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GSource callback




The documentation for Glib function g_source_set_callback () tells this:
"The exact type of func depends on the type of source; ie. you should not count on func being called with data as its first parameter."
What does it exactly mean? The callback function has the type:
gboolean (*GSourceFunc) (gpointer user_data);

So what should I expect as a parameter when glib calls my callback function with a gpointer data. How can I find my data?
-- 
Regards
Krzysztof J.
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