89 lines
1.8 KiB
C
89 lines
1.8 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright (C) 2002 Andi Kleen
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* Copyright (C) 2017 Cyril Hrubis <chrubis@suse.cz>
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*/
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/*
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* DESCRIPTION
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* Check if gettimeofday is monotonous
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*
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* ALGORITHM
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* Call gettimeofday() to get a t1 (fist value)
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* call it again to get t2, see if t2 < t1, set t2 = t1, repeat for 10 sec
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*/
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#include <stdint.h>
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#include <sys/time.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <time.h>
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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 "lapi/syscalls.h"
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static volatile sig_atomic_t done;
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static char *str_rtime;
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static int rtime = 10;
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static void breakout(int sig)
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{
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done = sig;
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}
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static void verify_gettimeofday(void)
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{
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struct __kernel_old_timeval tv1, tv2;
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unsigned long long cnt = 0;
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done = 0;
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alarm(rtime);
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if (tst_syscall(__NR_gettimeofday, &tv1, NULL))
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tst_brk(TFAIL | TERRNO, "gettimeofday() failed");
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while (!done) {
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if (tst_syscall(__NR_gettimeofday, &tv2, NULL))
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tst_brk(TFAIL | TERRNO, "gettimeofday() failed");
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if (tv2.tv_sec < tv1.tv_sec ||
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(tv2.tv_sec == tv1.tv_sec && tv2.tv_usec < tv1.tv_usec)) {
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tst_res(TFAIL,
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"Time is going backwards: old %jd.%jd vs new %jd.%jd!",
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(intmax_t) tv1.tv_sec, (intmax_t) tv1.tv_usec,
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(intmax_t) tv2.tv_sec, (intmax_t) tv2.tv_usec);
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return;
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}
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tv1 = tv2;
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cnt++;
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}
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tst_res(TINFO, "gettimeofday() called %llu times", cnt);
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tst_res(TPASS, "gettimeofday() monotonous in %i seconds", rtime);
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}
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static void setup(void)
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{
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if (str_rtime) {
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rtime = atoi(str_rtime);
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if (rtime <= 0)
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tst_brk(TBROK, "Invalid runtime '%s'", str_rtime);
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tst_set_timeout(rtime + 60);
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}
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SAFE_SIGNAL(SIGALRM, breakout);
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}
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static struct tst_test test = {
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.setup = setup,
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.options = (struct tst_option[]) {
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{"T:", &str_rtime, "-T len Test iteration runtime in seconds"},
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{},
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},
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.test_all = verify_gettimeofday,
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};
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