From: mhahn AT esoc DOT esa DOT de (Markus Hahn)
Subject: TCPLIB : Connect DOS 2 UNIX ?
To: djgpp AT sun DOT soe DOT clarkson DOT edu
Date: Fri, 23 Jun 1995 16:32:08 +0000 (GMT)


Hello to all you djgpp subscribers.


This is really gonna be the last time I try to get my problem solved.
Isn't there anybody to deal with my connectivity problem or did I just
fail to receive the mail due to subscribing lately to the mailing list ?

I've written some kind of database server that allows for accessing the
data repository from a terminal (PC) where no DBMS functionality is 
available. So I REALLY need to port this application to the PC.

   
                     Since I have installed the
 
                              TCP-LIB,

              connecting to the workstation was impossible, 



The echo server I have written as a sample isn't running when the client
is located on the PC and the server is located on the workstation, while
it works if both the programs are located on the workstation (using the 
built-in networking routines and the origin gcc).

This (of course) is NOT due to missing BYTE-ORDERING-ROUTINES ! 
(I really am not THAT stupid !)

On the workstation the routines (e.g. htonl/s) don't show any
effect, while with the PC they seem to reverse the bytes (and back !)
as they are expected to do.
When connecting to the (up-and-alive) server, the program complains 
about EINVAL !
I can't find any DOCUMENTATION about tcp-lib exceeding the contents 
of the headers. Is there any kind of error detection supported like 
        
        extern int errno;

which could be evaluated to get a hint ?

EINVAL == { EAFNOSUPPORT, EOPNOTSUPPORT, EFAULT, EISCONN, EPROTONOSUPPORT }

              mapped to 

EIO    == {  ECONNREFUSED  }
 
That's not too talkative. Isn't it ?
So the only hint I got is that the connection wasn't refused !


/*****************************************************************************/
/*                                                                           */
/* Have you any idea what the hell I did wrong, or where I can get some docu */
/* about tcp-lib (especially error handling) ?                               */
/*                                                                           */
/*****************************************************************************/


Many thanx and good by for this time !

Marcus



the code fragment involved >> -------------------------------------------------



  #define  SERV_HOST_ADDR   "131.176.62.3"                        /* my station */
  #define  SERV_TCP_PORT     6004

  bzero((char *) &serv_addr, sizeof(cli_addr));                   /* clean up structure */ 
  serv_addr.sin_family       = AF_INET;                           /* Internet Protocol */
  serv_addr.sin_addr.s_addr  = htonl(inet_addr(SERV_HOST_ADDR));  /* the server's host */
  serv_addr.sin_port         = htons(SERV_TCP_PORT);              /* server's port */