--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/third_party/libuv/test/test-signal-pending-on-close.c	Wed Jan 14 19:39:52 2026 -0800
@@ -0,0 +1,116 @@
+/* Copyright libuv project 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.
+*/
+#ifndef _WIN32
+
+#include "uv.h"
+#include "task.h"
+
+#include <string.h>
+#include <unistd.h>
+
+static uv_loop_t loop;
+static uv_signal_t signal_hdl;
+static uv_pipe_t pipe_hdl;
+static uv_write_t write_req;
+static char* buf;
+static int close_cb_called;
+
+
+static void stop_loop_cb(uv_signal_t* signal, int signum) {
+  ASSERT_EQ(signum, SIGPIPE);
+  uv_stop(signal->loop);
+}
+
+static void signal_cb(uv_signal_t* signal, int signum) {
+  ASSERT(0);
+}
+
+static void close_cb(uv_handle_t *handle) {
+  close_cb_called++;
+}
+
+
+static void write_cb(uv_write_t* req, int status) {
+  ASSERT_NOT_NULL(req);
+  ASSERT_EQ(status, UV_EPIPE);
+  free(buf);
+  uv_close((uv_handle_t *) &pipe_hdl, close_cb);
+  uv_close((uv_handle_t *) &signal_hdl, close_cb);
+}
+
+
+TEST_IMPL(signal_pending_on_close) {
+  int pipefds[2];
+  uv_buf_t buffer;
+  int r;
+
+  ASSERT_OK(uv_loop_init(&loop));
+
+  ASSERT_OK(uv_signal_init(&loop, &signal_hdl));
+
+  ASSERT_OK(uv_signal_start(&signal_hdl, signal_cb, SIGPIPE));
+
+  ASSERT_OK(pipe(pipefds));
+
+  ASSERT_OK(uv_pipe_init(&loop, &pipe_hdl, 0));
+
+  ASSERT_OK(uv_pipe_open(&pipe_hdl, pipefds[1]));
+
+  /* Write data large enough so it needs loop iteration */
+  buf = malloc(1<<24);
+  ASSERT_NOT_NULL(buf);
+  memset(buf, '.', 1<<24);
+  buffer = uv_buf_init(buf, 1<<24);
+
+  r = uv_write(&write_req, (uv_stream_t *) &pipe_hdl, &buffer, 1, write_cb);
+  ASSERT_OK(r);
+
+  /* cause a SIGPIPE on write in next iteration */
+  close(pipefds[0]);
+
+  ASSERT_OK(uv_run(&loop, UV_RUN_DEFAULT));
+
+  ASSERT_EQ(2, close_cb_called);
+
+  MAKE_VALGRIND_HAPPY(&loop);
+  return 0;
+}
+
+
+TEST_IMPL(signal_close_loop_alive) {
+  ASSERT_OK(uv_loop_init(&loop));
+  ASSERT_OK(uv_signal_init(&loop, &signal_hdl));
+  ASSERT_OK(uv_signal_start(&signal_hdl, stop_loop_cb, SIGPIPE));
+  uv_unref((uv_handle_t*) &signal_hdl);
+
+  ASSERT_OK(uv_kill(uv_os_getpid(), SIGPIPE));
+  ASSERT_OK(uv_run(&loop, UV_RUN_DEFAULT));
+  uv_close((uv_handle_t*) &signal_hdl, close_cb);
+  ASSERT_EQ(1, uv_loop_alive(&loop));
+
+  ASSERT_OK(uv_run(&loop, UV_RUN_DEFAULT));
+  ASSERT_EQ(1, close_cb_called);
+
+  MAKE_VALGRIND_HAPPY(&loop);
+  return 0;
+}
+
+#endif