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* signal.cc (_SA_NORESTART): New flag. (sigaction_worker): New function, derived from sigaction. Don't set internal flags unless called internally. (sigaction): Use sigaction_worker. (signal): Honor new _SA_NORESTART flag. (siginterrupt): Set _SA_NORESTART flag appropriately. Use sigaction_worker to set flags. * include/cygwin/signal.h: Define _SA_INTERNAL_MASK here.
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