2.11BSD#431 - /usr/src/lib/libc/gen/daemon.c

   1: /*-
   2:  * Copyright (c) 1990, 1993
   3:  *	The Regents of the University of California.  All rights reserved.
   4:  *
   5:  * Redistribution and use in source and binary forms, with or without
   6:  * modification, are permitted provided that the following conditions
   7:  * are met:
   8:  * 1. Redistributions of source code must retain the above copyright
   9:  *    notice, this list of conditions and the following disclaimer.
  10:  * 2. Redistributions in binary form must reproduce the above copyright
  11:  *    notice, this list of conditions and the following disclaimer in the
  12:  *    documentation and/or other materials provided with the distribution.
  13:  * 3. All advertising materials mentioning features or use of this software
  14:  *    must display the following acknowledgement:
  15:  *	This product includes software developed by the University of
  16:  *	California, Berkeley and its contributors.
  17:  * 4. Neither the name of the University nor the names of its contributors
  18:  *    may be used to endorse or promote products derived from this software
  19:  *    without specific prior written permission.
  20:  *
  21:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31:  * SUCH DAMAGE.
  32:  */
  33: 
  34: #if defined(LIBC_SCCS) && !defined(lint)
  35: static char sccsid[] = "@(#)daemon.c	8.1.1 (2.11BSD GTE) 2/3/95";
  36: #endif /* LIBC_SCCS and not lint */
  37: 
  38: #include <fcntl.h>
  39: #include <sys/ioctl.h>
  40: #include <paths.h>
  41: 
  42: int
  43: daemon(nochdir, noclose)
  44:     int nochdir, noclose;
  45: {
  46:     register int fd;
  47: 
  48:     switch (fork()) {
  49:     case -1:
  50:         return (-1);
  51:     case 0:
  52:         break;
  53:     default:
  54:         _exit(0);
  55:     }
  56: 
  57:     if ((fd = open(_PATH_TTY, O_RDWR)) >= 0) {
  58:         ioctl(fd, TIOCNOTTY, 0);
  59:         close(fd);
  60:     }
  61: 
  62:     if (!nochdir)
  63:         (void)chdir("/");
  64: 
  65:     if (!noclose && (fd = open(_PATH_DEVNULL, O_RDWR, 0)) != -1) {
  66:         (void)dup2(fd, 0);
  67:         (void)dup2(fd, 1);
  68:         (void)dup2(fd, 2);
  69:         if (fd > 2)
  70:             (void)close(fd);
  71:     }
  72:     return(0);
  73: }

Defined functions

Defined variables