/*
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* Check delay injection.
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*
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* Copyright (c) 2018 The strace developers.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "tests.h"
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#include <limits.h>
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#include <stdio.h>
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#include <stdint.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 <sys/time.h>
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#include <sys/wait.h>
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#include <asm/unistd.h>
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static int64_t
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usecs_from_tv(const struct timeval *const tv)
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{
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return (int64_t) tv->tv_sec * 1000000 + tv->tv_usec;
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}
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static int64_t
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usecs_from_ts(const struct timespec *const ts)
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{
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return (int64_t) ts->tv_sec * 1000000 + ts->tv_nsec / 1000;
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}
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static void
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check_delay(const struct timeval *const tv0,
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const struct timespec *const ts,
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const struct timeval *const tv1,
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const int nproc,
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const int64_t delay_enter,
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const int64_t delay_exit)
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{
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const int64_t us0 = usecs_from_tv(tv0);
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const int64_t us = usecs_from_ts(ts);
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const int64_t us1 = usecs_from_tv(tv1);
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if (us - us0 < delay_exit * (nproc - 1) / nproc)
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_exit(1);
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if (us - us0 > delay_exit * (nproc + 1) / nproc)
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_exit(2);
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if (us1 - us < delay_enter * (nproc - 1) / nproc)
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_exit(3);
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if (us1 - us > delay_enter * (nproc + 1) / nproc)
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_exit(4);
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}
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static void
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run(const int nproc, const int delay_enter, const int delay_exit)
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{
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struct timeval prev = { 0, 0 }, now;
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for (int i = 0; i < nproc; ++i, prev = now) {
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struct timespec ts;
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if (i && clock_gettime(CLOCK_REALTIME, &ts))
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perror_msg_and_fail("clock_gettime");
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if (syscall(__NR_gettimeofday, &now, NULL))
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perror_msg_and_fail("gettimeofday");
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if (!i)
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continue;
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check_delay(&prev, &ts, &now, nproc, delay_enter, delay_exit);
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}
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_exit(0);
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}
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int
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main(int ac, char *av[])
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{
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if (ac != 4)
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error_msg_and_fail("usage: delay <nproc> <delay_enter> <delay_exit>");
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const int nproc = atoi(av[1]);
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if (nproc <= 1)
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perror_msg_and_fail("invalid nproc: %s", av[1]);
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const int delay_enter = atoi(av[2]);
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if (delay_enter <= 0)
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perror_msg_and_fail("invalid delay_enter: %s", av[2]);
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const int delay_exit = atoi(av[3]);
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if (delay_exit <= 0)
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perror_msg_and_fail("invalid delay_exit: %s", av[3]);
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for (int i = 0; i < nproc; ++i) {
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pid_t pid = fork();
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if (pid)
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usleep(MAX(delay_enter, delay_exit) / nproc);
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else
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run(nproc, delay_enter, delay_exit);
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}
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int status;
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while (wait(&status) > 0) {
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if (status)
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perror_msg_and_fail("wait status %d", status);
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}
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return 0;
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}
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