glibc/time/tst-clock_nanosleep.c
Adhemerval Zanella 6d97330d7a linux: Only use 64-bit syscall if required for clock_nanosleep
For !__ASSUME_TIME64_SYSCALLS there is no need to issue a 64-bit syscall
if the provided timeout fits in a 32-bit one.  The 64-bit usage should
be rare since the timeout is a relative one.

Checked on i686-linux-gnu on a 4.15 kernel and on a 5.11 kernel
(with and without --enable-kernel=5.1) and on x86_64-linux-gnu.

Reviewed-by: Lukasz Majewski <lukma@denx.de>
2021-06-22 12:09:52 -03:00

68 lines
1.8 KiB
C

/* Copyright (C) 2003-2021 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 <errno.h>
#include <stdio.h>
#include <unistd.h>
#include <sys/time.h>
#include <time.h>
#include <intprops.h>
#include <support/support.h>
#include <support/check.h>
/* Test that clock_nanosleep() does sleep. */
static void
clock_nanosleep_test (void)
{
/* Current time. */
struct timeval tv1;
gettimeofday (&tv1, NULL);
struct timespec ts = { 1, 0 };
TEMP_FAILURE_RETRY (clock_nanosleep (CLOCK_REALTIME, 0, &ts, &ts));
/* At least one second must have passed. */
struct timeval tv2;
gettimeofday (&tv2, NULL);
tv2.tv_sec -= tv1.tv_sec;
tv2.tv_usec -= tv1.tv_usec;
if (tv2.tv_usec < 0)
--tv2.tv_sec;
TEST_VERIFY (tv2.tv_sec >= 1);
}
static void
clock_nanosleep_large_timeout (void)
{
support_create_timer (0, 100000000, false, NULL);
struct timespec ts = { TYPE_MAXIMUM (time_t), 0 };
int r = clock_nanosleep (CLOCK_REALTIME, 0, &ts, NULL);
TEST_VERIFY (r == EINTR || r == EOVERFLOW);
}
static int
do_test (void)
{
clock_nanosleep_test ();
clock_nanosleep_large_timeout ();
return 0;
}
#include <support/test-driver.c>