int
main(int argc, char *argv[])
{
struct itimerval itv;
clock_t prevClock;
int maxSigs; /* Number of signals to catch before exiting */
int sigCnt; /* Number of signals so far caught */
struct sigaction sa;
if (argc > 1 && strcmp(argv[1], "--help") == 0)
usageErr("%s [secs [usecs [int-secs [int-usecs]]]]\n", argv[0]);
sigCnt = 0;
sigemptyset(&sa.sa_mask);
sa.sa_flags = 0;
sa.sa_handler = sigalrmHandler;
if (sigaction(SIGALRM, &sa, NULL) == -1)
errExit("sigaction");
/* Set timer from the command-line arguments */
itv.it_value.tv_sec = (argc > 1) ? getLong(argv[1], 0, "secs") : 2;
itv.it_value.tv_usec = (argc > 2) ? getLong(argv[2], 0, "usecs") : 0;
itv.it_interval.tv_sec = (argc > 3) ? getLong(argv[3], 0, "int-secs") : 0;
itv.it_interval.tv_usec = (argc > 4) ? getLong(argv[4], 0, "int-usecs") : 0;
/* Exit after 3 signals, or on first signal if interval is 0 */
maxSigs = (itv.it_interval.tv_sec == 0 &&
itv.it_interval.tv_usec == 0) ? 1 : 3;
displayTimes("START:", FALSE);
if (setitimer(ITIMER_REAL, &itv, NULL) == -1)
errExit("setitimer");
prevClock = clock();
sigCnt = 0;
for (;;) {
/* Inner loop consumes at least 0.5 seconds CPU time */
while (((clock() - prevClock) * 10 / CLOCKS_PER_SEC) < 5) {
if (gotAlarm) { /* Did we get a signal? */
gotAlarm = 0;
displayTimes("ALARM:", TRUE);
sigCnt++;
if (sigCnt >= maxSigs) {
printf("That's all folks\n");
exit(EXIT_SUCCESS);
}
}
}
prevClock = clock();
displayTimes("Main: ", TRUE);
}
}
int main()
{
displayTimes(24.4833, 54.35, "Abu Dhabi", 3, 9, 2014, 4, 0, 7);
printf("Verified times for Abu Dhabi on 3/ 9/2014\n4:38:32 6:03:14 12:20:52 15:49:22 18:38:09 20:08:09\n");
displayTimes(51.500152, -0.126236, "London", 1, 1, 2014, 0, 0, 10);
printf("Verified times for London on 1/ 1/2014\n6:24:53 8:04:53 12:07:53 13:44:04 16:04:05 17:38:05\n");
displayTimes(24.671978, 46.675415, "Riyadh", 3, 9, 2014, 3, 0, 6);
printf("Verified times for Riyadh on 3/ 9/2014\n4:15:56 5:33:49 11:51:34 15:20:16 18:08:57 19:38:57\n");
return 0;
}
