&tip; ''データ(とIPAddress, Port番号)を取得''
''int'' ''&color(Maroon){recvfrom};'' ''(''
  ''int'' s,
  ''char *'' buf,
  ''int'' len,
  ''int'' flags,
  ''struct sockaddr *'' from,
  ''int *'' fromlen
'');''
----

''s''
-[in] Descriptor identifying a bound socket.

''buf''
-[out] Buffer for the incoming data.

''len''
-[in] Length of buf, in bytes.

''flags''
-[in] Indicator specifying the way in which the call is made.

''from''
-[out] Optional pointer to a buffer in a sockaddr structure that will hold the source address upon return.

''fromlen''
-[in, out] Optional pointer to the size, in bytes, of the from buffer.