sysdeps/unix/sysv/tcgetpgrp.c

   1 /* Copyright (C) 1992, 1997 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Library General Public License as
   6    published by the Free Software Foundation; either version 2 of the
   7    License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Library General Public License for more details.
  13
  14    You should have received a copy of the GNU Library General Public
  15    License along with the GNU C Library; see the file COPYING.LIB.  If not,
  16    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  17    Boston, MA 02111-1307, USA.  */
  18
  19 #include <termios.h>
  20 #include <sysv_termio.h>
  21 #include <errno.h>
  22 #include <unistd.h>
  23 #include <sys/types.h>
  24 #include <sys/ioctl.h>
  25
  26 /* Return the foreground process group ID of FD.  */
  27 pid_t
  28 tcgetpgrp (fd)
  29      int fd;
  30 {
  31   int pgrp;
  32   if (__ioctl (fd, _TIOCGPGRP, &pgrp) < 0)
  33     return (pid_t) -1;
  34   return (pid_t) pgrp;
  35 }