73 lines
2.5 KiB
Groff
73 lines
2.5 KiB
Groff
.\" Copyright (c) 2008 Yahoo!, Inc.
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.\" All rights reserved.
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.\" Written by: John Baldwin <jhb@FreeBSD.org>
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. Neither the name of the author nor the names of any co-contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" $FreeBSD$
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.\"
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.Dd January 8, 2008
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.Dt FEATURE_PRESENT 3
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.Os
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.Sh NAME
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.Nm feature_present
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.Nd query presence of a kernel feature
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.Sh LIBRARY
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.Lb libc
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.Sh SYNOPSIS
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.In unistd.h
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.Ft int
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.Fn feature_present "const char *feature"
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.Sh DESCRIPTION
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The
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.Fn feature_present
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function provides a method for an application to determine if a specific
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kernel feature is present in the currently running kernel.
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The
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.Fa feature
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argument specifies the name of the feature to check.
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The
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.Fn feature_present
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function will return 1 if the specified feature is present,
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otherwise it will return 0.
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If the
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.Fn feature_present
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function is not able to determine the presence of
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.Fa feature
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due to an internal error it will return 0.
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.Sh RETURN VALUES
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If
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.Fa feature
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is present then 1 is returned;
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otherwise 0 is returned.
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.Sh SEE ALSO
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.Xr sysconf 3 ,
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.Xr sysctl 3
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.Sh HISTORY
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The
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.Fn feature_present
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function first appeared in
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.Fx 8.0 .
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