[fpc-pascal] TProcess and zombie processes in *nix systems
Hi, 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); try p.Executable := ... p.Execute; finally p.free end; 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. Two things: 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. Regards, Graeme ___ fpc-pascal maillist - fpc-pascal@lists.freepascal.org https://lists.freepascal.org/cgi-bin/mailman/listinfo/fpc-pascal
Re: [fpc-pascal] TProcess and zombie processes in *nix systems
Op 2020-01-21 om 21:40 schreef Graeme Geldenhuys: ie: I want to launch a new application in a separate OS process and then forget about it. This is the responsibility of the callee I think, to daemonize and cut the cord so to speak. ___ fpc-pascal maillist - fpc-pascal@lists.freepascal.org https://lists.freepascal.org/cgi-bin/mailman/listinfo/fpc-pascal
Re: [fpc-pascal] TProcess and zombie processes in *nix systems
On Tue, Jan 21, 2020 at 9:41 PM Graeme Geldenhuys wrote: > 2. Anybody else experience this zombie processes hanging > around in *nix systems? Is there any option in TProcess > to prevent that? https://bugs.freepascal.org/view.php?id=11797 -- Bart ___ fpc-pascal maillist - fpc-pascal@lists.freepascal.org https://lists.freepascal.org/cgi-bin/mailman/listinfo/fpc-pascal
Re: [fpc-pascal] TProcess and zombie processes in *nix systems
Am 21.01.2020 um 22:04 schrieb Marco van de Voort: Op 2020-01-21 om 21:40 schreef Graeme Geldenhuys: ie: I want to launch a new application in a separate OS process and then forget about it. This is the responsibility of the callee I think, to daemonize and cut the cord so to speak. Indeed, doesn't seem to be that easy: https://stackoverflow.com/questions/27361227/how-to-prevent-creation-of-zombie-processes-while-using-fork-and-exec-in-lin Regards, Sven ___ fpc-pascal maillist - fpc-pascal@lists.freepascal.org https://lists.freepascal.org/cgi-bin/mailman/listinfo/fpc-pascal
