The other_func message handler
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In general, you should avoid using this member. This member, if non-NULL, represents a routine that will get called with the current message received by the resource manager library when it doesn't recognize the message.
While you could use this to implement private
or
custom
messages, this practice is discouraged (use either the
_IO_DEVCTL or _IO_MSG handlers; see below).
If you wish to handle pulses that come in, use the
pulse_attach() function instead.
You should therefore leave this member with the value NULL.
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