C语言fork两个子进程并读取父进程写入管道中的信息

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

int main() {
    int fd[2];
    pid_t pid1, pid2;

    if (pipe(fd) == -1) {
        printf("Pipe failed\n");
        return 1;
    }

    pid1 = fork();
    if (pid1 < 0) {
        printf("Fork 1 failed\n");
        return 1;
    } else if (pid1 == 0) { // 子进程1
        close(fd[1]);
        char buffer[100];
        int n = read(fd[0], buffer, sizeof(buffer));
        if (n > 0) {
            buffer[n] = '\0';
            printf("Child process 1 received message: %s", buffer);
        }
        close(fd[0]);
        exit(0);
    } else { // 父进程
        pid2 = fork();
        if (pid2 < 0) {
            printf("Fork 2 failed\n");
            return 1;
        } else if (pid2 == 0) { // 子进程2
            close(fd[1]);
            char buffer[100];
            int n = read(fd[0], buffer, sizeof(buffer));
            if (n > 0) {
                buffer[n] = '\0';
                printf("Child process 2 received message: %s", buffer);
            }
            close(fd[0]);
            exit(0);
        } else { // 父进程
            close(fd[0]);
            char message[] = "Hello, child processes!\n";
            int n = write(fd[1], message, strlen(message));
            if (n == -1) {
                printf("Write to pipe failed\n");
            }
            close(fd[1]);

            wait(NULL);
            wait(NULL);
        }
    }

    return 0;
}