108 lines
2.6 KiB
C
108 lines
2.6 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright (c) International Business Machines Corp., 2001
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* 07/2001 Ported by Wayne Boyer
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* Copyright (C) Cyril Hrubis <chrubis@suse.cz>
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*/
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/*
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* Test Description:
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* Verify that nanosleep() will be successful to suspend the execution
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* of a process, returns after the receipt of a signal and writes the
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* remaining sleep time into the structure.
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*
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* This test also verifies that if the call is interrupted by a signal
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* handler, nanosleep() returns -1, sets errno to EINTR.
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*/
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#include <errno.h>
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#include "tst_test.h"
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#include "tst_timer.h"
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#include "tst_safe_macros.h"
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/*
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* Define here the "rem" precision in microseconds,
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* Various implementations will provide different
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* precisions. The -aa tree provides up to usec precision.
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* NOTE: all the trees that don't provide a precision of
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* the order of the microseconds are subject to an userspace
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* live lock condition with glibc under a flood of signals,
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* the "rem" field would never change without the increased
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* usec precision in the -aa tree.
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*/
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#define USEC_PRECISION 250000 /* Error margin allowed in usec */
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static void do_child(void)
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{
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struct timespec timereq = {.tv_sec = 5, .tv_nsec = 9999};
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struct timespec timerem, exp_rem;
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tst_timer_start(CLOCK_MONOTONIC);
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TEST(nanosleep(&timereq, &timerem));
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tst_timer_stop();
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if (TST_RET != -1) {
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tst_res(TFAIL,
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"nanosleep was not interrupted, returned %ld, expected -1",
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TST_RET);
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return;
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}
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if (TST_ERR != EINTR) {
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tst_res(TFAIL | TTERRNO,
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"nanosleep() failed, expected EINTR, got");
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return;
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}
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tst_res(TPASS, "nanosleep() returned -1, set errno to EINTR");
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if (tst_timespec_lt(timereq, tst_timer_elapsed()))
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tst_brk(TFAIL, "nanosleep() slept more than timereq");
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exp_rem = tst_timespec_diff(timereq, tst_timer_elapsed());
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if (tst_timespec_abs_diff_us(timerem, exp_rem) > USEC_PRECISION) {
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tst_res(TFAIL,
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"nanosleep() remaining time %llius, expected %llius, diff %llius",
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tst_timespec_to_us(timerem), tst_timespec_to_us(exp_rem),
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tst_timespec_abs_diff_us(timerem, exp_rem));
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} else {
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tst_res(TPASS,
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"nanosleep() slept for %llius, remaining time difference %llius",
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tst_timer_elapsed_us(),
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tst_timespec_abs_diff_us(timerem, exp_rem));
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}
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}
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void run(void)
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{
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pid_t cpid;
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cpid = SAFE_FORK();
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if (cpid == 0) {
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do_child();
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} else {
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sleep(1);
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SAFE_KILL(cpid, SIGINT);
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tst_reap_children();
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}
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}
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static void sig_handler(int si LTP_ATTRIBUTE_UNUSED)
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{
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}
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static void setup(void)
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{
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tst_timer_check(CLOCK_MONOTONIC);
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SAFE_SIGNAL(SIGINT, sig_handler);
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}
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static struct tst_test test = {
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.forks_child = 1,
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.setup = setup,
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.test_all = run,
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};
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