#include "apue.h"

 #include <sys/wait.h>

 void sig_int(int signo)

 {

     printf("interrup\r\n");

 }

 int main(void)

 {

     char buf[MAXLINE];

     pid_t pid;

     int status;

     if(signal(SIGINT,sig_int) == SIG_ERR)

         err_sys("signal error");

     printf("%%");

     while(fgets(buf,MAXLINE,stdin) != NULL){

         if(buf[strlen(buf) - ] == '\n')

             buf[strlen(buf) - ] = ;

     if((pid = fork()) < ){

         err_sys("fork error\r\n");

     }else if(pid == ){

         execlp(buf,buf,(char *));

         err_ret("couldn't execute:%s",buf);

         exit();

     }

     if((pid = waitpid(pid,&status,)) < )

         err_sys("waitpid error");

     printf("%% ");

 }

     exit();

     return ;

 }