1.\" $NetBSD: dwarf_formblock.3,v 1.6 2024/03/03 17:37:31 christos Exp $ 2.\" 3.\" Copyright (c) 2010 Joseph Koshy 4.\" All rights reserved. 5.\" 6.\" Redistribution and use in source and binary forms, with or without 7.\" modification, are permitted provided that the following conditions 8.\" are met: 9.\" 1. Redistributions of source code must retain the above copyright 10.\" notice, this list of conditions and the following disclaimer. 11.\" 2. Redistributions in binary form must reproduce the above copyright 12.\" notice, this list of conditions and the following disclaimer in the 13.\" documentation and/or other materials provided with the distribution. 14.\" 15.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 16.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 19.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 21.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25.\" SUCH DAMAGE. 26.\" 27.\" Id: dwarf_formblock.3 3962 2022-03-12 15:56:10Z jkoshy 28.\" 29.Dd July 23, 2010 30.Dt DWARF_FORMBLOCK 3 31.Os 32.Sh NAME 33.Nm dwarf_formblock 34.Nd return the value of a BLOCK attribute 35.Sh LIBRARY 36.Lb libdwarf 37.Sh SYNOPSIS 38.In libdwarf.h 39.Ft int 40.Fo dwarf_formblock 41.Fa "Dwarf_Attribute attr" 42.Fa "Dwarf_Block **ret" 43.Fa "Dwarf_Error *err" 44.Fc 45.Sh DESCRIPTION 46Function 47.Fn dwarf_formblock 48sets the location pointed to by argument 49.Fa ret 50to a pointer to a 51.Vt Dwarf_Block 52structure containing the value of the attribute referenced 53by argument 54.Fa attr . 55The form of argument 56.Fa attr 57must be one of 58.Dv DW_FORM_block , 59.Dv DW_FORM_block1 , 60.Dv DW_FORM_block2 61or 62.Dv DW_FORM_block4 . 63.Pp 64If argument 65.Fa err 66is not 67.Dv NULL , 68it will be used to return an error descriptor in case of an error. 69.Ss Memory Management 70The memory area referenced by the returned pointer is managed by 71the DWARF(3) library. 72The application should not attempt to free this memory 73area. 74Portable code may indicate that the memory area is to be freed by 75using 76.Xr dwarf_dealloc 3 . 77.Sh RETURN VALUES 78Function 79.Fn dwarf_formblock 80returns 81.Dv DW_DLV_OK 82on success. 83In case of an error, it returns 84.Dv DW_DLV_ERROR 85and sets argument 86.Fa err . 87.Sh ERRORS 88Function 89.Fn dwarf_formblock 90may fail with the following errors: 91.Bl -tag -width ".Bq Er DW_DLE_ATTR_FORM_BAD" 92.It Bq Er DW_DLE_ARGUMENT 93Either of arguments 94.Fa attr 95or 96.Fa ret 97was 98.Dv NULL . 99.It Bq Er DW_DLE_ATTR_FORM_BAD 100The attribute referenced by argument 101.Fa attr 102was not of a permitted kind. 103.El 104.Sh SEE ALSO 105.Xr dwarf 3 , 106.Xr dwarf_attr 3 , 107.Xr dwarf_formflag 3 , 108.Xr dwarf_formref 3 , 109.Xr dwarf_formsdata 3 , 110.Xr dwarf_formsig8 3 , 111.Xr dwarf_formstring 3 , 112.Xr dwarf_formudata 3 , 113.Xr dwarf_hasattr 3 114