Add man page for diskmap(4).

Feedback from krw@ and jmc@.

ok krw@ jmc@

2 files changed, 54 insertions, 3 deletions

diff --git a/share/man/man4/Makefile b/share/man/man4/Makefile
index 1b29c882dc7..aa967559f5d 100644
--- a/share/man/man4/Makefile
+++ b/share/man/man4/Makefile
@@ -1,4 +1,4 @@
-#	$OpenBSD: Makefile,v 1.513 2010/07/31 08:33:20 ratchov Exp $
+#	$OpenBSD: Makefile,v 1.514 2010/08/19 15:45:35 jsing Exp $
 
 MAN=	aac.4 ac97.4 acphy.4 \
 	acpi.4 acpiac.4 acpiasus.4 acpibat.4 acpibtn.4 acpicpu.4 acpidock.4 \
@@ -16,8 +16,9 @@ MAN=	aac.4 ac97.4 acphy.4 \
 	boca.4 bpf.4 brgphy.4 bridge.4 btkbd.4 btms.4 btsco.4 bwi.4 \
 	cac.4 cas.4 cardbus.4 carp.4 ccd.4 cd.4 cdce.4 cdcef.4 che.4 cfxga.4 \
 	ch.4 ciphy.4 ciss.4 clcs.4 clct.4 cmpci.4 cnw.4 \
-	com.4 crypto.4 cue.4 cy.4 cz.4 dc.4 dcphy.4 ddb.4 de.4 divert.4 dpt.4 \
-	drm.4 eap.4 ec.4 eephy.4 ef.4 eg.4 ehci.4 eisa.4 el.4 em.4 gcu.4 \
+	com.4 crypto.4 cue.4 cy.4 cz.4 dc.4 dcphy.4 ddb.4 de.4 \
+	diskmap.4 divert.4 dpt.4 drm.4 \
+	eap.4 ec.4 eephy.4 ef.4 eg.4 ehci.4 eisa.4 el.4 em.4 gcu.4 \
 	emu.4 enc.4 endrun.4 envy.4 ep.4 epic.4 esa.4 \
 	eso.4 ess.4 et.4 etphy.4 ex.4 exphy.4 \
 	faith.4 fd.4 fdc.4 fins.4 fintek.4 fms.4 fpa.4 fxp.4 gdt.4 \
diff --git a/share/man/man4/diskmap.4 b/share/man/man4/diskmap.4
new file mode 100644
index 00000000000..bbe9f115c1c
--- /dev/null
+++ b/share/man/man4/diskmap.4
@@ -0,0 +1,50 @@
+.\"     $OpenBSD: diskmap.4,v 1.1 2010/08/19 15:45:35 jsing Exp $
+.\"
+.\" Copyright (c) 2010 Joel Sing <jsing@openbsd.org>
+.\"
+.\" Permission to use, copy, modify, and distribute this software for any
+.\" purpose with or without fee is hereby granted, provided that the above
+.\" copyright notice and this permission notice appear in all copies.
+.\"
+.\" THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+.\" WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+.\" MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+.\" ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+.\" WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+.\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+.\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+.\"
+.Dd $Mdocdate: August 19 2010 $
+.Dt DISKMAP 4
+.Os
+.Sh NAME
+.Nm diskmap
+.Nd disklabel UID mapping interface
+.Sh SYNOPSIS
+.Fd #include <sys/dkio.h>
+.Sh DESCRIPTION
+The
+.Nm
+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
+.Xr ioctl 2
+command.
+.Sh FILES
+.Bl -tag -width /dev/diskmap -compact
+.It Pa /dev/diskmap
+diskmap device
+.El
+.Sh SEE ALSO
+.Xr ioctl 2 ,
+.Xr MAKEDEV 8
+.Sh HISTORY
+The
+.Nm
+driver first appeared in
+.Ox 4.8 .
+.Sh AUTHORS
+The
+.Nm
+driver was written by
+.An Joel Sing .