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* change sigset_t functions to restrict to _NSIGRich Felker2013-08-091-2/+2
| | | | | | | the idea here is to avoid advertising signals that don't exist and to make these functions safe to call (e.g. from within other parts of the implementation) on fake sigset_t objects which do not have the HURD padding.
* implement gnu sigisemptysetRich Felker2011-09-121-0/+9