1 #define _GNU_SOURCE 2 #include <unistd.h> 3 #include <sys/time.h> 4 ualarm(unsigned value,unsigned interval)5unsigned ualarm(unsigned value, unsigned interval) 6 { 7 struct itimerval it = { 8 .it_interval.tv_usec = interval, 9 .it_value.tv_usec = value 10 }, it_old; 11 setitimer(ITIMER_REAL, &it, &it_old); 12 return it_old.it_value.tv_sec*1000000 + it_old.it_value.tv_usec; 13 } 14