From 9c82b810db40084213192b0482e8c909aafde007 Mon Sep 17 00:00:00 2001
From: Kovid Goyal <kovid@kovidgoyal.net>
Date: Wed, 17 Jun 2015 10:25:35 +0530
Subject: [PATCH] Fix line buffering on windows in the RotatingLog

---
 src/calibre/srv/utils.py | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/src/calibre/srv/utils.py b/src/calibre/srv/utils.py
index 818ed3bb41..2ac9a500ec 100644
--- a/src/calibre/srv/utils.py
+++ b/src/calibre/srv/utils.py
@@ -309,7 +309,7 @@ class RotatingStream(object):
         self.set_output()
 
     def set_output(self):
-        self.stream = share_open(self.filename, 'ab', 1)  # line buffered
+        self.stream = share_open(self.filename, 'ab', -1 if iswindows else 1)  # line buffered
         try:
             self.current_pos = self.stream.tell()
         except EnvironmentError:
@@ -324,6 +324,11 @@ class RotatingStream(object):
         kwargs['safe_encode'] = True
         kwargs['file'] = self.stream
         self.current_pos += prints(*args, **kwargs)
+        if iswindows:
+            # For some reason line buffering does not work on windows
+            end = kwargs.get('end', b'\n')
+            if b'\n' in end:
+                self.flush()
         self.rollover()
 
     def rename(self, src, dest):