StdLib/BsdSocketLib/send.c

   1 /** @file
   2   Implement the send API.
   3
   4   Copyright (c) 2011, Intel Corporation
   5   All rights reserved. This program and the accompanying materials
   6   are licensed and made available under the terms and conditions of the BSD License
   7   which accompanies this distribution.  The full text of the license may be found at
   8   http://opensource.org/licenses/bsd-license.php
   9
  10   THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  11   WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  12
  13 **/
  14
  15 #include <SocketInternals.h>
  16
  17
  18 /**
  19   Send data using a network connection.
  20
  21   The ::send routine queues data to the network for transmission.
  22   The
  23   <a href="http://pubs.opengroup.org/onlinepubs/9699919799/functions/send.html">POSIX</a>
  24   documentation is available online.
  25
  26   @param [in] s         Socket file descriptor returned from ::socket.
  27
  28   @param [in] buffer    Address of a buffer containing the data to send.
  29
  30   @param [in] length    Length of the buffer in bytes.
  31
  32   @param [in] flags     Message control flags
  33
  34   @returns    ::send returns the number of data bytes that were
  35               sent and -1 when an error occurs.  In the case of
  36               an error, errno contains more details.
  37
  38  **/
  39 ssize_t
  40 send (
  41   int s,
  42   CONST void * buffer,
  43   size_t length,
  44   int flags
  45   )
  46 {
  47   ssize_t LengthInBytes;
  48   CONST UINT8 * pData;
  49   struct __filedes * pDescriptor;
  50   EFI_SOCKET_PROTOCOL * pSocketProtocol;
  51   EFI_STATUS Status;
  52
  53   //
  54   //  Assume failure
  55   //
  56   LengthInBytes = -1;
  57
  58   //
  59   //  Locate the context for this socket
  60   //
  61   pSocketProtocol = BslFdToSocketProtocol ( s,
  62                                             &pDescriptor,
  63                                             &errno );
  64   if ( NULL != pSocketProtocol ) {
  65     //
  66     //  Send the data using the socket
  67     //
  68     pData = buffer;
  69     do {
  70       errno = 0;
  71       Status = pSocketProtocol->pfnSend ( pSocketProtocol,
  72                                           flags,
  73                                           length,
  74                                           pData,
  75                                           (size_t *)&LengthInBytes,
  76                                           NULL,
  77                                           0,
  78                                           &errno );
  79       if ( EFI_ERROR ( Status )) {
  80         LengthInBytes = -1;
  81         break;
  82       }
  83
  84       //
  85       //  Account for the data sent
  86       //
  87       pData += LengthInBytes;
  88       length -= LengthInBytes;
  89       // TODO: Add non-blocking check
  90     } while (( 0 != length ) && ( EFI_NOT_READY == Status ));
  91   }
  92
  93   //
  94   //  Return the number of data bytes sent, -1 for errors
  95   //
  96   return (INT32)LengthInBytes;
  97 }