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glibc  2.9
tcgetpgrp.c
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00001 /* Copyright (C) 1992, 1997, 2002 Free Software Foundation, Inc.
00002    This file is part of the GNU C Library.
00003 
00004    The GNU C Library is free software; you can redistribute it and/or
00005    modify it under the terms of the GNU Lesser General Public
00006    License as published by the Free Software Foundation; either
00007    version 2.1 of the License, or (at your option) any later version.
00008 
00009    The GNU C Library is distributed in the hope that it will be useful,
00010    but WITHOUT ANY WARRANTY; without even the implied warranty of
00011    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00012    Lesser General Public License for more details.
00013 
00014    You should have received a copy of the GNU Lesser General Public
00015    License along with the GNU C Library; if not, write to the Free
00016    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
00017    02111-1307 USA.  */
00018 
00019 #include <termios.h>
00020 #include <sysv_termio.h>
00021 #include <errno.h>
00022 #include <unistd.h>
00023 #include <sys/types.h>
00024 #include <sys/ioctl.h>
00025 
00026 /* Return the foreground process group ID of FD.  */
00027 pid_t
00028 tcgetpgrp (fd)
00029      int fd;
00030 {
00031   int pgrp;
00032   if (__ioctl (fd, _TIOCGPGRP, &pgrp) < 0)
00033     return (pid_t) -1;
00034   return (pid_t) pgrp;
00035 }
00036 libc_hidden_def (tcgetpgrp)