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+.\" Copyright (c) 2006,2008 Joseph Koshy.  All rights reserved.
+.\"
+.\" 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.
+.\"
+.\" This software is provided by Joseph Koshy ``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 Joseph Koshy 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.
+.\"
+.\" $Id: elf_version.3 2123 2011-11-09 15:40:09Z jkoshy $
+.\"
+.Dd November 9, 2011
+.Os
+.Dt ELF_VERSION 3
+.Sh NAME
+.Nm elf_version
+.Nd retrieve or set ELF library operating version
+.Sh LIBRARY
+.Lb libelf
+.Sh SYNOPSIS
+.In libelf.h
+.Ft unsigned int
+.Fn elf_version "unsigned int version"
+.Sh DESCRIPTION
+The
+.Fn elf_version
+function is used to query the current operating version of the ELF
+library, and to inform the ELF library about the application's desired
+operating version.
+.Pp
+If the argument
+.Ar version
+is
+.Dv EV_NONE ,
+the
+.Fn elf_version
+function returns the currently configured operating version for the
+ELF library.
+.Pp
+If the argument
+.Ar version
+is not
+.Dv EV_NONE ,
+and if argument
+.Ar version
+is supported by the ELF library, function
+.Fn elf_version
+sets the library's operating version to
+.Ar version ,
+and returns the previous value of the operating version.
+If argument
+.Ar version
+cannot be supported, then the
+.Fn elf_version
+function returns
+.Dv EV_NONE .
+.Sh RETURN VALUES
+The
+.Fn elf_version
+function returns the currently configured ELF library version, or
+.Dv EV_NONE
+if an unsupported version is requested.
+.Sh EXAMPLES
+An application program would inform the ELF library about its desired
+operating version and check for an error using the following code
+snippet:
+.Bd -literal -offset indent
+if (elf_version(EV_CURRENT) == EV_NONE)
+	err(EXIT_FAILURE, "ELF library too old");
+.Ed
+.Sh ERRORS
+Function
+.Fn elf_version
+may fail with the following error:
+.Bl -tag -width "[ELF_E_RESOURCE]"
+.It Bq Er "ELF_E_VERSION"
+An unsupported library version number was requested.
+.El
+.Sh SEE ALSO
+.Xr elf 3 ,
+.Xr gelf 3