How to detect when stdout is closed?

[Jörg Sommer <joerg@xxxxxxxxxxxx>]

Hi,

I run a script with open_process(), but my _jed_quit_hooks isn't run
everytime and due to this some spawned process remain. I use jed-script
for this processes. How can I detect when stdout or stdin is closed? This
way the client can quit itself, when Jed doesn't send him a signal
before.

In pure SLang I found signal() and I think I could watch out for SIGHUP,
but jed-script has not signal().

Bye, Jörg.
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