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tst: Add test for sigtimedwait

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This change adds new test to assess sigtimedwait's timeout related
functionality - the sigset_t is configured for SIGUSR1, which will
not be triggered, so sigtimedwait just waits for timeout.

To be more specific - two use cases are checked:
- if sigtimedwait times out immediately when passed struct timespec has
  zero values of tv_nsec and tv_sec.
- if sigtimedwait times out after timeout specified in passed argument

Reviewed-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>
This commit is contained in:
Lukasz Majewski 2021-03-15 12:14:22 +01:00
parent bff3019afc
commit a4ea18ec6c
2 changed files with 63 additions and 1 deletions
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2
sysdeps/unix/sysv/linux/Makefile
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@ -109,7 +109,7 @@ tests += tst-clone tst-clone2 tst-clone3 tst-fanotify tst-personality \
tst-tgkill tst-sysvsem-linux tst-sysvmsg-linux tst-sysvshm-linux \
tst-timerfd tst-ppoll tst-futimens tst-utime tst-utimes \
tst-clock_adjtime tst-adjtimex tst-ntp_adjtime tst-ntp_gettime \
tst-ntp_gettimex
tst-ntp_gettimex tst-sigtimedwait
# Test for the symbol version of fcntl that was replaced in glibc 2.28.
ifeq ($(have-GLIBC_2.27)$(build-shared),yesyes)

62
sysdeps/unix/sysv/linux/tst-sigtimedwait.c Normal file
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@ -0,0 +1,62 @@
/* Test for sigtimedwait timeout.
Copyright (C) 2021 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/>. */
#include <time.h>
#include <errno.h>
#include <signal.h>
#include <support/check.h>
#include <support/xtime.h>
#include <support/timespec.h>
#include <stdbool.h>
static int
test_sigtimedwait_timeout (bool zero_tmo)
{
/* We wait for half a second. */
struct timespec ts;
xclock_gettime (CLOCK_REALTIME, &ts);
struct timespec timeout = make_timespec (0, zero_tmo ? 0 : TIMESPEC_HZ/2);
ts = timespec_add (ts, timeout);
/* Set sigset to just wait for timeout. */
sigset_t ss_usr1;
sigemptyset (&ss_usr1);
sigaddset (&ss_usr1, SIGUSR1);
int ret = sigtimedwait (&ss_usr1, NULL, &timeout);
if (ret != -1)
FAIL_EXIT1 ("sigtimedwait failed: %m\n");
TEST_TIMESPEC_NOW_OR_AFTER (CLOCK_REALTIME, ts);
return 0;
}
static int
do_test (void)
{
/* Check if sigtimedwait exits immediately. */
test_sigtimedwait_timeout (true);
/* Check if sigtimedwait exits after specified timeout. */
test_sigtimedwait_timeout (false);
return 0;
}
#include <support/test-driver.c>