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Date:      Thu, 7 May 1998 21:15:43 -0600
From:      Daryn Kiely <kielyd@cadvision.com>
To:        "'freebsd-hackers@FreeBSD.ORG'" <freebsd-hackers@FreeBSD.ORG>
Subject:   Coding question
Message-ID:  <01BD79FD.50151E50.kielyd@cadvision.com>
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Hi there,
	
	I am currently working on a sockets program (using TCP connections) which 
has both a client and server.  I am finding that when the server closes the 
connection and a client attempts to do a write() the program is exiting 
(never returns from the write).  Now I was actually expecting the client 
process to receive a -1 when attempting to write to a closed socket.  Has 
anyone else experienced this problem, or does anyone have any suggestions 
as to how I can get around it?

	TIA
		Daryn


----------------- Code snippets --------------------------

void RunProcess()

{
        int fdServer, iNumChars, iStatus, iLength;
        char temp[1000], *pOutput;
        int iReturnValue;

        signal(SIGINT,SignalHandler);

        while (!g_iDone) {
/* must read the server name and socket name from config file */
                fdServer = ConnectToServer("daryn","smtp");
                if (fdServer < 0) { /* Failed to connect to the server */
                        LogPrintf(SEV_FAIL,"<send_mdt_message> Failed 
connecting to server [%d]\n",errno);
                        sleep(10);
/* Make this sleep configurable */
                        continue;
                }
                g_iConnected = 1;

                while (g_iConnected && !g_iDone) {
		iNumChars = ReadFromSocket(fdServer,temp,1000, 10);
		temp[iNumChars] = '\0';
		LogPrintf(SEV_DEBUG,"%s\n",temp);
                        pOutput = BuildPacket(&iLength);
                        if (WriteToSocket(fdServer,pOutput,iLength) != 
iLength) {
                                LogPrintf(SEV_WARN,"Failed writing to 
socket, attempting to reconnect [%d]\n",errno);
                                g_iConnected = 0;
                        }
                }
                CloseSocket(fdServer);
	}
}

size_t  WriteToSocket(int fdSocket, const void *buffer, size_t iLength)

{
        int iReturnValue;
fprintf(stderr,"5.0\n");
        iReturnValue = write(fdSocket, buffer,iLength);
fprintf(stderr,"5.1, return value = [%d]\n", iReturnValue);
        return(iReturnValue);
}

I see the 5.0 line of output but never see the "5.1".


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