freebsd-dev/lib/libelf/elf_getbase.3
Kai Wang b2c6fcf986 * Improve compatibility with existing application code by permitting the
use of `elf_getbase()` on non-archive members. This change is needed
  for gcc LTO (-flto) to work properly.
* Style fix: paranthesize returned values.
* Document the current behaviour of `elf_getbase()`.

Tested by:	gerald, Steve Kargl (original patch)
Obtained from:	elftoolchain
MFC after:	3 days
2010-06-13 10:58:50 +00:00

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.\" Copyright (c) 2006,2008,2010 Joseph Koshy. All rights reserved.
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.\" $FreeBSD$
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.Dd June 6, 2010
.Dt ELF_GETBASE 3
.Os
.Sh NAME
.Nm elf_getbase
.Nd get the base offset for an object file
.Sh LIBRARY
.Lb libelf
.Sh SYNOPSIS
.In libelf.h
.Ft off_t
.Fn elf_getbase "Elf *elf"
.Sh DESCRIPTION
Function
.Fn elf_getbase
returns the file offset to the first byte of the object referenced by ELF
descriptor
.Ar elf .
.Pp
For descriptors referencing members of archives, the returned offset is
the file offset of the member in its containing archive.
For descriptors to regular objects, the returned offset is (vacuously)
zero.
.Sh RETURN VALUES
Function
.Fn elf_getbase
returns a valid file offset if successful, or
.Pq Vt off_t
.Li -1
in case of an error.
.Sh ERRORS
Function
.Fn elf_getbase
may fail with the following errors:
.Bl -tag -width "[ELF_E_RESOURCE]"
.It Bq Er ELF_E_ARGUMENT
Argument
.Ar elf
was NULL.
.El
.Sh SEE ALSO
.Xr elf 3 ,
.Xr elf_getarhdr 3 ,
.Xr elf_getident 3 ,
.Xr elf_rawfile 3 ,
.Xr gelf 3