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author | Adhemerval Zanella <adhemerval.zanella@linaro.org> | 2016-11-21 17:26:35 -0200 |
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committer | Adhemerval Zanella <adhemerval.zanella@linaro.org> | 2017-05-18 18:06:47 -0300 |
commit | 88499a87cef0a70f381524b9c4951b53bc5184e3 (patch) | |
tree | b9a4033cd8da062f69f9235c15f58ee32d1b0f14 /sysdeps/unix/sysv/linux/generic | |
parent | a7fbedff76494b5b694f647e9c681cf8988056ce (diff) | |
download | glibc-88499a87cef0a70f381524b9c4951b53bc5184e3.tar.gz |
posix: Consolidate Linux pause syscall
This patch consolidates the pause Linux implementation on
sysdeps/unix/sysv/linux/pause.c. If defined the pause syscall
(__NR_pause) will be used, other ppoll with 0 arguments will be
used instead.
It has the small advantage of generic pause implementation with
uses rt_sigprocmask plus rt_sigsuspend because it requires only
one syscall and the pause is done atomically regarding signal
handling (for instance, pause may not be interrupted if the
signal arrives between the rt_sigprocmask and rt_sigsuspend
syscall).
Checked on i686-linux-gnu, x86_64-linux-gnu, x86_64-linux-gnux32,
arch64-linux-gnu, arm-linux-gnueabihf, powerpc64le-linux-gnu,
sparc64-linux-gnu, and sparcv9-linux-gnu.
* sysdeps/unix/sysv/linux/generic/pause.c: Remove file.
* sysdeps/unix/sysv/linux/sparc/sparc64/pause.c: Likewise.
* sysdeps/unix/sysv/linux/sparc/kernel-features.h [__arch64__]
(__NR_pause): Undefine.
* sysdeps/unix/sysv/linux/pause.c: New file.
* sysdeps/unix/sysv/linux/syscalls.list: Remove pause from
auto-generation list.
Diffstat (limited to 'sysdeps/unix/sysv/linux/generic')
-rw-r--r-- | sysdeps/unix/sysv/linux/generic/pause.c | 39 |
1 files changed, 0 insertions, 39 deletions
diff --git a/sysdeps/unix/sysv/linux/generic/pause.c b/sysdeps/unix/sysv/linux/generic/pause.c deleted file mode 100644 index a8b3e33a6c..0000000000 --- a/sysdeps/unix/sysv/linux/generic/pause.c +++ /dev/null @@ -1,39 +0,0 @@ -/* Copyright (C) 2011-2017 Free Software Foundation, Inc. - This file is part of the GNU C Library. - Contributed by Chris Metcalf <cmetcalf@tilera.com>, 2011. - - 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 - <http://www.gnu.org/licenses/>. */ - -#include <signal.h> -#include <unistd.h> -#include <sysdep-cancel.h> - -/* Suspend the process until a signal arrives. - This always returns -1 and sets errno to EINTR. */ - -int -__libc_pause (void) -{ - sigset_t set; - - int rc = - SYSCALL_CANCEL (rt_sigprocmask, SIG_BLOCK, NULL, &set, _NSIG / 8); - if (rc == 0) - rc = SYSCALL_CANCEL (rt_sigsuspend, &set, _NSIG / 8); - - return rc; -} - -weak_alias (__libc_pause, pause) |