mirror of
https://git.FreeBSD.org/src.git
synced 2024-12-24 11:29:10 +00:00
73 lines
2.5 KiB
Groff
73 lines
2.5 KiB
Groff
.\" Copyright (c) 2008 Yahoo!, Inc.
|
|
.\" All rights reserved.
|
|
.\" Written by: 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.
|
|
.\" 3. Neither the name of the author nor the names of any co-contributors
|
|
.\" may be used to endorse or promote products derived from this software
|
|
.\" without specific prior written permission.
|
|
.\"
|
|
.\" 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.
|
|
.\"
|
|
.\" $FreeBSD$
|
|
.\"
|
|
.Dd January 8, 2008
|
|
.Dt FEATURE_PRESENT 3
|
|
.Os
|
|
.Sh NAME
|
|
.Nm feature_present
|
|
.Nd query presence of a kernel feature
|
|
.Sh LIBRARY
|
|
.Lb libc
|
|
.Sh SYNOPSIS
|
|
.In unistd.h
|
|
.Ft int
|
|
.Fn feature_present "const char *feature"
|
|
.Sh DESCRIPTION
|
|
The
|
|
.Fn feature_present
|
|
function provides a method for an application to determine if a specific
|
|
kernel feature is present in the currently running kernel.
|
|
The
|
|
.Fa feature
|
|
argument specifies the name of the feature to check.
|
|
The
|
|
.Fn feature_present
|
|
function will return 1 if the specified feature is present,
|
|
otherwise it will return 0.
|
|
If the
|
|
.Fn feature_present
|
|
function is not able to determine the presence of
|
|
.Fa feature
|
|
due to an internal error it will return 0.
|
|
.Sh RETURN VALUES
|
|
If
|
|
.Fa feature
|
|
is present then 1 is returned;
|
|
otherwise 0 is returned.
|
|
.Sh SEE ALSO
|
|
.Xr sysconf 3 ,
|
|
.Xr sysctl 3
|
|
.Sh HISTORY
|
|
The
|
|
.Fn feature_present
|
|
function first appeared in
|
|
.Fx 8.0 .
|