2006-11-11 17:16:35 +00:00
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.\" Copyright (c) 2006 Joseph Koshy. 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 Joseph Koshy ``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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.\" are disclaimed. in no event shall Joseph Koshy be liable
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.\" for any direct, indirect, incidental, special, exemplary, or consequential
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.\" damages (including, but not limited to, procurement of substitute goods
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.\" or services; loss of use, data, or profits; or business interruption)
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.\" however caused and on any theory of liability, whether in contract, strict
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.\" liability, or tort (including negligence or otherwise) arising in any way
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.\" out 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 June 1, 2006
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.Os
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2006-11-13 09:46:16 +00:00
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.Dt ELF_VERSION 3
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2006-11-11 17:16:35 +00:00
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.Sh NAME
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.Nm elf_version
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.Nd retrieve or set ELF library operating version
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.Sh LIBRARY
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.Lb libelf
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.Sh SYNOPSIS
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.In libelf.h
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.Ft unsigned int
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.Fn elf_version "unsigned int version"
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.Sh DESCRIPTION
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The
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.Fn elf_version
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function is used to query the current operating version of the ELF
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library, and to inform the ELF library about the application's desired
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operating version.
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.Pp
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If the argument
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.Ar version
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is
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.Dv EV_NONE ,
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the
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.Fn elf_version
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function returns the currently configured operating version for the
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ELF library.
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.Pp
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If the argument
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.Ar version
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is not
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.Dv EV_NONE ,
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and if argument
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.Ar version
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is supported by the ELF library, function
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.Fn elf_version
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sets the library's operating version to
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.Ar version ,
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and returns the previous value of the operating version.
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If argument
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.Ar version
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cannot be supported, then the
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.Fn elf_version
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function returns
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.Dv EV_NONE .
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.Sh RETURN VALUES
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The
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.Fn elf_version
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function returns the currently configured ELF library version, or
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.Dv EV_NONE
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if an unsupported version is requested.
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.Sh EXAMPLES
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An application program would inform the ELF library about its desired
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operating version and check for an error using the following code
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snippet:
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.Bd -literal -offset indent
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if (elf_version(EV_CURRENT) == EV_NONE)
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err(EX_SOFTWARE, "ELF library too old");
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.Ed
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.Sh ERRORS
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Function
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.Fn elf_version
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may fail with the following error:
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.Bl -tag -width "[ELF_E_RESOURCE]"
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.It Bq Er "ELF_E_VERSION"
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An unsupported library version number was requested.
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.El
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.Sh SEE ALSO
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.Xr elf 3 ,
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.Xr gelf 3
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