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#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>

void get_cal(const char *arg)
{
    char cmd[64];
    strcpy(cmd, arg);
 
    int pfds[2],bak_stdout;
    if(pipe(pfds)==0)
  { 
     
    printf("2\n");
    printf("fd_11 is %d\n",pfds[1]);     
    printf("2.1\n");
    bak_stdout=dup(1);
    printf("2.1.1\n");
    // close(1);
    printf("2.1.1.1\n");
      dup2( pfds[1], 1);     
      close(pfds[0]); 
      printf("1.2\n");
      system(cmd);
      close(pfds[1]);
      dup2(bak_stdout,1);
   

  else
    printf("pipe open error!\n");


void read_cal(char *data)
{
    char cmd[64], line[199]; 
    *data = 0;
    int pfds[2];
    if(pipe(pfds)==0)


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