| /* |
| * Copyright (c) International Business Machines Corp., 2001 |
| * 07/2001 Ported by Wayne Boyer |
| * Copyright (C) Cyril Hrubis <chrubis@suse.cz> |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation; either version 2 of the License, or |
| * (at your option) any later version. |
| * |
| * This program 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 General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| */ |
| |
| /* |
| * Test Description: |
| * Verify that nanosleep() will be successful to suspend the execution |
| * of a process, returns after the receipt of a signal and writes the |
| * remaining sleep time into the structure. |
| */ |
| |
| #include <errno.h> |
| #include <unistd.h> |
| #include <fcntl.h> |
| #include <signal.h> |
| #include <time.h> |
| #include <sys/wait.h> |
| #include <sys/time.h> |
| #include <stdint.h> |
| #include <inttypes.h> |
| |
| #include "test.h" |
| |
| char *TCID = "nanosleep02"; |
| int TST_TOTAL = 1; |
| |
| static void do_child(void); |
| static void setup(void); |
| static void sig_handler(); |
| |
| /* |
| * Define here the "rem" precision in microseconds, |
| * Various implementations will provide different |
| * precisions. The -aa tree provides up to usec precision. |
| * NOTE: all the trees that don't provide a precision of |
| * the order of the microseconds are subject to an userspace |
| * live lock condition with glibc under a flood of signals, |
| * the "rem" field would never change without the increased |
| * usec precision in the -aa tree. |
| */ |
| #define USEC_PRECISION 250000 /* Error margin allowed in usec */ |
| |
| int main(int ac, char **av) |
| { |
| int lc; |
| pid_t cpid; |
| |
| tst_parse_opts(ac, av, NULL, NULL); |
| |
| #ifdef UCLINUX |
| maybe_run_child(&do_child, ""); |
| #endif |
| |
| setup(); |
| |
| for (lc = 0; TEST_LOOPING(lc); lc++) { |
| |
| tst_count = 0; |
| |
| if ((cpid = FORK_OR_VFORK()) == -1) { |
| tst_brkm(TBROK, NULL, |
| "fork() failed to create child process"); |
| } |
| |
| if (cpid == 0) { |
| #ifdef UCLINUX |
| if (self_exec(av[0], "")) { |
| tst_brkm(TBROK, NULL, "self_exec failed"); |
| } |
| #else |
| do_child(); |
| #endif |
| } |
| |
| /* wait for child to time slot for execution */ |
| sleep(1); |
| |
| /* Now send signal to child */ |
| if (kill(cpid, SIGINT) < 0) { |
| tst_brkm(TBROK, NULL, |
| "kill() fails send signal to child"); |
| } |
| |
| tst_record_childstatus(NULL, cpid); |
| } |
| |
| tst_exit(); |
| } |
| |
| static void do_child(void) |
| { |
| struct timespec timereq = {.tv_sec = 5, .tv_nsec = 9999}; |
| struct timespec timerem, exp_rem; |
| |
| tst_timer_start(CLOCK_MONOTONIC); |
| TEST(nanosleep(&timereq, &timerem)); |
| tst_timer_stop(); |
| |
| if (tst_timespec_lt(timereq, tst_timer_elapsed())) { |
| tst_resm(TFAIL, "nanosleep() slept more than timereq"); |
| return; |
| } |
| |
| exp_rem = tst_timespec_diff(timereq, tst_timer_elapsed()); |
| |
| if (tst_timespec_abs_diff_us(timerem, exp_rem) > USEC_PRECISION) { |
| tst_resm(TFAIL, |
| "nanosleep() remaining time %llius, expected %llius, diff %llius", |
| tst_timespec_to_us(timerem), tst_timespec_to_us(exp_rem), |
| tst_timespec_abs_diff_us(timerem, exp_rem)); |
| } else { |
| tst_resm(TPASS, |
| "nanosleep() slept for %llius, remaining time difference %llius", |
| tst_timer_elapsed_us(), |
| tst_timespec_abs_diff_us(timerem, exp_rem)); |
| } |
| |
| tst_exit(); |
| } |
| |
| static void setup(void) |
| { |
| tst_sig(FORK, DEF_HANDLER, NULL); |
| |
| tst_timer_check(CLOCK_MONOTONIC); |
| |
| TEST_PAUSE; |
| |
| if (signal(SIGINT, sig_handler) == SIG_ERR) { |
| tst_brkm(TBROK, NULL, |
| "signal() fails to setup signal handler"); |
| } |
| } |
| |
| static void sig_handler(void) |
| { |
| } |