Am Montag 12 März 2012, 12:31:27 schrieb Simon Marlow:
On 11/03/2012 01:31, Volker Wysk wrote:
However, I want to use it with stdin, stdout and stderr, only.
Is there some reason you can't just use 0, 1, and 2?
This is complicated. I want to be able to fork a child action, and communicate with it through stdin/stdout. I also want to be able to replace the child with an external program, and communicate with it through a stdout-stdin pipe. Something like this: subproc (outm "Durch die Röhre" -|- exec "/bin/cat" []) I don't rely on stdin/-out/-err still being open. One might be closed, and the file descriptor might be reallocated (for a subsequently opened file or whatever). I also don't rely on stdin being fd 0, stdout being fd 1, stderr being fd 2. If you really want to know what's going on, here is the documentation: http://volker-wysk.de/hsshellscript/apidoc/HsShellScript.html#v%3Aexecute_fi...
These three should never be garbage collected, should they? I think it would be safe to use unsafeWithHandleFd this way. Am I right?
I wouldn't do that, but you're probably right that it is safe right now. (but no guarantees that it will continue to work for ever.)
So I need a fixed unsafeWithHandleFd, for it to work forever? I guess, I'll leave it as it is, for now. Cheers Volker