Using clone()
to fork a process you can specify the signal a child process should send its parent on death instead the “normal” SIGCHLD
.
Is it possible to change the set termination signal after the child was created? Either by the child or the parent?
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Answer
I (quickly) scanned Linux’ source for assignments to struct task_struct
‘s member exit_signal
. This seems only to happen in case of reparenting, in which case there are some more checks if the set signal is sane, e.g. that init won’t receive a SIGKILL.
That means the signal cannot be changed at runtime, most likely for security considerations.