Issue #10350: Read and save errno before calling a function which might overwrite it.

Original patch by Hallvard B Furuseth.

diff --cc Misc/NEWS
index 39e5eca5932151279b6cc3d61841d915d9299948,94af4462b9bc7589b52c29b0a7a582a538c574f2..3f3d1df87c9ddf9d010357b34a89f69d78bed784
--- 1/Misc/NEWS
--- 2/Misc/NEWS
+++ b/Misc/NEWS
@@@ -419,8 -97,9 +419,11 @@@ Core and Builtin
  Library
  -------
  
+ - Issue #10350: Read and save errno before calling a function which might
+   overwrite it.  Original patch by Hallvard B Furuseth.
+ 
 +- Issue #11610: Introduce a more general way to declare abstract properties.
 +
  - Issue #13591: A bug in importlib has been fixed that caused import_module
    to load a module twice.
  

diff --cc Modules/_io/fileio.c
Simple merge

diff --cc Modules/_multiprocessing/semaphore.c
Simple merge

diff --cc Modules/main.c
Simple merge

diff --cc Modules/readline.c
Simple merge

diff --cc Modules/timemodule.c
Simple merge