* Routines to manipulate sigset_t, fltset_t, or sysset_t. These routines * are provided as equivalents for the macros prfillset, * premptyset, praddset, and prdelset. These functions are preferable * because they are not macros which rely on using sizeof (*sp), and thus * can be used to create common code to manipulate event sets. The set * size must be passed explicitly, e.
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