GPU Display: Fix do not exit on arrow key presses in the console

Author: davidrohr

GPU/GPUTracking/Global/GPUChainTracking.cxx

@@ -860,6 +860,12 @@ int32_t GPUChainTracking::RunChainFinalize()
       usleep(10000);
       if (GetProcessingSettings().runsStandalone) {
         iKey = kbhit() ? getch() : 0;
+        if (iKey == 27 && kbhit()) { // Escape sequence (arrow keys, ...), not the ESC key
+          while (kbhit()) {
+            getch();
+          }
+          iKey = 0;
+        }
         if (iKey == 27) {
           GetProcessingSettings().eventDisplay->setDisplayControl(2);
         } else if (iKey == 'n') {

GPU/GPUTracking/utils/linux_helpers.h

@@ -26,7 +26,8 @@ static inline int32_t getch()
   newt = oldt;
   newt.c_lflag &= ~(ICANON | ECHO);
   tcsetattr(STDIN_FILENO, TCSANOW, &newt);
-  int32_t retVal = getchar();
+  unsigned char c;
+  int32_t retVal = read(STDIN_FILENO, &c, 1) == 1 ? c : -1; // Not getchar(): its buffer would hide the remaining bytes from kbhit()
   tcsetattr(STDIN_FILENO, TCSANOW, &oldt);
   return (retVal);
 }