merge revision(s) 55613: [Backport #12575]

	* 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/branches/ruby_2_2@55924 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 1 insertions, 0 deletions

diff --git a/thread.c b/thread.c
index 0b89918eea..b6c5b35693 100644
--- a/thread.c
+++ b/thread.c
@@ -3620,6 +3620,7 @@ rb_wait_for_single_fd(int fd, int events, struct timeval *tv)
     fds.events = (short)events;
 
 retry:
+    fds.revents = 0;
     lerrno = 0;
     BLOCKING_REGION({
 	result = ppoll(&fds, 1, timeout, NULL);