writing to stdout etc won't cause havoc */
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| 46 | for (i=0;i<3;i++) {
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| 47 | if (i == 2 && !stderr_too)
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| 48 | continue;
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| 49 |
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| 50 | fd = open("/dev/null",O_RDWR,0);
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| 51 | if (fd < 0)
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| 52 | fd = open("/dev/null",O_WRONLY,0);
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| 53 | if (fd < 0) {
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| 54 | DEBUG(0,("Can't open /dev/null\n"));
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| 55 | return;
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| 56 | }
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| 57 | if (fd != i) {
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| 58 | DEBUG(0,("Didn't get file descriptor %d\n",i));
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| 59 | return;
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| 60 | }
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| 61 | }
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| 62 | #endif
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| 63 | }
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| 64 |
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| 65 | /****************************************************************************
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| 66 | Become a daemon, discarding the controlling terminal.
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| 67 | ****************************************************************************/
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| 68 |
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| 69 | _PUBLIC_ void become_daemon(bool do_fork, bool no_process_group, bool log_stdout)
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| 70 | {
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| 71 | if (do_fork) {
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| 72 | if (sys_fork()) {
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| 73 | _exit(0);
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| 74 | }
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| 75 | }
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| 76 |
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| 77 | /* detach from the terminal */
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| 78 | #ifdef HAVE_SETSID
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| 79 | if (!no_process_group) setsid();
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| 80 | #elif defined(TIOCNOTTY)
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| 81 | if (!no_process_group) {
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| 82 | int i = sys_open("/dev/tty", O_RDWR, 0);
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| 83 | if (i != -1) {
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| 84 | ioctl(i, (int) TIOCNOTTY, (char *)0);
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| 85 | close(i);
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| 86 | }
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| 87 | }
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| 88 | #endif /* HAVE_SETSID */
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| 89 |
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| 90 | if (!log_stdout) {
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| 91 | /* Close fd's 0,1,2. Needed if started by rsh */
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| 92 | close_low_fds(false); /* Don't close stderr, let the debug system
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| 93 | attach it to the logfile */
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| 94 | }
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| 95 | }
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