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Simplify Linux sig{timed}wait{info} implementations

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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>
This commit is contained in:
Adhemerval Zanella
2017-11-01 11:49:05 -02:00
parent a1a638dda9
commit 8b0e795aaa
5 changed files with 21 additions and 118 deletions
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8
sysdeps/unix/sysv/linux/sigtimedwait.c
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@@ -18,12 +18,7 @@
#include <errno.h>
#include <signal.h>
#include <string.h>
#include <nptl/pthreadP.h>
#include <sysdep-cancel.h>
#include <sys/syscall.h>
#ifdef __NR_rt_sigtimedwait
int
__sigtimedwait (const sigset_t *set, siginfo_t *info,
@@ -57,6 +52,3 @@ __sigtimedwait (const sigset_t *set, siginfo_t *info,
}
libc_hidden_def (__sigtimedwait)
weak_alias (__sigtimedwait, sigtimedwait)
#else
# include <signal/sigtimedwait.c>
#endif