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Fw: LibWWW

From: Henrik Frystyk Nielsen <frystyk@microsoft.com>
Date: Thu, 6 Jan 2000 18:41:07 -0800
Message-ID: <01a601bf58b8$b9968760$c2bb1eac@redmond.corp.microsoft.com>
To: <www-lib@w3.org>
Cc: "Judin, Victor" <victor.judin@materna.de>
Is this a common problem?

Henrik Frystyk Nielsen,
mailto:frystyk@microsoft.com

----- Original Message -----
From: "Judin, Victor" <victor.judin@materna.de>
To: "'Henrik Frystyk Nielsen'" <frystyk@w3.org>
Sent: Monday, December 27, 1999 06:16
Subject: LibWWW


>
> Hello Henrik,
>
> I've recently examined the LibWWW code , namely
TReader_read[ HTReader.c ],
> and following situation seems suspect to me:
> if HTHost has more than a single HTNet( many pending requests to the
host ),
> and the server/proxy sends responses to these requests in a single TCP
> packet( for example, 2 responses in a single packet ), which contains
more
> than 1 response, only the first pending HTNet will be callbacked, the
rest
> of TCP packet will be simply discarded, and the corresponding
request(s)
> will time out . Can you tell me, if  I'm right, or have I overseen
> something?
>
> Another point: in the same function, if precondition ( me->write >=
me->read
> )fails, NETREAD will not be called. Therefore, the user application
never
> gets to know, if the far end ( HTHost object which stands in 1:1
relation to
> HTReader )has closed the connection( I've seen the situation myself
with the
> Netscape server and LibWWW-based client ). As quick-and-dirty
workaround(
> signal handling (EINTR) not shown):
>
> /*============== HTReader_read================*/
> /*.............*/
> fd_set fdR;
>
> struct timeval tv = { 0, 0  };/* bail out from select
> immediately, real select() was called already in HTevtLst.c */
> /*.............*/
> FD_CLR( &fdR );
> FD_SET( soc, &fdR );
>
>             if( select( soc + 1, &fdR, NULL, NULL,  &tv ) > 0 )
>

> #ifdef FIONREAD
> #ifndef _WINDOWS
> #define ioctlsocket ioctl
> #endif
> /*
> **  POSIX undocumented but defined on most UNIXes( sun, BSD,..).
Documented
> on Windows..
> */
>                         int iBufLength = 0;
>                         if(( ioctlsocket( soc, FIONREAD, &iBufLength )
< 0 )
> || (iBufLength == 0))
> #else
> /*
> ** Don't really remove the byte( MSG_PEEK )
> */
>                         char cBuf[ 1 ];
>                         if ( recv( soc, cBuf, sizeof( cBuf ),
MSG_PEEK ) ==
> 0 )
> #endif
>                         {
>                                     EventOrder_add( s, HTEvent_CLOSE,
> HTGetTimeInMillies());
>                                     return HT_CLOSED;
>                         }
>            }
> /*......................*/
>
>
> Merry Christmas!
>
> Victor Judin
>
Received on Thursday, 6 January 2000 21:43:07 GMT

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