(libc.info.gz) Receiving Data

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 16.9.5.2 Receiving Data
 .......................
 
 The 'recv' function is declared in the header file 'sys/socket.h'.  If
 your FLAGS argument is zero, you can just as well use 'read' instead of
 'recv'; see  I/O Primitives.
 
  -- Function: ssize_t recv (int SOCKET, void *BUFFER, size_t SIZE, int
           FLAGS)
      Preliminary: | MT-Safe | AS-Safe | AC-Safe |  POSIX Safety
      Concepts.
 
      The 'recv' function is like 'read', but with the additional flags
      FLAGS.  The possible values of FLAGS are described in  Socket
      Data Options.
 
      If nonblocking mode is set for SOCKET, and no data are available to
      be read, 'recv' fails immediately rather than waiting.   File
      Status Flags, for information about nonblocking mode.
 
      This function returns the number of bytes received, or '-1' on
      failure.  The following 'errno' error conditions are defined for
      this function:
 
      'EBADF'
           The SOCKET argument is not a valid file descriptor.
 
      'ENOTSOCK'
           The descriptor SOCKET is not a socket.
 
      'EWOULDBLOCK'
           Nonblocking mode has been set on the socket, and the read
           operation would block.  (Normally, 'recv' blocks until there
           is input available to be read.)
 
      'EINTR'
           The operation was interrupted by a signal before any data was
           read.   Interrupted Primitives.
 
      'ENOTCONN'
           You never connected this socket.
 
      This function is defined as a cancellation point in multi-threaded
      programs, so one has to be prepared for this and make sure that
      allocated resources (like memory, files descriptors, semaphores or
      whatever) are freed even if the thread is canceled.
 

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(libc.info.gz) Sending Data

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(libc.info.gz) Socket Data Options