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_3@55957 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 1 insertions, 0 deletions

diff --git a/thread.c b/thread.c
index a0e31c5326..4fadbd91aa 100644
--- a/thread.c
+++ b/thread.c
@@ -3717,6 +3717,7 @@ 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);