1.\" $NetBSD: dwarf_hasattr.3,v 1.2 2014/03/09 16:58:04 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 2073 2011-10-27 03:30:47Z jkoshy 28.\" 29.Dd April 17, 2010 30.Os 31.Dt DWARF_HASATTR 3 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.Ar die 51contains the attribute named by argument 52.Ar attr . 53Legal values for argument 54.Ar 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.Ar ret_bool . 64If the named attribute is not present, a zero is written instead. 65.Pp 66If argument 67.Ar err 68is not NULL, it will be used to return an error descriptor in case 69of an error. 70.Sh RETURN VALUES 71On success, function 72.Fn dwarf_hasattr 73returns 74.Dv DW_DLV_OK . 75In case of an error, it returns 76.Dv DW_DLV_ERROR 77and sets argument 78.Ar err . 79.Sh ERRORS 80Function 81.Fn dwarf_hasattr 82can fail with the following error: 83.Bl -tag -width ".Bq Er DW_DLE_ARGUMENT" 84.It Bq Er DW_DLE_ARGUMENT 85Either of argument 86.Va die 87or 88.Va ret_bool 89was NULL. 90.Sh SEE ALSO 91.Xr dwarf 3 , 92.Xr dwarf_attr 3 , 93.Xr dwarf_whatattr 3 94