test: add addon tests for RegisterSignalHandler()

Ensure coverage for the different combinations of arguments.

test/abort/test-addon-register-signal-handler.js

@@ -0,0 +1,7 @@
+'use strict';
+require('../common');
+
+// This is a sibling test to test/addons/register-signal-handler/
+
+process.env.ALLOW_CRASHES = true;
+require('../addons/register-signal-handler/test');

test/addons/register-signal-handler/binding.cc

@@ -0,0 +1,36 @@
+#ifndef _WIN32
+#include <node.h>
+#include <v8.h>
+#include <uv.h>
+#include <assert.h>
+#include <unistd.h>
+
+using v8::Boolean;
+using v8::FunctionCallbackInfo;
+using v8::Int32;
+using v8::Value;
+
+void Handler(int signo, siginfo_t* siginfo, void* ucontext) {
+  char signo_char = signo;
+  int written;
+  do {
+    written = write(1, &signo_char, 1);  // write() is signal-safe.
+  } while (written == -1 && errno == EINTR);
+  assert(written == 1);
+}
+
+void RegisterSignalHandler(const FunctionCallbackInfo<Value>& args) {
+  assert(args[0]->IsInt32());
+  assert(args[1]->IsBoolean());
+
+  int32_t signo = args[0].As<Int32>()->Value();
+  bool reset_handler = args[1].As<Boolean>()->Value();
+
+  node::RegisterSignalHandler(signo, Handler, reset_handler);
+}
+
+NODE_MODULE_INIT() {
+  NODE_SET_METHOD(exports, "registerSignalHandler", RegisterSignalHandler);
+}
+
+#endif  // _WIN32

test/addons/register-signal-handler/binding.gyp

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+{
+  'targets': [
+    {
+      'target_name': 'binding',
+      'sources': [ 'binding.cc' ],
+      'includes': ['../common.gypi'],
+    }
+  ]
+}

test/addons/register-signal-handler/test.js

@@ -0,0 +1,56 @@
+'use strict';
+const common = require('../../common');
+if (common.isWindows)
+  common.skip('No RegisterSignalHandler() on Windows');
+
+const assert = require('assert');
+const fs = require('fs');
+const path = require('path');
+const { signals } = require('os').constants;
+const { spawnSync } = require('child_process');
+
+const bindingPath = path.resolve(
+  __dirname, 'build', common.buildType, 'binding.node');
+
+if (!fs.existsSync(bindingPath))
+  common.skip('binding not built yet');
+
+const binding = require(bindingPath);
+
+if (process.argv[2] === 'child') {
+  const signo = +process.argv[3];
+  const reset = process.argv[4] === 'reset';
+  const count = +process.argv[5];
+
+  binding.registerSignalHandler(signo, reset);
+  for (let i = 0; i < count; i++)
+    process.kill(process.pid, signo);
+  return;
+}
+
+for (const raiseSignal of [ 'SIGABRT', 'SIGSEGV' ]) {
+  const signo = signals[raiseSignal];
+  for (const { reset, count, stderr, code, signal } of [
+    { reset: true, count: 1, stderr: [signo], code: 0, signal: null },
+    { reset: true, count: 2, stderr: [signo], code: null, signal: raiseSignal },
+    { reset: false, count: 1, stderr: [signo], code: 0, signal: null },
+    { reset: false, count: 2, stderr: [signo, signo], code: 0, signal: null }
+  ]) {
+    // We do not want to generate core files when running this test as an
+    // addon test. We require this file as an abort test as well, though,
+    // with ALLOW_CRASHES set.
+    if (signal !== null && !process.env.ALLOW_CRASHES)
+      continue;
+    // reset_handler does not work with SIGSEGV.
+    if (reset && signo === signals.SIGSEGV)
+      continue;
+
+    const args = [__filename, 'child', signo, reset ? 'reset' : '', count];
+    console.log(`Running: node ${args.join(' ')}`);
+    const result = spawnSync(
+      process.execPath, args, { stdio: ['inherit', 'pipe', 'inherit'] });
+    assert.strictEqual(result.status, code);
+    assert.strictEqual(result.signal, signal);
+    assert.deepStrictEqual([...result.stdout], stderr);
+  }
+}