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annotate src/g23m-fad/tcpip/rnet/rnet_rt/rnet_rt_api_getbufsize.c @ 174:90eb61ecd093

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src/g23m-fad: initial import from TCS3.2/LoCosto
author Mychaela Falconia <falcon@freecalypso.org>
date Wed, 12 Oct 2016 05:40:46 +0000
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1 /**
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2 * @file rnet_rt_api_getbufsize.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_getbufsize.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 * Use to determine the amount of data pending in the network's input buffer
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32 * that can be read from the connection ID.
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33 *
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34 * If desc is stream oriented (TCP), returns the amount of data that can be read
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35 * in a single call to the rnet_recv function; this might not be the same as the
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36 * total amount of data queued on the socket.
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37 * If desc is message oriented (UDP), returns the size of the first datagram
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38 * (message) queued on the socket.
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39 *
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40 * Use the socket option SO_NREAD.
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41 *
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42 * @param desc Connection identifier [IN].
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43 * @param size_p Pointer to an unsigned int in which the result is stored [OUT].
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44 * @return RNET_NOT_INITIALIZED NET subsystem not initialized (internal error).
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45 * RNET_INTERNAL_ERR Network subsystem failed.
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46 * RNET_INVALID_PARAMETER The connection ID is invalid.
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47 * RNET_NOT_READY Still processing a callback function.
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48 * RNET_OK Value successfully get.
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49 */
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50
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51 T_RNET_RET rnet_rt_get_buff_size (T_RNET_DESC * desc,
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52 UINT32 * size_p)
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53 {
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54 int err, len, nread;
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55
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56 len = sizeof( nread);
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57
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58 /* get number of bytes in receive buffer */
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59 rvf_lock_mutex( &rnet_rt_env_ctrl_blk_p->mutex);
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60 err = ngSAIOGetOption( (NGsock *) desc, NG_IOCTL_SOCKET, NG_SO_NREAD,
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61 &nread, &len);
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62 rvf_unlock_mutex( &rnet_rt_env_ctrl_blk_p->mutex);
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63
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64 if( err == NG_EOK) {
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65 *size_p = nread;
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66 return( RNET_OK);
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67 }
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68
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69 return( rnet_rt_ngip_error( err));
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70 }
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71
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72 #endif /* ifdef RNET_CFG_REAL_TRANSPORT */
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73