From mboxrd@z Thu Jan  1 00:00:00 1970
From: ronkhu <ronkhu@ntsp.nec.co.jp>
Subject: Re: another socket connection question
Date: Thu, 03 Jul 2003 11:45:19 +0800
Sender: linux-c-programming-owner@vger.kernel.org
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( after successful connection)how about  making the client wait
for a certain u-can-now-send-me-requests message
from the server before proceeding in sending requests?

Lejanson C. Go wrote:

>
>             Client                       Server
>               .                             .
>               .                             .
>               .    retry connect until      .
>               o---------------------------->.
>               .         success             .
>               .                             .
>               .<----------------------------o
>               .                             .
>               .                             .
>               .                             .
>               .                             .
>               .      getServerNodeId        .
>               o---------------------------->.  Server wont be ready
>               .    retry until success      .  until some time
>               .                             .
>               .                             .
>
>
>
> I am trying to make a client server application where a client
> is trying to get the nodeId of the server.
>
> The server opens up its ports and my client connects to the server.
> If unsuccessful the client side will retry to connect until it is
> successful.
>
> Considering the client is connected. Client application then will
> send a GetServerNodeId request to the server.
>
> What if the server is not ready to receive any request, how will
> I make my GetServerNodeId request to be sent without errors? My
> client application displays "Broken Pipe" when I run the client.
>
>
> Steps in Testing:
>
> 1. run server
> 2. client connects to server until success
> 3. server is not ready to read requests
> 4. getServerNodeId - retry until success.
>
>
> My problem revolves on my getServerNodeId request. Since my client
> application have no way of knowing if the server is already accepting
> requests from the client.
>
> Can anyone help me please?
>
>
> Here is a code snippet of the getServerNodeId :
>
>
> //--------------------- SNIP -----------------------------//
>
> inti sendNMCommand( void *data, inti size )
> {
>   int ret = -1;
>
>   if (nmCmdSockConnected == FALSE)
>   {
>     return (ERR);
>   }
>
>   ret = write( nmCmdSock, data, size );
>
>   if (ret != size)
>   {
>       return (ERR);
>   }
>
>   return( ret );
> }
>
>
> inti getServerNodeId(void)
> {
>   MSG_HEADER     header;
>   NODE_INFO      node_info;
>   int    stat;
>   char   *str;
>   struct in_addr tmpAddr;
>
>   memset( &header, 0, sizeof(header));
>   memset( &node_info, 0, sizeof(node_info));
>
>   header.msg_type     = CLI_NM_MSG_TYPE_NODE_ID | 
> CLI_NM_MSG_TYPE_COMMAND_SHOW;
>   header.msg_size = sizeof(header);
>
>   stat = sendNMCommand( &header, sizeof(header) );
>
>   if (stat == ERR )
>   {
>     return(ERR);
>   }
>
>   memset( &header, 0, sizeof(header));
>
>   stat = read(nmCmdSock, &header, sizeof(header));
>
>   if (stat <= 0)
>   {
>     return (ERR);
>   }
>
>   if (header.msg_ret_code != CLI_NM_MSG_RETCODE_SUCCESS)
>   {
>     return (ERR);
>   }
>
>   if (header.msg_type == (CLI_NM_MSG_TYPE_NODE_ID | 
> CLI_NM_MSG_TYPE_COMMAND_SHOW))
>   {
>     stat = recvNMData( &node_info, sizeof(node_info), &nmCmdSock);
>     if (stat == ERR)
>     {
>       return (ERR);
>     }
>
>     tmpAddr.s_addr = node_info.node_id;
>     str = inet_ntoa(tmpAddr);
>     setPrompt(str);
>   }
>   else
>   {
>     return (ERR);
>   }
>   return(OK);
> }
>
>
> //--------------------- SNIP -----------------------------//
>
>
>
>
>
> ->end.
>
>
>
>
>
>
>
>
>
> -
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