ae500c1ff8
Highlights: - Make sure that only TLS sections are sorted into TLS segment. - Fixed multiple errors in "Section to Segment mapping". - Man page updates - ar improvements - elfcopy: avoid filter_reloc uninitialized variable for rela - elfcopy: avoid stripping relocations from static binaries - readelf: avoid printing directory in front of absolute path - readelf: add NT_FREEBSD_FEATURE_CTL FreeBSD note type - test improvements NOTES: Some of these changes originated in FreeBSD and simply reduce diffs between contrib and vendor. ELF Tool Chain ar is not (currently) used in FreeBSD, and there are improvements in both FreeBSD and ELF Tool Chain ar that are not in the other. Sponsored by: The FreeBSD Foundation
123 lines
3.5 KiB
Groff
123 lines
3.5 KiB
Groff
.\" Copyright (c) 2006,2008 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_memory.3 3639 2018-10-14 14:07:02Z jkoshy $
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.\"
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.Dd June 28, 2006
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.Dt ELF_MEMORY 3
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.Os
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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 ELF object referenced by argument
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.Ar image
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was of an unsupported ELF 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_errno 3 ,
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.Xr elf_kind 3 ,
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.Xr gelf 3
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