139 lines
3.1 KiB
C
139 lines
3.1 KiB
C
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/*
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Copyright (c) 1988 X Consortium
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Permission is hereby granted, free of charge, to any person obtaining
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a copy of this software and associated documentation files (the
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"Software"), to deal in the Software without restriction, including
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without limitation the rights to use, copy, modify, merge, publish,
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distribute, sublicense, and/or sell copies of the Software, and to
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permit persons to whom the Software is furnished to do so, subject to
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the following conditions:
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The above copyright notice and this permission notice shall be included
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in all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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IN NO EVENT SHALL THE X CONSORTIUM BE LIABLE FOR ANY CLAIM, DAMAGES OR
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OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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OTHER DEALINGS IN THE SOFTWARE.
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Except as contained in this notice, the name of the X Consortium shall
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not be used in advertising or otherwise to promote the sale, use or
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other dealings in this Software without prior written authorization
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from the X Consortium.
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*/
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/* $XFree86: xc/programs/xfs/os/daemon.c,v 1.12 2002/10/20 21:42:50 tsi Exp $ */
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#include <X11/Xos.h>
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#include <sys/types.h>
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#include <errno.h>
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#include <stdlib.h>
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#if defined(USG)
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# include <termios.h>
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#else
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# include <sys/ioctl.h>
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#endif
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#ifdef hpux
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# include <sys/ptyio.h>
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#endif
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#ifdef X_NOT_POSIX
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# define Pid_t int
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#else
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# define Pid_t pid_t
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#endif
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#include "os.h"
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#if defined(__GLIBC__) || defined(CSRG_BASED)
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#define HAS_DAEMON
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#endif
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#ifndef X_NOT_POSIX
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#define HAS_SETSID
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#endif
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#ifndef HAS_SETSID
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#define setsid() MySetsid()
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static Pid_t
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MySetsid(void)
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{
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#if defined(TIOCNOTTY) || defined(TCCLRCTTY) || defined(TIOCTTY)
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int fd;
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#endif
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int stat;
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fd = open("/dev/tty", O_RDWR);
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if (fd >= 0) {
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#if defined(USG) && defined(TCCLRCTTY)
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int zero = 0;
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(void) ioctl (fd, TCCLRCTTY, &zero);
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#elif (defined(SYSV) || defined(SVR4)) && defined(TIOCTTY)
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int zero = 0;
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(void) ioctl (i, TIOCTTY, &zero);
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#elif defined(TIOCNOTTY)
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(void) ioctl (i, TIOCNOTTY, (char *) 0); /* detach, BSD style */
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#endif
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close(fd);
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}
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#if defined(SYSV) || defined(__QNXNTO__)
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return setpgrp();
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#else
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return setpgid(0, getpid());
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#endif
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}
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#endif /* !HAS_SETSID */
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/* detach */
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void
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BecomeDaemon ()
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{
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/* If our C library has the daemon() function, just use it. */
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#ifdef HAS_DAEMON
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daemon (0, 0);
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#else
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switch (fork()) {
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case -1:
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/* error */
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FatalError("daemon fork failed, %s\n", strerror(errno));
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break;
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case 0:
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/* child */
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break;
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default:
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/* parent */
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exit(0);
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}
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if (setsid() == -1)
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FatalError("setting session id for daemon failed: %s\n",
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strerror(errno));
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chdir("/");
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close (0);
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close (1);
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close (2);
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/*
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* Set up the standard file descriptors.
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*/
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(void) open ("/dev/null", O_RDWR);
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(void) dup2 (0, 1);
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(void) dup2 (0, 2);
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#endif /* HAS_DAEMON */
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}
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