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.\" Copyright (c) 2006 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.
.\"
.\" $FreeBSD$
.\"
.Dd June 1, 2006
.Dt ELF_VERSION 3
.Os
.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(EX_SOFTWARE, "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
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