linux c语言实现cp

#include <stdio.h>
#include <stdlib.h>
#include <fcntl.h>
#include <unistd.h>
#include <sys/stat.h>

void copy_file(const char *src, const char *dest) {
    int src_fd, dest_fd;
    char buffer[1024];
    ssize_t bytes_read, bytes_written;

    // 打开源文件
    src_fd = open(src, O_RDONLY);
    if (src_fd == -1) {
        perror("Error opening source file");
        return;
    }

    // 创建或打开目标文件
    dest_fd = open(dest, O_WRONLY | O_CREAT | O_TRUNC, S_IRUSR | S_IWUSR);
    if (dest_fd == -1) {
        perror("Error opening destination file");
        close(src_fd);
        return;
    }

    // 读取和写入数据
    while ((bytes_read = read(src_fd, buffer, sizeof(buffer))) > 0) {
        bytes_written = write(dest_fd, buffer, bytes_read);
        if (bytes_written != bytes_read) {
            perror("Error writing to destination file");
            break;
        }
    }

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

    // 关闭文件
    close(src_fd);
    close(dest_fd);
}

int main(int argc, char *argv[]) {
    if (argc != 3) {
        fprintf(stderr, "Usage: %s <source> <destination>\n", argv[0]);
        return 1;
    }

    copy_file(argv[1], argv[2]);
    return 0;
}