| | 1 | /* -*-c-*- |
| | 2 | * |
| | 3 | * Become a daemon, detaching from terminals |
| | 4 | * |
| | 5 | * (c) 2007 Straylight/Edgeware |
| | 6 | */ |
| | 7 | |
| | 8 | /*----- Licensing notice --------------------------------------------------* |
| | 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. |
| | 16 | * |
| | 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. |
| | 21 | * |
| | 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 -------------------------------------------------*/ |
~mdw / mLib / blame_incremental