patchPOSIXUserMaskWork  117 signalwrappers.cpp   patchPOSIXUserMaskWork(how, set, oldset, &checkpointSignalBlockedForProcess);
patchPOSIXUserMaskWork  123 signalwrappers.cpp   patchPOSIXUserMaskWork(how, set, oldset, &checkpointSignalBlockedForThread);