Commit ee109a91 authored by Committed by Olivier Crête
agent: Rearchitect message handling to use GErrors for EWOULDBLOCK
Previously, an EWOULDBLOCK return value from the low-level socket calls (including PseudoTcpSocket) would be represented by a zero number of bytes (or messages) read by the agent. This conflicts with the use of zero to represent end of stream (EOS) for pseudo-TCP connections, where the sender has indicated that they are not going to send any more bytes. So, now use GError (G_IO_ERROR_WOULD_BLOCK) to represent EWOULDBLOCK, just like the GSocket functions. Zero is reserved exclusively for if: • the number of requested bytes/messages is zero; or • reliable mode is enabled and EOS is reached. This does change the documented behaviour of the NiceAgent send/recv API, but only by allowing a new behaviour (returning zero) rather than by changing an existing one, so it should be OK.
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