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LaunchDoesntCodeandClaude Opus 5.5
1bc029da6d
An ITIMER_REAL or alarm expiry while SIGALRM is blocked is marked on the pending set of sigtimedwait instead of throwing, as kern_psignal leaves a blocked signal pending. sigwait, sigwaitinfo and sigtimedwait take it, repeated expiries merge into one pending signal, and unblocking it runs a guest handler on the unblocking thread or, with the default disposition, exits the process with status 142 as FreeBSD's default action does. The expiry rechecks the mask after marking the signal, so an unblock that races it does not leave SIGALRM pending while unblocked, and TakePending clears the bit with the value it read so one signal is taken once. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>