122 lines
3.4 KiB
Groff
122 lines
3.4 KiB
Groff
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.\" Copyright (c) 2012 Joseph Koshy. All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" This software is provided by Joseph Koshy ``as is'' and
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.\" any express or implied warranties, including, but not limited to, the
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.\" implied warranties of merchantability and fitness for a particular purpose
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.\" are disclaimed. in no event shall Joseph Koshy be liable
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.\" for any direct, indirect, incidental, special, exemplary, or consequential
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.\" damages (including, but not limited to, procurement of substitute goods
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.\" or services; loss of use, data, or profits; or business interruption)
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.\" however caused and on any theory of liability, whether in contract, strict
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.\" liability, or tort (including negligence or otherwise) arising in any way
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.\" out of the use of this software, even if advised of the possibility of
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.\" such damage.
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.\"
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.\" $Id: elf_open.3 2512 2012-05-31 06:15:57Z jkoshy $
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.\"
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.Dd May 31, 2012
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.Os
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.Dt ELF_OPEN 3
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.Sh NAME
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.Nm elf_open
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.Nd open ELF objects and ar(1) archives
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.Sh LIBRARY
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.Lb libelf
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.Sh SYNOPSIS
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.In libelf.h
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.Ft "Elf *"
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.Fn elf_open "int fd"
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.Ft "Elf *"
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.Fn elf_openmemory "char *image" "size_t sz"
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.Sh DESCRIPTION
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.Em Important :
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The functions
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.Fn elf_open
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and
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.Fn elf_openmemory
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are extensions to the ELF(3) API, for the internal use of the
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Elftoolchain project.
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Portable applications should not use these functions.
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.Pp
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The function
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.Fn elf_open
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returns an Elf descriptor opened with mode
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.Dv ELF_C_READ
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for the ELF object or
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.Xr ar 1
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archive referenced by the file descriptor in argument
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.Ar fd .
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.Pp
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The function
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.Fn elf_openmemory
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returns an ELF descriptor opened with mode
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.Dv ELF_C_READ
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for the ELF object or
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.Xr ar 1
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archive contained in the memory area pointed to by the argument
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.Ar image .
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The argument
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.Ar sz
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specifies the size of the memory area in bytes.
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.Sh COMPATIBILITY
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These functions are non-standard extensions to the ELF(3) API set.
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.Pp
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The behavior of these functions differs from their counterparts
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.Xr elf_begin 3
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and
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.Xr elf_memory 3
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in that these functions will successfully open malformed ELF objects
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and
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.Xr ar 1
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archives, returning an Elf descriptor of type
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.Dv ELF_K_NONE .
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.Sh RETURN VALUES
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The function returns a pointer to a ELF descriptor if successful, or
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NULL if an error occurred.
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.Sh ERRORS
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These functions can fail with the following errors:
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.Bl -tag -width "[ELF_E_RESOURCE]"
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.It Bq Er ELF_E_ARGUMENT
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The argument
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.Ar fd
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was of an unsupported file type.
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.It Bq Er ELF_E_ARGUMENT
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The argument
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.Ar sz
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was zero, or the argument
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.Ar image
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was NULL.
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.It Bq Er ELF_E_IO
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The file descriptor in argument
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.Ar fd
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was invalid.
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.It Bq Er ELF_E_IO
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The file descriptor in argument
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.Ar fd
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could not be read.
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.It Bq Er ELF_E_RESOURCE
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An out of memory condition was encountered.
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.It Bq Er ELF_E_SEQUENCE
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Functions
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.Fn elf_open
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or
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.Fn elf_openmemory
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was called before a working version was established with
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.Xr elf_version 3 .
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.El
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.Sh SEE ALSO
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.Xr elf 3 ,
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.Xr elf_begin 3 ,
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.Xr elf_errno 3 ,
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.Xr elf_memory 3 ,
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.Xr gelf 3
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