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-.\" Copyright (c) 2006,2008,2010-2011 Joseph Koshy.  All rights reserved.
-.\"
-.\" Redistribution and use in source and binary forms, with or without
-.\" modification, are permitted provided that the following conditions
-.\" are met:
-.\" 1. Redistributions of source code must retain the above copyright
-.\"    notice, this list of conditions and the following disclaimer.
-.\" 2. Redistributions in binary form must reproduce the above copyright
-.\"    notice, this list of conditions and the following disclaimer in the
-.\"    documentation and/or other materials provided with the distribution.
-.\"
-.\" This software is provided by Joseph Koshy ``as is'' and
-.\" any express or implied warranties, including, but not limited to, the
-.\" implied warranties of merchantability and fitness for a particular purpose
-.\" are disclaimed.  in no event shall Joseph Koshy be liable
-.\" for any direct, indirect, incidental, special, exemplary, or consequential
-.\" damages (including, but not limited to, procurement of substitute goods
-.\" or services; loss of use, data, or profits; or business interruption)
-.\" however caused and on any theory of liability, whether in contract, strict
-.\" liability, or tort (including negligence or otherwise) arising in any way
-.\" out of the use of this software, even if advised of the possibility of
-.\" such damage.
-.\"
-.\" $Id: elf_getdata.3 1766 2011-08-22 06:01:03Z jkoshy $
-.\"
-.Dd January 26, 2011
-.Os
-.Dt ELF_GETDATA 3
-.Sh NAME
-.Nm elf_getdata ,
-.Nm elf_newdata ,
-.Nm elf_rawdata
-.Nd iterate through or allocate section data
-.Sh LIBRARY
-.Lb libelf
-.Sh SYNOPSIS
-.In libelf.h
-.Ft "Elf_Data *"
-.Fn elf_getdata "Elf_Scn *scn" "Elf_Data *data"
-.Ft "Elf_Data *"
-.Fn elf_newdata "Elf_Scn *scn"
-.Ft "Elf_Data *"
-.Fn elf_rawdata "Elf_Scn *scn" "Elf_Data *data"
-.Sh DESCRIPTION
-These functions are used to access and manipulate data descriptors
-associated with section descriptors.
-Data descriptors used by the ELF library are described in
-.Xr elf 3 .
-.Pp
-Function
-.Fn elf_getdata
-will return the next data descriptor associated with section descriptor
-.Ar scn .
-The returned data descriptor will be setup to contain translated data.
-Argument
-.Ar data
-may be NULL, in which case the function returns the first data descriptor
-associated with section
-.Ar scn .
-If argument
-.Ar data
-is not NULL, it must be a pointer to a data descriptor associated with
-section descriptor
-.Ar scn ,
-and function
-.Fn elf_getdata
-will return a pointer to the next data descriptor for the section,
-or NULL when the end of the section's descriptor list is reached.
-.Pp
-Function
-.Fn elf_newdata
-will allocate a new data descriptor and append it to the list of data
-descriptors associated with section descriptor
-.Ar scn .
-The new data descriptor will be initialized as follows:
-.Bl -tag -width "d_version" -compact -offset indent
-.It Va d_align
-Set to 1.
-.It Va d_buf
-Initialized to NULL.
-.It Va d_off
-Set to (off_t) -1.
-This field is under application control if the
-.Dv ELF_F_LAYOUT
-flag was set on the ELF descriptor.
-.It Va d_size
-Set to zero.
-.It Va d_type
-Initialized to
-.Dv ELF_T_BYTE .
-.It Va d_version
-Set to the current working version of the library, as set by
-.Xr elf_version 3 .
-.El
-The application must set these values as appropriate before
-calling
-.Xr elf_update 3 .
-Section
-.Ar scn
-must be associated with an ELF file opened for writing.
-If the application has not requested full control of layout by
-setting the
-.Dv ELF_F_LAYOUT
-flag on descriptor
-.Ar elf ,
-then the data referenced by the returned descriptor will be positioned
-after the existing content of the section, honoring the file alignment
-specified in member
-.Va d_align .
-On successful completion of a call to
-.Fn elf_newdata ,
-the ELF library will mark the section
-.Ar scn
-as
-.Dq dirty .
-.Pp
-Function
-.Fn elf_rawdata
-is used to step through the data descriptors associated with
-section
-.Ar scn .
-In contrast to function
-.Fn elf_getdata ,
-this function returns untranslated data.
-If argument
-.Ar data
-is NULL, the first data descriptor associated with section
-.Ar scn
-is returned.
-If argument
-.Ar data
-is not NULL, is must be a data descriptor associated with
-section
-.Ar scn ,
-and function
-.Fn elf_rawdata
-will return the next data descriptor in the list, or NULL
-if no further descriptors are present.
-Function
-.Fn elf_rawdata
-always returns
-.Vt Elf_Data
-structures of type
-.Dv ELF_T_BYTE .
-.Ss Special handling of zero-sized and SHT_NOBITS sections
-For sections of type
-.Dv SHT_NOBITS,
-and for zero-sized sections,
-the functions
-.Fn elf_getdata
-and
-.Fn elf_rawdata
-return a pointer to a valid
-.Vt Elf_Data
-structure that has its
-.Va d_buf
-member set to NULL and its
-.Va d_size
-member set to the size of the section.
-.Pp
-If an application wishes to create a section of type
-.Dv SHT_NOBITS ,
-it should add a data buffer to the section using function
-.Fn elf_newdata .
-It should then set the
-.Va d_buf
-and
-.Va d_size
-members of the returned
-.Vt Elf_Data
-structure to NULL and the desired size of the section respectively.
-.Sh RETURN VALUES
-These functions return a valid pointer to a data descriptor if successful, or
-NULL if an error occurs.
-.Sh ERRORS
-These functions may fail with the following errors:
-.Bl -tag -width "[ELF_E_RESOURCE]" 
-.It Bq Er ELF_E_ARGUMENT
-Either of the arguments
-.Ar scn
-or
-.Ar data
-was NULL.
-.It Bq Er ELF_E_ARGUMENT
-The data descriptor referenced by argument
-.Ar data
-is not associated with section descriptor
-.Ar scn .
-.It Bq Er ELF_E_ARGUMENT
-The section denoted by argument
-.Ar scn
-had no data associated with it.
-.It Bq Er ELF_E_DATA
-Retrieval of data from the underlying object failed.
-.It Bq Er ELF_E_RESOURCE
-An out of memory condition was detected.
-.It Bq Er ELF_E_SECTION
-Section
-.Ar scn
-had type
-.Dv SHT_NULL .
-.It Bq Er ELF_E_SECTION
-The type of the section
-.Ar scn
-was not recognized by the library.
-.It Bq Er ELF_E_SECTION
-The size of the section
-.Ar scn
-is not a multiple of the file size for its section type.
-.It Bq Er ELF_E_SECTION
-The file offset for section
-.Ar scn
-is incorrect.
-.It Bq Er ELF_E_UNIMPL
-The section type associated with section
-.Ar scn
-is currently unsupported by the library.
-.El
-.Sh SEE ALSO
-.Xr elf 3 ,
-.Xr elf_flagdata 3 ,
-.Xr elf_flagscn 3 ,
-.Xr elf_getscn 3 ,
-.Xr elf_getshdr 3 ,
-.Xr elf_newscn 3 ,
-.Xr elf_rawfile 3 ,
-.Xr elf_update 3 ,
-.Xr elf_version 3 ,
-.Xr gelf 3