--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/third_party/libuv/src/unix/loop.c	Wed Jan 14 19:39:52 2026 -0800
@@ -0,0 +1,240 @@
+/* Copyright Joyent, Inc. and other Node contributors. All rights reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to
+ * deal in the Software without restriction, including without limitation the
+ * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+ * sell copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ */
+
+#include "uv.h"
+#include "uv/tree.h"
+#include "internal.h"
+#include "heap-inl.h"
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+int uv_loop_init(uv_loop_t* loop) {
+  uv__loop_internal_fields_t* lfields;
+  void* saved_data;
+  int err;
+
+  saved_data = loop->data;
+  memset(loop, 0, sizeof(*loop));
+  loop->data = saved_data;
+
+  lfields = uv__calloc(1, sizeof(*lfields));
+  if (lfields == NULL)
+    return UV_ENOMEM;
+  loop->internal_fields = lfields;
+
+  err = uv_mutex_init(&lfields->loop_metrics.lock);
+  if (err)
+    goto fail_metrics_mutex_init;
+  memset(&lfields->loop_metrics.metrics,
+         0,
+         sizeof(lfields->loop_metrics.metrics));
+
+  heap_init((struct heap*) &loop->timer_heap);
+  uv__queue_init(&loop->wq);
+  uv__queue_init(&loop->idle_handles);
+  uv__queue_init(&loop->async_handles);
+  uv__queue_init(&loop->check_handles);
+  uv__queue_init(&loop->prepare_handles);
+  uv__queue_init(&loop->handle_queue);
+
+  loop->active_handles = 0;
+  loop->active_reqs.count = 0;
+  loop->nfds = 0;
+  loop->watchers = NULL;
+  loop->nwatchers = 0;
+  uv__queue_init(&loop->pending_queue);
+  uv__queue_init(&loop->watcher_queue);
+
+  loop->closing_handles = NULL;
+  uv__update_time(loop);
+  loop->async_io_watcher.fd = -1;
+  loop->async_wfd = -1;
+  loop->signal_pipefd[0] = -1;
+  loop->signal_pipefd[1] = -1;
+  loop->backend_fd = -1;
+  loop->emfile_fd = -1;
+
+  loop->timer_counter = 0;
+  loop->stop_flag = 0;
+
+  err = uv__platform_loop_init(loop);
+  if (err)
+    goto fail_platform_init;
+
+  uv__signal_global_once_init();
+  err = uv__process_init(loop);
+  if (err)
+    goto fail_signal_init;
+  uv__queue_init(&loop->process_handles);
+
+  err = uv_rwlock_init(&loop->cloexec_lock);
+  if (err)
+    goto fail_rwlock_init;
+
+  err = uv_mutex_init(&loop->wq_mutex);
+  if (err)
+    goto fail_mutex_init;
+
+  err = uv_async_init(loop, &loop->wq_async, uv__work_done);
+  if (err)
+    goto fail_async_init;
+
+  uv__handle_unref(&loop->wq_async);
+  loop->wq_async.flags |= UV_HANDLE_INTERNAL;
+
+  return 0;
+
+fail_async_init:
+  uv_mutex_destroy(&loop->wq_mutex);
+
+fail_mutex_init:
+  uv_rwlock_destroy(&loop->cloexec_lock);
+
+fail_rwlock_init:
+  uv__signal_loop_cleanup(loop);
+
+fail_signal_init:
+  uv__platform_loop_delete(loop);
+
+  if (loop->backend_fd != -1) {
+    uv__close(loop->backend_fd);
+    loop->backend_fd = -1;
+  }
+
+fail_platform_init:
+  uv_mutex_destroy(&lfields->loop_metrics.lock);
+
+fail_metrics_mutex_init:
+  uv__free(lfields);
+  loop->internal_fields = NULL;
+
+  uv__free(loop->watchers);
+  loop->nwatchers = 0;
+  return err;
+}
+
+
+int uv_loop_fork(uv_loop_t* loop) {
+  int err;
+  unsigned int i;
+  uv__io_t* w;
+
+  err = uv__io_fork(loop);
+  if (err)
+    return err;
+
+  err = uv__async_fork(loop);
+  if (err)
+    return err;
+
+  err = uv__signal_loop_fork(loop);
+  if (err)
+    return err;
+
+  /* Rearm all the watchers that aren't re-queued by the above. */
+  for (i = 0; i < loop->nwatchers; i++) {
+    w = loop->watchers[i];
+    if (w == NULL)
+      continue;
+
+    if (w->pevents != 0 && uv__queue_empty(&w->watcher_queue)) {
+      w->events = 0; /* Force re-registration in uv__io_poll. */
+      uv__queue_insert_tail(&loop->watcher_queue, &w->watcher_queue);
+    }
+  }
+
+  return 0;
+}
+
+
+void uv__loop_close(uv_loop_t* loop) {
+  uv__loop_internal_fields_t* lfields;
+
+  uv__signal_loop_cleanup(loop);
+  uv__platform_loop_delete(loop);
+  uv__async_stop(loop);
+
+  if (loop->emfile_fd != -1) {
+    uv__close(loop->emfile_fd);
+    loop->emfile_fd = -1;
+  }
+
+  if (loop->backend_fd != -1) {
+    uv__close(loop->backend_fd);
+    loop->backend_fd = -1;
+  }
+
+  uv_mutex_lock(&loop->wq_mutex);
+  assert(uv__queue_empty(&loop->wq) && "thread pool work queue not empty!");
+  assert(!uv__has_active_reqs(loop));
+  uv_mutex_unlock(&loop->wq_mutex);
+  uv_mutex_destroy(&loop->wq_mutex);
+
+  /*
+   * Note that all thread pool stuff is finished at this point and
+   * it is safe to just destroy rw lock
+   */
+  uv_rwlock_destroy(&loop->cloexec_lock);
+
+#if 0
+  assert(uv__queue_empty(&loop->pending_queue));
+  assert(uv__queue_empty(&loop->watcher_queue));
+  assert(loop->nfds == 0);
+#endif
+
+  uv__free(loop->watchers);
+  loop->watchers = NULL;
+  loop->nwatchers = 0;
+
+  lfields = uv__get_internal_fields(loop);
+  uv_mutex_destroy(&lfields->loop_metrics.lock);
+  uv__free(lfields);
+  loop->internal_fields = NULL;
+}
+
+
+int uv__loop_configure(uv_loop_t* loop, uv_loop_option option, va_list ap) {
+  uv__loop_internal_fields_t* lfields;
+
+  lfields = uv__get_internal_fields(loop);
+  if (option == UV_METRICS_IDLE_TIME) {
+    lfields->flags |= UV_METRICS_IDLE_TIME;
+    return 0;
+  }
+
+#if defined(__linux__)
+  if (option == UV_LOOP_USE_IO_URING_SQPOLL) {
+    loop->flags |= UV_LOOP_ENABLE_IO_URING_SQPOLL;
+    return 0;
+  }
+#endif
+
+
+  if (option != UV_LOOP_BLOCK_SIGNAL)
+    return UV_ENOSYS;
+
+  if (va_arg(ap, int) != SIGPROF)
+    return UV_EINVAL;
+
+  loop->flags |= UV_LOOP_BLOCK_SIGPROF;
+  return 0;
+}