From fd2abf98048a0062ee35ebe89605cf67a0d3b76d Mon Sep 17 00:00:00 2001
From: Lorenz Stechauner <lorenz.stechauner@necronda.net>
Date: Fri, 7 Jul 2023 22:04:33 +0200
Subject: [PATCH] Handle EEXIST in async

---
 src/async.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/src/async.c b/src/async.c
index ad73a56..61ca1ed 100644
--- a/src/async.c
+++ b/src/async.c
@@ -243,7 +243,12 @@ void async_thread(void) {
             ev.events = async_a2e(evt->events);
             ev.data.ptr = evt;
 
-            if (epoll_ctl(epoll_fd, EPOLL_CTL_ADD, evt->fd, &ev) == -1) {
+            while (epoll_ctl(epoll_fd, EPOLL_CTL_ADD, evt->fd, &ev) == -1) {
+                if (errno == EEXIST) {
+                    errno = 0;
+                    if (epoll_ctl(epoll_fd, EPOLL_CTL_DEL, evt->fd, NULL) != -1)
+                        continue;
+                }
                 critical("Unable to add file descriptor to epoll instance");
                 return;
             }