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#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <unistd.h>
#include <stdint.h>
volatile int gotit = 0;
static void
alarm_handler (int signal)
{
gotit = 1;
}
int
main (int argc, char ** argv)
{
clock_t start, stop;
if (signal(SIGALRM, alarm_handler) == SIG_ERR)
{
perror ("signal");
exit (1);
}
alarm(1);
start = clock ();
while (!gotit);
stop = clock ();
printf ("%jd clock ticks per second (start=%jd,stop=%jd)\n",
(intmax_t) (stop - start), (intmax_t) start, (intmax_t) stop);
printf ("CLOCKS_PER_SEC=%jd, sysconf(_SC_CLK_TCK)=%ld\n",
(intmax_t) CLOCKS_PER_SEC, sysconf(_SC_CLK_TCK));
return 0;
}
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