1.程序

#include <stdio.h>
#include <sys/statvfs.h>
#include <errno.h>int main(int argc, char *argv[]) {const char *path;struct statvfs fs_info;// 检查参数if (argc != 2) {fprintf(stderr, "用法: %s <挂载点或路径>\n", argv[0]);fprintf(stderr, "示例: %s /\n", argv[0]);return 1;}path = argv[1];// 获取文件系统信息if (statvfs(path, &fs_info)){perror("statvfs 失败");return errno;}// 打印超级块信息printf("\n文件系统超级块信息 (%s):\n", path);printf("===============================\n");printf("文件系统块大小:        %lu 字节\n", fs_info.f_bsize);printf("片段大小:              %lu 字节\n", fs_info.f_frsize);printf("总块数:               %lu\n", fs_info.f_blocks);printf("空闲块数:             %lu\n", fs_info.f_bfree);printf("可用块数:             %lu\n", fs_info.f_bavail);printf("总 inode 数:          %lu\n", fs_info.f_files);printf("空闲 inode 数:        %lu\n", fs_info.f_ffree);printf("可用 inode 数:        %lu\n", fs_info.f_favail);printf("文件系统 ID:          %lu\n", fs_info.f_fsid);printf("挂载标志:             0x%lx\n", fs_info.f_flag);printf("文件名最大长度:       %lu\n", fs_info.f_namemax);printf("===============================\n");// 计算空间使用情况unsigned long total_size = fs_info.f_blocks * fs_info.f_frsize;unsigned long free_size = fs_info.f_bfree * fs_info.f_frsize;unsigned long avail_size = fs_info.f_bavail * fs_info.f_frsize;double used_percent = 100.0 * (1.0 - (double)fs_info.f_bavail / (fs_info.f_blocks - fs_info.f_bfree + fs_info.f_bavail));printf("\n空间使用情况:\n");printf("总空间:    %.2f GB\n", total_size / (1024.0 * 1024 * 1024));printf("空闲空间:  %.2f GB\n", free_size / (1024.0 * 1024 * 1024));printf("可用空间:  %.2f GB\n", avail_size / (1024.0 * 1024 * 1024));printf("已用空间:  %.1f%%\n", used_percent);return 0;
}

2.运行结果