152 lines
4.1 KiB
Groff
152 lines
4.1 KiB
Groff
.\" Copyright (c) 2006-2008 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.
|
|
.\"
|
|
.\" $Id$
|
|
.\"
|
|
.Dd October 22, 2007
|
|
.Os
|
|
.Dt ELF_GETSCN 3
|
|
.Sh NAME
|
|
.Nm elf_getscn ,
|
|
.Nm elf_ndxscn ,
|
|
.Nm elf_newscn ,
|
|
.Nm elf_nextscn
|
|
.Nd get/allocate section information for an ELF object
|
|
.Sh LIBRARY
|
|
.Lb libelf
|
|
.Sh SYNOPSIS
|
|
.In libelf.h
|
|
.Ft "Elf_Scn *"
|
|
.Fn elf_getscn "Elf *elf" "size_t index"
|
|
.Ft size_t
|
|
.Fn elf_ndxscn "Elf_Scn *scn"
|
|
.Ft "Elf_Scn *"
|
|
.Fn elf_newscn "Elf *elf"
|
|
.Ft "Elf_Scn *"
|
|
.Fn elf_nextscn "Elf *elf" "Elf_Scn *scn"
|
|
.Sh DESCRIPTION
|
|
These functions are used to iterate through the sections associated
|
|
with an ELF descriptor.
|
|
.Pp
|
|
Function
|
|
.Fn elf_getscn
|
|
will return a section descriptor for the section at index
|
|
.Ar index
|
|
in the object denoted by ELF descriptor
|
|
.Ar elf .
|
|
An error will be signalled if the specified section does not
|
|
exist.
|
|
.Pp
|
|
Function
|
|
.Fn elf_ndxscn
|
|
returns the section table index associated with section descriptor
|
|
.Ar scn .
|
|
.Pp
|
|
Function
|
|
.Fn elf_newscn
|
|
creates a new section and appends it to the list of sections
|
|
associated with descriptor
|
|
.Ar elf .
|
|
The library will automatically increment the
|
|
.Va e_shnum
|
|
field of the ELF header associated with descriptor
|
|
.Ar elf ,
|
|
and will set the
|
|
.Dv ELF_F_DIRTY
|
|
flag on the returned section descriptor.
|
|
For ELF descriptors opened for writing, the ELF library will
|
|
automatically create an empty section at index zero
|
|
.Dv ( SHN_UNDEF )
|
|
on the first call to
|
|
.Fn elf_newscn .
|
|
.Pp
|
|
Function
|
|
.Fn elf_nextscn
|
|
takes a section descriptor
|
|
.Ar scn
|
|
and returns a pointer to the section descriptor at the next higher
|
|
index.
|
|
Argument
|
|
.Ar scn
|
|
is allowed to be NULL, in which case this function will return a
|
|
pointer to the section descriptor at index 1.
|
|
If no further sections are present, function
|
|
.Fn elf_nextscn
|
|
will return a NULL pointer.
|
|
.Sh RETURN VALUES
|
|
Functions
|
|
.Fn elf_getscn ,
|
|
.Fn elf_newscn
|
|
and
|
|
.Fn elf_nextscn
|
|
return a valid pointer to a section descriptor if successful, or
|
|
NULL if an error occurs.
|
|
.Pp
|
|
Function
|
|
.Fn elf_ndxscn
|
|
returns a valid section table index if successful, or
|
|
.Dv SHN_UNDEF
|
|
if an error occurs.
|
|
.Sh ERRORS
|
|
These functions may fail with the following errors:
|
|
.Bl -tag -width "[ELF_E_RESOURCE]"
|
|
.It Bq Er ELF_E_ARGUMENT
|
|
Arguments
|
|
.Ar elf
|
|
or
|
|
.Ar scn
|
|
were NULL.
|
|
.It Bq Er ELF_E_ARGUMENT
|
|
Argument
|
|
.Ar index
|
|
exceeded the current number of sections in the ELF object.
|
|
.It Bq Er ELF_E_ARGUMENT
|
|
Argument
|
|
.Ar elf
|
|
was not a descriptor for an ELF file.
|
|
.It Bq Er ELF_E_ARGUMENT
|
|
Section descriptor
|
|
.Ar scn
|
|
was not associated with ELF descriptor
|
|
.Ar elf .
|
|
.It Bq Er ELF_E_CLASS
|
|
Descriptor
|
|
.Ar elf
|
|
was of an unknown ELF class.
|
|
.It Bq Er ELF_E_SECTION
|
|
Argument
|
|
.Ar elf
|
|
specified extended section numbering in the ELF header with the section header at
|
|
index
|
|
.Dv SHN_UNDEF
|
|
not being of type
|
|
.Dv SHT_NULL .
|
|
.El
|
|
.Sh SEE ALSO
|
|
.Xr elf 3 ,
|
|
.Xr elf_flagdata 3 ,
|
|
.Xr elf_flagscn 3 ,
|
|
.Xr elf_getdata 3 ,
|
|
.Xr elf_getshdr 3 ,
|
|
.Xr gelf 3
|