| /* Copyright (C) 1998 Free Software Foundation, Inc. |
| This file is part of the GNU C Library. |
| Contributed by Zack Weinberg <zack@rabi.phys.columbia.edu>, 1998. |
| |
| The GNU C Library is free software; you can redistribute it and/or |
| modify it under the terms of the GNU Lesser General Public |
| License as published by the Free Software Foundation; either |
| version 2.1 of the License, or (at your option) any later version. |
| |
| The GNU C Library is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| Lesser General Public License for more details. |
| |
| You should have received a copy of the GNU Lesser General Public |
| License along with the GNU C Library; if not, write to the Free |
| Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA |
| 02111-1307 USA. */ |
| |
| #include <errno.h> |
| #include <stdlib.h> |
| #include <sys/ioctl.h> |
| #include <termios.h> |
| |
| |
| /* Unlock the slave pseudo terminal associated with the master pseudo |
| terminal specified by FD. */ |
| int |
| unlockpt (int fd) |
| { |
| #ifdef TIOCSPTLCK |
| int save_errno = errno; |
| int unlock = 0; |
| |
| if (__ioctl (fd, TIOCSPTLCK, &unlock)) |
| { |
| if (errno == EINVAL) |
| { |
| __set_errno (save_errno); |
| return 0; |
| } |
| else |
| return -1; |
| } |
| #endif |
| /* If we have no TIOCSPTLCK ioctl, all slave pseudo terminals are |
| unlocked by default. */ |
| return 0; |
| } |
