使用信号捕抓ctrl + c信号

/* * 1.10ReadCommandsFromStandardInputAndExecuteThem.cpp * *  Created on: Feb 11, 2015 *      Author: sunyj */#include "../apuesunyj.h"#include 
    
     static void sig_int(int); // our signal-catching function,static limit this function in this fileint main(void){    char buf[MAXLINE];    pid_t pid;    int status;    if (signal(SIGINT, sig_int) == SIG_ERR) // catch the ctrl + c signal    {        err_sys("signal error");    }    printf("%% "); /* print prompt (printf requires %% to print %) */    // ctrl + c invoke function sig_int, ctrl + d end this loop    while (fgets(buf, MAXLINE, stdin) != NULL)    {        if (buf[strlen(buf) - 1] == '\n')        {            buf[strlen(buf) - 1] = 0; /* replace newline with null */        }        if ((pid = fork()) < 0)        {            err_sys("fork error");        }        else if (pid == 0)        {   /* child */            execlp(buf, buf, (char *) 0);            err_ret("couldn't execute: %s", buf);            exit(127);        }        /* parent */        if ((pid = waitpid(pid, &status, 0)) < 0)            err_sys("waitpid error");        printf("%% ");    }    printf("EOF(ctrl + d) received\n");    printf("bye bye\n");    exit(0);}void sig_int(int signo){    printf("interrupt by signal ctrl + c \n%% ");}