~mdw / mLib / blame
| Commit | Line | Data |
|---|---|---|
| 0683223a MW |
1 | /* -*-c-*- |
| 2 | * | |
| 3 | * $Id$ | |
| 4 | * | |
| 5 | * Become a daemon, detaching from terminals | |
| 6 | * | |
| 7 | * (c) 2007 Straylight/Edgeware | |
| 8 | */ | |
| 9 | ||
| d4efbcd9 | 10 | /*----- Licensing notice --------------------------------------------------* |
| 0683223a MW |
11 | * |
| 12 | * This file is part of the mLib utilities library. | |
| 13 | * | |
| 14 | * mLib is free software; you can redistribute it and/or modify | |
| 15 | * it under the terms of the GNU Library General Public License as | |
| 16 | * published by the Free Software Foundation; either version 2 of the | |
| 17 | * License, or (at your option) any later version. | |
| d4efbcd9 | 18 | * |
| 0683223a MW |
19 | * mLib is distributed in the hope that it will be useful, |
| 20 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 21 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| 22 | * GNU Library General Public License for more details. | |
| d4efbcd9 | 23 | * |
| 0683223a MW |
24 | * You should have received a copy of the GNU Library General Public |
| 25 | * License along with mLib; if not, write to the Free | |
| 26 | * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, | |
| 27 | * MA 02111-1307, USA. | |
| 28 | */ | |
| 29 | ||
| 30 | /*----- Header files ------------------------------------------------------*/ | |
| 31 | ||
| 32 | #include <sys/types.h> | |
| 33 | #include <unistd.h> | |
| 34 | #include <fcntl.h> | |
| 35 | #include <sys/ioctl.h> | |
| 36 | ||
| 37 | #include "daemonize.h" | |
| 38 | ||
| 39 | /*----- Main code ---------------------------------------------------------*/ | |
| 40 | ||
| 41 | /* --- @detachtty@ --- * | |
| 42 | * | |
| 43 | * Arguments: --- | |
| 44 | * | |
| 45 | * Returns: --- | |
| 46 | * | |
| 47 | * Use: Detaches from the current terminal and ensures it can never | |
| 48 | * acquire a new one. Calls @fork@. | |
| 49 | */ | |
| 50 | ||
| 51 | void detachtty(void) | |
| 52 | { | |
| 53 | #ifdef TIOCNOTTY | |
| 54 | { | |
| 55 | int fd; | |
| 56 | if ((fd = open("/dev/tty", O_RDONLY)) >= 0) { | |
| 57 | ioctl(fd, TIOCNOTTY); | |
| 58 | close(fd); | |
| 59 | } | |
| 60 | } | |
| 61 | #endif | |
| 62 | setsid(); | |
| 63 | if (fork() > 0) | |
| 64 | _exit(0); | |
| 65 | } | |
| 66 | ||
| 67 | /* --- @daemonize@ --- * | |
| 68 | * | |
| 69 | * Arguments: --- | |
| 70 | * | |
| 71 | * Returns: Zero if OK, nonzero on failure. | |
| 72 | * | |
| 73 | * Use: Becomes a daemon. | |
| 74 | */ | |
| 75 | ||
| 76 | int daemonize(void) | |
| 77 | { | |
| 78 | pid_t kid; | |
| 79 | ||
| 80 | if ((kid = fork()) < 0) | |
| 81 | return (-1); | |
| 82 | if (kid) | |
| 83 | _exit(0); | |
| 84 | detachtty(); | |
| 85 | return (0); | |
| 86 | } | |
| 87 | ||
| 88 | /*----- That's all, folks -------------------------------------------------*/ |