[PATCH] tst: Add test for sigtimedwait

[Adhemerval Zanella]

On 15/03/2021 08:42, Lukasz Majewski wrote:
> 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

LGTM with the small nit below.

Reviewed-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>

> ---
>   sysdeps/unix/sysv/linux/Makefile           |  5 +-
>   sysdeps/unix/sysv/linux/tst-sigtimedwait.c | 61 ++++++++++++++++++++++
>   2 files changed, 64 insertions(+), 2 deletions(-)
>   create mode 100644 sysdeps/unix/sysv/linux/tst-sigtimedwait.c
> 
> diff --git a/sysdeps/unix/sysv/linux/Makefile b/sysdeps/unix/sysv/linux/Makefile
> index 41798feb35..a3eba0db01 100644
> --- a/sysdeps/unix/sysv/linux/Makefile
> +++ b/sysdeps/unix/sysv/linux/Makefile
> @@ -113,8 +113,9 @@ 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-futimes \
> -	 tst-lutimes tst-ntp_gettime tst-ntp_gettimex tst-getrusage
> -
> +	 tst-lutimes tst-ntp_gettime tst-ntp_gettimex tst-getrusage \
> +	 tst-sigtimedwait
> +	
>   # Test for the symbol version of fcntl that was replaced in glibc 2.28.
>   ifeq ($(have-GLIBC_2.27)$(build-shared),yesyes)
>   tests += tst-ofdlocks-compat

Ok.

> diff --git a/sysdeps/unix/sysv/linux/tst-sigtimedwait.c b/sysdeps/unix/sysv/linux/tst-sigtimedwait.c
> new file mode 100644
> index 0000000000..95a1b59592
> --- /dev/null
> +++ b/sysdeps/unix/sysv/linux/tst-sigtimedwait.c
> @@ -0,0 +1,61 @@
> +/* 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)

Put the function name on the next line.

> +{
> +  /* 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;
> +}
> +

Ok.

> +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>
> 

Ok.