[ECOS] Any problem ?

Gary Thomas gary@mlbassoc.com
Fri Mar 25 16:23:00 GMT 2011


On 03/25/2011 09:27 AM, ratheesh kannoth wrote:
> On Fri, Mar 25, 2011 at 8:54 PM, Gary Thomas<gary@mlbassoc.com>  wrote:
>> On 03/25/2011 09:17 AM, ratheesh kannoth wrote:
>>>
>>> Is there any prob with below code segment  in eCos ?
>>>
>>> {
>>>                 fd_set rd_fds;
>>>
>>>                 FD_ZERO(&rd_fds);
>>>
>>>                  while (1) {
>>>
>>>                            timeout.tv_sec = 1;
>>>                            timeout.tv_usec = 0;
>>>
>>>                           if (select(0,&rd_fds, NULL, NULL,&timeout)<    0) {
>>>                                        printf("\n  Error \n");
>>>                                        sleep(1);
>>>                                        continue;
>>>                            }
>>>
>>>                           printf("\n  Success  \n");
>>>                   }
>>>    }
>>>
>>
>> Yes - the first parameter to select() is the number of open file
>> descriptors to check (fd in 0..N-1).  Putting a zero there will
>> never yield any activity.
>>
>> Typically, one puts the max # of open file descriptors or at
>> least the highest known open one + 1.

> True. But it runs perfectly on  eCos and linux.  I facing some
> problem, whenever i hit a key on keyboard in eCos. Is there connection
> to this select system call here.

How are you connecting to the keyboard?  If you are just using stdin,
the default will be the debug/console channel which is not interrupt
driven and select can't help you.

-- 
------------------------------------------------------------
Gary Thomas                 |  Consulting for the
MLB Associates              |    Embedded world
------------------------------------------------------------

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