InfoMagic Internet Tools 1995 April/Internet Tools.iso/dos_win/winsock/maillist/93-10.Z/93-10/text0216.txt

Text File | 1993-10-18 | 6.0 KB | 145 lines

Please unscribe.

Thanks,

Allen
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Date: 18 Oct 93 00:17:01 GMT
From: [e-mail] (Paul Brooks)
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Subject: Correct format for STRUCT HOSTENT ?

Could someone more familar with BSD than I please help?

When constructing an empty list for the ALIASES fields in
the various database structs, is it permissable for the field to be
NULL, or must it be a valid pointer to a NULL pointer?

I am getting a few (but not all) applications crashing when I use
a NULL pointer for the h_aliases field, but surely good programming
practice would be to check if that was NULL before using it...

--
Paul Brooks              |[e-mail]       |Emerging Standard:
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From [e-mail]  Sun Oct 17 23:04:35 1993
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To: [e-mail] (Stephen Heilbronner),
        [e-mail]
From: "Peter R. Tattam"  <[e-mail]>
Date:         18 Oct 93 14:03:55 GMT+1000
Subject:      Re: QuickWin calling Trumpet Winsock functions doesnt't wor
Priority:     normal
X-Mailer:     Pegasus Mail v2.3 (R4).

> Date:          Fri, 15 Oct 93 22:38:42 EDT
> Reply-to:      [e-mail]
> From:          [e-mail] (Stephen Heilbronner)
> To:            Multiple recipients of list <[e-mail]>
> Subject:       QuickWin calling Trumpet Winsock functions doesnt't work anymore

> I've been using QuickWin (a simple environment from Visual C
> to support convential C programs under Windows)
> to call socket functions from Trumpet Winsock #15.
> (I know I'm not supposed to call any DLL's from QuickWin,
> but I'm porting software from UNIX.)
>
> This has worked fine so far. With the new version of
> Trumpet I get a run-time error 202 on the first
> gethostname or gethostbyaddr after WSAStartup though.
>
> Has anybody else experienced this, too ? Is there a simple
> explanation for this or a workaround ? (BTW: Using SPRY's
> APP2SOCK.DLL seems to work, at least the COMMInitial(),
> COMMOpen() and CommGetMyIP() functions.)
> I'd guess it's the way WINSOCK.DLL was compiled....
>
> Thx for any hints (Even if you tell it wont work on
> other vendors' architectures either) !
>
> Stephen Heilbronner
> <[e-mail]>
>

This error is in response to questions I asked a month or so ago regarding
stack overflows.  Since it is quite tricky to safely recover from a stack
overflow (most likely the data segment is corrupted by then), I have opted
to let Turbo Pascal kill the calling app with a 202 error.

App developers *Beware*...  Trumpet winsock does need a bit of stack to do
its thing, especially gethostby... calls.  If a puny stack has been
allocated then tough bickies. I'm going to look at altering the DNS code to
use a pool of DNS buffers rather than allocating from the stack.  Also the
debug traces use stack because of extensive string manipulation.

In general, I guess the trumpet winsock needs some 1-2K of stack space.
You should also take into account that sometimes windows messages may
cause the stack to be swallowed up quickly.  I suggest to most people to
use a stack of 16K minimum.

Is there an official word from any microsoft programmers on what constitues
an adequate stack for a fairly complex windows app?

Peter
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P.Tattam                                  International Phone [phone]
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From: [e-mail]  (Derek W. Brown)
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I'll read the newsgroup :}

dB


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