diff options
Diffstat (limited to 'gnu/libexec/uucp/libunix/detach.c')
| -rw-r--r-- | gnu/libexec/uucp/libunix/detach.c | 184 |
1 files changed, 0 insertions, 184 deletions
diff --git a/gnu/libexec/uucp/libunix/detach.c b/gnu/libexec/uucp/libunix/detach.c deleted file mode 100644 index ad753b4..0000000 --- a/gnu/libexec/uucp/libunix/detach.c +++ /dev/null @@ -1,184 +0,0 @@ -/* detach.c - Detach from the controlling terminal. - - Copyright (C) 1992, 1993, 1995 Ian Lance Taylor - - This file is part of the Taylor UUCP package. - - This program is free software; you can redistribute it and/or - modify it under the terms of the GNU General Public License as - published by the Free Software Foundation; either version 2 of the - License, or (at your option) any later version. - - This program is distributed in the hope that it will be useful, but - WITHOUT ANY WARRANTY; without even the implied warranty of - MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - General Public License for more details. - - You should have received a copy of the GNU General Public License - along with this program; if not, write to the Free Software - Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. - - The author of the program may be contacted at ian@airs.com or - c/o Cygnus Support, 48 Grove Street, Somerville, MA 02144. - */ - -/* $FreeBSD$ */ - -#include "uucp.h" - -#include "uudefs.h" -#include "system.h" -#include "sysdep.h" - -#include <errno.h> -#include <paths.h> - -#if HAVE_SYS_IOCTL_H -#include <sys/ioctl.h> -#endif - -#ifdef TIOCNOTTY -#define HAVE_TIOCNOTTY 1 -#else -#define HAVE_TIOCNOTTY 0 -#endif - -#if HAVE_FCNTL_H -#include <fcntl.h> -#else -#if HAVE_SYS_FILE_H -#include <sys/file.h> -#endif -#endif - -#ifndef O_RDONLY -#define O_RDONLY 0 -#define O_WRONLY 1 -#define O_RDWR 2 -#endif - -#if HAVE_BROKEN_SETSID -#undef HAVE_SETSID -#define HAVE_SETSID 0 -#endif - -/* Detach from the controlling terminal. This is called by uucico if - it is calling out to another system, so that it can receive SIGHUP - signals from the port it calls out on. It is also called by uucico - just before it starts uuxqt, so that uuxqt is completely - independent of the terminal. */ - -void -usysdep_detach () -{ - pid_t igrp; - - /* Make sure that we can open the log file. We do this now so that, - if we can't, a message will be written to stderr. After we leave - this routine, stderr will be closed. */ - ulog (LOG_NORMAL, (const char *) NULL); - - /* Make sure we are not a process group leader. */ -#if HAVE_BSD_PGRP - igrp = getpgrp (0); -#else - igrp = getpgrp (); -#endif - - if (igrp == getpid ()) - { - boolean fignored; - pid_t ipid; - - /* Ignore SIGHUP, since our process group leader is about to - die. */ - usset_signal (SIGHUP, SIG_IGN, FALSE, &fignored); - - ipid = ixsfork (); - if (ipid < 0) - ulog (LOG_FATAL, "fork: %s", strerror (errno)); - - if (ipid != 0) - _exit (EXIT_SUCCESS); - - /* We'll always wind up as a child of process number 1, right? - Right? We have to wait for our parent to die before - reenabling SIGHUP. */ - while (getppid () != 1) - sleep (1); - - ipid = getpid (); - ulog_id (ipid); - - /* Restore SIGHUP catcher if it wasn't being ignored. */ - if (! fignored) - usset_signal (SIGHUP, ussignal, TRUE, (boolean *) NULL); - - DEBUG_MESSAGE2 (DEBUG_PORT, - "usysdep_detach: Forked; old PID %ld, new pid %ld", - (long) igrp, (long) ipid); - } - -#if ! HAVE_SETSID && HAVE_TIOCNOTTY - /* Lose the original controlling terminal as well as our process - group. */ - { - int o; - - o = open ((char *) _PATH_TTY, O_RDONLY); - if (o >= 0) - { - (void) ioctl (o, TIOCNOTTY, (char *) NULL); - (void) close (o); - } - } -#endif /* ! HAVE_SETSID && HAVE_TIOCNOTTY */ - - /* Close stdin, stdout and stderr and reopen them on /dev/null, to - make sure we have no connection at all to the terminal. */ - (void) close (0); - (void) close (1); - (void) close (2); - if (open ((char *) _PATH_DEVNULL, O_RDONLY) != 0 - || open ((char *) _PATH_DEVNULL, O_WRONLY) != 1 - || open ((char *) _PATH_DEVNULL, O_WRONLY) != 2) - ulog (LOG_FATAL, "open (%s): %s", _PATH_DEVNULL, strerror (errno)); - -#if HAVE_SETSID - - /* Under POSIX the setsid call creates a new session for which we - are the process group leader. It also detaches us from our - controlling terminal. */ - if (setsid () < 0) - ulog (LOG_ERROR, "setsid: %s", strerror (errno)); - -#else /* ! HAVE_SETSID */ - -#if ! HAVE_SETPGRP - #error Cannot detach from controlling terminal -#endif - - /* If we don't have setsid, we must use setpgrp. On an old System V - system setpgrp will make us the leader of a new process group and - detach the controlling terminal. On an old BSD system the call - setpgrp (0, 0) will set our process group to 0 so that we can - acquire a new controlling terminal (TIOCNOTTY may or may not have - already done that anyhow). */ -#if HAVE_BSD_PGRP - if (setpgrp (0, 0) < 0) -#else - if (setpgrp () < 0) -#endif - { - /* Some systems seem to give EPERM errors inappropriately. */ - if (errno != EPERM) - ulog (LOG_ERROR, "setpgrp: %s", strerror (errno)); - } - -#endif /* ! HAVE_SETSID */ - - /* At this point we have completely detached from our controlling - terminal. The next terminal device we open will probably become - our controlling terminal. */ -} |
