90 lines
3.0 KiB
Groff
90 lines
3.0 KiB
Groff
.\"
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.\" Copyright 2002 Massachusetts Institute of Technology
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.\"
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.\" Permission to use, copy, modify, and distribute this software and
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.\" its documentation for any purpose and without fee is hereby
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.\" granted, provided that both the above copyright notice and this
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.\" permission notice appear in all copies, that both the above
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.\" copyright notice and this permission notice appear in all
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.\" supporting documentation, and that the name of M.I.T. not be used
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.\" in advertising or publicity pertaining to distribution of the
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.\" software without specific, written prior permission. M.I.T. makes
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.\" no representations about the suitability of this software for any
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.\" purpose. It is provided "as is" without express or implied
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.\" warranty.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY M.I.T. ``AS IS''. M.I.T. DISCLAIMS
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.\" ALL EXPRESS OR IMPLIED WARRANTIES WITH REGARD TO THIS SOFTWARE,
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.\" INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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.\" MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT
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.\" SHALL M.I.T. BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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.\" SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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.\" LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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.\" USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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.\" ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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.\" OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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.\" 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 October 27, 2002
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.Os
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.Dt CHECK_UTILITY_COMPAT 3
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.Sh NAME
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.Nm check_utility_compat
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.Nd "determine whether a utility should be compatible"
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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 check_utility_compat "const char *utility"
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.Sh DESCRIPTION
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The
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.Fn check_utility_compat
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function checks whether
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.Fa utility
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should behave in a traditional
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.Pq Fx 4.7 Ns -compatible
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manner, or in accordance with
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.St -p1003.1-2001 .
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The configuration is given as a comma-separated list of utility names;
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if the list is present but empty, all supported utilities assume their
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most compatible mode.
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The
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.Fn check_utility_compat
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function first checks for an environment variable named
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.Ev _COMPAT_FreeBSD_4 .
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If that environment variable does not exist, then
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.Fn check_utility_compat
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will attempt to read the contents of a symbolic link named
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.Pa /etc/compat-FreeBSD-4-util .
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If no configuration is found, compatibility mode is disabled.
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.Sh RETURN VALUES
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The
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.Fn check_utility_compat
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function returns zero if
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.Fa utility
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should implement strict
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.St -p1003.1-2001
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behavior, and nonzero otherwise.
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.Sh ERRORS
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No errors are detected.
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.Sh FILES
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.Bl -tag -width ".Pa /etc/compat-FreeBSD-4-util"
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.It Pa /etc/compat-FreeBSD-4-util
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If present, a symbolic link whose expansion gives system-wide default settings
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for the
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.Fn check_utility_compat
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function.
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.El
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.Sh HISTORY
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The
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.Fn check_utility_compat
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function first appeared in
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.Fx 5.0 .
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.Sh AUTHORS
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This manual page was written by
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.An Garrett Wollman Aq wollman@FreeBSD.org .
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