double_pipe.c

这是一个linux下的双管道

//这个程序是创建一个双管道
#include<stdio.h>
#include<stdlib.h>
#include<string.h>
#include<unistd.h>
#include<errno.h>
#include<sys/types.h>
#include<sys/wait.h>

int main(int argc,char **argv)
{
    int pip[2];
    char wbuf[100];
    char rbuf[100];
    pid_t pid;
    int pi;
    memset(rbuf,0,sizeof(rbuf));
    pi=pipe(pip);
    if(-1 == pi)
     {
         printf("pipe error\n");
         exit(0);
     }
    pid=fork();
    if(-1 == pid)
     {
        printf("fork error\n ");
        exit(0);
     }
    if(0 == pid)//第一个读，
     {
        close(pip[1]);
        read(pip[0],rbuf,100);
        printf("the child Read rbuf is = %s\n",rbuf);
        close(pip[0]);
        exit(0);
     }
    else//第二个写
    {
       close(pip[0]);
       sprintf(wbuf,"I am a student \n");
       write(pip[1],wbuf,100);
       printf("the father write wbuf is = %s",wbuf);
       wait(&pip[0]);
       close(pip[1]);
       
    }
   exit(0);
   
   
   
   
}