[fpc-pascal] TProcess and zombie processes in *nix systems
mailinglists at geldenhuys.co.uk
Tue Jan 21 21:40:43 CET 2020
In fgGUI applications I often launch other applications. eg: The help
viewer etc. In such cases, I simply want to launch the application and
then forget about it. I have no need to read any stdout etc.
I've been using TProcess for this task as follows:
p := TProcess.Create(nil);
p.Executable := ...
As TProcess is a TComponent descendant, I specify nil as the Owner, thus
I manually free it. It was brought to my attention that if the user has
a long running application (eg: an RSS feed reader - lunching a web
browser via TProcess), after a while they have many Zombie processes in
Linux hanging around until the fpGUI application terminates.
1. The way I create the TProcess. Why or how does it have
a dependency on the fpGUI application?
2. Anybody else experience this zombie processes hanging
around in *nix systems? Is there any option in TProcess
to prevent that?
ie: I want to launch a new application in a separate OS process and then
forget about it.
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