#include <fcntl.h>
#include <stdio.h>
#include <sys/statfs.h>

int main(int argc, char **argv) {
  int fd = open("/bin/about.elf", O_RDONLY);
  if (fd == -1)
    return 0;
  printf("fd = %d\n", fd);
  struct statfs diskInfo;

  fstatfs(fd, &diskInfo);
  unsigned long long blocksize1 = diskInfo.f_bsize; //每个block里包含的字节数
  unsigned long long totalsize =
      blocksize1 * diskInfo.f_blocks; //总的字节数，f_blocks为block的数目
  printf("Total_size=%llu B =%llu KB =%llu MB = %llu GB\n", totalsize,
         totalsize >> 10, totalsize >> 20, totalsize >> 30);

  /* 2.获取一下剩余空间和可用空间的大小 */
  unsigned long long freeDisk = diskInfo.f_bfree * blocksize1; //剩余空间的大小
  unsigned long long availableDisk =
      diskInfo.f_bavail * blocksize1; //可用空间大小
  printf("Disk_free=%llu MB =%llu GB Disk_available=%llu MB = %llu GB\n",
         freeDisk >> 20, freeDisk >> 30, availableDisk >> 20,
         availableDisk >> 30);

  printf("====================\n");
  printf("diskInfo address: %p\n", diskInfo);
  printf("f_type= %lu\n", diskInfo.f_type);
  printf("f_bsize = %lu\n", diskInfo.f_bsize);
  printf("f_blocks = %d\n", diskInfo.f_blocks);
  printf("f_bfree = %lu\n", diskInfo.f_bfree);
  printf("b_avail = %d\n", diskInfo.f_bavail);
  printf("f_files = %d\n", diskInfo.f_files);
  printf("f_ffree = %lu\n", diskInfo.f_ffree);
  printf("f_fsid = %ld\n", diskInfo.f_fsid);
  printf("f_namelen = %ld\n", diskInfo.f_namelen);
  printf("f_frsize = %ld\n", diskInfo.f_frsize);
  printf("f_flags = %ld\n", diskInfo.f_flags);
  return 0;
}