The protocol between the library and the remote spy daemon

The remote spy daemon creates a Unix socket and puts itself in a listening state. On the other side, the library connects itself to the same socket and starts the communication.

A data retreival cycle is made of:

1. A request from the library: (2 unsigned ints)

   Offset	Name	Meaning
   0	magic	Must be RSPYD_MAGIC_NUMBER
   4	last_event_nr	The last event number received (0 to get the first)

2. The response from the remote spy daemon: (header + data)
   • header: (3 unsigned ints)

     Offset	Name	Meaning
     0	magic	Must be RSPYD_MAGIC_NUMBER
     4	event_nr	The event number of the current data (ignore if size==0)
     8	size	The size of the data (0 if no data available)

   • data as present in the circular buffer (size bytes)