ipc_pipe.c

/*************************************************************************
    > File Name: ipc_pipe.c
    > Author: VOID_133
    > IPC(InterProcess Communication) Use Pipe
    > Mail: ################### 
    > Created Time: Tue 10 May 2016 06:51:27 PM CST
 ************************************************************************/
#include<stdio.h>
#include<stdlib.h>
#include<string.h>
#include<unistd.h>
#include<sys/file.h>
#include<sys/wait.h>

char buf_1[] = "Hi, parent, I am your child";
char buf_2[] = "Hi, child, I am your parent";
char recvbuf[1000];

int main()
{
    int pipe_fd[2];

    if(pipe(pipe_fd) < 0)
        perror("Create pipe error");
    printf("Create pipe from [read]%d [write]%d\n", pipe_fd[0], pipe_fd[1]);
    pid_t fpid = getpid();
    pid_t id = fork();
    if(id < 0)
        perror("create child fail");
    if(id == 0)
    {
        /* First Child Send Data to Father */
        //close(pipe_fd[0]);
        sleep(1);
        if(write(pipe_fd[1], buf_1, strlen(buf_1) * sizeof(char)) < 0)
            perror("child write error");
        sleep(1);
        memset(recvbuf, 0, sizeof(recvbuf));
        if(read(pipe_fd[0], recvbuf, strlen(buf_2) * sizeof(char) < 0))
            perror("child read error");
        else
            printf("Recv From Parent[%d]: %s\n", fpid, recvbuf);

    }
    else
    {
        /* First Child Send Data to Father */
        //close(pipe_fd[1]);
        sleep(1);
        memset(recvbuf, 0, sizeof(recvbuf));
        if(read(pipe_fd[0], recvbuf, strlen(buf_1) * sizeof(char)) < 0)
            perror("parent read error");
        printf("Recv from Child[%d]: %s\n", id, recvbuf);
        //sleep(1);
        fflush(NULL);
        if(write(pipe_fd[1], buf_2, strlen(buf_2) * sizeof(char)) < 0)
            perror("parent write error");
        else
            printf("Parent Write OK\n");
        sleep(1);
    }
    return 0;
}