142 lines
3.9 KiB
Groff
142 lines
3.9 KiB
Groff
.\" 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 December 16, 2006
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.Os
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.Dt GELF_GETPHDR 3
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.Sh NAME
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.Nm elf32_getphdr ,
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.Nm elf64_getphdr ,
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.Nm gelf_getphdr
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.Nd retrieve an ELF program header table
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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 "Elf32_Phdr *"
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.Fn elf32_getphdr "Elf *elf"
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.Ft "Elf64_Phdr *"
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.Fn elf64_getphdr "Elf *elf"
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.In gelf.h
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.Ft "GElf_Phdr *"
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.Fn gelf_getphdr "Elf *elf" "int index" "GElf_Phdr *dst"
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.Sh DESCRIPTION
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These functions retrieve and translate ELF program header information
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from an ELF descriptor, if this information exists.
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.Pp
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Functions
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.Fn elf32_getphdr
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and
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.Fn elf64_getphdr
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return a pointer to an array of translated
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.Vt Elf32_Phdr
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and
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.Vt Elf64_Phdr
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descriptors respectively.
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These descriptors are described in
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.Xr elf 5 .
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The number of entries in this array is specified by the
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.Va e_phnum
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field of the executable header for ELF descriptor
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.Ar elf .
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.Pp
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Function
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.Fn gelf_getphdr
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will retrieve the program header table entry at index
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.Ar index
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from ELF descriptor
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.Ar elf.
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The translated program header table entry will be written to the
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address pointed to be argument
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.Ar dst .
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.Pp
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Applications may inform the library of modifications to a program header table entry
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by using the
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.Xr elf_flagphdr 3
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API.
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Applications using the
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.Xr gelf 3
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interface need to use the
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.Xr gelf_update_phdr 3
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API to copy modifications to a program header entry back to the underlying
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ELF descriptor.
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.Sh RETURN VALUES
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The functions a valid pointer if successful, or NULL in case an error
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was encountered.
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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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Argument
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.Ar elf
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was NULL.
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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 object.
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.It Bq Er ELF_E_ARGUMENT
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Argument
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.Ar dst
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was NULL.
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.It Bq Er ELF_E_ARGUMENT
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Index
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.Ar index
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was out of range.
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.It Bq Er ELF_E_CLASS
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The class of ELF descriptor
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.Ar elf
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did not match the expected class of the function being called.
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.It Bq Er ELF_E_HEADER
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ELF descriptor
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.Ar elf
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did not possess an executable header.
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.It Bq Er ELF_E_HEADER
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ELF descriptor
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.Ar elf
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had a corrupt executable header.
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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_SECTION
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The ELF descriptor in argument
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.Ar elf
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did not adhere to the conventions used for extended numbering.
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.It Bq Er ELF_VERSION
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ELF descriptor
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.Ar elf
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was of 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 elf32_getehdr 3 ,
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.Xr elf32_newphdr 3 ,
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.Xr elf64_getehdr 3 ,
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.Xr elf64_newphdr 3 ,
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.Xr elf_flagphdr 3 ,
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.Xr gelf 3 ,
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.Xr gelf_getehdr 3 ,
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.Xr gelf_newphdr 3 ,
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.Xr gelf_update_phdr 3 ,
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.Xr elf 5
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