wait for the screen is complete

src/fenrir/screenDriver/vcsaDriver.py

@@ -128,8 +128,8 @@ class driver():
             currScreen = str(tty.read()[3:-1])
             oldScreen = currScreen
             watchdog = select.epoll()
-            watchdog.register(vcsa[currScreen], select.EPOLLPRI)
+            watchdog.register(vcsa[currScreen], select.POLLPRI | select.POLLERR)
-            watchdog.register(tty, select.EPOLLPRI)
+            watchdog.register(tty, select.POLLPRI | select.POLLERR)
             lastScreenContent = b''
             while active.value == 1:
                 changes = watchdog.poll(2)
@@ -146,7 +146,7 @@ class driver():
                             except:
                                 pass
                             try:
-                                watchdog.register(vcsa[ currScreen ], select.EPOLLPRI)   
+                                watchdog.register(vcsa[ currScreen ], select.POLLPRI | select.POLLERR) 
                             except:
                                 pass
                             oldScreen = currScreen
@@ -159,8 +159,17 @@ class driver():
                     else:
                         self.env['runtime']['debug'].writeDebugOut('ScreenUpdate',debug.debugLevel.INFO)                                                 
                         vcsa[currScreen].seek(0)                                                
-                        screenContent = vcsa[currScreen].read()
+                        dirtyContent = vcsa[currScreen].read()
-                        if screenContent != lastScreenContent:
+                        screenContent = b''
+                        timeout = time.time()
+                        if dirtyContent != lastScreenContent:
+                            while screenContent != dirtyContent:
+                                screenContent = dirtyContent
+                                if time.time() - timeout > 0.2:
+                                    break
+                                vcsa[currScreen].seek(0)                        
+                                dirtyContent = vcsa[currScreen].read()
+                                time.sleep(0.01)
                             eventQueue.put({"Type":fenrirEventType.ScreenUpdate,"Data":None})
                             lastScreenContent = screenContent              
         except Exception as e:

src/fenrir/utils/screen_utils.py

@@ -7,6 +7,9 @@
 from core import debug
 from collections import Counter
 import string
+from select import select
+from select import epoll
+import select
 
 def removeNonprintable(text):
     # Get the difference of all ASCII characters from the set of printable characters
@@ -20,6 +23,16 @@ def insertNewlines(string, every=64):
 def splitEvery(toSplit, every=64):
     return list(toSplit[i:i+every] for i in range(0, len(toSplit), every))
 
+def hasMoreRead(fd):
+    r, w, e = select([fd], [], [], 0)
+    return (fd in r)
+
+def hasMorePollPri(fd):
+    p = epoll()
+    p.register(fd, select.POLLPRI | select.POLLERR)
+    r = p.poll(0)
+    return (fd in r)
+
 def trackHighlights(oldAttr, newAttr, text, lenght):
     result = ''
     currCursor = None