From patchwork Mon Sep 10 12:34:03 2012
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Subject: Question: exporting QWS_KEYBOARD=LinuxInput:/dev/input/event0" hang
 application
Date: Mon, 10 Sep 2012 02:34:03 -0000
From: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
X-Patchwork-Id: 182868
Message-Id: <20120910143403.48f87840@skate>
To: Belisko Marek <marek.belisko@gmail.com>
Cc: buildroot <buildroot@busybox.net>

Le Mon, 10 Sep 2012 11:08:54 +0200,
Belisko Marek <marek.belisko@gmail.com> a écrit :

> I know this isn't related to buildroot but maybe somehow have same troubles.
> I've build simple buildroot rootfs (2012.08 based) with QT4.8.2, my
> small qt application
> and dropbear.
> 
> I can start my application and it is working fine. When need to add
> keyboard handling
> from USB keyboard application hang (with no useful data in console) that way:
> export QWS_KEYBOARD="LinuxInput:/dev/input/event0" ./app -qws
> 
> I've double check qt configuration and linuxinput is checked.
> Anybody have same troubles?

I remember having problems with Qt as soon as I started defining
QWS_KEYBOARD, but I don't remember if the problem was exactly the one
you had.

Can you try to add the attached patch to the Qt package? It has been
written for Qt 4.7.3, but since the patch is trivial, I guess it can be
quickly adapted to Qt 4.8.2. It's the patch I had to fix the problem I
encountered, but again I don't remember the exact problem, and I have
been apparently too lazy to describe it in the patch description.

Best regards,

Thomas


--- qt-4.7.3.orig/src/gui/embedded/qkbdlinuxinput_qws.cpp	2011-03-30 07:19:04.000000000 +0200
+++ qt-4.7.3/src/gui/embedded/qkbdlinuxinput_qws.cpp	2011-09-12 18:22:52.978846803 +0200
@@ -127,7 +127,7 @@
 
         // play nice in case we are started from a shell (e.g. for debugging)
         m_tty_fd = isatty(0) ? 0 : -1;
-
+#if 0
         if (m_tty_fd >= 0) {
             // save tty config for restore.
             tcgetattr(m_tty_fd, &m_tty_attr);
@@ -154,6 +154,7 @@
             cfsetospeed(&termdata, 9600);
             tcsetattr(m_tty_fd, TCSANOW, &termdata);
         }
+#endif
     } else {
         qWarning("Cannot open keyboard input device '%s': %s", qPrintable(dev), strerror(errno));
         return;