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$Id: dwarf_attr.3 3644 2018-10-15 19:55:01Z jkoshy $
.Dd April 8, 2010 .Dt DWARF_ATTR 3 .Os .Sh NAME .Nm dwarf_attr .Nd retrieve an attribute descriptor associated with a DWARF debugging information entry .Sh LIBRARY .Lb libdwarf .Sh SYNOPSIS n libdwarf.h .Ft int .Fo dwarf_attr .Fa "Dwarf_Die die" .Fa "Dwarf_Half attr" .Fa "Dwarf_Attribute *atp" .Fa "Dwarf_Error *err" .Fc .Sh DESCRIPTION Function .Fn dwarf_attr retrieves the attribute descriptor for an attribute associated with the DWARF debugging information entry descriptor in argument .Ar die .
p DWARF attribute descriptors are represented by value of the opaque type .Vt Dwarf_Attribute , see .Xr dwarf 3 .
p Argument .Ar attr names the desired DWARF attribute. Legal values for argument .Ar attr are those denoted by the .Dv DW_AT_* constants in the DWARF specification.
p Argument .Ar atp points to a location into which the returned attribute descriptor will be written. The returned descriptor may then be passed to the form query functions in the .Xr dwarf 3 API set to access the data associated with the attribute.
p If argument .Ar err is non-NULL, it will be used to return an error descriptor in case of an error. .Sh RETURN VALUES Function .Fn dwarf_attr returns .Dv DW_DLV_OK on success.
p If the debugging information entry descriptor denoted by argument .Ar die does not contain the named attribute, the function returns .Dv DW_DLV_NO_ENTRY and sets argument .Ar err . For other errors, it returns .Dv DW_DLV_ERROR and sets argument .Ar err . .Sh ERRORS Function .Fn dwarf_attr can fail with the following errors: l -tag -width ".Bq Er DW_DLE_ARGUMENT" t Bq Er DW_DLE_ARGUMENT Either of arguments .Ar die or .Ar atp was NULL. t Bq Er DW_DLE_NO_ENTRY Argument .Ar die had no attribute corresponding to the value in argument .Ar attr . .El .Sh SEE ALSO .Xr dwarf 3 , .Xr dwarf_attrlist 3 , .Xr dwarf_attroffset 3 , .Xr dwarf_hasattr 3 , .Xr dwarf_hasform 3 , .Xr dwarf_whatattr 3 , .Xr dwarf_whatform 3