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glibc  2.9
unlockpt.c
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00001 /* Copyright (C) 1998 Free Software Foundation, Inc.
00002    This file is part of the GNU C Library.
00003    Contributed by Zack Weinberg <zack@rabi.phys.columbia.edu>, 1998.
00004 
00005    The GNU C Library is free software; you can redistribute it and/or
00006    modify it under the terms of the GNU Lesser General Public
00007    License as published by the Free Software Foundation; either
00008    version 2.1 of the License, or (at your option) any later version.
00009 
00010    The GNU C Library is distributed in the hope that it will be useful,
00011    but WITHOUT ANY WARRANTY; without even the implied warranty of
00012    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00013    Lesser General Public License for more details.
00014 
00015    You should have received a copy of the GNU Lesser General Public
00016    License along with the GNU C Library; if not, write to the Free
00017    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
00018    02111-1307 USA.  */
00019 
00020 #include <paths.h>
00021 #include <stdlib.h>
00022 #include <string.h>
00023 #include <unistd.h>
00024 
00025 
00026 /* Unlock the slave pseudo terminal associated with the master pseudo
00027    terminal specified by FD.  */
00028 int
00029 unlockpt (int fd)
00030 {
00031   char buf[sizeof (_PATH_TTY) + 2];
00032 
00033   /* BSD doesn't have a lock, but it does have `revoke'.  */
00034   if (__ptsname_r (fd, buf, sizeof (buf)))
00035     return -1;
00036   return revoke (buf);
00037 }