120 lines
3.3 KiB
Groff
120 lines
3.3 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 July 6, 2006
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.Os
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.Dt ELF 3
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.Sh NAME
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.Nm elf32_getehdr ,
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.Nm elf64_getehdr ,
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.Nm gelf_getehdr
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.Nd retrieve the object file header
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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_Ehdr *"
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.Fn elf32_getehdr "Elf *elf"
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.Ft "Elf64_Ehdr *"
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.Fn elf64_getehdr "Elf *elf"
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.In gelf.h
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.Ft "Gelf_Ehdr *"
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.Fn gelf_getehdr "Elf *elf" "Gelf_Ehdr *dst"
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.Sh DESCRIPTION
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These functions retrieve the ELF object file
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header from the ELF descriptor
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.Ar elf
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and return a translated header descriptor to their callers.
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.Pp
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Functions
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.Fn elf32_getehdr
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and
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.Fn elf64_getehdr
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return a pointer to the appropriate class-specific header descriptor
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if it exists in the file referenced by descriptor
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.Ar elf .
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These functions return
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.Dv NULL
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if an ELF header was not found in file
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.Ar elf .
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.Pp
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Function
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.Fn gelf_getehdr
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stores a translated copy of the header for ELF file
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.Ar elf
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into the descriptor pointed to by argument
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.Ar dst .
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It returns argument
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.Ar dst
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if successful or
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.Dv NULL
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in case of failure.
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.Sh RETURN VALUES
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These functions return a pointer to a translated header descriptor
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if successful, or NULL on failure.
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.Sh ERRORS
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These functions 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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The 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 file.
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.It Bq Er ELF_E_ARGUMENT
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The elf class of descriptor
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.Ar elf
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was not recognized.
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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_CLASS
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The ELF class of descriptor
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.Ar elf
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did not match that of the API 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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does not have an associated header.
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.It Bq Er ELF_E_RESOURCE
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An out of memory condition was detected during execution.
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.It Bq Er ELF_E_VERSION
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The ELF descriptor
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.Ar elf
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had an unsupported ELF version number.
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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_getident 3 ,
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.Xr elf_flagehdr 3 ,
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.Xr elf32_newehdr 3 ,
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.Xr elf64_newehdr 3 ,
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.Xr gelf 3 ,
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.Xr gelf_newehdr 3 ,
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.Xr elf 5
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