linux 父子进程同步

#include <stdio.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/wait.h>

int main() {
    int pipe_parent_to_child[2];
    pid_t pid;

    if (pipe(pipe_parent_to_child) == -1) {
        perror("pipe");
        return 1;
    }

    pid = fork();

    if (pid < 0) { // 错误情况
        perror("fork");
        return 1;
    } else if (pid > 0) { // 父进程
        close(pipe_parent_to_child[0]); // 关闭读端
        printf("Parent process: Sending data to child...
");
        write(pipe_parent_to_child[1], "Hello from parent", 18);
        close(pipe_parent_to_child[1]); // 关闭写端
        wait(NULL); // 等待子进程结束
    } else { // 子进程
        close(pipe_parent_to_child[1]); // 关闭写端
        char buffer[100];
        read(pipe_parent_to_child[0], buffer, sizeof(buffer));
        printf("Child process: Received data '%s'
", buffer);
        close(pipe_parent_to_child[0]); // 关闭读端
    }

    return 0;
}