Haiku OS has some useful functions that other OSs could really borrow!

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iscomputeron int32 iscomputeron(void) Returns 1 if the computer is on. If the computer isn’t on, the value returned by this function is undefined. iscomputeronfire) double iscomputeronfire(void) Returns the temperature of the motherboard if the computer is currently on fire. Smoldering doesn’t count. If the computer isn’t on fire, the function returns some other value. ProdrammerHumor.io