Conference hydra::axp-developer

3535.0. "Landmark Systems Corporation" by HYDRA::AXPDEVELOPER (Alpha Developer support) Thu Apr 24 1997 04:21

    Company Name :  Landmark Systems Corporation
    Contact Name :  Shyam Harohalli
    Phone        :  (703) 902-8124
    Fax          :  
    Email        :  [email protected]
    Date/Time in :  24-APR-1997 03:20:49
    Entered by   :  Ian Chamberlin
    SPE center   :  REO

    Category     :  unix
    OS Version   :  3.2
    System H/W   :  


    Brief Description of Problem:
    -----------------------------

From:	SMTP%"[email protected]" 23-APR-1997 09:18:05.88
To:	[email protected] ([email protected])
CC:	[email protected]
Subj:	/usr/inclue/netinet/tcp_var.h

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Date: Wed, 23 Apr 1997 09:09:35 -0400
To: [email protected] ([email protected])
From: Shyam Harohalli <[email protected]>
Subject: /usr/inclue/netinet/tcp_var.h
Cc: [email protected]

Hello,
I am trying to compile a file on Digital UNIX 3.2.  This file includes the
header file - /usr/include/netinet/tcp_var.h.  My program does not get
compiled,  and gives an error message - 
"/usr/include/netinet/tcp_var.h:110: field `t_template' has incomplete type"

I compared tcp_var.h on Digital UNIX with tcp_var.h on Solaris/HP-UX/AIX.
In all these platforms, 't_template' is a pointer to structure 'tcpiphdr',
whereas in Digital UNIX, t_template is structure itself. I then included a
local copy of tcp_var.h after modifying line 110 as follows:

   107  #define TCPOOB_HAVEDATA 0x01
   108  #define TCPOOB_HADDATA  0x02
   109
   110          struct  tcpiphdr *t_template;    /* skeletal packet for transmit
   111                                           * (used to be mbuf)

This time compilation was successful. But I do not know yet, if this change
can cause any run-time errors.

Could you please verify if t_template is a pointer or a structure.  If this
is a structure, then, the file tcp_var.h has to include the header
<netinet/tcpip.h>.

Thanks,

Shyam
Landmark Systems Corporation
(703) 902-8124
[email protected]
--
	Shyam Harohalli
	(703) 902 8124
	[email protected]

(Sent 24 April)
Shyam,
	I dont know the reason for the difference between t_template on Digital
Unix (aka Digital OSF/1) and  Solaris/HP-UX/AIX. I could guess its due to the
differnt origins - BSD vs System V, but that is only my guess.

	The definition of t_template is correct as a structure for Digital Unix,
and redefining it to a pointer is likely to cause problems else where - and I
wouldn;t recommend it. I would suggest you leave t_template as a tcpiphdr
structure, and include <netinet/tcpip.h> in your source before including
<tcp_var.h>, to provide the structure definition.

regards


Ian Chamberlin,

Digital Equipment Co, Software Partner Engineering.