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456b3c08b6
Now that Hurd implementis both close_range and closefrom (f2c996597d),
we can make close_range() a base ABI, and make the default closefrom()
implementation on top of close_range().
The generic closefrom() implementation based on __getdtablesize() is
moved to generic close_range(). On Linux it will be overriden by
the auto-generation syscall while on Hurd it will be a system specific
implementation.
The closefrom() now calls close_range() and __closefrom_fallback().
Since on Hurd close_range() does not fail, __closefrom_fallback() is an
empty static inline function set by__ASSUME_CLOSE_RANGE.
The __ASSUME_CLOSE_RANGE also allows optimize Linux
__closefrom_fallback() implementation when --enable-kernel=5.9 or
higher is used.
Finally the Linux specific tst-close_range.c is moved to io and
enabled as default. The Linuxism and CLOSE_RANGE_UNSHARE are
guarded so it can be built for Hurd (I have not actually test it).
Checked on x86_64-linux-gnu, i686-linux-gnu, and with a i686-gnu
build.
51 lines
2.0 KiB
C
51 lines
2.0 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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#endif /* __USE_GNU */
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