FreeCalypso > hg > fc-magnetite
annotate src/g23m-fad/tcpip/rnet/rnet_rt/rnet_rt_api_recv.c @ 331:8166b0afcf8c
FCHG: main ADC process implemented
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Thu, 14 Dec 2017 16:22:30 +0000 |
parents | 90eb61ecd093 |
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rev | line source |
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1 /** |
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2 * @file rnet_rt_api_recv.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_recv.c,v 1.4 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 * 3/22/2002 Regis Feneon Create |
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19 * 6/24/2002 Regis Feneon check NG_IO_TRUNC flag |
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20 * (C) Copyright 2002 by TI, All Rights Reserved |
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21 * |
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22 */ |
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23 |
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24 #include "rnet_cfg.h" |
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25 #ifdef RNET_CFG_REAL_TRANSPORT |
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26 |
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27 #include "rnet_rt_i.h" |
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28 #include "rnet_rt_env.h" |
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29 |
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30 |
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31 |
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32 /** |
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33 * Read the waiting data (not-blocking). |
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34 * |
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35 * Data reception is message based: When the application receives a |
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36 * T_RNET_RECV_IND message, it can read the data with this |
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37 * rnet_recv() function. |
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38 * |
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39 * The data are copied in the buffer given by the application to RNET |
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40 * via this rnet_recv function. |
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41 * |
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42 * Datagram oriented (UDP) |
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43 * ----------------------- |
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44 * When an UDP datagram arrives, the receiver application receives |
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45 * a T_RNET_RECV_IND message. The application can then read the |
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46 * datagram with the rnet_recv function. The buffer passed to the |
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47 * function should be big enough to contain a UDP datagram, otherwise |
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48 * the message is not put in the buffer and the error code |
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49 * RNET_MSG_SIZE is returned. |
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50 * |
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51 * The OUT value of the len_p parameter can have two possible values: |
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52 * - If there was data to read and no error detected (function |
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53 * returned RNET_OK), len_p contains the size of the received datagram. |
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54 * - If there was no error, but no data to read, len_p contains 0. |
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55 * |
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56 * RNET will only send a new T_RNET_RECV_IND with a specific descriptor |
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57 * when a rnet_recv function has been called that returned a len_p parameter |
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58 * with a 0 value. Therefore, the application should loop on rnet_recv when |
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59 * it receives a T_RNET_RECV_IND message, like: |
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60 * UINT16 *len_p = -1; |
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61 * while (*len_p != 0) { |
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62 * ret = rnet_recv(desc, buff, len_p); |
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63 * ... |
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64 * } |
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65 * |
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66 * Stream oriented (TCP) |
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67 * --------------------- |
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68 * When a new stream of data arrives on a connection, the receiver |
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69 * application receives a T_RNET_RECV_IND. It can then read the flow |
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70 * with the rnet_recv function, until the len_p parameter is returned |
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71 * with a 0 value. |
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72 * |
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73 * The stack will only send a new T_RNET_RECV_IND message when |
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74 * rnet_recv has been called and has returned the len_p parameter with a 0. |
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75 * |
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76 * |
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77 * @param desc Connection identifier [IN]. |
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78 * @param buff Buffer to store the received data [OUT]. |
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79 * @param len_p Pointer on the length of the passed buffer [IN] |
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80 * Pointer on the size of the received data in the buffer [OUT]. |
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81 * @return RNET_MEMORY_ERR Not enough memory is available |
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82 * RNET_NOT_INITIALIZED NET subsystem not initialized (internal error). |
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83 * RNET_INTERNAL_ERR Network subsystem failed. |
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84 * RNET_NOT_READY Still processing a callback function. |
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85 * RNET_INVALID_PARAMETER The connection ID is invalid. |
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86 * or The ID is not connected. |
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87 * or Invalid buff parameter. |
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88 * or Connection not bound with bind. |
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89 * RNET_CONN_ABORTED Connection broken due to the "keep-alive" activity |
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90 * detecting a failure while the operation was in progress. |
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91 * or Virtual circuit terminated due to a time-out or other failure. |
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92 * RNET_MSG_SIZE The socket is message oriented (UDP), and the message |
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93 * was too large to fit into the specified buffer and was truncated. |
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94 * RNET_CONN_RESET The virtual circuit was reset by the remote side executing a "hard" |
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95 * or "abortive" close. |
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96 * RNET_TIMEOUT The connection has been dropped, because of a |
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97 * network failure or because the system on the other end went down |
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98 * without notice. |
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99 * RNET_NET_UNREACHABLE Remote host cannot be reached from this host at this time. |
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100 * RNET_OK Data successfully read. |
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101 */ |
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102 |
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103 T_RNET_RET rnet_rt_recv (T_RNET_DESC * desc, |
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104 T_RVF_BUFFER *buff, |
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105 UINT16 * len_p) |
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106 { |
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107 int ret, rflags; |
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108 |
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109 rflags = 0; |
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110 /* For GPF TCPIP we do not need the mutex calls, because the entity is |
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111 * single threaded and the functions are not called from other entities. |
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112 */ |
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113 /* rvf_lock_mutex( &rnet_rt_env_ctrl_blk_p->mutex); */ |
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114 ret = ngSAIORecv( (NGsock *) desc, buff, *len_p, &rflags, NULL, NULL); |
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115 if( ret == NG_EWOULDBLOCK) { |
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116 /* no more data to read, will send T_RNET_RECV_IND message */ |
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117 /* when new data will be received */ |
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118 ((T_RNET_RT_SOCK *) desc)->flags |= RNET_RT_SOCKF_NOTIFY_RECV; |
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119 ret = 0; |
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120 } |
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121 /* |
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122 else if( ret == 0) { |
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123 ret = NG_ECONNRESET; |
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124 } |
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125 */ |
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126 /* rvf_unlock_mutex( &rnet_rt_env_ctrl_blk_p->mutex); */ |
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127 |
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128 if( ret >= 0) { |
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129 *len_p = ret; |
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130 /* check if message was truncated */ |
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131 return( (rflags & NG_IO_TRUNC) ? RNET_MSG_SIZE : RNET_OK); |
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132 } |
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133 |
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134 return( rnet_rt_ngip_error( ret)); |
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135 } |
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136 |
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137 #endif /* ifdef RNET_CFG_REAL_TRANSPORT */ |
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138 |