Assistant: Fix high CPU usage if a parent process finishes

If Assistant has been started in the remote control mode in Linux
and it's parent process finishes, then Assistant increases CPU load
to 100% and continuously raises it's window.
It is because QSocketNotifier for stdin continuously emits
activated() signal although there is no data to read.
So disable the notifier after receiving EOF.

Change-Id: I1b01108e1b97bc4fd54411b16489082be7f47bf4
Reviewed-by: Karsten Heimrich <karsten.heimrich@theqtcompany.com>
Reviewed-by: Christian Kandeler <christian.kandeler@theqtcompany.com>

1 files changed, 5 insertions, 1 deletions

diff --git a/src/assistant/assistant/stdinlistener.cpp b/src/assistant/assistant/stdinlistener.cpp
index 36cf8fb59..857b29701 100644
--- a/src/assistant/assistant/stdinlistener.cpp
+++ b/src/assistant/assistant/stdinlistener.cpp
@@ -60,7 +60,11 @@ void StdInListener::receivedData()
     QByteArray ba;
     while (true) {
         const int c = getc(stdin);
-        if (c == EOF || c == '\0')
+        if (c == EOF) {
+            setEnabled(false);
+            break;
+        }
+        if (c == '\0')
             break;
         if (c)
             ba.append(char(c));