C中的多管道bash风格

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

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

    if (pipe(pipefd) == -1) {
        perror("pipe");
        exit(EXIT_FAILURE);
    }

    pid = fork();

    if (pid == -1) {
        perror("fork");
        exit(EXIT_FAILURE);
    }

    if (pid == 0) {
        // Child process
        close(pipefd[1]); // Close write end of pipe
        dup2(pipefd[0], STDIN_FILENO); // Redirect stdin to read end of pipe
        close(pipefd[0]); // Close read end of pipe
        execlp("sort", "sort", NULL); // Execute sort command
        perror("execlp");
        exit(EXIT_FAILURE);
    } else {
        // Parent process
        close(pipefd[0]); // Close read end of pipe
        dup2(pipefd[1], STDOUT_FILENO); // Redirect stdout to write end of pipe
        close(pipefd[1]); // Close write end of pipe
        execlp("ls", "ls", NULL); // Execute ls command
        perror("execlp");
        exit(EXIT_FAILURE);
    }

    return 0;
}