suite/tests/client-interface/timer.c

/* **********************************************************
 * Copyright (c) 2012 Google, Inc.  All rights reserved.
 * Copyright (c) 2010 VMware, Inc.  All rights reserved.
 * **********************************************************/

/*
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * * Redistributions of source code must retain the above copyright notice,
 *   this list of conditions and the following disclaimer.
 *
 * * Redistributions in binary form must reproduce the above copyright notice,
 *   this list of conditions and the following disclaimer in the documentation
 *   and/or other materials provided with the distribution.
 *
 * * Neither the name of VMware, Inc. nor the names of its contributors may be
 *   used to endorse or promote products derived from this software without
 *   specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL VMWARE, INC. OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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 * DAMAGE.
 */

#include "tools.h"
#include <assert.h>
#include <stdio.h>
#include <unistd.h>
#include <signal.h>
#include <ucontext.h>
#include <sys/time.h> /* itimer */
#include <time.h>     /* for nanosleep */

/* test PR 204556: support DR+client itimers in presence of app itimers
 * and  i#283/PR 368737: add client timer support
 */

static void
signal_handler(int sig, siginfo_t *siginfo, ucontext_t *ucxt)
{
    if (sig == SIGALRM)
        print("app got SIGALRM\n");
    else
        assert(0);
}

int
main(int argc, char *argv[])
{
    int rc;
    struct itimerval t;
    intercept_signal(SIGALRM, signal_handler, false);
    t.it_interval.tv_sec = 0;
    t.it_interval.tv_usec = 10000;
    t.it_value.tv_sec = 0;
    t.it_value.tv_usec = 10000;
    rc = setitimer(ITIMER_REAL, &t, NULL);
    assert(rc == 0);

    struct timespec sleeptime;
    sleeptime.tv_sec = 0;
    sleeptime.tv_nsec = 25*1000*1000; /* 25ms */
    /* Doing a few more syscalls makes the test more reliable than one long
     * sleep, since we hit dispatch more often.
     */
    nanosleep(&sleeptime, NULL);
    nanosleep(&sleeptime, NULL);
    nanosleep(&sleeptime, NULL);

    return 0;
}