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annotate src/g23m-fad/tcpip/rnet/rnet_rt/rnet_rt_api_shutdown.c @ 1:d393cd9bb723

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src/g23m-*: initial import from Magnetite
author Mychaela Falconia <falcon@freecalypso.org>
date Sun, 15 Jul 2018 04:40:46 +0000
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d393cd9bb723 src/g23m-*: initial import from Magnetite
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1 /**
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2 * @file rnet_rt_api_shutdown.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_shutdown.c,v 1.3 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 *
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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 * Disables the sending on a socket and informs the peer
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32 * about it.
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33 *
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34 * Subsequent calls to the send function are disallowed.
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35 * For TCP sockets, a FIN will be sent after all data is sent and acknowledged by the receiver.
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36 * The rnet_shutdown function does not frees the connection ID. Any resources attached
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37 * to the ID will not be freed until rnet_close is invoked.
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38 *
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39 * To assure that all data is sent and received on a connection (TCP) before it
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40 * is closed, an application should use rnet_shutdown to close connection before calling
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41 * rnet_close. For example, to initiate a graceful disconnect:
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42 * 1) Call rnet_shutdown.
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43 * 2) When RNET_ERROR_IND with RNET_CONN_CLOSED is received, call rnet_recv until
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44 * the len parameter is zero.
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45 * 3) Call rnet_close.
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46 *
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47 * Following technique describes how to minimize the chance of problems
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48 * occurring during connection teardown. In this example, the client is responsible for
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49 * initiating a graceful shutdown.
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50 *
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51 * Client Side Server Side
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52 * (1) Invoke rnet_shutdown to
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53 * signal end of session and that
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54 * client has no more data to send.
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55 * (2) Receive RNET_ERROR_IND with RNET_CONN_CLOSED,
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56 * indicating graceful shutdown in progress
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57 * and that all data has been received.
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58 * (3) Send any remaining response data with rnet_send.
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59 * (5') Get RNET_RECV_IND and (4) Invoke rnet_shutdown to
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60 * invoke rnet_recv to get any indicate server has no more data to send.
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61 * response data sent by server.
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62 * (5) Receive RNET_ERROR_IND (4') Invoke rnet_close.
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63 * with RNET_CONN_CLOSED.
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64 * (6) Invoke rnet_close.
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65 *
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66 * The timing sequence is maintained from step (1) to step (6) between the client and
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67 * the server, except for step (4') and (5') which only has local timing significance in
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68 * the sense that step (5) follows step (5') on the client side while step (4') follows
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69 * step (4) on the server side, with no timing relationship with the remote party.
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70 *
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71 * @param desc Connection identifier.
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72 * @return RNET_NOT_INITIALIZED NET subsystem not initialized (internal error).
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73 * RNET_INTERNAL_ERR Network subsystem failed.
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74 * RNET_INVALID_PARAMETER The connection ID is invalid.
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75 * The descriptor is not connected (TCP only).
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76 * RNET_NOT_READY Still processing a callback function.
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77 * RNET_OK Connection shutdown, sending impossible
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78 * RNET_ERROR_IND with the parameter RNET_CONN_CLOSED
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79 * will be sent to the peer.
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80 */
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81
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82 T_RNET_RET rnet_rt_shutdown (T_RNET_DESC * desc)
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83 {
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84 int err;
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85
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86 /* stop sending data */
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87 rvf_lock_mutex( &rnet_rt_env_ctrl_blk_p->mutex);
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88 err = ngSAIOShutdown( (NGsock *) desc, 1);
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89 rvf_unlock_mutex( &rnet_rt_env_ctrl_blk_p->mutex);
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90
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91 return( rnet_rt_ngip_error( err));
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92 }
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93
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94 #endif /* ifdef RNET_CFG_REAL_TRANSPORT */
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95