source: vendor/3.6.23/examples/bind9-patches/0002-prevent-a-valgrind-uninitialised-memory-warning.patch

From 31059dee4a706bb4f25f3dccaae7616451eabd8b Mon Sep 17 00:00:00 2001
From: Andrew Tridgell <tridge@samba.org>
Date: Wed, 17 Feb 2010 10:59:42 +1100
Subject: [PATCH 2/5] prevent a valgrind uninitialised memory warning

epoll uses a union, so to prevent passing uninitialised data in a
syscall we need to zero it before use.
---
 lib/isc/unix/socket.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/lib/isc/unix/socket.c b/lib/isc/unix/socket.c
index d09fe51..4796ee4 100644
--- a/lib/isc/unix/socket.c
+++ b/lib/isc/unix/socket.c
@@ -652,6 +652,7 @@ watch_fd(isc_socketmgr_t *manager, int fd, int msg) {
                event.events = EPOLLIN;
        else
                event.events = EPOLLOUT;
+       memset(&event.data, 0, sizeof(event.data));
        event.data.fd = fd;
        if (epoll_ctl(manager->epoll_fd, EPOLL_CTL_ADD, fd, &event) == -1 &&
            errno != EEXIST) {
@@ -719,6 +720,7 @@ unwatch_fd(isc_socketmgr_t *manager, int fd, int msg) {
                event.events = EPOLLIN;
        else
                event.events = EPOLLOUT;
+       memset(&event.data, 0, sizeof(event.data));
        event.data.fd = fd;
        if (epoll_ctl(manager->epoll_fd, EPOLL_CTL_DEL, fd, &event) == -1 &&
            errno != ENOENT) {
--
1.6.3.3