[Haskell-cafe] Setting environment variables on Windows
shahn at cs.tu-berlin.de
Wed Oct 14 18:41:11 EDT 2009
On Wednesday 14 October 2009 04:50:56 pm Sönke Hahn wrote:
> On Friday 09 October 2009 07:19:30 pm Peter Verswyvelen wrote:
> > Mmm, that seems like a shortcoming.
> > Well, you could just wrap the C functions yourself, like this (two
> > possibilities, no error checking yet, quick hack):
> > http://hpaste.org/fastcgi/hpaste.fcgi/view?id=10565#a10565
> > Note that using SetEnvironmentVariable does not seem to be compatible
> > with getEnv, but calling _putenv does work.
> Both solutions seem to work on my system. Using c_putenv doesn't require
> linking additional libraries in my case, so i'm going with that. You've
> been very helpful, thank you very much.
> > So I guess someone should add this setEnv wrapper to the
> > System.Environment module? Ticket?
> Once i figure out, how to implement functions differently for linux and
> windows, i'll write a ticket with an example module based on your
Here's the ticket: http://hackage.haskell.org/trac/ghc/ticket/3587
> Again, many thanks,
> > On Fri, Oct 9, 2009 at 5:37 PM, Sönke Hahn <shahn at cs.tu-berlin.de> wrote:
> > > Hi!
> > >
> > > I need to set an environment variable from Haskell and i would like to
> > > do
> > that
> > > cross-platform. There is System.Posix.Env.setEnv, which does exactly,
> > > what
> > i
> > > want on Linux. There is the module System.Environment, which seems to
> > > be cross-platform, but it does not contain functions to manipulate the
> > > environment (, just to inspect it). At first glance, I didn't find
> > anything
> > > relevant in the sub-modules of System.Win32.
> > >
> > > Is this just not implemented? How could i implement it myself?
> > >
> > > Grateful for any comment,
> > >
> > > Sönke
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