| 1 | /* |
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| 2 | * xdm - display manager daemon |
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| 3 | * |
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| 4 | * $XConsortium: daemon.c,v 1.8 91/05/11 15:37:38 gildea Exp $ |
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| 5 | * |
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| 6 | * Copyright 1988 Massachusetts Institute of Technology |
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| 7 | * |
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| 8 | * Permission to use, copy, modify, and distribute this software and its |
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| 9 | * documentation for any purpose and without fee is hereby granted, provided |
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| 10 | * that the above copyright notice appear in all copies and that both that |
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| 11 | * copyright notice and this permission notice appear in supporting |
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| 12 | * documentation, and that the name of M.I.T. not be used in advertising or |
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| 13 | * publicity pertaining to distribution of the software without specific, |
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| 14 | * written prior permission. M.I.T. makes no representations about the |
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| 15 | * suitability of this software for any purpose. It is provided "as is" |
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| 16 | * without express or implied warranty. |
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| 17 | * |
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| 18 | * Author: Keith Packard, MIT X Consortium |
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| 19 | */ |
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| 20 | |
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| 21 | #include <X11/Xos.h> |
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| 22 | |
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| 23 | #ifdef SVR4 |
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| 24 | #include <termios.h> |
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| 25 | #else |
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| 26 | #include <sys/ioctl.h> |
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| 27 | #endif |
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| 28 | |
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| 29 | #ifdef hpux |
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| 30 | #include <sys/ptyio.h> |
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| 31 | #endif |
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| 32 | |
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| 33 | extern void exit (); |
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| 34 | |
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| 35 | BecomeOrphan () |
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| 36 | { |
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| 37 | /* |
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| 38 | * fork so that the process goes into the background automatically. Also |
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| 39 | * has a nice side effect of having the child process get inherited by |
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| 40 | * init (pid 1). |
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| 41 | */ |
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| 42 | |
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| 43 | if (fork ()) |
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| 44 | exit (0); |
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| 45 | } |
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| 46 | |
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| 47 | BecomeDaemon () |
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| 48 | { |
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| 49 | register int i; |
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| 50 | |
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| 51 | /* |
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| 52 | * Close standard file descriptors and get rid of controlling tty |
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| 53 | */ |
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| 54 | |
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| 55 | #if defined(SYSV) || defined(SVR4) |
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| 56 | setpgrp (); |
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| 57 | #else |
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| 58 | setpgrp (0, getpid()); |
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| 59 | #endif |
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| 60 | |
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| 61 | close (0); |
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| 62 | close (1); |
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| 63 | close (2); |
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| 64 | |
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| 65 | #ifndef SYSV386 |
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| 66 | if ((i = open ("/dev/tty", O_RDWR)) >= 0) { /* did open succeed? */ |
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| 67 | #if (defined(SYSV) || defined(SVR4)) && defined(TIOCTTY) |
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| 68 | int zero = 0; |
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| 69 | (void) ioctl (i, TIOCTTY, &zero); |
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| 70 | #else |
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| 71 | (void) ioctl (i, TIOCNOTTY, (char *) 0); /* detach, BSD style */ |
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| 72 | #endif |
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| 73 | (void) close (i); |
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| 74 | } |
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| 75 | #endif /* !SYSV386 */ |
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| 76 | |
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| 77 | /* |
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| 78 | * Set up the standard file descriptors. |
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| 79 | */ |
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| 80 | (void) open ("/", O_RDONLY); /* root inode already in core */ |
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| 81 | (void) dup2 (0, 1); |
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| 82 | (void) dup2 (0, 2); |
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| 83 | } |
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