Glib Main Loop Query

[Sumit Kumar Jain <sumitskj_20 yahoo com>]

Hello All,
  I have one quey about the function g_main_context_add_poll function.  Once we add a file descriptor to be polled and if file descriptor is  ready, how do we call a callback function for it. What i mean to say is  if we use g_main_context_add_poll, where and how do we set the  prepare,check and dispatch( to call the call back function) for that  fd. When i use a source attached to a context, i can specify the same  using g_source_new  and g_source_set_callback.
  
  Thanks to all in advance.
  
  Regards,
  Sumit Kumar Jain

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