如何检查文件系统是否已使用C/C++挂载

#include <sys/statvfs.h>
#include <stdio.h>

int main() {
    struct statvfs fs_info;
    const char* mount_point = "/path/to/mount/point";

    if (statvfs(mount_point, &fs_info) == 0) {
        printf("File system is mounted.\n");
    } else {
        printf("File system is not mounted.\n");
    }

    return 0;
}

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

int is_mounted(const char* mount_point) {
    FILE* fp;
    char line[256];
    char* token;

    fp = popen("mount", "r");
    if (fp == NULL) {
        return -1;
    }

    while (fgets(line, sizeof(line), fp) != NULL) {
        token = strtok(line, " ");
        if (token != NULL && strcmp(token, mount_point) == 0) {
            pclose(fp);
            return 1;
        }
    }

    pclose(fp);
    return 0;
}

int main() {
    const char* mount_point = "/path/to/mount/point";

    if (is_mounted(mount_point)) {
        printf("File system is mounted.\n");
    } else {
        printf("File system is not mounted.\n");
    }

    return 0;
}