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$Id$

A document to describe which APIs a backend should implement.


Each backend should implement:

Functions:

 - handle-condition
 - socket-connect
 - socket-listen
 - get-hosts-by-name [ optional ]
 - get-host-by-address [ optional ]

 - wait-for-input-internal (new in 0.4.x)

Methods:

 - socket-close
 - socket-accept
 - get-local-name
 - get-peer-name

 and - for ip sockets - these methods:

 - get-local-address
 - get-local-port
 - get-peer-address
 - get-peer-port


An error-handling function, resolving implementation specific errors
to this list of errors:

 - address-in-use-error
 - address-not-available-error
 - bad-file-descriptor-error
 - connection-refused-error
 - invalid-argument-error
 - no-buffers-error
 - operation-not-supported-error
 - operation-not-permitted-error
 - protocol-not-supported-error
 - socket-type-not-supported-error
 - network-unreachable-error
 - network-down-error
 - network-reset-error
 - host-down-error
 - host-unreachable-error
 - shutdown-error
 - timeout-error
 - unkown-error

and these conditions:

 - interrupted-condition
 - unkown-condition
