Is it safe to call getProcessExitCode more than once?

David Brown haskell at
Thu Oct 28 01:13:23 EDT 2004

On Thu, Oct 28, 2004 at 06:27:42AM +0200, Peter Simons wrote:
> Glynn Clements writes:
>  > Both [waitForProcess and getProcessExitCode] will throw
>  > an exception if the process terminated on a signal.
> So if I terminate a process manually, I'll have to wait for
> the ExitCode to avoid a zombie process, and waiting for the
> ExitCode invariably throws an exception.

It's just the way that Unix process management works.  I guess you have to
catch the exception to handle it well.  This is part of the aspect that
makes writing shells so complicated.


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