linux c++拷贝文件

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

int main(int argc, char* argv[]) {
    if (argc != 3) {
        std::cerr << "Usage: " << argv[0]<< " <source> <destination>" << std::endl;
        return 1;
    }

    int src_fd = open(argv[1], O_RDONLY);
    if (src_fd == -1) {
        perror("open source file");
        return 1;
    }

    int dest_fd = open(argv[2], O_WRONLY | O_CREAT | O_TRUNC, 0666);
    if (dest_fd == -1) {
        perror("open destination file");
        close(src_fd);
        return 1;
    }

    char buffer[4096];
    ssize_t bytes_read;
    while ((bytes_read = read(src_fd, buffer, sizeof(buffer))) > 0) {
        if (write(dest_fd, buffer, bytes_read) != bytes_read) {
            perror("write to destination file");
            close(src_fd);
            close(dest_fd);
            return 1;
        }
    }

    if (bytes_read == -1) {
        perror("read from source file");
    }

    close(src_fd);
    close(dest_fd);
    return 0;
}

#include <iostream>
#include <fstream>

int main(int argc, char* argv[]) {
    if (argc != 3) {
        std::cerr << "Usage: " << argv[0]<< " <source> <destination>" << std::endl;
        return 1;
    }

    std::ifstream src(argv[1], std::ios::binary);
    if (!src) {
        std::cerr << "Error opening source file" << std::endl;
        return 1;
    }

    std::ofstream dest(argv[2], std::ios::binary);
    if (!dest) {
        std::cerr << "Error opening destination file" << std::endl;
        return 1;
    }

    dest << src.rdbuf();

    if (!src || !dest) {
        std::cerr << "Error copying file" << std::endl;
        return 1;
    }

    return 0;
}