Functions attached with FFI::Struct.by_value as a return value are returning
null pointers
------------------------------------------------------------------------------------------
Key: JRUBY-4769
URL: http://jira.codehaus.org/browse/JRUBY-4769
Project: JRuby
Issue Type: Bug
Components: Extensions
Affects Versions: JRuby 1.5.0.RC2
Environment: Linux i386
Reporter: Justin Collins
Thought I'd test my [FFI gdbm|http://github.com/presidentbeef/ffi-gdbm] library
against 1.5.0rc2.
This is the struct class I use:
{noformat} class Datum < FFI::Struct
layout :dptr, :pointer, :dsize, :int
#Expects either a MemoryPointer or a String as an argument.
#If it is given a String, it will initialize the fields, including
#setting dsize.
def initialize(*args)
if args.length == 0 or (args.length == 1 and args[0].is_a?
FFI::MemoryPointer)
super
elsif args.length == 1 and args[0].is_a? String
super()
self.dptr = args[0]
self[:dsize] = args[0].length
end
end
def value
if self[:dptr].nil? or self[:dptr].null?
nil
else
self[:dptr].read_string(self.size)
end
end
def dptr=(str)
@dptr = FFI::MemoryPointer.from_string(str)
self[:dptr] = @dptr
end
def size
self[:dsize]
end
end
{noformat}
And these are the functions which are returning structs with null pointers for
:dptr
{noformat} attach_function :gdbm_fetch, [ :pointer, Datum.by_value ],
Datum.by_value
attach_function :gdbm_firstkey, [ :pointer ], Datum.by_value
attach_function :gdbm_nextkey, [ :pointer, Datum.by_value ], Datum.by_value
{noformat}
These functions work properly with 1.4.0, as well as MRI 1.8.7p72 and 1.9.1p243
with FFI 0.6.3.
Please let me know what further info I can provide to narrow down this issue.
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