Re: [Haskell-cafe] Replacing stdin from within Haskell

Quoth Erik Hesselink ,

On Thu, Jun 9, 2011 at 13:40, Neil Davies wrote:

...

Anyone out there got an elegant solution to being able to fork a haskell thread and replace its 'stdin' ?

If you don't mind being tied to GHC you can use hDuplicateTo from GHC.IO.Handle [1]. You can also use dupTo from the unix package [2], but that ties you to unix-like platforms instead.

From reading about it, I would expect hDuplicate to to close and replace the input file descriptor for _all_ threads.

Processes are of course the elegant way to separate effects like this. Donn