Bug fix: Exit code with LispWorks 7
By having :process always be a stream on LispWorks 7, we make sure that the process can be killed, have its vital signs checked, and its PID obtained. In a simple and consistent manner. With LispWorks 7, pid-exit-status is no longer available. We need a stream to obtain the exit status. With save-exit-status, we can be sure that we're given one.
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