[ECOS] Application is blocked on the while loop withinbsd_connect() function

Gary Thomas gary@mlbassoc.com
Fri Jan 4 14:54:00 GMT 2008


NGUYEN Thanh SILICOMP wrote:
> Hi,
> 
> Yes, for solving the issue, i had to make a non blocking socket for 
> ftpclient. Instead of using fcntl() with F_GETFL or F_SETFL that is not 
> supported at this moment in Ecos,  I used ioctl with FIONBIO. My 
> application seems working good now.

Perhaps you could send a patch with your changes and we could
wrap them into the public source, with some CDL, etc?

> Andrew Lunn a écrit :
>> 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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Gary Thomas                 |  Consulting for the
MLB Associates              |    Embedded world
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