--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/third_party/libuv/test/test-signal.c	Wed Jan 14 19:39:52 2026 -0800
@@ -0,0 +1,325 @@
+/* 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"
+
+#ifndef _WIN32
+#include <unistd.h>
+#endif
+
+TEST_IMPL(kill_invalid_signum) {
+  uv_pid_t pid;
+
+  pid = uv_os_getpid();
+
+  ASSERT_EQ(uv_kill(pid, -1), UV_EINVAL);
+#ifdef _WIN32
+  /* NSIG is not available on all platforms. */
+  ASSERT_EQ(uv_kill(pid, NSIG), UV_EINVAL);
+#endif
+  ASSERT_EQ(uv_kill(pid, 4096), UV_EINVAL);
+
+  MAKE_VALGRIND_HAPPY(uv_default_loop());
+  return 0;
+}
+
+/* For Windows we test only signum handling */
+#ifdef _WIN32
+static void signum_test_cb(uv_signal_t* handle, int signum) {
+  FATAL("signum_test_cb should not be called");
+}
+
+TEST_IMPL(win32_signum_number) {
+  uv_signal_t signal;
+  uv_loop_t* loop;
+
+  loop = uv_default_loop();
+  uv_signal_init(loop, &signal);
+
+  ASSERT_EQ(uv_signal_start(&signal, signum_test_cb, 0), UV_EINVAL);
+  ASSERT_OK(uv_signal_start(&signal, signum_test_cb, SIGINT));
+  ASSERT_OK(uv_signal_start(&signal, signum_test_cb, SIGBREAK));
+  ASSERT_OK(uv_signal_start(&signal, signum_test_cb, SIGHUP));
+  ASSERT_OK(uv_signal_start(&signal, signum_test_cb, SIGWINCH));
+  ASSERT_OK(uv_signal_start(&signal, signum_test_cb, SIGILL));
+  ASSERT_OK(uv_signal_start(&signal, signum_test_cb, SIGABRT_COMPAT));
+  ASSERT_OK(uv_signal_start(&signal, signum_test_cb, SIGFPE));
+  ASSERT_OK(uv_signal_start(&signal, signum_test_cb, SIGSEGV));
+  ASSERT_OK(uv_signal_start(&signal, signum_test_cb, SIGTERM));
+  ASSERT_OK(uv_signal_start(&signal, signum_test_cb, SIGABRT));
+  ASSERT_EQ(uv_signal_start(&signal, signum_test_cb, -1), UV_EINVAL);
+  ASSERT_EQ(uv_signal_start(&signal, signum_test_cb, NSIG), UV_EINVAL);
+  ASSERT_EQ(uv_signal_start(&signal, signum_test_cb, 1024), UV_EINVAL);
+  MAKE_VALGRIND_HAPPY(loop);
+  return 0;
+}
+#else
+#include <errno.h>
+#include <signal.h>
+#include <stdarg.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#define NSIGNALS  10
+
+struct timer_ctx {
+  unsigned int ncalls;
+  uv_timer_t handle;
+  int signum;
+};
+
+struct signal_ctx {
+  enum { CLOSE, STOP, NOOP } stop_or_close;
+  unsigned int ncalls;
+  uv_signal_t handle;
+  int signum;
+  int one_shot;
+};
+
+
+static void signal_cb(uv_signal_t* handle, int signum) {
+  struct signal_ctx* ctx = container_of(handle, struct signal_ctx, handle);
+  ASSERT_EQ(signum, ctx->signum);
+  if (++ctx->ncalls == NSIGNALS) {
+    if (ctx->stop_or_close == STOP)
+      uv_signal_stop(handle);
+    else if (ctx->stop_or_close == CLOSE)
+      uv_close((uv_handle_t*)handle, NULL);
+    else
+      ASSERT(0);
+  }
+}
+
+static void signal_cb_one_shot(uv_signal_t* handle, int signum) {
+  struct signal_ctx* ctx = container_of(handle, struct signal_ctx, handle);
+  ASSERT_EQ(signum, ctx->signum);
+  ASSERT_EQ(1, ++ctx->ncalls);
+  if (ctx->stop_or_close == CLOSE)
+    uv_close((uv_handle_t*)handle, NULL);
+}
+
+
+static void timer_cb(uv_timer_t* handle) {
+  struct timer_ctx* ctx = container_of(handle, struct timer_ctx, handle);
+
+  raise(ctx->signum);
+
+  if (++ctx->ncalls == NSIGNALS)
+    uv_close((uv_handle_t*)handle, NULL);
+}
+
+
+static void start_watcher(uv_loop_t* loop,
+                          int signum,
+                          struct signal_ctx* ctx,
+                          int one_shot) {
+  ctx->ncalls = 0;
+  ctx->signum = signum;
+  ctx->stop_or_close = CLOSE;
+  ctx->one_shot = one_shot;
+  ASSERT_OK(uv_signal_init(loop, &ctx->handle));
+  if (one_shot)
+    ASSERT_OK(uv_signal_start_oneshot(&ctx->handle, signal_cb_one_shot, signum));
+  else
+    ASSERT_OK(uv_signal_start(&ctx->handle, signal_cb, signum));
+}
+
+static void start_timer(uv_loop_t* loop, int signum, struct timer_ctx* ctx) {
+  ctx->ncalls = 0;
+  ctx->signum = signum;
+  ASSERT_OK(uv_timer_init(loop, &ctx->handle));
+  ASSERT_OK(uv_timer_start(&ctx->handle, timer_cb, 5, 5));
+}
+
+
+TEST_IMPL(we_get_signal) {
+  struct signal_ctx sc;
+  struct timer_ctx tc;
+  uv_loop_t* loop;
+
+  loop = uv_default_loop();
+  start_timer(loop, SIGCHLD, &tc);
+  start_watcher(loop, SIGCHLD, &sc, 0);
+  sc.stop_or_close = STOP; /* stop, don't close the signal handle */
+  ASSERT_OK(uv_run(loop, UV_RUN_DEFAULT));
+  ASSERT_EQ(tc.ncalls, NSIGNALS);
+  ASSERT_EQ(sc.ncalls, NSIGNALS);
+
+  start_timer(loop, SIGCHLD, &tc);
+  ASSERT_OK(uv_run(loop, UV_RUN_DEFAULT));
+  ASSERT_EQ(tc.ncalls, NSIGNALS);
+  ASSERT_EQ(sc.ncalls, NSIGNALS);
+
+  sc.ncalls = 0;
+  sc.stop_or_close = CLOSE; /* now close it when it's done */
+  uv_signal_start(&sc.handle, signal_cb, SIGCHLD);
+
+  start_timer(loop, SIGCHLD, &tc);
+  ASSERT_OK(uv_run(loop, UV_RUN_DEFAULT));
+  ASSERT_EQ(tc.ncalls, NSIGNALS);
+  ASSERT_EQ(sc.ncalls, NSIGNALS);
+
+  MAKE_VALGRIND_HAPPY(loop);
+  return 0;
+}
+
+
+TEST_IMPL(we_get_signals) {
+  struct signal_ctx sc[4];
+  struct timer_ctx tc[2];
+  uv_loop_t* loop;
+  unsigned int i;
+
+  loop = uv_default_loop();
+  start_watcher(loop, SIGUSR1, sc + 0, 0);
+  start_watcher(loop, SIGUSR1, sc + 1, 0);
+  start_watcher(loop, SIGUSR2, sc + 2, 0);
+  start_watcher(loop, SIGUSR2, sc + 3, 0);
+  start_timer(loop, SIGUSR1, tc + 0);
+  start_timer(loop, SIGUSR2, tc + 1);
+  ASSERT_OK(uv_run(loop, UV_RUN_DEFAULT));
+
+  for (i = 0; i < ARRAY_SIZE(sc); i++)
+    ASSERT_EQ(sc[i].ncalls, NSIGNALS);
+
+  for (i = 0; i < ARRAY_SIZE(tc); i++)
+    ASSERT_EQ(tc[i].ncalls, NSIGNALS);
+
+  MAKE_VALGRIND_HAPPY(loop);
+  return 0;
+}
+
+TEST_IMPL(we_get_signal_one_shot) {
+  struct signal_ctx sc;
+  struct timer_ctx tc;
+  uv_loop_t* loop;
+
+  loop = uv_default_loop();
+  start_timer(loop, SIGCHLD, &tc);
+  start_watcher(loop, SIGCHLD, &sc, 1);
+  sc.stop_or_close = NOOP;
+  ASSERT_OK(uv_run(loop, UV_RUN_DEFAULT));
+  ASSERT_EQ(tc.ncalls, NSIGNALS);
+  ASSERT_EQ(1, sc.ncalls);
+
+  start_timer(loop, SIGCHLD, &tc);
+  ASSERT_OK(uv_run(loop, UV_RUN_DEFAULT));
+  ASSERT_EQ(1, sc.ncalls);
+
+  sc.ncalls = 0;
+  sc.stop_or_close = CLOSE; /* now close it when it's done */
+  uv_signal_start_oneshot(&sc.handle, signal_cb_one_shot, SIGCHLD);
+  start_timer(loop, SIGCHLD, &tc);
+  ASSERT_OK(uv_run(loop, UV_RUN_DEFAULT));
+  ASSERT_EQ(tc.ncalls, NSIGNALS);
+  ASSERT_EQ(1, sc.ncalls);
+
+  MAKE_VALGRIND_HAPPY(loop);
+  return 0;
+}
+
+TEST_IMPL(we_get_signals_mixed) {
+  struct signal_ctx sc[4];
+  struct timer_ctx tc;
+  uv_loop_t* loop;
+
+  loop = uv_default_loop();
+
+  /* 2 one-shot */
+  start_timer(loop, SIGCHLD, &tc);
+  start_watcher(loop, SIGCHLD, sc + 0, 1);
+  start_watcher(loop, SIGCHLD, sc + 1, 1);
+  sc[0].stop_or_close = CLOSE;
+  sc[1].stop_or_close = CLOSE;
+  ASSERT_OK(uv_run(loop, UV_RUN_DEFAULT));
+  ASSERT_EQ(tc.ncalls, NSIGNALS);
+  ASSERT_EQ(1, sc[0].ncalls);
+  ASSERT_EQ(1, sc[1].ncalls);
+
+  /* 2 one-shot, 1 normal then remove normal */
+  start_timer(loop, SIGCHLD, &tc);
+  start_watcher(loop, SIGCHLD, sc + 0, 1);
+  start_watcher(loop, SIGCHLD, sc + 1, 1);
+  sc[0].stop_or_close = CLOSE;
+  sc[1].stop_or_close = CLOSE;
+  start_watcher(loop, SIGCHLD, sc + 2, 0);
+  uv_close((uv_handle_t*)&(sc[2]).handle, NULL);
+  ASSERT_OK(uv_run(loop, UV_RUN_DEFAULT));
+  ASSERT_EQ(tc.ncalls, NSIGNALS);
+  ASSERT_EQ(1, sc[0].ncalls);
+  ASSERT_EQ(1, sc[1].ncalls);
+  ASSERT_OK(sc[2].ncalls);
+
+  /* 2 normal, 1 one-shot then remove one-shot */
+  start_timer(loop, SIGCHLD, &tc);
+  start_watcher(loop, SIGCHLD, sc + 0, 0);
+  start_watcher(loop, SIGCHLD, sc + 1, 0);
+  sc[0].stop_or_close = CLOSE;
+  sc[1].stop_or_close = CLOSE;
+  start_watcher(loop, SIGCHLD, sc + 2, 1);
+  uv_close((uv_handle_t*)&(sc[2]).handle, NULL);
+  ASSERT_OK(uv_run(loop, UV_RUN_DEFAULT));
+  ASSERT_EQ(tc.ncalls, NSIGNALS);
+  ASSERT_EQ(sc[0].ncalls, NSIGNALS);
+  ASSERT_EQ(sc[1].ncalls, NSIGNALS);
+  ASSERT_OK(sc[2].ncalls);
+
+  /* 2 normal, 2 one-shot then remove 2 normal */
+  start_timer(loop, SIGCHLD, &tc);
+  start_watcher(loop, SIGCHLD, sc + 0, 0);
+  start_watcher(loop, SIGCHLD, sc + 1, 0);
+  start_watcher(loop, SIGCHLD, sc + 2, 1);
+  start_watcher(loop, SIGCHLD, sc + 3, 1);
+  sc[2].stop_or_close = CLOSE;
+  sc[3].stop_or_close = CLOSE;
+  uv_close((uv_handle_t*)&(sc[0]).handle, NULL);
+  uv_close((uv_handle_t*)&(sc[1]).handle, NULL);
+  ASSERT_OK(uv_run(loop, UV_RUN_DEFAULT));
+  ASSERT_EQ(tc.ncalls, NSIGNALS);
+  ASSERT_OK(sc[0].ncalls);
+  ASSERT_OK(sc[1].ncalls);
+  ASSERT_EQ(1, sc[2].ncalls);
+  ASSERT_EQ(1, sc[2].ncalls);
+
+  /* 1 normal, 1 one-shot, 2 normal then remove 1st normal, 2nd normal */
+  start_timer(loop, SIGCHLD, &tc);
+  start_watcher(loop, SIGCHLD, sc + 0, 0);
+  start_watcher(loop, SIGCHLD, sc + 1, 1);
+  start_watcher(loop, SIGCHLD, sc + 2, 0);
+  start_watcher(loop, SIGCHLD, sc + 3, 0);
+  sc[3].stop_or_close = CLOSE;
+  uv_close((uv_handle_t*)&(sc[0]).handle, NULL);
+  uv_close((uv_handle_t*)&(sc[2]).handle, NULL);
+  ASSERT_OK(uv_run(loop, UV_RUN_DEFAULT));
+  ASSERT_EQ(tc.ncalls, NSIGNALS);
+  ASSERT_OK(sc[0].ncalls);
+  ASSERT_EQ(1, sc[1].ncalls);
+  ASSERT_OK(sc[2].ncalls);
+  ASSERT_EQ(sc[3].ncalls, NSIGNALS);
+
+  MAKE_VALGRIND_HAPPY(loop);
+  return 0;
+}
+
+#endif /* _WIN32 */