libblkid - phpMan

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 identifiers/serial numbers, etc.  A common
       use is to allow use of LABEL= and UUID= tags instead of hard-coding specific  block
       device names into configuration files.

       Block  device  information  is  normally kept in a cache file /etc/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 recommended (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
       reason 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 visible devices, so the  use  of  the
       cache file is required in this situation.

AUTHOR
       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.

FILES
       /etc/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 COPYING.  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

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 1.38             June 2005                       LIBBLKID(3)

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