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+.\"
+.\" Copyright (c) 2015 John Baldwin <jhb@FreeBSD.org>
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.Dd October 17, 2016
+.Dt sysdecode_ioctlname 3
+.Os
+.Sh NAME
+.Nm sysdecode_ioctlname
+.Nd lookup name of device control command
+.Sh LIBRARY
+.Lb libsysdecode
+.Sh SYNOPSIS
+.In sysdecode.h
+.Ft const char *
+.Fn sysdecode_ioctlname "unsigned long request"
+.Sh DESCRIPTION
+The
+.Fn sysdecode_ioctlname
+function returns the name of a device control request identified by
+.Fa request .
+A table of names is generated during the build of the
+.Nm sysdecode
+library from system headers that maps device control request values to
+the name of the corresponding C macro.
+.Sh RETURN VALUES
+The
+.Fn sysdecode_ioctlname
+function returns the name of a device control request if
+.Fa request
+is a known value;
+otherwise
+.Dv NULL .
+.Sh SEE ALSO
+.Xr sysdecode 3