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
156 lines
4.2 KiB
Groff
156 lines
4.2 KiB
Groff
.\" Copyright (c) 2006-2008,2018 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_getscn.3 3639 2018-10-14 14:07:02Z jkoshy $
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.\"
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.Dd September 24, 2018
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.Dt ELF_GETSCN 3
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.Os
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.Sh NAME
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.Nm elf_getscn ,
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.Nm elf_ndxscn ,
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.Nm elf_newscn ,
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.Nm elf_nextscn
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.Nd get/allocate section information for an ELF object
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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_Scn *"
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.Fn elf_getscn "Elf *elf" "size_t index"
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.Ft size_t
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.Fn elf_ndxscn "Elf_Scn *scn"
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.Ft "Elf_Scn *"
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.Fn elf_newscn "Elf *elf"
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.Ft "Elf_Scn *"
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.Fn elf_nextscn "Elf *elf" "Elf_Scn *scn"
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.Sh DESCRIPTION
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These functions are used to iterate through the sections associated
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with an ELF descriptor.
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.Pp
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Function
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.Fn elf_getscn
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will return a section descriptor for the section at index
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.Ar index
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in the object denoted by ELF descriptor
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.Ar elf .
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An error will be signalled if the specified section does not
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exist.
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.Pp
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Function
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.Fn elf_ndxscn
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returns the section table index associated with section descriptor
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.Ar scn .
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.Pp
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Function
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.Fn elf_newscn
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creates a new section and appends it to the list of sections
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associated with descriptor
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.Ar elf .
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The library will automatically increment the
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.Va e_shnum
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field of the ELF header associated with descriptor
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.Ar elf ,
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and will set the
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.Dv ELF_F_DIRTY
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flag on the returned section descriptor.
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For ELF descriptors opened for writing, the ELF library will
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automatically create an empty section at index zero
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.Dv ( SHN_UNDEF )
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on the first call to
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.Fn elf_newscn .
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.Pp
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Function
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.Fn elf_nextscn
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takes a section descriptor
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.Ar scn
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and returns a pointer to the section descriptor at the next higher
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index.
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As a consequence,
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.Fn elf_nextscn
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will never return a pointer to the empty section at index zero
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.Dv ( SHN_UNDEF ) .
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Argument
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.Ar scn
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is allowed to be NULL, in which case this function will return a
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pointer to the section descriptor at index 1.
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If no further sections are present, function
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.Fn elf_nextscn
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will return a NULL pointer.
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.Sh RETURN VALUES
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Functions
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.Fn elf_getscn ,
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.Fn elf_newscn
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and
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.Fn elf_nextscn
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return a valid pointer to a section descriptor if successful, or
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NULL if an error occurs.
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.Pp
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Function
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.Fn elf_ndxscn
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returns a valid section table index if successful, or
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.Dv SHN_UNDEF
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if an error occurs.
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.Sh ERRORS
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These functions may 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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Arguments
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.Ar elf
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or
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.Ar scn
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were NULL.
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.It Bq Er ELF_E_ARGUMENT
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Argument
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.Ar index
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exceeded the current number of sections in the ELF object.
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.It Bq Er ELF_E_ARGUMENT
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Argument
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.Ar elf
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was not a descriptor for an ELF file.
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.It Bq Er ELF_E_ARGUMENT
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Section descriptor
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.Ar scn
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was not associated with ELF descriptor
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.Ar elf .
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.It Bq Er ELF_E_CLASS
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Descriptor
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.Ar elf
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was of an unknown ELF class.
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.It Bq Er ELF_E_SECTION
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Argument
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.Ar elf
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specified extended section numbering in the ELF header with the section header at
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index
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.Dv SHN_UNDEF
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not being of type
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.Dv SHT_NULL .
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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_flagdata 3 ,
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.Xr elf_flagscn 3 ,
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.Xr elf_getdata 3 ,
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.Xr elf_getshdr 3 ,
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.Xr gelf 3
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