2006-11-11 17:16:35 +00:00
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.\" Copyright (c) 2006 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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.\" $FreeBSD$
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.\"
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.Dd June 28, 2006
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.Os
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2006-11-13 09:46:16 +00:00
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.Dt ELF_MEMORY 3
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2006-11-11 17:16:35 +00:00
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.Sh NAME
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.Nm elf_memory
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.Nd process an ELF or ar(1) archive mapped into memory
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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_memory "char *image" "size_t size"
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.Sh DESCRIPTION
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Function
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.Fn elf_memory
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is used to process an ELF file or
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.Xr ar 1
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archive whose image is present in memory.
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.Pp
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Argument
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.Ar image
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points to the start of the memory image of the file or archive.
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Argument
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.Ar size
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contains the size in bytes of the memory image.
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.Pp
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The ELF descriptor is created for reading (i.e., analogous to the
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use of
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.Xr elf_begin 3
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with a command argument value of
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.Dv ELF_C_READ Ns ).
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.Sh RETURN VALUES
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Function
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.Fn elf_memory
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returns a pointer to a new ELF descriptor if successful, or NULL if an
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error occurred.
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.Pp
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The return value may be queried for the file type using
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.Xr elf_kind 3 .
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.Sh EXAMPLES
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To read parse an elf file, use:
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.Bd -literal -offset indent
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int fd;
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void *p;
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struct stat sb;
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Elf *e;
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\&...
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if ((fd = open("./elf-file", O_RDONLY)) < 0 ||
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fstat(fd, &sb) < 0 ||
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(p = mmap(NULL, sb.st_size, PROT_READ, MAP_PRIVATE, fd, (off_t) 0)) ==
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MAP_FAILED) {
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... handle system error ...
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}
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if ((e = elf_memory(p, sb.st_size)) == NULL) {
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... handle elf(3) error ...
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}
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\&... use ELF descriptor "e" here ...
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.Ed
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.Sh ERRORS
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Function
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.Fn elf_memory
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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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A NULL value was used for argument
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.Ar image
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or the value of argument
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.Ar sz
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was zero.
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.It Bq Er ELF_E_HEADER
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The header of the ELF object contained an unsupported value in its
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.Va e_ident[EI_CLASS]
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field.
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.It Bq Er ELF_E_HEADER
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The header of the ELF object contained an unsupported value in its
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.Va e_ident[EI_DATA]
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field.
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.It Bq Er ELF_E_RESOURCE
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An out of memory condition was detected.
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.It Bq Er ELF_E_SEQUENCE
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Function
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.Fn elf_memory
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was called before a working version was set using
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.Xr elf_version 3 .
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.It Bq Er ELF_E_VERSION
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The argument
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.Ar image
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corresponds to an ELF file with an unsupported version.
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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_end 3 ,
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.Xr elf_error 3 ,
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.Xr elf_kind 3 ,
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.Xr gelf 3
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