libblkid man page on Archlinux

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LIBBLKID(3)		      Programmer's Manual		   LIBBLKID(3)

       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 identi‐
       fiers/serial numbers.  A common use is to allow use of LABEL= and UUID=
       tags instead of hard-coding specific block device names into configura‐
       tion 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 vis‐
       ible  devices,  so the use of the cache file is required in this situa‐

       The standard location of the /etc/blkid.conf config file can  be	 over‐
       ridden  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	 util‐
       ties,  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

util-linux			   May 2009			   LIBBLKID(3)

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