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/* $OpenBSD: itimer.c,v 1.1 2004/07/28 21:32:51 art Exp $ */
/*
* Written by Artur Grabowski <art@openbsd.org> 2004 Public Domain.
*/
#include <sys/types.h>
#include <sys/time.h>
#include <sys/resource.h>
#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <time.h>
#include <err.h>
#include <signal.h>
void sighand(int);
volatile sig_atomic_t ticks;
#define TIMEOUT 2
int
main(int argc, char **argv)
{
struct timeval stv, tv;
struct itimerval itv;
struct rusage ru;
int which, sig;
int ch;
while ((ch = getopt(argc, argv, "rvp")) != -1) {
switch (ch) {
case 'r':
which = ITIMER_REAL;
sig = SIGALRM;
break;
case 'v':
which = ITIMER_VIRTUAL;
sig = SIGVTALRM;
break;
case 'p':
which = ITIMER_PROF;
sig = SIGPROF;
break;
default:
fprintf(stderr, "Usage: itimer [-rvp]\n");
exit(1);
}
}
signal(sig, sighand);
itv.it_value.tv_sec = 0;
itv.it_value.tv_usec = 100000;
itv.it_interval = itv.it_value;
if (setitimer(which, &itv, NULL) != 0)
err(1, "setitimer");
gettimeofday(&stv, NULL);
while (ticks != TIMEOUT * 10)
;
switch (which) {
case ITIMER_REAL:
gettimeofday(&tv, NULL);
timersub(&tv, &stv, &tv);
break;
case ITIMER_VIRTUAL:
case ITIMER_PROF:
if (getrusage(RUSAGE_SELF, &ru) != 0)
err(1, "getrusage");
tv = ru.ru_utime;
break;
}
stv.tv_sec = TIMEOUT;
stv.tv_usec = 0;
if (timercmp(&stv, &tv, <))
timersub(&tv, &stv, &tv);
else
timersub(&stv, &tv, &tv);
if (tv.tv_sec != 0 || tv.tv_usec > 100000)
errx(1, "timer difference too big: %ld.%ld", (long)tv.tv_sec,
(long)tv.tv_usec);
return (0);
}
void
sighand(int signum)
{
ticks++;
}
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