Call to Runtime.unloadLibrary corrupts stdout and stderr

rikki cattermole via Digitalmars-d digitalmars-d at
Sat Sep 2 21:49:00 PDT 2017

On 02/09/2017 10:38 PM, Markus Pursche wrote:
> Hi, I'm trying to hot reload a DLL while the program is running to allow 
> for rapid iteration in a game engine I am working on. I started reading 
> up on how DLLs work between D code here: 
> I followed that example, however when I try to do the following I crash:
> 1. Load DLL
> 2. Unload DLL
> 3. Load DLL again
> The problem I am getting is a Bad File Descriptor exception right after 
> step 2, on my very next writeln to be exact.
> Here is the exception I am getting:
> I spent a couple of hours trying to debug it, googling all sorts of 
> combinations of "dlang unloadlibrary bad file descriptor", until I got 
> the idea to try "dlang freelibrary bad file descriptor" and found this 
> old bug report from 2004:
> This sounds absolutely spot on to the problems I am having. I tried to 
> save stdout and reset it after unloading my library but I still crashed 
> on the next writeln, does anyone have an idea for a workaround on this?
> I'm hoping that someone like Walter or Andrei will see this and decide 
> that it's time for this 2004 issue to finally die. :P

*sigh* 2018H1 plan I am listing shared library support.
Even better still, I will argue it as the ONLY language/druntime feature 
we need in it!

Seriously, this is the biggest thing holding back D atm.

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