Linux--无名管道pipe示例

无名管道pipe用于父子进程之间的通信。

#include <stdio.h>
#include <unistd.h>

int main(void)
{
    int pipe_fd[2];//pipe_fd[1]---pipe头部，读； pipe_fd[0]---pipe尾部，写；
    pid_t pid;
    char buf[1024];
    int ret;
    
    if(pipe(pipe_fd) < 0)
    {
        printf("pipe creat error\n");
        return -1;
    }

    if((pid = fork()) < 0)
        printf("fork error\n");
    else if(pid == 0)//子进程
    {
        printf("\n");
        close(pipe_fd[1]);
        sleep(2);
        if((ret = read(pipe_fd[0], buf, 1024)) > 0)
            printf("child read form pipe is %s\n", buf);
        close(pipe_fd[0]);
        exit(0);
    }
    else if(pid > 0)//父进程
    {
        close(pipe_fd[0]);

        if(write(pipe_fd[1], "Hello", 5) != -1)
            printf("parent writed Hello\n");
        
        if(write(pipe_fd[1], "Pipe", 5) != -1)
            printf("parent writed Pipe\n");
        close(pipe_fd[1]);
    }
    wait(NULL);

    return 0;
}