Provided by: libblkid-dev_2.27.1-6ubuntu2_i386 bug


       libblkid - block device identification library


       #include <blkid.h>

       cc file.c -lblkid


       The  libblkid  library  is used to identify block devices (disks) as to
       their content (e.g.  filesystem type) as well as extracting  additional
       information    such   as   filesystem   labels/volume   names,   unique
       identifiers/serial numbers.  A common use is to allow use of LABEL= and
       UUID=  tags  instead  of  hard-coding  specific block device names into
       configuration files.

       The low-level part of the library also allows  to  extract  information
       about partitions and block device topology.

       The  high-level  part  of  the  library  keeps  information about block
       devices in a cache file and is verified to still be valid before  being
       returned  to the user (if the user has read permission on the raw block
       device, otherwise not).  The cache file also allows unprivileged  users
       (normally  anyone other than root, or those not in the "disk" group) to
       locate devices by label/id.  The standard location of  the  cache  file
       can be overridden by the environment variable BLKID_FILE.

       In  situations  where  one  is getting information about a single known
       device, it does not impact performance whether the cache is used or not
       (unless you are not able to read the block device directly).

       The  high-level  part  of  the library supports two methods to evaluate
       LABEL/UUID.  It reads information directly from a block device or  read
       information  from  /dev/disk/by-* udev symlinks.  The udev is preferred
       method by default.

       If you are dealing with multiple devices, use of the  cache  is  highly
       recommended (even if empty) as devices will be scanned at most one time
       and the on-disk cache will be updated if possible.

       In some cases (modular kernels), block devices  are  not  even  visible
       until  after  they  are accessed the first time, so it is critical that
       there is some way to locate  these  devices  without  enumerating  only
       visible  devices,  so  the  use  of  the cache file is required in this


       The standard  location  of  the  /etc/blkid.conf  config  file  can  be
       overridden  by  the  environment variable BLKID_CONF.  For more details
       about the config file see blkid(8) man page.


       libblkid  was  written  by  Andreas  Dilger  for  the  ext2  filesystem
       utilties,  with  input  from  Ted  Ts'o.   The library was subsequently
       heavily modified by Ted Ts'o.

       The low-level probing code was rewritten by Karel Zak.


       libblkid is available under the terms of the GNU Library General Public
       License (LGPL), version 2 (or at your discretion any later version).


       blkid(8), findfs(8)


       libblkid  is  part  of the util-linux package since version 2.15 and is
       available from