Re: [ECOS] Any problem ?

[Gary Thomas <gary at mlbassoc dot com>]

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.

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