195 lines
5.4 KiB
Groff
195 lines
5.4 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_FLAGDATA 3
|
||
|
|
.Sh NAME
|
||
|
|
.Nm elf_flagarhdr ,
|
||
|
|
.Nm elf_flagdata ,
|
||
|
|
.Nm elf_flagehdr ,
|
||
|
|
.Nm elf_flagelf ,
|
||
|
|
.Nm elf_flagphdr ,
|
||
|
|
.Nm elf_flagscn ,
|
||
|
|
.Nm elf_flagshdr
|
||
|
|
.Nd manipulate flags associated with ELF(3) data structures
|
||
|
|
.Sh LIBRARY
|
||
|
|
.Lb libelf
|
||
|
|
.Sh SYNOPSIS
|
||
|
|
.In libelf.h
|
||
|
|
.Ft "unsigned int"
|
||
|
|
.Fn elf_flagarhdr "Elf_Arhdr *arhdr" "Elf_Cmd cmd" "unsigned int flags"
|
||
|
|
.Ft "unsigned int"
|
||
|
|
.Fn elf_flagdata "Elf_Data *data" "Elf_Cmd cmd" "unsigned int flags"
|
||
|
|
.Ft "unsigned int"
|
||
|
|
.Fn elf_flagehdr "Elf *elf" "Elf_Cmd cmd" "unsigned int flags"
|
||
|
|
.Ft "unsigned int"
|
||
|
|
.Fn elf_flagelf "Elf *elf" "Elf_Cmd cmd" "unsigned int flags"
|
||
|
|
.Ft "unsigned int"
|
||
|
|
.Fn elf_flagphdr "Elf *elf" "Elf_Cmd cmd" "unsigned int flags"
|
||
|
|
.Ft "unsigned int"
|
||
|
|
.Fn elf_flagscn "Elf_Scn *scn" "Elf_Cmd cmd" "unsigned int flags"
|
||
|
|
.Ft "unsigned int"
|
||
|
|
.Fn elf_flagshdr "Elf_Scn *scn" "Elf_Cmd cmd" "unsigned int flags"
|
||
|
|
.Sh DESCRIPTION
|
||
|
|
These functions are used to query, set or reset flags on data
|
||
|
|
structures associated with an ELF file.
|
||
|
|
.Pp
|
||
|
|
Arguments
|
||
|
|
.Ar arhdr ,
|
||
|
|
.Ar data ,
|
||
|
|
.Ar elf
|
||
|
|
and
|
||
|
|
.Ar scn
|
||
|
|
denote the data structures whose flags need to be changed.
|
||
|
|
These values are allowed to be NULL to simplify error handling in
|
||
|
|
application code.
|
||
|
|
.Pp
|
||
|
|
Argument
|
||
|
|
.Ar cmd
|
||
|
|
may have the following values:
|
||
|
|
.Bl -tag -width ELF_C_SET
|
||
|
|
.It Dv ELF_C_CLR
|
||
|
|
The argument
|
||
|
|
.Ar flags
|
||
|
|
specifies the flags to be cleared.
|
||
|
|
.It Dv ELF_C_SET
|
||
|
|
The argument
|
||
|
|
.Ar flags
|
||
|
|
specifies the flags to be set.
|
||
|
|
.El
|
||
|
|
.Pp
|
||
|
|
The argument
|
||
|
|
.Ar flags
|
||
|
|
is allowed to have the following flags set:
|
||
|
|
.Bl -tag -width ELF_F_ARCHIVE_SYSV
|
||
|
|
.It Dv ELF_F_ARCHIVE
|
||
|
|
This flag is only valid with the
|
||
|
|
.Fn elf_flagelf
|
||
|
|
API.
|
||
|
|
It informs the library that the application desires to create an
|
||
|
|
.Xr ar 1
|
||
|
|
archive.
|
||
|
|
Argument
|
||
|
|
.Ar elf
|
||
|
|
should have been opened for writing using the
|
||
|
|
.Dv ELF_C_WRITE
|
||
|
|
command to function
|
||
|
|
.Fn elf_begin .
|
||
|
|
.It Dv ELF_F_ARCHIVE_SYSV
|
||
|
|
This flag is used in conjunction with the
|
||
|
|
.Dv ELF_F_ARCHIVE
|
||
|
|
flag to indicate that library should create archives that conform
|
||
|
|
to System V layout rules.
|
||
|
|
The default is to create BSD style archives.
|
||
|
|
.It Dv ELF_F_DIRTY
|
||
|
|
Mark the associated data structure as needing to be written back
|
||
|
|
to the underlying file.
|
||
|
|
A subsequent call to
|
||
|
|
.Xr elf_update 3
|
||
|
|
will resynchronize the library's internal data structures.
|
||
|
|
.It Dv ELF_F_LAYOUT
|
||
|
|
This flag is only valid with the
|
||
|
|
.Fn elf_flagelf
|
||
|
|
API.
|
||
|
|
It informs the library that the application will take
|
||
|
|
responsibility for the layout of the file and that the library is
|
||
|
|
not to insert any padding in between sections.
|
||
|
|
.El
|
||
|
|
.Pp
|
||
|
|
Marking a given data structure as
|
||
|
|
.Dq dirty
|
||
|
|
affects all of its contained elements.
|
||
|
|
Thus marking an ELF descriptor
|
||
|
|
.Ar elf
|
||
|
|
with
|
||
|
|
.Fn elf_flagelf "elf" "ELF_C_SET" "ELF_F_DIRTY"
|
||
|
|
means that the entire contents of the descriptor are
|
||
|
|
.Dq dirty .
|
||
|
|
.Pp
|
||
|
|
Using a value of zero for argument
|
||
|
|
.Ar flags
|
||
|
|
will return the current set of flags for the data structure being
|
||
|
|
queried.
|
||
|
|
.Sh RETURN VALUES
|
||
|
|
These functions return the updated flags is successful, and zero if
|
||
|
|
an error is detected.
|
||
|
|
.Sh COMPATIBILITY
|
||
|
|
The
|
||
|
|
.Fn elf_flagarhdr
|
||
|
|
function and the
|
||
|
|
.Dv ELF_F_ARCHIVE
|
||
|
|
and
|
||
|
|
.Dv ELF_F_ARCHIVE_SYSV
|
||
|
|
flags are an extension to the ELF(3) API.
|
||
|
|
.Sh ERRORS
|
||
|
|
These functions may fail with the following errors:
|
||
|
|
.Bl -tag -width "[ELF_E_RESOURCE]"
|
||
|
|
.It Bq Er ELF_E_ARGUMENT
|
||
|
|
An unsupported value was used for the
|
||
|
|
.Ar cmd
|
||
|
|
argument.
|
||
|
|
.It Bq Er ELF_E_ARGUMENT
|
||
|
|
Argument
|
||
|
|
.Ar flags
|
||
|
|
had unsupported flags set.
|
||
|
|
.It Bq Er ELF_E_ARGUMENT
|
||
|
|
The argument
|
||
|
|
.Ar elf
|
||
|
|
was not a descriptor for an ELF object.
|
||
|
|
.It Bq Er ELF_E_MODE
|
||
|
|
The
|
||
|
|
.Dv ELF_F_ARCHIVE
|
||
|
|
flag was used with an ELF descriptor that had not been opened for writing.
|
||
|
|
.It Bq Er ELF_E_SEQUENCE
|
||
|
|
Function
|
||
|
|
.Fn elf_flagehdr
|
||
|
|
was called without an executable header being allocated.
|
||
|
|
.It Bq Er ELF_E_SEQUENCE
|
||
|
|
Function
|
||
|
|
.Fn elf_flagphdr
|
||
|
|
was called without a program header being allocated.
|
||
|
|
.El
|
||
|
|
.Sh SEE ALSO
|
||
|
|
.Xr elf 3 ,
|
||
|
|
.Xr elf32_newehdr 3 ,
|
||
|
|
.Xr elf32_newphdr 3 ,
|
||
|
|
.Xr elf32_newshdr 3 ,
|
||
|
|
.Xr elf64_newehdr 3 ,
|
||
|
|
.Xr elf64_newphdr 3 ,
|
||
|
|
.Xr elf64_newshdr 3 ,
|
||
|
|
.Xr elf_newdata 3 ,
|
||
|
|
.Xr elf_update 3 ,
|
||
|
|
.Xr gelf 3 ,
|
||
|
|
.Xr gelf_newehdr 3 ,
|
||
|
|
.Xr gelf_newphdr 3 ,
|
||
|
|
.Xr gelf_newshdr 3 ,
|
||
|
|
.Xr gelf_update_dyn 3 ,
|
||
|
|
.Xr gelf_update_move 3 ,
|
||
|
|
.Xr gelf_update_rel 3 ,
|
||
|
|
.Xr gelf_update_rela 3 ,
|
||
|
|
.Xr gelf_update_sym 3 ,
|
||
|
|
.Xr gelf_update_syminfo 3
|