1 files changed, 137 insertions, 0 deletions
diff --git a/ipc/glue/ProcessChild.cpp b/ipc/glue/ProcessChild.cpp
new file mode 100644
index 0000000000..7a8a74cc1e
--- /dev/null
+++ b/ipc/glue/ProcessChild.cpp
@@ -0,0 +1,137 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "mozilla/ipc/ProcessChild.h"
+
+#include "Endpoint.h"
+#include "nsDebug.h"
+
+#ifdef XP_WIN
+#  include <stdlib.h>  // for _exit()
+#  include <synchapi.h>
+#else
+#  include <unistd.h>  // for _exit()
+#  include <time.h>
+#  include "base/eintr_wrapper.h"
+#  include "prenv.h"
+#endif
+
+#include "nsAppRunner.h"
+#include "mozilla/AppShutdown.h"
+#include "mozilla/ipc/CrashReporterClient.h"
+#include "mozilla/ipc/IOThreadChild.h"
+#include "mozilla/GeckoArgs.h"
+
+namespace mozilla {
+namespace ipc {
+
+ProcessChild* ProcessChild::gProcessChild;
+
+static Atomic<bool> sExpectingShutdown(false);
+
+ProcessChild::ProcessChild(ProcessId aParentPid, const nsID& aMessageChannelId)
+    : ChildProcess(new IOThreadChild()),
+      mUILoop(MessageLoop::current()),
+      mParentPid(aParentPid),
+      mMessageChannelId(aMessageChannelId) {
+  MOZ_ASSERT(mUILoop, "UILoop should be created by now");
+  MOZ_ASSERT(!gProcessChild, "should only be one ProcessChild");
+  gProcessChild = this;
+}
+
+/* static */
+void ProcessChild::AddPlatformBuildID(std::vector<std::string>& aExtraArgs) {
+  nsCString parentBuildID(mozilla::PlatformBuildID());
+  geckoargs::sParentBuildID.Put(parentBuildID.get(), aExtraArgs);
+}
+
+/* static */
+bool ProcessChild::InitPrefs(int aArgc, char* aArgv[]) {
+  Maybe<uint64_t> prefsHandle = Some(0);
+  Maybe<uint64_t> prefMapHandle = Some(0);
+  Maybe<uint64_t> prefsLen = geckoargs::sPrefsLen.Get(aArgc, aArgv);
+  Maybe<uint64_t> prefMapSize = geckoargs::sPrefMapSize.Get(aArgc, aArgv);
+
+  if (prefsLen.isNothing() || prefMapSize.isNothing()) {
+    return false;
+  }
+
+#ifdef XP_WIN
+  prefsHandle = geckoargs::sPrefsHandle.Get(aArgc, aArgv);
+  prefMapHandle = geckoargs::sPrefMapHandle.Get(aArgc, aArgv);
+
+  if (prefsHandle.isNothing() || prefMapHandle.isNothing()) {
+    return false;
+  }
+#endif
+
+  SharedPreferenceDeserializer deserializer;
+  return deserializer.DeserializeFromSharedMemory(*prefsHandle, *prefMapHandle,
+                                                  *prefsLen, *prefMapSize);
+}
+
+#ifdef ENABLE_TESTS
+// Allow tests to cause a synthetic delay/"hang" during child process
+// shutdown by setting environment variables.
+#  ifdef XP_UNIX
+static void ReallySleep(int aSeconds) {
+  struct ::timespec snooze = {aSeconds, 0};
+  HANDLE_EINTR(nanosleep(&snooze, &snooze));
+}
+#  elif defined(XP_WIN)
+static void ReallySleep(int aSeconds) { ::Sleep(aSeconds * 1000); }
+#  endif  // Unix/Win
+static void SleepIfEnv(const char* aName) {
+  if (auto* value = PR_GetEnv(aName)) {
+    ReallySleep(atoi(value));
+  }
+}
+#else  // not tests
+static void SleepIfEnv(const char* aName) {}
+#endif
+
+ProcessChild::~ProcessChild() {
+#ifdef NS_FREE_PERMANENT_DATA
+  // In this case, we won't early-exit and we'll wait indefinitely for
+  // child processes to terminate.  This sleep is late enough that, in
+  // content processes, it won't block parent process shutdown, so
+  // we'll get into late IPC shutdown with processes still running.
+  SleepIfEnv("MOZ_TEST_CHILD_EXIT_HANG");
+#endif
+  gProcessChild = nullptr;
+}
+
+/* static */
+void ProcessChild::NotifiedImpendingShutdown() {
+  sExpectingShutdown = true;
+  CrashReporter::AppendToCrashReportAnnotation(
+      CrashReporter::Annotation::IPCShutdownState,
+      "NotifiedImpendingShutdown"_ns);
+}
+
+/* static */
+bool ProcessChild::ExpectingShutdown() { return sExpectingShutdown; }
+
+/* static */
+void ProcessChild::QuickExit() {
+#ifndef NS_FREE_PERMANENT_DATA
+  // In this case, we're going to terminate the child process before
+  // we get to ~ProcessChild above (and terminate the parent process
+  // before the shutdown hook in ProcessWatcher).  Instead, blocking
+  // earlier will let us exercise ProcessWatcher's kill timer.
+  SleepIfEnv("MOZ_TEST_CHILD_EXIT_HANG");
+#endif
+  AppShutdown::DoImmediateExit();
+}
+
+UntypedEndpoint ProcessChild::TakeInitialEndpoint() {
+  return UntypedEndpoint{PrivateIPDLInterface{},
+                         child_thread()->TakeInitialPort(), mMessageChannelId,
+                         base::GetCurrentProcId(), mParentPid};
+}
+
+}  // namespace ipc
+}  // namespace mozilla