测算某个文件夹的容量

static int get_statfs(const char path, int64_t total, int64_t *available)
{
struct statfs disk;
if(!path || !total || !available)
return -1;

*total = *available = 0;
if(statfs(path, &disk) !=0) {
    printf("statfs failed:%d\n",errno);
    return -1;
}

*total = (int64_t)disk.f_blocks * disk.f_bsize;
*available = (int64_t)disk.f_bavail * disk.f_bsize;

return 0;

}