glibc/sysdeps/unix/sysv/linux/bits/unistd_ext.h
Paul Eggert 581c785bf3 Update copyright dates with scripts/update-copyrights
I used these shell commands:

../glibc/scripts/update-copyrights $PWD/../gnulib/build-aux/update-copyright
(cd ../glibc && git commit -am"[this commit message]")

and then ignored the output, which consisted lines saying "FOO: warning:
copyright statement not found" for each of 7061 files FOO.

I then removed trailing white space from math/tgmath.h,
support/tst-support-open-dev-null-range.c, and
sysdeps/x86_64/multiarch/strlen-vec.S, to work around the following
obscure pre-commit check failure diagnostics from Savannah.  I don't
know why I run into these diagnostics whereas others evidently do not.

remote: *** 912-#endif
remote: *** 913:
remote: *** 914-
remote: *** error: lines with trailing whitespace found
...
remote: *** error: sysdeps/unix/sysv/linux/statx_cp.c: trailing lines
2022-01-01 11:40:24 -08:00

51 lines
2.0 KiB
C

/* System-specific extensions of <unistd.h>, Linux version.
Copyright (C) 2019-2022 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#ifndef _UNISTD_H
# error "Never include <bits/unistd_ext.h> directly; use <unistd.h> instead."
#endif
#ifdef __USE_GNU
/* Return the kernel thread ID (TID) of the current thread. The
returned value is not subject to caching. Most Linux system calls
accept a TID in place of a PID. Using the TID to change properties
of a thread that has been created using pthread_create can lead to
undefined behavior (comparable to manipulating file descriptors
directly that have not been created explicitly). Note that a TID
uniquely identifies a thread only while this thread is running; a
TID can be reused once a thread has exited, even if the thread is
not detached and has not been joined. */
extern __pid_t gettid (void) __THROW;
#ifdef __has_include
# if __has_include ("linux/close_range.h")
# include "linux/close_range.h"
# endif
#endif
/* Unshare the file descriptor table before closing file descriptors. */
#ifndef CLOSE_RANGE_UNSHARE
# define CLOSE_RANGE_UNSHARE (1U << 1)
#endif
/* Set the FD_CLOEXEC bit instead of closing the file descriptor. */
#ifndef CLOSE_RANGE_CLOEXEC
# define CLOSE_RANGE_CLOEXEC (1U << 2)
#endif
#endif /* __USE_GNU */