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tst: Provide test for ppoll

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This change adds new test to assess ppoll()'s timeout related
functionality (the struct pollfd does not provide valid fd to wait
for - just wait for timeout).

To be more specific - two use cases are checked:
- if ppoll() times out immediately when passed struct timespec has zero
values of tv_nsec and tv_sec.
- if ppoll() times out after timeout specified in passed argument
This commit is contained in:
Lukasz Majewski 2021-01-13 17:10:21 +01:00
parent 5692abd13d
commit e2c0794d13
2 changed files with 57 additions and 1 deletions
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2
sysdeps/unix/sysv/linux/Makefile
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@ -107,7 +107,7 @@ tests += tst-clone tst-clone2 tst-clone3 tst-fanotify tst-personality \
test-errno-linux tst-memfd_create tst-mlock2 tst-pkey \
tst-rlimit-infinity tst-ofdlocks tst-gettid tst-gettid-kill \
tst-tgkill tst-sysvsem-linux tst-sysvmsg-linux tst-sysvshm-linux \
tst-timerfd
tst-timerfd tst-ppoll
tests-internal += tst-ofdlocks-compat tst-sigcontext-get_pc
CFLAGS-tst-sigcontext-get_pc.c = -fasynchronous-unwind-tables

56
sysdeps/unix/sysv/linux/tst-ppoll.c Normal file
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@ -0,0 +1,56 @@
/* Test for ppoll 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 <poll.h>
#include <errno.h>
#include <support/check.h>
#include <support/xtime.h>
#include <support/timespec.h>
#include <stdbool.h>
static int test_ppoll_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);
/* Ignore fds - just wait for timeout. */
struct pollfd fds = { -1, 0, 0 };
TEST_COMPARE (ppoll (&fds, 1, &timeout, 0), 0);
TEST_TIMESPEC_NOW_OR_AFTER (CLOCK_REALTIME, ts);
return 0;
}
static int
do_test (void)
{
/* Check if ppoll exits immediately. */
test_ppoll_timeout (true);
/* Check if ppoll exits after specified timeout. */
test_ppoll_timeout (false);
return 0;
}
#include <support/test-driver.c>