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.\" Copyright (c) 2002 The FreeBSD Project.
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.\" All rights reserved.
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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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.\"
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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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.\" SUCH DAMAGE.
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.\"
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.\" $FreeBSD$
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.\"
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2018-06-13 18:34:49 +00:00
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.Dd June 13, 2018
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.Dt GETOSRELDATE 3
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.Os
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.Sh NAME
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.Nm getosreldate
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.Nd get the value of
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.Dv __FreeBSD_version
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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 getosreldate void
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.Sh DESCRIPTION
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The
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.Fn getosreldate
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function returns an integer showing the version of the
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currently running
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.Fx
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kernel.
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Definitions of the values can be found in
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.%B "The Porter's Handbook":
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.Pp
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.Lk https://www.FreeBSD.org/doc/en/books/porters-handbook/
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.Sh RETURN VALUES
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Upon successful completion,
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.Fn getosreldate
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returns the value requested;
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otherwise the value \-1 is returned and the global variable
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.Va errno
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is set to indicate the error.
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2005-12-03 05:11:07 +00:00
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.Sh ENVIRONMENT
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.Bl -tag -width ".Ev OSVERSION"
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.It Ev OSVERSION
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If the environment variable
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.Ev OSVERSION
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is set, it will override the
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.Fn getosreldate
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return value.
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.El
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.Sh EXAMPLES
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An example can be found in
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.Pa /usr/share/examples/FreeBSD_version .
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.Sh ERRORS
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The
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.Fn getosreldate
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function may fail and set
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.Va errno
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for any of the errors specified for the library function
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.Xr sysctl 3 .
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.Sh SEE ALSO
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.Rs
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.%B "The Porter's Handbook"
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.Re
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.Sh HISTORY
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The
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.Fn getosreldate
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function appeared in
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.Fx 2.0 .
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