1.\" $NetBSD: dwarf_hasattr.3,v 1.6 2024/03/03 17:37:31 christos Exp $ 2.\" 3.\" Copyright (c) 2010 Kai Wang 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_hasattr.3 3963 2022-03-12 16:07:32Z jkoshy 28.\" 29.Dd April 17, 2010 30.Dt DWARF_HASATTR 3 31.Os 32.Sh NAME 33.Nm dwarf_hasattr 34.Nd check for the presence of an attribute 35.Sh LIBRARY 36.Lb libdwarf 37.Sh SYNOPSIS 38.In libdwarf.h 39.Ft int 40.Fo dwarf_hasattr 41.Fa "Dwarf_Die die" 42.Fa "Dwarf_Half attr" 43.Fa "Dwarf_Bool *ret_bool" 44.Fa "Dwarf_Error *err" 45.Fc 46.Sh DESCRIPTION 47Function 48.Fn dwarf_hasattr 49tests whether the debugging information entry referenced in argument 50.Fa die 51contains the attribute named by argument 52.Fa attr . 53Legal values for argument 54.Fa attr 55are those denoted by the 56.Dv DW_AT_* 57constants in the DWARF specification. 58.Pp 59If the named attribute is present in the debugging information entry, 60function 61.Fn dwarf_hasattr 62returns a non-zero value in the location pointed to by argument 63.Fa ret_bool . 64If the named attribute is not present, a zero is written instead. 65.Pp 66If argument 67.Fa err 68is not 69.Dv NULL , 70it will be used to return an error descriptor in case of an error. 71.Sh RETURN VALUES 72On success, function 73.Fn dwarf_hasattr 74returns 75.Dv DW_DLV_OK . 76In case of an error, it returns 77.Dv DW_DLV_ERROR 78and sets argument 79.Fa err . 80.Sh ERRORS 81Function 82.Fn dwarf_hasattr 83can fail with the following error: 84.Bl -tag -width ".Bq Er DW_DLE_ARGUMENT" 85.It Bq Er DW_DLE_ARGUMENT 86Either of argument 87.Va die 88or 89.Va ret_bool 90was 91.Dv NULL . 92.El 93.Sh SEE ALSO 94.Xr dwarf 3 , 95.Xr dwarf_attr 3 , 96.Xr dwarf_whatattr 3 97