Prctl

PR_SET_PDEATHSIG Binds a Child Notification to Parent Thread Exit

PR_SET_PDEATHSIG Binds a Child Notification to Parent Thread Exit PR_SET_PDEATHSIG lets a Linux process request a signal when the thread that created it terminates. The mechanism is narrow: it is a kernel-delivered notification tied to a parental relationship, not a general process-lifetime contract and not a guarantee that two processes terminate together. That distinction matters in supervisors, launchers, and helper processes. A child can react to loss of its creator without polling a PID, but the exact parent identity, setup timing, inheritance rules, and credential transitions define where the mechanism stops.