#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>

static void sig_alrm(int);
#define MAXLINE 4096

int main(void)
{
	int n;
	char line[MAXLINE];
	/*設定超時時限*/
	alarm(10);
	/*信號注冊函數*/
	if(signal(SIGALRM, sig_alrm) == SIG_ERR)
		perror("signal");
	if((n = read(STDIN_FILENO, line, MAXLINE)) < 0)
		perror("read");
	alarm(0);
	
	write(STDOUT_FILENO, line, n);
	exit(0);
}

static void sig_alrm(int signo)
{
	printf("in here alarm\n");
}