Re: [ECOS] Application is blocked on the while loop within bsd_connect() function

[Andrew Lunn <andrew at lunn dot ch>]

On Wed, Jan 02, 2008 at 11:57:34AM +0100, NGUYEN Thanh SILICOMP wrote:
> Hi all,
>
> Firstly, happy new year & best wished to all.
>
> I'm working on an application connecting to FTP server using ecos ftpclient 
> package.  I constate that the application waits for ever on a blocking 
> semaphore of cyg_tsleep() function when there is no ftp server available.
>
> In fact, for connecting to ftp server, ftpclient uses connect() that calls 
> itself bas_connect() in which the while loop is used for waiting for the 
> connection etablishment or an error occurring :
>
> while ((so->so_state & SS_ISCONNECTING) && so->so_error == 0) {
>        error = tsleep((caddr_t)&so->so_timeo, PSOCK | PCATCH,
>                       netcon, 0);
>
>        if (error)
>            break;
>
> }
>
> The paramter timo of tsleep set to 0 makes cyg_tsleep waiting for a 
> blocking semaphore at line 325 of the file synch.c 
> (net/tcpip/current/src/ecos/synch.c). And the wait time is usually long and 
> triggers the watchdog process in my application.
>
> I would like to know that there is any way to set up a timeout on socket 
> before calling connect() so that the application will be able to get out 
> this blocking situation ?
>
> Any idea or sugestion will be appreciated.

Take a look at
http://www.developerweb.net/forum/showthread.php?p=13486.  You will
need to modify the ftpclient code to implement this scheme for
connect.

        Andrew

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