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$FreeBSD$
.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 n 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.
p If the argument .Ar version is .Dv EV_NONE , the .Fn elf_version function returns the currently configured operating version for the ELF library.
p 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: d -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: l -tag -width "[ELF_E_RESOURCE]" t Bq Er "ELF_E_VERSION" An unsupported library version number was requested. .El .Sh SEE ALSO .Xr elf 3 , .Xr gelf 3