60 lines
2.5 KiB
C
60 lines
2.5 KiB
C
/* System-specific extensions of <unistd.h>, Linux version.
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Copyright (C) 2019-2021 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#ifndef _UNISTD_H
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# error "Never include <bits/unistd_ext.h> directly; use <unistd.h> instead."
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#endif
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#ifdef __USE_GNU
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/* Return the kernel thread ID (TID) of the current thread. The
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returned value is not subject to caching. Most Linux system calls
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accept a TID in place of a PID. Using the TID to change properties
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of a thread that has been created using pthread_create can lead to
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undefined behavior (comparable to manipulating file descriptors
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directly that have not been created explicitly). Note that a TID
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uniquely identifies a thread only while this thread is running; a
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TID can be reused once a thread has exited, even if the thread is
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not detached and has not been joined. */
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extern __pid_t gettid (void) __THROW;
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#ifdef __has_include
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# if __has_include ("linux/close_range.h")
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# include "linux/close_range.h"
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# endif
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#endif
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/* Unshare the file descriptor table before closing file descriptors. */
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#ifndef CLOSE_RANGE_UNSHARE
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# define CLOSE_RANGE_UNSHARE (1U << 1)
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#endif
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/* Set the FD_CLOEXEC bit instead of closing the file descriptor. */
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#ifndef CLOSE_RANGE_CLOEXEC
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# define CLOSE_RANGE_CLOEXEC (1U << 2)
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#endif
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/* Close all file descriptors in the range FD up to MAX_FD. The flag FLAGS
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are define by the CLOSE_RANGE prefix. This function behaves like close
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on the range, but in a fail-safe where it will either fail and not close
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any file descriptor or close all of them. Gaps where the file descriptor
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is invalid are ignored. Returns 0 on successor or -1 for failure (and
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sets errno accordingly). */
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extern int close_range (unsigned int __fd, unsigned int __max_fd,
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int __flags) __THROW;
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#endif /* __USE_GNU */
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