在c++中处理管道时关闭文件描述符

#include <unistd.h>
#include <iostream>

int main() {
    int pipefd[2];
    if (pipe(pipefd) == -1) {
        std::cerr << "Failed to create pipe" << std::endl;
        return 1;
    }

    pid_t pid = fork();
    if (pid == -1) {
        std::cerr << "Failed to create child process" << std::endl;
        return 1;
    } else if (pid == 0) {
        // Child process
        close(pipefd[0]); // Close the read end of the pipe
        // Write data to the pipe
        const char* message = "Hello from child process";
        write(pipefd[1], message, strlen(message));
        close(pipefd[1]); // Close the write end of the pipe
    } else {
        // Parent process
        close(pipefd[1]); // Close the write end of the pipe
        // Read data from the pipe
        char buffer[100];
        ssize_t bytesRead = read(pipefd[0], buffer, sizeof(buffer));
        if (bytesRead > 0) {
            buffer[bytesRead] = '\0';
            std::cout << "Received message from child process: " << buffer << std::endl;
        }
        close(pipefd[0]); // Close the read end of the pipe
    }

    return 0;
}