pub type VirtualTimeoutExitHook = fn(u64);Expand description
What a process does with a --virtual-timeout bound, in virtual
nanoseconds, just before the scheduler exits it with 124 because no
TerminalOutcomeUnwind took the outcome. The status is all that
crosses the process boundary, and 124 is every deadline’s status, so a
parent that forked the process learns of the virtual timeout through this
hook instead.