| 1 | /* Copyright (C) 2016-2022 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 License as |
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| 6 | published by the Free Software Foundation; either version 2.1 of the |
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| 7 | 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; see the file COPYING.LIB. If |
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| 16 | not, see <https://www.gnu.org/licenses/>. */ |
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| 17 | |
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| 18 | #include <unistd.h> |
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| 19 | #include <stdbool.h> |
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| 20 | #include <sys/sysmacros.h> |
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| 21 | #include <sys/types.h> |
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| 22 | #include <sys/stat.h> |
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| 23 | |
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| 24 | /* Return true if this is a UNIX98 pty device, as defined in |
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| 25 | linux/Documentation/devices.txt (on linux < 4.10) or |
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| 26 | linux/Documentation/admin-guide/devices.txt (on linux >= 4.10). */ |
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| 27 | static inline bool |
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| 28 | is_pty (struct __stat64_t64 *sb) |
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| 29 | { |
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| 30 | int m = __gnu_dev_major (dev: sb->st_rdev); |
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| 31 | return (136 <= m && m <= 143); |
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| 32 | } |
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| 33 | |
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| 34 | static inline bool |
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| 35 | is_mytty (const struct __stat64_t64 *mytty, const struct __stat64_t64 *maybe) |
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| 36 | { |
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| 37 | return (maybe->st_ino == mytty->st_ino |
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| 38 | && maybe->st_dev == mytty->st_dev |
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| 39 | && S_ISCHR (maybe->st_mode) |
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| 40 | && maybe->st_rdev == mytty->st_rdev |
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| 41 | ); |
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| 42 | } |
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| 43 | |
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