--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/third_party/libuv/test/test-osx-select.c	Wed Jan 14 19:39:52 2026 -0800
@@ -0,0 +1,140 @@
+/* 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 "task.h"
+
+#ifdef __APPLE__
+
+#include <sys/ioctl.h>
+#include <string.h>
+
+static int read_count;
+
+
+static void alloc_cb(uv_handle_t* handle, size_t size, uv_buf_t* buf) {
+  static char slab[1024];
+  buf->base = slab;
+  buf->len = sizeof(slab);
+}
+
+
+static void read_cb(uv_stream_t* stream, ssize_t nread, const uv_buf_t* buf) {
+  fprintf(stdout, "got data %d\n", ++read_count);
+  fflush(stdout);
+
+  if (read_count == 3)
+    uv_close((uv_handle_t*) stream, NULL);
+}
+
+
+TEST_IMPL(osx_select) {
+  int r;
+  int fd;
+  size_t i;
+  size_t len;
+  const char* str;
+  uv_tty_t tty;
+
+  fd = open("/dev/tty", O_RDONLY);
+  if (fd < 0) {
+    fprintf(stderr, "Cannot open /dev/tty as read-only: %s\n", strerror(errno));
+    fflush(stderr);
+    return TEST_SKIP;
+  }
+
+  r = uv_tty_init(uv_default_loop(), &tty, fd, 1);
+  ASSERT_OK(r);
+
+  uv_read_start((uv_stream_t*) &tty, alloc_cb, read_cb);
+
+  /* Emulate user-input */
+  str = "got some input\n"
+        "with a couple of lines\n"
+        "feel pretty happy\n";
+  for (i = 0, len = strlen(str); i < len; i++) {
+    r = ioctl(fd, TIOCSTI, str + i);
+    ASSERT_OK(r);
+  }
+
+  uv_run(uv_default_loop(), UV_RUN_DEFAULT);
+
+  ASSERT_EQ(3, read_count);
+
+  MAKE_VALGRIND_HAPPY(uv_default_loop());
+  return 0;
+}
+
+
+TEST_IMPL(osx_select_many_fds) {
+  int r;
+  int fd;
+  size_t i;
+  size_t len;
+  const char* str;
+  struct sockaddr_in addr;
+  uv_tty_t tty;
+  uv_tcp_t tcps[1500];
+
+  TEST_FILE_LIMIT(ARRAY_SIZE(tcps) + 100);
+
+  r = uv_ip4_addr("127.0.0.1", 0, &addr);
+  ASSERT_OK(r);
+
+  for (i = 0; i < ARRAY_SIZE(tcps); i++) {
+    r = uv_tcp_init(uv_default_loop(), &tcps[i]);
+    ASSERT_OK(r);
+    r = uv_tcp_bind(&tcps[i], (const struct sockaddr *) &addr, 0);
+    ASSERT_OK(r);
+    uv_unref((uv_handle_t*) &tcps[i]);
+  }
+
+  fd = open("/dev/tty", O_RDONLY);
+  if (fd < 0) {
+    fprintf(stderr, "Cannot open /dev/tty as read-only: %s\n", strerror(errno));
+    fflush(stderr);
+    return TEST_SKIP;
+  }
+
+  r = uv_tty_init(uv_default_loop(), &tty, fd, 1);
+  ASSERT_OK(r);
+
+  r = uv_read_start((uv_stream_t*) &tty, alloc_cb, read_cb);
+  ASSERT_OK(r);
+
+  /* Emulate user-input */
+  str = "got some input\n"
+        "with a couple of lines\n"
+        "feel pretty happy\n";
+  for (i = 0, len = strlen(str); i < len; i++) {
+    r = ioctl(fd, TIOCSTI, str + i);
+    ASSERT_OK(r);
+  }
+
+  uv_run(uv_default_loop(), UV_RUN_DEFAULT);
+
+  ASSERT_EQ(3, read_count);
+
+  MAKE_VALGRIND_HAPPY(uv_default_loop());
+  return 0;
+}
+
+#endif /* __APPLE__ */