| 1 | /* System-specific extensions of <unistd.h>, Linux version. |
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| 2 | Copyright (C) 2019-2022 Free Software Foundation, Inc. |
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| 3 | This file is part of the GNU C Library. |
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| 4 | |
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| 5 | The GNU C Library is free software; you can redistribute it and/or |
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| 6 | modify it under the terms of the GNU Lesser General Public |
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| 7 | License as published by the Free Software Foundation; either |
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| 8 | version 2.1 of the License, or (at your option) any later version. |
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| 9 | |
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| 10 | The GNU C Library is distributed in the hope that it will be useful, |
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| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 13 | Lesser General Public License for more details. |
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| 14 | |
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| 15 | You should have received a copy of the GNU Lesser General Public |
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| 16 | License along with the GNU C Library; if not, see |
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| 17 | <https://www.gnu.org/licenses/>. */ |
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| 18 | |
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| 19 | #ifndef _UNISTD_H |
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| 20 | # error "Never include <bits/unistd_ext.h> directly; use <unistd.h> instead." |
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| 21 | #endif |
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| 22 | |
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| 23 | #ifdef __USE_GNU |
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| 24 | |
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| 25 | /* Return the kernel thread ID (TID) of the current thread. The |
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| 26 | returned value is not subject to caching. Most Linux system calls |
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| 27 | accept a TID in place of a PID. Using the TID to change properties |
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| 28 | of a thread that has been created using pthread_create can lead to |
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| 29 | undefined behavior (comparable to manipulating file descriptors |
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| 30 | directly that have not been created explicitly). Note that a TID |
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| 31 | uniquely identifies a thread only while this thread is running; a |
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| 32 | TID can be reused once a thread has exited, even if the thread is |
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| 33 | not detached and has not been joined. */ |
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| 34 | extern __pid_t gettid (void) __THROW; |
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| 35 | |
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| 36 | #ifdef __has_include |
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| 37 | # if __has_include ("linux/close_range.h") |
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| 38 | # include "linux/close_range.h" |
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| 39 | # endif |
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| 40 | #endif |
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| 41 | /* Unshare the file descriptor table before closing file descriptors. */ |
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| 42 | #ifndef CLOSE_RANGE_UNSHARE |
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| 43 | # define CLOSE_RANGE_UNSHARE (1U << 1) |
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| 44 | #endif |
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| 45 | /* Set the FD_CLOEXEC bit instead of closing the file descriptor. */ |
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| 46 | #ifndef CLOSE_RANGE_CLOEXEC |
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| 47 | # define CLOSE_RANGE_CLOEXEC (1U << 2) |
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| 48 | #endif |
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| 49 | |
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| 50 | #endif /* __USE_GNU */ |
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| 51 | |
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