Process A fork()s process B.
Process A dies and therefore init adopts B.
A watchdog creates process C.
Is it somehow possible for C to adopt B from init?
Update:
Or would it even be possible to have C adopt B directly (when A dies), if C were created prior to A's dead, without init becoming an intermediate parent of B?
Update-1:
Also I would appreciate any comments on why having the possiblity to adopt a process the way I described would be a bad thing or difficult to impossible to implement.
Update-2 - The use case (parent and children refer to process(es)):
I have an app using a parent to manage a whole bunch of children, which rely on the parent's managment facility. To do its job the parent relies on being notified by a child's termination, which is done via receiving the related SIGCHLD signal.
If the parent itself dies due some accident (including segfaulting) I need to restart the whole "family", as it's impossible now to trigger something on a child's termination (which also might due to a segfault).
In such a case I need to bring down all children and do a full system's restart.
A possible approach to avoid this situation, would be to have a spare-process in place which could take over the dead parent's role ... - if it could again receive the step children's SIGCHLD signals!