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Event handling functions
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int
CNET_set_handler(CnetEvent ev, void (*func)(), CnetData data)
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Register func as the void ``returning'' function to be invoked
when the event ev occurs.
Possible errors: ER_BADEVENT, ER_NOTSUPPORTED.
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int
CNET_get_handler(CnetEvent ev, void (**handler)(), CnetData *data)
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Obtains the address of the void ``returning'' function which
will be invoked when the indicated event occurs, together with the
user-specified data value that will be passed to the handler.
Possible errors: ER_BADEVENT, ER_NOTSUPPORTED.
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