Signal set struct wrapping the C sigset_t and its setter / getter functions.
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Posix functions for masking & unmasking signals.
Masked signals will not be noted but will not fire. If a signal occurs one or more times while masked, when it is unmasked it will fire immediately. Signals are not queued, so if a signal fires multiple times while masked, it will only fire once upon unmasking.
The list of posix signals is defined in ocean.stdc.posix.signal
Build flags: -debug=SignalMask: prints debugging information to Stderr