nobu	2018-02-01 02:26:20 +0900 (Thu, 01 Feb 2018)

  New Revision: 62145

  https://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=revision&revision=62145

  Log:
    io.c: fix fptr_copy_finalizer
    
    * io.c (fptr_copy_finalizer): fix inverted condition.  if
      finalizer does not change, pipe_list should not change too.

  Modified files:
    trunk/io.c
Index: io.c
===================================================================
--- io.c	(revision 62144)
+++ io.c	(revision 62145)
@@ -6201,12 +6201,14 @@ fptr_copy_finalizer(rb_io_t *fptr, const https://github.com/ruby/ruby/blob/trunk/io.c#L6201
 {
 #if defined(__CYGWIN__) || !defined(HAVE_WORKING_FORK)
     void (*const old_finalize)(struct rb_io_t*,int) = fptr->finalize;
+
+    if (old_finalize == fptr->finalize) return;
 #endif
 
     fptr->finalize = orig->finalize;
 
 #if defined(__CYGWIN__) || !defined(HAVE_WORKING_FORK)
-    if (old_finalize == pipe_finalize) {
+    if (old_finalize != pipe_finalize) {
 	struct pipe_list *list;
 	for (list = pipe_list; list; list = list->next) {
 	    if (list->fptr == fptr) break;

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