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學(xué)習(xí)啦 > 學(xué)習(xí)電腦 > 操作系統(tǒng) > Linux教程 > linux獲取文件系統(tǒng)信息的腳本代碼

linux獲取文件系統(tǒng)信息的腳本代碼

時(shí)間: 恒輝636 分享

linux獲取文件系統(tǒng)信息的腳本代碼

  源碼如下:

  #include

  #include

  #include

  #include

  //文件系統(tǒng)信息結(jié)構(gòu)體

  struct fileSystem_info{

  char fileSystem_format[8];

  char fileSystem_total_capacity[11];

  char fileSystem_free_capacity[11];

  char fileSystem_permissions[3];

  };

  /*獲取文件系統(tǒng)信息*/

  int get_fileSystem_info(const char *fileSystem_name, struct fileSystem_info *fi);

  /*block to kbyte*/

  static unsigned long kscale(unsigned long m_block, unsigned long m_kbyte);

  /*convert size to GB MB KB*/

  static char *convert_size(float m_size, char *dest);

  int main()

  {

  char buf[1024];

  struct fileSystem_info fileSysInfo;

  get_fileSystem_info("/",&fileSysInfo);

  printf("%s\n",fileSysInfo.fileSystem_format);

  printf("%s\n",fileSysInfo.fileSystem_free_capacity);

  printf("%s\n",fileSysInfo.fileSystem_total_capacity);

  printf("%s\n",fileSysInfo.fileSystem_permissions);

  return 0;

  }

  /*獲取文件系統(tǒng)信息*/

  int get_fileSystem_info(const char *fileSystem_name,struct fileSystem_info *fi)

  {

  struct statfs buf;

  float fileSystem_total_size = 0;

  float fileSystem_free_size = 0;

  if(statfs(fileSystem_name,&buf))

  {

  fprintf(stderr,"statfs %s\n",strerror(errno));

  return -1;

  }

  switch(buf.f_type)

  {

  case 0xEF51:

  case 0xEF53:

  sprintf(fi->fileSystem_format,"EXT");

  break;

  case 0x4d44:

  sprintf(fi->fileSystem_format,"FAT");

  break;

  case 0x5346544e:

  sprintf(fi->fileSystem_format,"NIFS");

  break;

  default:

  sprintf(fi->fileSystem_format,"unknown");

  break;

  }

  bzero(&fi->fileSystem_total_capacity,sizeof(fi->fileSystem_total_capacity));

  bzero(&fi->fileSystem_free_capacity,sizeof(fi->fileSystem_free_capacity));

  printf("blocks %ld\n",buf.f_blocks);

  printf("bfree %ld\n",buf.f_bfree);

  printf("bsize %ld\n",buf.f_bsize);

  fileSystem_total_size =

  (float)(kscale(buf.f_blocks, buf.f_bsize));

  fileSystem_free_size =

  (float)(kscale(buf.f_bfree, buf.f_bsize));

  printf("total %f\n",fileSystem_total_size);

  printf("free %f\n",fileSystem_free_size);

  convert_size(fileSystem_total_size,fi->fileSystem_total_capacity);

  convert_size(fileSystem_free_size,fi->fileSystem_free_capacity);

  bzero(fi->fileSystem_permissions,sizeof(fi->fileSystem_permissions));

  sprintf(fi->fileSystem_permissions,"rw");

  return 0;

  }

  /*block to kbyte*/

  static unsigned long kscale(unsigned long m_block, unsigned long m_kbyte)

  {

  return ((unsigned long long) m_block * m_kbyte + 1024 / 2 ) /1024;

  }

  /*convert size to GB MB KB*/

  static char *convert_size(float m_size, char *dest)

  {

  if((((m_size / 1024.0) / 1024.0)) >= 1.0)

  {

  sprintf(dest,"%0.2fGB",(m_size/1024.0)/1024.0);

  }

  else if((m_size / 1024.0) >= 1.0)

  {

  sprintf(dest,"%0.2fMB",(m_size/1024));

  }

  else

  {

  sprintf(dest,"%0.2fKB",m_size);

  }

  return dest;

  }

  總結(jié):

  1、關(guān)于 struct statfs 結(jié)構(gòu)體信息參考:http://blog.csdn.net/u011641885/article/details/46919027

  2、對(duì)于fileSystem_total_size 使用float 類型,是為了精確度更高。buysbox 中的 fdisk 源碼使用的是整型相除,約為4舍五入。

  3、kscale 函數(shù)中 使用 unsigned long long 類型 是因?yàn)?m_block 與 m_byte 原本是long 型,相乘的結(jié)果超出了 long 類型的可以表示數(shù)據(jù)位。

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