Approaches of interprocess communication

[Steve Holden]

Ben Finney wrote:
> "Gabriel Genellina" <gagsl-py at yahoo.com.ar> writes:
> 
>> (And I would expect that making a connection to "localhost" actually
>> does *not* go down up to the network card hardware layer, but I
>> don't know for real if this is the case or not).
> 
> It damned well better. That's the entire point of the loopback
> interface: to get all the network layer code involved, but not to talk
> on a physical network interface.
> 
> If a programmer decides on behalf of the user that "localhost" should
> be treated specially, that programmer is making an error.
> 
Inter-process TCP/IP communication between two processes on the same 
host invariably uses the loopback interface (network 127.0.0.0). 
According to standards, all addresses in that network space refer to the 
local host, though 127.0.0.1 is conventionally used.

The transmit driver for the loopback interface receives a datagram from 
the local network layer and immediately announces its reception back to 
the local network layer.

regards
  Steve
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