mirror of
https://git.FreeBSD.org/src.git
synced 2024-12-03 09:00:21 +00:00
123 lines
3.4 KiB
Groff
123 lines
3.4 KiB
Groff
.\" Copyright (c) 2006 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.
|
|
.\"
|
|
.\" $FreeBSD$
|
|
.\"
|
|
.Dd June 28, 2006
|
|
.Os
|
|
.Dt ELF_MEMORY 3
|
|
.Sh NAME
|
|
.Nm elf_memory
|
|
.Nd process an ELF or ar(1) archive mapped into memory
|
|
.Sh LIBRARY
|
|
.Lb libelf
|
|
.Sh SYNOPSIS
|
|
.In libelf.h
|
|
.Ft "Elf *"
|
|
.Fn elf_memory "char *image" "size_t size"
|
|
.Sh DESCRIPTION
|
|
Function
|
|
.Fn elf_memory
|
|
is used to process an ELF file or
|
|
.Xr ar 1
|
|
archive whose image is present in memory.
|
|
.Pp
|
|
Argument
|
|
.Ar image
|
|
points to the start of the memory image of the file or archive.
|
|
Argument
|
|
.Ar size
|
|
contains the size in bytes of the memory image.
|
|
.Pp
|
|
The ELF descriptor is created for reading (i.e., analogous to the
|
|
use of
|
|
.Xr elf_begin 3
|
|
with a command argument value of
|
|
.Dv ELF_C_READ Ns ).
|
|
.Sh RETURN VALUES
|
|
Function
|
|
.Fn elf_memory
|
|
returns a pointer to a new ELF descriptor if successful, or NULL if an
|
|
error occurred.
|
|
.Pp
|
|
The return value may be queried for the file type using
|
|
.Xr elf_kind 3 .
|
|
.Sh EXAMPLES
|
|
To read parse an elf file, use:
|
|
.Bd -literal -offset indent
|
|
int fd;
|
|
void *p;
|
|
struct stat sb;
|
|
Elf *e;
|
|
\&...
|
|
if ((fd = open("./elf-file", O_RDONLY)) < 0 ||
|
|
fstat(fd, &sb) < 0 ||
|
|
(p = mmap(NULL, sb.st_size, PROT_READ, MAP_PRIVATE, fd, (off_t) 0)) ==
|
|
MAP_FAILED) {
|
|
... handle system error ...
|
|
}
|
|
|
|
if ((e = elf_memory(p, sb.st_size)) == NULL) {
|
|
... handle elf(3) error ...
|
|
}
|
|
\&... use ELF descriptor "e" here ...
|
|
.Ed
|
|
.Sh ERRORS
|
|
Function
|
|
.Fn elf_memory
|
|
can fail with the following errors:
|
|
.Bl -tag -width "[ELF_E_RESOURCE]"
|
|
.It Bq Er ELF_E_ARGUMENT
|
|
A NULL value was used for argument
|
|
.Ar image
|
|
or the value of argument
|
|
.Ar sz
|
|
was zero.
|
|
.It Bq Er ELF_E_HEADER
|
|
The header of the ELF object contained an unsupported value in its
|
|
.Va e_ident[EI_CLASS]
|
|
field.
|
|
.It Bq Er ELF_E_HEADER
|
|
The header of the ELF object contained an unsupported value in its
|
|
.Va e_ident[EI_DATA]
|
|
field.
|
|
.It Bq Er ELF_E_RESOURCE
|
|
An out of memory condition was detected.
|
|
.It Bq Er ELF_E_SEQUENCE
|
|
Function
|
|
.Fn elf_memory
|
|
was called before a working version was set using
|
|
.Xr elf_version 3 .
|
|
.It Bq Er ELF_E_VERSION
|
|
The argument
|
|
.Ar image
|
|
corresponds to an ELF file with an unsupported version.
|
|
.El
|
|
.Sh SEE ALSO
|
|
.Xr elf 3 ,
|
|
.Xr elf_begin 3 ,
|
|
.Xr elf_end 3 ,
|
|
.Xr elf_errno 3 ,
|
|
.Xr elf_kind 3 ,
|
|
.Xr gelf 3
|