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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 | ||
49 | void 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 | ||
74 | int 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 -------------------------------------------------*/ |