1.\" Copyright (c) 2010 Kai Wang 2.\" All rights reserved. 3.\" 4.\" Redistribution and use in source and binary forms, with or without 5.\" modification, are permitted provided that the following conditions 6.\" are met: 7.\" 1. Redistributions of source code must retain the above copyright 8.\" notice, this list of conditions and the following disclaimer. 9.\" 2. Redistributions in binary form must reproduce the above copyright 10.\" notice, this list of conditions and the following disclaimer in the 11.\" documentation and/or other materials provided with the distribution. 12.\" 13.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 14.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 15.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 16.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 17.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 18.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 19.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 20.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 21.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 22.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 23.\" SUCH DAMAGE. 24.\" 25.\" $Id: dwarf_hasattr.3 2073 2011-10-27 03:30:47Z jkoshy $ 26.\" 27.Dd April 17, 2010 28.Os 29.Dt DWARF_HASATTR 3 30.Sh NAME 31.Nm dwarf_hasattr 32.Nd check for the presence of an attribute 33.Sh LIBRARY 34.Lb libdwarf 35.Sh SYNOPSIS 36.In libdwarf.h 37.Ft int 38.Fo dwarf_hasattr 39.Fa "Dwarf_Die die" 40.Fa "Dwarf_Half attr" 41.Fa "Dwarf_Bool *ret_bool" 42.Fa "Dwarf_Error *err" 43.Fc 44.Sh DESCRIPTION 45Function 46.Fn dwarf_hasattr 47tests whether the debugging information entry referenced in argument 48.Ar die 49contains the attribute named by argument 50.Ar attr . 51Legal values for argument 52.Ar attr 53are those denoted by the 54.Dv DW_AT_* 55constants in the DWARF specification. 56.Pp 57If the named attribute is present in the debugging information entry, 58function 59.Fn dwarf_hasattr 60returns a non-zero value in the location pointed to by argument 61.Ar ret_bool . 62If the named attribute is not present, a zero is written instead. 63.Pp 64If argument 65.Ar err 66is not NULL, it will be used to return an error descriptor in case 67of an error. 68.Sh RETURN VALUES 69On success, function 70.Fn dwarf_hasattr 71returns 72.Dv DW_DLV_OK . 73In case of an error, it returns 74.Dv DW_DLV_ERROR 75and sets argument 76.Ar err . 77.Sh ERRORS 78Function 79.Fn dwarf_hasattr 80can fail with the following error: 81.Bl -tag -width ".Bq Er DW_DLE_ARGUMENT" 82.It Bq Er DW_DLE_ARGUMENT 83Either of argument 84.Va die 85or 86.Va ret_bool 87was NULL. 88.Sh SEE ALSO 89.Xr dwarf 3 , 90.Xr dwarf_attr 3 , 91.Xr dwarf_whatattr 3 92