#include <signal.h>#include "sig.h"void sig_alarmblock() { sig_block(SIGALRM); }void sig_alarmunblock() { sig_unblock(SIGALRM); }void sig_alarmcatch(f) void (*f)(); { sig_catch(SIGALRM,f); }void sig_alarmdefault() { sig_catch(SIGALRM,SIG_DFL); }