1.\" Copyright (c) 2002 The FreeBSD Project. 2.\" All rights reserved. 3.\" 4.\" Redistribution and use in source and binary forms, with or without 5.\" modification, are permitted provided that the following conditions 6.\" are met: 7.\" 1. Redistributions of source code must retain the above copyright 8.\" notice, this list of conditions and the following disclaimer. 9.\" 2. Redistributions in binary form must reproduce the above copyright 10.\" notice, this list of conditions and the following disclaimer in the 11.\" documentation and/or other materials provided with the distribution. 12.\" 13.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 14.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 15.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 16.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 17.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 18.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 19.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 20.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 21.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 22.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 23.\" SUCH DAMAGE. 24.\" 25.\" $FreeBSD$ 26.\" 27.Dd June 13, 2018 28.Dt GETOSRELDATE 3 29.Os 30.Sh NAME 31.Nm getosreldate 32.Nd get the value of 33.Dv __FreeBSD_version 34.Sh LIBRARY 35.Lb libc 36.Sh SYNOPSIS 37.In unistd.h 38.Ft int 39.Fn getosreldate void 40.Sh DESCRIPTION 41The 42.Fn getosreldate 43function returns an integer showing the version of the 44currently running 45.Fx 46kernel. 47Definitions of the values can be found in 48.%B "The Porter's Handbook": 49.Pp 50.Lk https://www.FreeBSD.org/doc/en/books/porters-handbook/ 51.Sh RETURN VALUES 52Upon successful completion, 53.Fn getosreldate 54returns the value requested; 55otherwise the value \-1 is returned and the global variable 56.Va errno 57is set to indicate the error. 58.Sh ENVIRONMENT 59.Bl -tag -width ".Ev OSVERSION" 60.It Ev OSVERSION 61If the environment variable 62.Ev OSVERSION 63is set, it will override the 64.Fn getosreldate 65return value. 66.El 67.Sh EXAMPLES 68An example can be found in 69.Pa /usr/share/examples/FreeBSD_version . 70.Sh ERRORS 71The 72.Fn getosreldate 73function may fail and set 74.Va errno 75for any of the errors specified for the library function 76.Xr sysctl 3 . 77.Sh SEE ALSO 78.Rs 79.%B "The Porter's Handbook" 80.Re 81.Sh HISTORY 82The 83.Fn getosreldate 84function appeared in 85.Fx 2.0 . 86