libblkid man page on YellowDog

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LIBBLKID(3)							   LIBBLKID(3)

NAME
       libblkid - block device identification library

SYNOPSIS
       #include <blkid/blkid.h>

       cc file.c -lblkid

DESCRIPTION
       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, etc.  A common use is to allow use of LABEL=  and
       UUID= tags instead of hard-coding specific block device names into con‐
       figuration files.

       Block  device  information  is  normally	  kept	 in   a	  cache	  file
       /etc/blkid/blkid.tab  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.

       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).	If you
       are dealing with multiple devices use of the  cache  is	highly	recom‐
       mended (even if empty) as devices will be scanned at most one time, and
       the on-disk cache will be updated if possible.  There is rarely a  rea‐
       son not to use the cache.

       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‐
       tion.

AUTHOR
       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.

FILES
       /etc/blkid/blkid.tab
	      Caches data extracted from each recognized block device.

AVAILABILITY
       libblkid	 is  part  of  the e2fsprogs package since version 1.33 and is
       available from http://e2fsprogs.sourceforge.net.

COPYING
       libblkid is available under the terms of the GNU Library General Public
       License (LGPL), version 2 (or at your discretion any later version).  A
       copy of the LGPL should be included with this library in the file COPY‐
       ING.  If not, write to
	      Free Software Foundation, Inc.
	      59 Temple Place
	      Suite 330
	      Boston, MA  02111-1307  USA

       or	  visit		http://www.gnu.org/licenses/licenses.html#LGPL
       ⟨http://www.gnu.org/licenses/licenses.html#LGPL⟩

SEE ALSO
       blkid_get_cache(3),	  blkid_put_cache(3),	     blkid_get_dev(3),
       blkid_probe_all(3),    blkid_get_devname(3),    blkid_get_tag_value(3),
       blkid.tab(7)

E2fsprogs version 1.39		   May 2006			   LIBBLKID(3)
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