Linux,实时获取磁盘空间

#include <iostream>
#include <stdlib.h>
#include <stdio.h>
#include <sys/statfs.h>
#include <string>

using std::cout;
using std::endl;
using std::string;

int main()
{
    FILE *pFile = fopen("test", "rw");
    string strPath("/root");

    fclose(pFile);
    struct statfs tagStatfs;
    statfs(strPath.c_str(), &tagStatfs);

    while(1) {
        statfs(strPath.c_str(), &tagStatfs);
        cout<<"tagStatfs.f_bfree = "<<tagStatfs.f_bfree<<endl;
        sleep(1);
    }

    return 0;
}