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Date: Fri, 21 Feb 2003 17:39:59 +0100
From: Corinna Vinschen <corinna-cygwin AT cygwin DOT com>
To: cygwin AT cygwin DOT com
Subject: Re: to use dup() in cygwin
Message-ID: <20030221163959.GS1403@cygbert.vinschen.de>
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References: <OF94455B9D DOT B708D739-ONC1256CD4 DOT 00316F66 AT madrid DOT jazztel DOT com>
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In-Reply-To: <OF94455B9D.B708D739-ONC1256CD4.00316F66@madrid.jazztel.com>
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On Fri, Feb 21, 2003 at 10:01:17AM +0100, Fernando DOT Frutos DOT Martin AT es DOT jazztel DOT com wrote:
> Hi! and sorry my english,
> I've a server in Linux and Unix and it works perfectly, but when I compile 
> the same code in Cygwin, it doesn`t send the data to the socket, I use the 
> dup() comand.
> this is part of the program what, I repeat, works well in linux and unix 
> (sun, HP) 
> 
> /*close the display exit and send it to the socket*/
> 
>     close(1);
>     iError=dup(iDescSock);
>     if (iError==-1)
>         {
>         return(EEXECCOM);
>         }
>     sprintf(pcComando,"EjecutarComando_VB.ksh.%s",pcNombreAux);
>     iError=system(pcComando);
>     if (iError==-1)
>         {
>         fprintf(stderr,"Error en llamada a ejecutar");
>         return(EEXECCOM);
>         }

Did you try to

- look if you get the expected file descriptor from dup?
- look which errno you get?
- run the application under strace?
- run the application under gdb?

After that and if you found that the problem is actually a Cygwin
problem, please write a *short* testcase which allows to reproduce
the problem and I';ll be happy to have a look into this issue.

Corinna

-- 
Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Developer                                mailto:cygwin AT cygwin DOT com
Red Hat, Inc.

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