wxAppConsole and fork

[Сергей Коныгин]

Hello!

I'm writing a simple linux daemon using wxAppConsole. Linux daemons usually use fork function for creating a child process. Can I use fork in OnInit() function? Is there an another way to create the child process and exit?

[Vadim Zeitlin]

You should be able to use fork(), after all wxExecute() does it (see its
code in src/unix/utilsunx.cpp) and using it in OnInit() works fine, AFAIK.

Or you could also use wxIMPLEMENT_APP_NO_MAIN() and provide your own
main() which would fork first, before calling wxEntry() from the branch
which needs to use wx. Read the documentation of wxDISABLE_DEBUG_SUPPORT()
macro if you do this.

Regards,
VZ

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[Сергей Коныгин]

Thanks, it works!

One more question: how can I made my own MainLoop in wxMyAppConsole that process events and constantly calls a some function like DoStep. My server must work with the socket and at the same time do some iterations of calculation. A new thread is not good idea.

суббота, 22 июня 2024 г. в 18:09:12 UTC+4, Vadim Zeitlin:

[Vadim Zeitlin]

On Sun, 23 Jun 2024 12:40:10 -0700 (PDT) Сергей Коныгин wrote:

> One more question: how can I made my own MainLoop in wxMyAppConsole that
> process events and constantly calls a some function like DoStep.

You can use wxConsoleEventLoop in console applications and it allows you
to register sockets with it under Unix. It's not obvious it's a good idea
if you're writing something very Unix-specific, however.

[Gunter Königsmann]

As a side note: since the arrival of systemd I had the impression that daemons tend to no more automatically fork to the background: this way it is easier to see if a daemon stops and needs to be restarted.

[Сергей Коныгин]

Can I use a console application without fork as a daemon under systemd?

понедельник, 24 июня 2024 г. в 08:51:56 UTC+4, Gunter Königsmann:

[Christian Kristukat]

Have a look at wxTimer

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