timeTest2.c

#include <sys/time.h>
#include <stdio.h>
#include <unistd.h>
#include <signal.h>
#include <string.h>
#include <stdlib.h>

#define PROMPT "时间已经过去了两秒钟\n\a"

char * prompt = PROMPT;
unsigned int len;
void prompt_info(int signo) {
	write(STDERR_FILENO,prompt,len);
}

void init_sigaction(void) {
	struct sigaction act;
	act.sa_handler = prompt_info;
	act.sa_flags = 0;
	sigemptyset(&act.sa_mask);
	sigaction(SIGPROF,&act,NULL);
}

void init_time() {
	struct itimerval value;
	value.it_value.tv_sec = 2;
	value.it_value.tv_usec = 0;
	value.it_interval = value.it_value;
	setitimer(ITIMER_PROF,&value,NULL);
}

int main() {
	len = strlen(prompt);
	init_sigaction();
	init_time();
	while(1);
	exit(0);
}