chiark / gitweb /
Infrastructure: Split the files into subdirectories.
[mLib] / sys / daemonize.c
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1/* -*-c-*-
2 *
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3 * Become a daemon, detaching from terminals
4 *
5 * (c) 2007 Straylight/Edgeware
6 */
7
d4efbcd9 8/*----- Licensing notice --------------------------------------------------*
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9 *
10 * This file is part of the mLib utilities library.
11 *
12 * mLib is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU Library General Public License as
14 * published by the Free Software Foundation; either version 2 of the
15 * License, or (at your option) any later version.
d4efbcd9 16 *
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17 * mLib is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU Library General Public License for more details.
d4efbcd9 21 *
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22 * You should have received a copy of the GNU Library General Public
23 * License along with mLib; if not, write to the Free
24 * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
25 * MA 02111-1307, USA.
26 */
27
28/*----- Header files ------------------------------------------------------*/
29
30#include <sys/types.h>
31#include <unistd.h>
32#include <fcntl.h>
33#include <sys/ioctl.h>
34
35#include "daemonize.h"
36
37/*----- Main code ---------------------------------------------------------*/
38
39/* --- @detachtty@ --- *
40 *
41 * Arguments: ---
42 *
43 * Returns: ---
44 *
45 * Use: Detaches from the current terminal and ensures it can never
46 * acquire a new one. Calls @fork@.
47 */
48
49void detachtty(void)
50{
51#ifdef TIOCNOTTY
52 {
53 int fd;
54 if ((fd = open("/dev/tty", O_RDONLY)) >= 0) {
55 ioctl(fd, TIOCNOTTY);
56 close(fd);
57 }
58 }
59#endif
60 setsid();
61 if (fork() > 0)
62 _exit(0);
63}
64
65/* --- @daemonize@ --- *
66 *
67 * Arguments: ---
68 *
69 * Returns: Zero if OK, nonzero on failure.
70 *
71 * Use: Becomes a daemon.
72 */
73
74int daemonize(void)
75{
76 pid_t kid;
77
78 if ((kid = fork()) < 0)
79 return (-1);
80 if (kid)
81 _exit(0);
82 detachtty();
83 return (0);
84}
85
86/*----- That's all, folks -------------------------------------------------*/