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IABSD.fr/src/lib/libelf/gelf_getdyn.3
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- lib/libelf/gelf_getdyn.3
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.\" Copyright (c) 2006,2008 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: gelf_getdyn.3,v 1.2 2020/05/18 06:46:23 jsg Exp $ .\" .Dd April 22, 2019 .Dt GELF_GETDYN 3 .Os .Sh NAME .Nm gelf_getdyn , .Nm gelf_update_dyn .Nd read and update ELF dynamic entries .Sh LIBRARY .Lb libelf .Sh SYNOPSIS .In gelf.h .Ft "GElf_Dyn *" .Fn gelf_getdyn "Elf_Data *data" "int ndx" "GElf_Dyn *dyn" .Ft int .Fn gelf_update_dyn "Elf_Data *data" "int ndx" "GElf_Dyn *dyn" .Sh DESCRIPTION These convenience functions are used to retrieve and update class-dependent .Vt Elf32_Dyn or .Vt Elf64_Dyn information in the .Sy dynamic table of an ELF object. .Pp Argument .Ar data is an .Vt Elf_Data descriptor associated with a section of type .Dv SHT_DYNAMIC . Argument .Ar ndx is the index of the entry being retrieved or updated. The class-independent .Vt GElf_Dyn structure is described in .Xr gelf 3 . .Pp Function .Fn gelf_getdyn retrieves the class-dependent entry at index .Ar ndx in data buffer .Ar data and copies it to the destination pointed to by argument .Ar dyn after translation to class-independent form. .Pp Function .Fn gelf_update_dyn converts the class-independent entry pointed to by argument .Ar dyn to class-dependent form, and writes it to the entry at index .Ar ndx in the data buffer described by argument .Ar data . Function .Fn gelf_update_dyn signals an error if any of the values in the class-independent representation exceeds the representable limits of the target type. .Sh RETURN VALUES Function .Fn gelf_getdyn returns the value of argument .Ar dyn if successful, or NULL in case of an error. Function .Fn gelf_update_dyn returns a non-zero value if successful, or zero in case of an error. .Sh ERRORS These functions may fail with the following errors: .Bl -tag -width "[ELF_E_RESOURCE]" .It Bq Er ELF_E_ARGUMENT Arguments .Ar data or .Ar dyn were NULL. .It Bq Er ELF_E_ARGUMENT Argument .Ar ndx was less than zero or larger than the number of entries in the data descriptor. .It Bq Er ELF_E_ARGUMENT Data descriptor .Ar data was not associated with a section of type .Dv SHT_DYNAMIC . .It Bq Er ELF_E_RANGE A value was not representable in the target type. .It Bq Er ELF_E_VERSION The .Vt Elf_Data descriptor denoted by argument .Ar data is associated with an ELF object with an unsupported version. .El .El .Sh SEE ALSO .Xr elf 3 , .Xr elf_getdata 3 , .Xr elf_getscn 3 , .Xr gelf 3