[ECOS] Select() issues

[Andre-John Mas]

Does tcflush(fd,TCIOFLUSH) actually work?

I did a few tests, removing the code for modifying the terminal
attributes and find that I pass straight through select, if I
had hit a few enters before getting to the tcflush statement.

Andre

On 9-Jan-07, at 15:21 , Andre-John Mas wrote:

> Hi,
>
> We have a solution working on the AdderII platform, using eCos.
> One component of the application is a serial terminal, with
> termios support. While putting the UI through its paces we
> came across a small issue:
>
> If we hit enter a number of times prior to the first select()
> call, select() does not return when a key is pressed. I
> thought that it could be to a full UART buffer, but trying
>
> cin.ignore()
>
> or
>
> tcflush(fd,TCIOFLUSH)
>
> prior to the select does not fix the issue.
>
> My code looks something as follows:
>
>    struct termios ts, ots; /* termios setting, old termios setting */
>    int            fd = STDIN_FILENO;
>    struct timeval tv;
>    struct timeval *tvPtr = NULL;
>
>    tcgetattr( fd, &ts );
>    ots = ts;
>    ts.c_flag &= ~(ICANON);
>    tcsetattr(fd, TCSAFLUSH, &ts);
>
>    if ( this->timeout > -1 )
>    {
>        tv.tv_sec = this->timeout;
>        tv.tv_usec = 0;
>        tvPtr = &tv;
>    }
>
>    FD_ZERO( &fds );
>    FD_SET( STDIN_FILENO, &fds );
>
>    int result = select(fd + 1, &fds, NULL, NULL, tvPtr);
>
> Am I missing something? Any help would be appreciated.
>
> Andre
>
>
>
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> and search the list archive: http://ecos.sourceware.org/ml/ecos- 
> discuss


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