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-rw-r--r--ev.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/ev.c b/ev.c
index 76dc021..28ed91b 100644
--- a/ev.c
+++ b/ev.c
@@ -1294,6 +1294,8 @@ ev_io_stop (EV_P_ struct ev_io *w)
if (!ev_is_active (w))
return;
+ assert (("ev_io_start called with illegal fd (must stay constant after start!)", w->fd >= 0 && w->fd < anfdmax));
+
wlist_del ((WL *)&anfds[w->fd].head, (WL)w);
ev_stop (EV_A_ (W)w);