From 5f5d19d906320874e5ec249cb72fad8fa0d46c3f Mon Sep 17 00:00:00 2001
From: John Barboza <jbarboza@ca.ibm.com>
Date: Thu, 26 Apr 2018 05:27:32 -0700
Subject: [PATCH] zos: initialize pollfd revents

If not initialized to zero, revents could carry dirty bits in the
output from poll.

PR-URL: https://github.com/libuv/libuv/pull/1820
Reviewed-By: Richard Lau <riclau@uk.ibm.com>
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: Santiago Gimeno <santiago.gimeno@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
---
 src/unix/os390-syscalls.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/unix/os390-syscalls.c b/src/unix/os390-syscalls.c
index 21558ea8..a5dd3442 100644
--- a/src/unix/os390-syscalls.c
+++ b/src/unix/os390-syscalls.c
@@ -215,6 +215,7 @@ uv__os390_epoll* epoll_create1(int flags) {
     maybe_resize(lst, 1);
     lst->items[lst->size - 1].fd = lst->msg_queue;
     lst->items[lst->size - 1].events = POLLIN;
+    lst->items[lst->size - 1].revents = 0;
     uv_once(&once, epoll_init);
     uv_mutex_lock(&global_epoll_lock);
     QUEUE_INSERT_TAIL(&global_epoll_queue, &lst->member);
@@ -252,6 +253,7 @@ int epoll_ctl(uv__os390_epoll* lst,
     }
     lst->items[fd].fd = fd;
     lst->items[fd].events = event->events;
+    lst->items[fd].revents = 0;
   } else if (op == EPOLL_CTL_MOD) {
     if (fd >= lst->size || lst->items[fd].fd == -1) {
       uv_mutex_unlock(&global_epoll_lock);