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authorStefan Metzmacher <metze@samba.org>2013-02-22 21:45:11 +0100
committerJeremy Allison <jra@samba.org>2013-03-01 11:59:51 -0800
commit6952d761d2b9ebb2457916d9dfa3f070c0f62228 (patch)
tree8feb4f4ced2f582278c48faeb78f21adb6aea78b /lib
parentde0204ccae514b26524893b51414c6c772a35a55 (diff)
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tevent: ignore POLLNVAL from poll() and disable the event
Signed-off-by: Stefan Metzmacher <metze@samba.org> Reviewed-by: Jeremy Allison <jra@samba.org>
Diffstat (limited to 'lib')
-rw-r--r--lib/tevent/tevent_poll.c45
1 files changed, 44 insertions, 1 deletions
diff --git a/lib/tevent/tevent_poll.c b/lib/tevent/tevent_poll.c
index 763a139c7c..867d951ee1 100644
--- a/lib/tevent/tevent_poll.c
+++ b/lib/tevent/tevent_poll.c
@@ -501,6 +501,7 @@ static int poll_event_loop_poll(struct tevent_context *ev,
int timeout = -1;
int poll_errno;
struct tevent_fd *fde = NULL;
+ unsigned i;
if (ev->signal_events && tevent_common_check_signal(ev)) {
return 0;
@@ -555,6 +556,26 @@ static int poll_event_loop_poll(struct tevent_context *ev,
pfd = &poll_ev->fds[idx];
+ if (pfd->revents & POLLNVAL) {
+ /*
+ * the socket is dead! this should never
+ * happen as the socket should have first been
+ * made readable and that should have removed
+ * the event, so this must be a bug.
+ *
+ * We ignore it here to match the epoll
+ * behavior.
+ */
+ tevent_debug(ev, TEVENT_DEBUG_ERROR,
+ "POLLNVAL on fde[%p] fd[%d] - disabling\n",
+ fde, pfd->fd);
+ poll_ev->fdes[idx] = NULL;
+ poll_ev->deleted = true;
+ DLIST_REMOVE(ev->fd_events, fde);
+ fde->event_ctx = NULL;
+ continue;
+ }
+
if (pfd->revents & (POLLHUP|POLLERR)) {
/* If we only wait for TEVENT_FD_WRITE, we
should not tell the event handler about it,
@@ -575,7 +596,29 @@ static int poll_event_loop_poll(struct tevent_context *ev,
}
if (flags != 0) {
fde->handler(ev, fde, flags, fde->private_data);
- break;
+ return 0;
+ }
+ }
+
+ for (i = 0; i < poll_ev->num_fds; i++) {
+ if (poll_ev->fds[i].revents & POLLNVAL) {
+ /*
+ * the socket is dead! this should never
+ * happen as the socket should have first been
+ * made readable and that should have removed
+ * the event, so this must be a bug or
+ * a race in the poll_mt usage.
+ */
+ fde = poll_ev->fdes[i];
+ tevent_debug(ev, TEVENT_DEBUG_WARNING,
+ "POLLNVAL on dangling fd[%d] fde[%p] - disabling\n",
+ poll_ev->fds[i].fd, fde);
+ poll_ev->fdes[i] = NULL;
+ poll_ev->deleted = true;
+ if (fde != NULL) {
+ DLIST_REMOVE(ev->fd_events, fde);
+ fde->event_ctx = NULL;
+ }
}
}