Zynq: Reading from stdin returns immediately

Jan.Sommer at dlr.de Jan.Sommer at dlr.de
Tue Feb 9 10:32:06 UTC 2021

I stand corrected.
It works with current master.
That should make searching easier.

> -----Original Message-----
> From: users <users-bounces at rtems.org> On Behalf Of Jan.Sommer at dlr.de
> Sent: Tuesday, February 9, 2021 10:58 AM
> To: users at rtems.org
> Subject: Zynq: Reading from stdin returns immediately
> Hello,
> I tried to read data from stdin via scanf in RTEMS5.1 for some user input for a
> Zynq based board, but it returns immediately with 0.
> Also fscanf, read or fgetc do not block and return immediately. The flags for
> stdin show that the O_NONBLOCK flag is not set.
> I tried to check with the termios application from the testsuite since it uses
> those functions as well.
> There seems to be the same behavior. At least I only see the test begin and
> end markers, but never the "Press any key to check the termios input
> capabilities (20s remaining)" as mentioned in the example output.
> The test also finishes immediately.
> I also found this thread from Joel, which might be related, but I am not sure:
> https://lists.rtems.org/pipermail/devel/2020-November/063533.html
> The rtems_shell seem to work however. At least there the input is correctly
> received and processed.
> Does someone have a hint where I would need to look? I will try with the
> current master as well, but don't expect that this will change much.
> Best regards,
>     Jan
> Deutsches Zentrum für Luft- und Raumfahrt e. V. (DLR) German Aerospace
> Center Institute for Software Technology | Software for Space Systems and
> Interactive Visualization | Lilienthalplatz 7 | 38108 Braunschweig | Germany
> Jan Sommer
> Telephone +49 531 295-2494 | Telefax 0531 295-2767 | jan.sommer at dlr.de
> DLR.de/SC
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