[erlang-bugs] Dynamic libraries are not closed on MacOS X [with patch]

Bjorn Gustavsson <>
Wed Sep 24 15:45:44 CEST 2008

2008/9/7 Paul Guyot <>

> Hello,
> On MacOS X, dynamic libraries opened with erl_ddll:load or load_driver are
> not closed when erl_ddll:unload/unload_driver is called.
> Steps to reproduce:
> * build a simple dynamic library, called simple_drv.so
> * start a new erlang shell in the same directory.
> * note down the PID.
> * evaluate erl_ddll:load(".", "simple_drv").
> * run lsof -p <PID> to see that indeed simple_drv.so file is open.
> * evaluate erl_ddll:unload("simple_drv").
> * run lsof -p <PID> to see that simple_drv.so file is still open.
> This is specific to MacOS X and this is simply because the code hasn't been
> written. On other Unix implementations, the erl_ddll code calls dlopen and
> dclose.
> The attached patch against R12B-4 fixes the bug and was tested on MacOS X
> 10.4/ppc.

Thanks for your patch.

It works fine, but we will use the simpler solution of using dlopen() on all



Björn Gustavsson, Erlang/OTP, Ericsson AB
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