The daemon created by the client should survive if the client is interrupted using Ctrl+C

[gnodet]

The JVM has a bad habit (for our use case) to still own child processes.
This means that when the JVM receives an interrupt signal, it will forward it to child processes.
The means that if the client creates a daemon receives a SIGINT, the daemon won't be able to survive.
The daemon needs to call setsid in order to detach. The jansi library would be a good candidate for this function since it already contains a bunch of posix functions.

[ppalaga]

Is this the case only when the daemon is started from mvnd.sh - i.e. from a stock JVM? I am asking because the daemon seems to survive when I interrupt the mvnd native client with CTRL+C.

[ppalaga]

the daemon seems to survive when I interrupt the mvnd native client with CTRL+C.

Plz. forget what I said. The daemon is killed indeed.

[gnodet]

Actually, a more simple way may be to simply have the daemon ignore the INT and TSTP signals, it would avoid any additional JNI requirement.