| 1 | /* Copyright (C) 1998-2022 Free Software Foundation, Inc. |
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| 2 | This file is part of the GNU C Library. |
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| 3 | |
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| 4 | The GNU C Library is free software; you can redistribute it and/or |
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| 5 | modify it under the terms of the GNU Lesser General Public |
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| 6 | License as published by the Free Software Foundation; either |
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| 7 | version 2.1 of the License, or (at your option) any later version. |
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| 8 | |
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| 9 | The GNU C Library is distributed in the hope that it will be useful, |
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| 10 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 12 | Lesser General Public License for more details. |
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| 13 | |
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| 14 | You should have received a copy of the GNU Lesser General Public |
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| 15 | License along with the GNU C Library; if not, see |
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| 16 | <https://www.gnu.org/licenses/>. */ |
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| 17 | |
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| 18 | #include <paths.h> |
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| 19 | #include <stdlib.h> |
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| 20 | #include <string.h> |
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| 21 | #include <unistd.h> |
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| 22 | #include <errno.h> |
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| 23 | |
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| 24 | |
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| 25 | /* Unlock the slave pseudo terminal associated with the master pseudo |
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| 26 | terminal specified by FD. */ |
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| 27 | int |
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| 28 | unlockpt (int fd) |
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| 29 | { |
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| 30 | char buf[sizeof (_PATH_TTY) + 2]; |
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| 31 | |
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| 32 | /* BSD doesn't have a lock, but it does have `revoke'. */ |
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| 33 | if (__ptsname_r (fd, buf, sizeof (buf))) |
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| 34 | { |
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| 35 | if (errno == ENOTTY) |
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| 36 | __set_errno (EINVAL); |
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| 37 | return -1; |
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| 38 | } |
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| 39 | return __revoke (file: buf); |
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| 40 | } |
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| 41 | libc_hidden_def (unlockpt) |
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| 42 | |
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