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#include <unistd.h>
#include <sys/types.h>
#include <stdio.h>
#include <errno.h>
#include <stdlib.h>
 
int main()
{
       int pipe_fd[2];
       pid_t pid;
       char buf_r[100];
       char *p_wbuf;
       int r_num;
 
       memset(buf_r, 0, sizeof(buf_r));
       if(pipe(pipe_fd) < 0)
       {
              printf("pipe create error!\n");
              return -1;
       }
 
       if((pid = fork()) == 0)
       {
              printf("\n");
              close(pipe_fd[1]);
              sleep(2);
              if((r_num = read(pipe_fd[0], buf_r, 100)) > 0)
              {
                     printf("%d numbers read from the pipe is %s\n", r_num, buf_r);
              }
              close(pipe_fd[0]);
              exit(0);
       }