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#include <errno.h>
#include <limits.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
void
sig_handler(int sig) {
(void)sig;
exit(0);
}
int
main(int argc, char **argv) {
if (argc != 2) {
fprintf(stderr, "usage: %s time\n", *argv);
return 1;
}
signal(SIGALRM, sig_handler);
errno = 0;
unsigned long t = strtoul(argv[1], NULL, 10);
if (errno || t == ULONG_MAX)
return 1;
while (t > 0)
t = sleep(t);
return 0;
}
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