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DISKMAP(4)               BSD Kernel Interfaces Manual               DISKMAP(4)

NAME
     diskmap -- disklabel UID mapping interface

SYNOPSIS
     #include <&lt;sys/dkio.h>&gt;

DESCRIPTION
     The diskmap driver provides userland applications with a means to map a
     disklabel UID to an actual device and open that device in one atomic
     operation.  This is achieved via the DIOCMAP ioctl(2) command.

     The ability to use a disklabel UID is helpful in situations where a disk
     may appear to the operating system under different device names.  For
     example, plugging USB keys into differently configured systems (think sd0
     or sd1), or swapping between IDE and AHCI on a disk controller (wd0 or
     sd0).  Although the device names may change, the operating system is
     still able to identify the disk by its UID.

FILES
     /dev/diskmap  diskmap device

SEE ALSO
     ioctl(2), disklabel(8)

HISTORY
     The diskmap driver first appeared in OpenBSD 4.8.

AUTHORS
     The diskmap driver was written by Joel Sing.

BSD                            September 7, 2010                           BSD