diff --git a/trunk/3rdparty/st-srs/event.c b/trunk/3rdparty/st-srs/event.c
index c2386b054..4fea5986e 100644
--- a/trunk/3rdparty/st-srs/event.c
+++ b/trunk/3rdparty/st-srs/event.c
@@ -98,6 +98,7 @@ static struct _st_kqdata {
     int dellist_size;
     int dellist_cnt;
     int kq;
+    pid_t pid;
 } *_st_kq_data;
 
 #ifndef ST_KQ_MIN_EVTLIST_SIZE
@@ -463,6 +464,7 @@ ST_HIDDEN int _st_kq_init(void)
         goto cleanup_kq;
     }
     fcntl(_st_kq_data->kq, F_SETFD, FD_CLOEXEC);
+    _st_kq_data->pid = getpid();
 
     /*
      * Allocate file descriptor data array.
@@ -698,6 +700,7 @@ ST_HIDDEN void _st_kq_dispatch(void)
         tsp = &timeout;
     }
 
+ retry_kevent:
     /* Check for I/O operations */
     nfd = kevent(_st_kq_data->kq,
                  _st_kq_data->addlist, _st_kq_data->addlist_cnt,
@@ -791,6 +794,23 @@ ST_HIDDEN void _st_kq_dispatch(void)
             osfd = _st_kq_data->evtlist[i].ident;
             _ST_KQ_REVENTS(osfd) = 0;
         }
+    } else if (nfd < 0) {
+        if (errno == EBADF && _st_kq_data->pid != getpid()) {
+            /* We probably forked, reinitialize kqueue */
+            if ((_st_kq_data->kq = kqueue()) < 0) {
+                /* There is nothing we can do here, will retry later */
+                return;
+            }
+            fcntl(_st_kq_data->kq, F_SETFD, FD_CLOEXEC);
+            _st_kq_data->pid = getpid();
+            /* Re-register all descriptors on ioq with new kqueue */
+            memset(_st_kq_data->fd_data, 0, _st_kq_data->fd_data_size * sizeof(_kq_fd_data_t));
+            for (q = _ST_IOQ.next; q != &_ST_IOQ; q = q->next) {
+                pq = _ST_POLLQUEUE_PTR(q);
+                _st_kq_pollset_add(pq->pds, pq->npds);
+            }
+            goto retry_kevent;
+        }
     }
 }
 
diff --git a/trunk/doc/CHANGELOG.md b/trunk/doc/CHANGELOG.md
index e80454d63..cf8dfacd1 100644
--- a/trunk/doc/CHANGELOG.md
+++ b/trunk/doc/CHANGELOG.md
@@ -8,6 +8,7 @@ The changelog for SRS.
 
 ## SRS 5.0 Changelog
 
+* v5.0, 2021-10-17, Support daemon(fork twice) for Darwin/OSX [ST#23](https://github.com/ossrs/state-threads/issues/23). v5.0.18
 * v5.0, 2021-10-16, DVR: support mp3 audio codec. (#2593) v5.0.17
 * v5.0, 2021-10-03, OpenWRT: Disable mprotect of ST. 5.0.16
 * v5.0, 2021-10-03, Actions: Create source tar lik srs-server-5.0.14.tar.gz
diff --git a/trunk/src/core/srs_core_version5.hpp b/trunk/src/core/srs_core_version5.hpp
index 5b26c3add..358224cca 100644
--- a/trunk/src/core/srs_core_version5.hpp
+++ b/trunk/src/core/srs_core_version5.hpp
@@ -9,6 +9,6 @@
 
 #define VERSION_MAJOR       5
 #define VERSION_MINOR       0
-#define VERSION_REVISION    17
+#define VERSION_REVISION    18
 
 #endif