| lh | 9ed821d | 2023-04-07 01:36:19 -0700 | [diff] [blame] | 1 | /* Copyright (C) 1998 Free Software Foundation, Inc. |
| 2 | This file is part of the GNU C Library. |
| 3 | Contributed by Zack Weinberg <zack@rabi.phys.columbia.edu>, 1998. |
| 4 | |
| 5 | The GNU C Library is free software; you can redistribute it and/or |
| 6 | modify it under the terms of the GNU Library General Public License as |
| 7 | published by the Free Software Foundation; either version 2 of the |
| 8 | License, or (at your option) any later version. |
| 9 | |
| 10 | The GNU C Library is distributed in the hope that it will be useful, |
| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 13 | Library General Public License for more details. |
| 14 | |
| 15 | You should have received a copy of the GNU Library General Public |
| 16 | License along with the GNU C Library; see the file COPYING.LIB. If not, |
| 17 | write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, |
| 18 | Boston, MA 02111-1307, USA. */ |
| 19 | |
| 20 | #include <errno.h> |
| 21 | #include <stdlib.h> |
| 22 | #include <sys/ioctl.h> |
| 23 | #include <termios.h> |
| 24 | |
| 25 | |
| 26 | /* Unlock the slave pseudo terminal associated with the master pseudo |
| 27 | terminal specified by FD. */ |
| 28 | int |
| 29 | unlockpt (int fd) |
| 30 | { |
| 31 | #ifdef TIOCSPTLCK |
| 32 | int save_errno = errno; |
| 33 | int unlock = 0; |
| 34 | |
| 35 | if (ioctl (fd, TIOCSPTLCK, &unlock)) |
| 36 | { |
| 37 | if (errno == EINVAL) |
| 38 | { |
| 39 | errno = save_errno; |
| 40 | return 0; |
| 41 | } |
| 42 | else |
| 43 | return -1; |
| 44 | } |
| 45 | #endif |
| 46 | /* If we have no TIOCSPTLCK ioctl, all slave pseudo terminals are |
| 47 | unlocked by default. */ |
| 48 | return 0; |
| 49 | } |