to check version to library

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LEARN ABOUT OPENDARWIN

elf_version

elf_version(3ELF)					       ELF Library Functions						 elf_version(3ELF)

NAME

       elf_version - coordinate ELF library and application versions

SYNOPSIS

       cc [ flag ... ] file ... -lelf [ library ... ]
       #include <libelf.h>

       unsigned elf_version(unsigned ver);

DESCRIPTION

       As  elf(3ELF) explains, the program, the library, and an object file have independent notions of the latest ELF version. elf_version() lets
       a program query the ELF library's internal version. It further lets the program specify what memory types it uses by giving its own working
       version, ver, to the library. Every program that uses the ELF library must coordinate versions as described below.

       The header <libelf.h> supplies the version to the program with the macro EV_CURRENT. If the library's internal version (the highest version
       known to the library) is lower than that known by the program itself, the library may lack  semantic  knowledge	assumed  by  the  program.
       Accordingly, elf_version() will not accept a working version unknown to the library.

       Passing ver equal to EV_NONE causes elf_version() to return the library's internal version, without altering the working version. If ver is
       a version known to the library, elf_version() returns the previous (or initial) working version	number.  Otherwise,  the  working  version
       remains unchanged and elf_version() returns EV_NONE.

EXAMPLES

       Example 1: A sample display of using the elf_version() function.

       The following excerpt from an application program protects itself from using an older library:

       if (elf_version(EV_CURRENT) == EV_NONE) {
	    /* library out of date */
	    /* recover from error */
       }

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Stable			   |
       +-----------------------------+-----------------------------+
       |MT-Level		     |MT-Safe			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       elf(3ELF), elf32_xlatetof(3ELF), elf_begin(3ELF), libelf(3LIB), attributes(5)

NOTES

       The  working  version  should  be  the same for all operations on a particular ELF descriptor. Changing the version between operations on a
       descriptor will probably not give the expected results.

SunOS 5.10							    11 Jul 2001 						 elf_version(3ELF)

Programming