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annotate src/g23m-fad/tcpip/rnet/rnet_rt/rnet_rt_api_recvfrom.c @ 221:e2dce971aec9

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doc/C139-Howto: update for the current status
author Mychaela Falconia <falcon@freecalypso.org>
date Sun, 16 Oct 2016 00:01:13 +0000
parents 90eb61ecd093
children
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1 /**
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2 * @file rnet_rt_api_recvfrom.c
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3 *
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4 * RNET_RT API
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5 *
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6 * @author Regis Feneon
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7 * @version 0.1
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8 */
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9
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10 /*
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11 * $Id: rnet_rt_api_recvfrom.c,v 1.2 2002/10/30 15:23:34 rf Exp $
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12 * $Name: ti_20021030 $
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13 *
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14 * History:
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15 *
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16 * Date Author Modification
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17 * --------------------------------------------------
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18 * 6/24/2002 Regis Feneon Create
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19 *
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20 */
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21 #include "rnet_cfg.h"
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22 #ifdef RNET_CFG_REAL_TRANSPORT
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23
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24 #include "rnet_rt_i.h"
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25 #include "rnet_rt_env.h"
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26
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27
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28 /**
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29 * Read the waiting data (not-blocking).
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30 *
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31 * Data reception is message based: When the application receives a
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32 * T_RNET_RECV_IND message, it can read the data with this
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33 * rnet_recv() function.
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34 *
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35 * The data are copied in the buffer given by the application to RNET
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36 * via this rnet_recv function.
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37 *
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38 * Datagram oriented (UDP)
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39 * -----------------------
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40 * When an UDP datagram arrives, the receiver application receives
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41 * a T_RNET_RECV_IND message. The application can then read the
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42 * datagram with the rnet_recv function. The buffer passed to the
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43 * function should be big enough to contain a UDP datagram, otherwise
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44 * the message is not put in the buffer and the error code
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45 * RNET_MSG_SIZE is returned.
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46 *
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47 * The OUT value of the len_p parameter can have two possible values:
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48 * - If there was data to read and no error detected (function
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49 * returned RNET_OK), len_p contains the size of the received datagram.
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50 * - If there was no error, but no data to read, len_p contains 0.
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51 *
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52 * RNET will only send a new T_RNET_RECV_IND with a specific descriptor
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53 * when a rnet_recv function has been called that returned a len_p parameter
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54 * with a 0 value. Therefore, the application should loop on rnet_recv when
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55 * it receives a T_RNET_RECV_IND message, like:
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56 * UINT16 *len_p = -1;
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57 * while (*len_p != 0) {
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58 * ret = rnet_recv(desc, buff, len_p);
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59 * ...
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60 * }
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61 *
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62 * Stream oriented (TCP)
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63 * ---------------------
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64 * When a new stream of data arrives on a connection, the receiver
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65 * application receives a T_RNET_RECV_IND. It can then read the flow
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66 * with the rnet_recv function, until the len_p parameter is returned
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67 * with a 0 value.
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68 *
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69 * The stack will only send a new T_RNET_RECV_IND message when
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70 * rnet_recv has been called and has returned the len_p parameter with a 0.
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71 *
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72 *
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73 * @param desc Connection identifier [IN].
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74 * @param buff Buffer to store the received data [OUT].
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75 * @param len_p Pointer on the length of the passed buffer [IN]
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76 * Pointer on the size of the received data in the buffer [OUT].
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77 * @return RNET_MEMORY_ERR Not enough memory is available
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78 * RNET_NOT_INITIALIZED NET subsystem not initialized (internal error).
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79 * RNET_INTERNAL_ERR Network subsystem failed.
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80 * RNET_NOT_READY Still processing a callback function.
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81 * RNET_INVALID_PARAMETER The connection ID is invalid.
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82 * or The ID is not connected.
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83 * or Invalid buff parameter.
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84 * or Connection not bound with bind.
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85 * RNET_CONN_ABORTED Connection broken due to the "keep-alive" activity
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86 * detecting a failure while the operation was in progress.
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87 * or Virtual circuit terminated due to a time-out or other failure.
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88 * RNET_MSG_SIZE The socket is message oriented (UDP), and the message
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89 * was too large to fit into the specified buffer and was truncated.
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90 * RNET_CONN_RESET The virtual circuit was reset by the remote side executing a "hard"
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91 * or "abortive" close.
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92 * RNET_TIMEOUT The connection has been dropped, because of a
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93 * network failure or because the system on the other end went down
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94 * without notice.
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95 * RNET_NET_UNREACHABLE Remote host cannot be reached from this host at this time.
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96 * RNET_OK Data successfully read.
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97 */
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98
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99 T_RNET_RET rnet_rt_recv_from (T_RNET_DESC * desc,
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100 T_RVF_BUFFER * buff,
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101 UINT16 * len_p,
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102 T_RNET_IP_ADDR * from_addr,
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103 T_RNET_PORT * from_port)
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104 {
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105 int ret, rflags;
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106 NGsockaddr faddr;
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107
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108 rflags = 0;
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109 rvf_lock_mutex( &rnet_rt_env_ctrl_blk_p->mutex);
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110 ret = ngSAIORecv( (NGsock *) desc, buff, *len_p, &rflags, &faddr, NULL);
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111 if( ret == NG_EWOULDBLOCK) {
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112 /* no more data to read, will send T_RNET_RECV_IND message */
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113 /* when new data will be received */
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114 ((T_RNET_RT_SOCK *) desc)->flags |= RNET_RT_SOCKF_NOTIFY_RECV;
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115 ret = 0;
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116 }
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117 rvf_unlock_mutex( &rnet_rt_env_ctrl_blk_p->mutex);
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118
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119 if( ret >= 0) {
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120 /* return nb of read bytes */
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121 *len_p = ret;
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122 /* return source address and port number */
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123 *from_addr = ngNTOHL( faddr.sin_addr);
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124 *from_port = ngNTOHS( faddr.sin_port);
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125 /* check if message was truncated */
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126 return( (rflags & NG_IO_TRUNC) ? RNET_MSG_SIZE : RNET_OK);
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127 }
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128
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129 return( rnet_rt_ngip_error( ret));
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130 }
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131
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132 #endif /* ifdef RNET_CFG_REAL_TRANSPORT */
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133