* thread.c (rb_wait_for_single_fd): Clean up fds.revents every time

before calling ppoll(2). [Bug #12575] [ruby-dev:49725]


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@55613 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,3 +1,8 @@
+Fri Jul  8 21:49:28 2016  Naohisa Goto  <ngotogenome@gmail.com>
+
+	* thread.c (rb_wait_for_single_fd): Clean up fds.revents every time
+	  before calling ppoll(2). [Bug #12575] [ruby-dev:49725]
+
 Fri Jul  8 14:16:48 2016  Shugo Maeda  <shugo@ruby-lang.org>
 
 	* vm_args.c (vm_caller_setup_arg_block): call rb_sym_to_proc()

thread.c

@@ -3851,6 +3851,7 @@ rb_wait_for_single_fd(int fd, int events, struct timeval *tv)
     fds.events = (short)events;
 
     do {
+	fds.revents = 0;
 	lerrno = 0;
 	BLOCKING_REGION({
 	    result = ppoll(&fds, 1, timeout, NULL);