What is the difference between read() and recv()?

What is the difference between read() and recv()? 

  From Andrew Gierth (andrew@erlenstar.demon.co.uk):

  read() is equivalent to recv() with a flags parameter of 0.  Other
  values for the flags parameter change the behaviour of recv().
  Similarly, write() is equivalent to send() with flags == 0.

  It is unlikely that send()/recv() would be dropped; perhaps someone
  with a copy of the POSIX drafts for socket calls can check...

  Portability note: non-unix systems may not allow read()/write() on
  sockets, but recv()/send() are usually ok. This is true on Windows and
  OS/2, for example.

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