1 #include <unistd.h>
2 #include <sys/time.h>
3 #include "syscall.h"
4 
alarm(unsigned seconds)5 unsigned alarm(unsigned seconds)
6 {
7 	struct itimerval it = { .it_value.tv_sec = seconds };
8 	__syscall(SYS_setitimer, ITIMER_REAL, &it, &it);
9 	return it.it_value.tv_sec + !!it.it_value.tv_usec;
10 }
11