1 /** @file 2 Implement the read 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 Read support routine for sockets 20 21 The BslSocketRead routine is called indirectly by the read file 22 system routine. This routine is typically used for SOCK_STREAM 23 because it waits for receive data from the target system specified 24 in the ::connect call. 25 26 @param [in] pDescriptor Descriptor address for the file 27 @param [in] pOffset File offset 28 @param [in] LengthInBytes Number of bytes to read 29 @param [in] pBuffer Address of the buffer to receive the data 30 31 @return The number of bytes read or -1 if an error occurs. 32 In the case of an error, ::errno contains more details. 33 34 **/ 35 ssize_t 36 EFIAPI 37 BslSocketRead ( 38 struct __filedes *pDescriptor, 39 off_t * pOffset, 40 size_t LengthInBytes, 41 void * pBuffer 42 ) 43 { 44 ssize_t BytesRead; 45 46 // 47 // Receive the data from the remote system 48 // 49 BytesRead = recvfrom ( pDescriptor->MyFD, 50 pBuffer, 51 LengthInBytes, 52 0, 53 NULL, 54 NULL ); 55 56 // 57 // Return the number of bytes read 58 // 59 return BytesRead; 60 } 61
