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8b0e795aaa
This patch simplifies sig{timed}wait{info} by:
- Assuming __NR_rt_sigtimedwait existence on all architectures due minimum
kernel version requirement (it pre-dates Linux git inclusion for Linux
2.6.12).
- Call __sigtimedwait on both sigwait and sigwaitinfo.
- Now that sigwait is based on an internal sigtimedwait call and it is
present of both libc.so and libpthread.so we need to add an external
private definition of __sigtimedwait for libpthread.so call.
Checked on x86_64-linux-gnu.
* sysdeps/unix/sysv/linux/Versions (libc) [GLIBC_PRIVATE]: Add
__sigtimedwait.
* sysdeps/unix/sysv/linux/sigtimedwait.c: Simplify includes and
assume __NR_rt_sigtimedwait.
* sysdeps/unix/sysv/linux/sigwait.c (__sigwait): Call __sigtimedwait
and add LIBC_CANCEL_HANDLED for cancellation marking.
* sysdeps/unix/sysv/linux/sigwaitinfo.c (__sigwaitinfo): Likewise.
Signed-off-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
Reviewed-by: Zack Weinberg <zackw@panix.com>
55 lines
2.0 KiB
C
55 lines
2.0 KiB
C
/* Copyright (C) 1997-2017 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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<http://www.gnu.org/licenses/>. */
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#include <errno.h>
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#include <signal.h>
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#include <string.h>
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#include <sysdep-cancel.h>
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int
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__sigtimedwait (const sigset_t *set, siginfo_t *info,
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const struct timespec *timeout)
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{
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sigset_t tmpset;
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if (set != NULL
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&& (__builtin_expect (__sigismember (set, SIGCANCEL), 0)
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|| __builtin_expect (__sigismember (set, SIGSETXID), 0)))
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{
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/* Create a temporary mask without the bit for SIGCANCEL set. */
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// We are not copying more than we have to.
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memcpy (&tmpset, set, _NSIG / 8);
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__sigdelset (&tmpset, SIGCANCEL);
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__sigdelset (&tmpset, SIGSETXID);
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set = &tmpset;
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}
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/* XXX The size argument hopefully will have to be changed to the
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real size of the user-level sigset_t. */
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int result = SYSCALL_CANCEL (rt_sigtimedwait, set, info, timeout, _NSIG / 8);
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/* The kernel generates a SI_TKILL code in si_code in case tkill is
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used. tkill is transparently used in raise(). Since having
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SI_TKILL as a code is useful in general we fold the results
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here. */
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if (result != -1 && info != NULL && info->si_code == SI_TKILL)
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info->si_code = SI_USER;
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return result;
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}
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libc_hidden_def (__sigtimedwait)
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weak_alias (__sigtimedwait, sigtimedwait)
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