Merge branch 'upstream-libuv' into update-libuv

* upstream-libuv:
  libuv 2017-05-09 (e11dcd43)

Fixes: #16878

1 files changed, 35 insertions, 1 deletions

diff --git a/Utilities/cmlibuv/src/unix/kqueue.c b/Utilities/cmlibuv/src/unix/kqueue.c
index fffd462..6bc60bb 100644
--- a/Utilities/cmlibuv/src/unix/kqueue.c
+++ b/Utilities/cmlibuv/src/unix/kqueue.c
@@ -48,6 +48,37 @@ int uv__kqueue_init(uv_loop_t* loop) {
 }
 
 
+static int uv__has_forked_with_cfrunloop;
+
+int uv__io_fork(uv_loop_t* loop) {
+  int err;
+  uv__close(loop->backend_fd);
+  loop->backend_fd = -1;
+  err = uv__kqueue_init(loop);
+  if (err)
+    return err;
+
+#if defined(__APPLE__)
+  if (loop->cf_state != NULL) {
+    /* We cannot start another CFRunloop and/or thread in the child
+       process; CF aborts if you try or if you try to touch the thread
+       at all to kill it. So the best we can do is ignore it from now
+       on. This means we can't watch directories in the same way
+       anymore (like other BSDs). It also means we cannot properly
+       clean up the allocated resources; calling
+       uv__fsevents_loop_delete from uv_loop_close will crash the
+       process. So we sidestep the issue by pretending like we never
+       started it in the first place.
+    */
+    uv__has_forked_with_cfrunloop = 1;
+    uv__free(loop->cf_state);
+    loop->cf_state = NULL;
+  }
+#endif
+  return err;
+}
+
+
 int uv__io_check_fd(uv_loop_t* loop, int fd) {
   struct kevent ev;
   int rc;
@@ -404,6 +435,9 @@ int uv_fs_event_start(uv_fs_event_t* handle,
   handle->cb = cb;
 
 #if defined(__APPLE__)
+  if (uv__has_forked_with_cfrunloop)
+    goto fallback;
+
   /* Nullify field to perform checks later */
   handle->cf_cb = NULL;
   handle->realpath = NULL;
@@ -438,7 +472,7 @@ int uv_fs_event_stop(uv_fs_event_t* handle) {
   uv__handle_stop(handle);
 
 #if defined(__APPLE__)
-  if (uv__fsevents_close(handle))
+  if (uv__has_forked_with_cfrunloop || uv__fsevents_close(handle))
 #endif /* defined(__APPLE__) */
   {
     uv__io_close(handle->loop, &handle->event_watcher);