# HG changeset patch
# User Pierre-Yves David <pierre-yves.david@ens-lyon.org>
# Date 1491470733 -7200
# Node ID 0130c3e1b1d9cf3d1066adeeb5e2a72a9c8fd4f6
# Parent  7e7743a01103b69131acb85aca2170bf8d727695
crecord: avoid setting non-existing signal SIGWINCH on windows

Windows do not have a SIGWINCH so we avoid setting the handler if the signal is
unknown.

diff -r 7e7743a01103 -r 0130c3e1b1d9 mercurial/crecord.py
--- a/mercurial/crecord.py	Sun Mar 26 15:06:09 2017 +0200
+++ b/mercurial/crecord.py	Thu Apr 06 11:25:33 2017 +0200
@@ -1614,12 +1614,15 @@
         method to be wrapped by curses.wrapper() for selecting chunks.
         """
 
-        origsigwinchhandler = signal.signal(signal.SIGWINCH,
-                                            self.sigwinchhandler)
+        origsigwinch = sentinel = object()
+        if util.safehasattr(signal, 'SIGWINCH'):
+            origsigwinch = signal.signal(signal.SIGWINCH,
+                                         self.sigwinchhandler)
         try:
             return self._main(stdscr)
         finally:
-            signal.signal(signal.SIGWINCH, origsigwinchhandler)
+            if origsigwinch is not sentinel:
+                signal.signal(signal.SIGWINCH, origsigwinch)
 
     def _main(self, stdscr):
         self.stdscr = stdscr