From 03e862aa705164f1f2907abbfa49367251931f39 Mon Sep 17 00:00:00 2001
From: Kovid Goyal <kovid@kovidgoyal.net>
Date: Wed, 17 Apr 2019 09:27:57 +0530
Subject: [PATCH] py3: Fix passing stdout/stderr to RotatingLog not working

---
 src/calibre/srv/utils.py | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/src/calibre/srv/utils.py b/src/calibre/srv/utils.py
index 3f31b72b9f..6575787519 100644
--- a/src/calibre/srv/utils.py
+++ b/src/calibre/srv/utils.py
@@ -322,7 +322,14 @@ class RotatingStream(object):
         self.set_output()
 
     def set_output(self):
-        self.stream = share_open(self.filename, 'ab', -1 if iswindows else 1)  # line buffered
+        if ispy3:
+            if iswindows:
+                self.stream = share_open(self.filename, 'ab')
+            else:
+                # see https://bugs.python.org/issue27805
+                self.stream = open(os.open(self.filename, os.O_WRONLY|os.O_APPEND|os.O_CREAT|os.O_CLOEXEC), 'wb')
+        else:
+            self.stream = share_open(self.filename, 'ab', -1 if iswindows else 1)  # line buffered
         try:
             self.current_pos = self.stream.tell()
         except EnvironmentError: