p8-18.c

SUN Solaris8平台下进程间通信

#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include "err_exit.h"
static void sig_alrm(int);
int main(void)
{
    int n=22;
    char line[132];
    if (signal(SIGALRM, sig_alrm) == SIG_ERR)    /* 程序8-5 */
        err_exit("signal(SIGALRM)error");
    alarm(10);
    if (n = read(STDIN_FILENO, line, sizeof(line)) == -1) 
       if (errno == EINTR)
           printf("read error: time out\n");
       else
           err_exit("read error");
    alarm(0);
    write(STDOUT_FILENO, line, sizeof(line));
    exit(EXIT_SUCCESS);
}
static void sig_alrm(int signo)
{
   return;        /* 无动作而返回,起中断读的作用 */