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 August 15, 2006
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.Os
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2006-11-13 09:46:16 +00:00
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.Dt ELF_GETARSYM 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_getarsym
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.Nd retrieve the symbol table of an archive
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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_Arsym *"
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.Fn elf_getarsym "Elf *elf" "size_t *ptr"
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.Sh DESCRIPTION
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The function
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.Fn elf_getarsym
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retrieves the symbol table for an
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.Xr ar 1
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archive, if one is available.
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.Pp
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Argument
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.Ar elf
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should be a descriptor for an
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.Xr ar 1
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archive opened using
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.Fn elf_begin
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or
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.Fn elf_memory .
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.Pp
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If the archive
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.Ar elf
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contains a symbol table with n entries, this function returns a
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pointer to an array of n+1
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.Vt Elf_Arsym
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structures.
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An
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.Vt Elf_Arsym
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structure has the following elements:
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.Bl -tag -width indent -compact
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.It Vt "char *" Va as_name
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This structure member is a pointer to a null-terminated symbol name.
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.It Vt "off_t" Va as_off
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This structure member contains the byte offset from the beginning of the archive to
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the header for the archive member.
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This value is suitable for use with
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.Xr elf_rand 3 .
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.It Vt "unsigned long" Va as_hash
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This structure member contains a portable hash value for the symbol
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name, as computed by
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.Xr elf_hash 3 .
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.El
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.Pp
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The last entry of the returned array will have a NULL value for member
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.Va as_name ,
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a zero value for member
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.Va as_off
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and an illegal value of ~0UL for
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.Va as_hash .
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.Pp
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If argument
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.Ar ptr
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is non-null, the
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.Fn elf_getarsym
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function will store the number of table entries returned (including the
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sentinel entry at the end) into the location it points to.
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.Sh RETURN VALUES
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Function
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.Fn elf_getarsym
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returns a pointer to an array of
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.Vt Elf_Arsym
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structures if successful, or a NULL
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pointer if an error was encountered.
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.Pp
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If argument
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.Ar ptr
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is non-null and there was no error, the library will store the
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number of archive symbol entries returned into the location it
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points to.
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If argument
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.Ar ptr
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is non-null and an error was encountered, the library will
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set the location pointed to by it to zero.
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.Sh ERRORS
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Function
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.Fn elf_getarsym
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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
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.Xr ar 1
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archive.
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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_getarhdr 3 ,
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.Xr elf_hash 3 ,
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.Xr elf_memory 3 ,
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.Xr elf_next 3 ,
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.Xr elf_rand 3
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