liboop: oop_sys_source()

## oop_sys_source()

    #include <oop.h>

    /* Get the source interface for a system event source. */
    oop_source *oop_sys_source(oop_source_sys *sys);

### Arguments.

oop_source_sys *sys
  The event source from which to fetch the interface.

### Description.

This function returns the standard oop_source interface for the system event source sys. The interface structure returned contains function pointers for registering and unregistering callbacks with the event source; you can pass it to modules which simply want an event source, without needing to know that you use the system event source in particular.

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