QPID-3405: Slightly hacky way to get reconnect to work

- If we fail to reset the epoll settings of a file handle when going
  round the poll loop and it's because the handle is not in the epoll
  set then just try to add it into the epoll set.

  This gets round the case where connect closes a socket fd (implicitly
  taking out of all epoll sets) and then tries to connect again.

git-svn-id: https://svn.apache.org/repos/asf/qpid/trunk/qpid@1157273 13f79535-47bb-0310-9956-ffa450edef68

1 files changed, 6 insertions, 1 deletions

diff --git a/cpp/src/qpid/sys/epoll/EpollPoller.cpp b/cpp/src/qpid/sys/epoll/EpollPoller.cpp
index 9ad05c71a3..dcc9d9181c 100644
--- a/cpp/src/qpid/sys/epoll/EpollPoller.cpp
+++ b/cpp/src/qpid/sys/epoll/EpollPoller.cpp
@@ -384,7 +384,12 @@ void PollerPrivate::resetMode(PollerHandlePrivate& eh) {
         epe.data.u64 = 0; // Keep valgrind happy
         epe.data.ptr = &eh;
 
-        QPID_POSIX_CHECK(::epoll_ctl(epollFd, EPOLL_CTL_MOD, eh.fd(), &epe));
+        int rc = ::epoll_ctl(epollFd, EPOLL_CTL_MOD, eh.fd(), &epe);
+        // If something has closed the fd in the meantime try adding it back
+        if (rc ==-1 && errno == ENOENT) {
+            rc = ::epoll_ctl(epollFd, EPOLL_CTL_ADD, eh.fd(), &epe);
+        }
+        QPID_POSIX_CHECK(rc);
 
         eh.setActive();
         return;