abe7f841ca
Backed out changeset 3e8d2c47138c (bug 1454816) Backed out changeset 80ff20241831 (bug 1454816) Backed out changeset 28c2d6d2a683 (bug 1454816) Backed out changeset 236943ab4142 (bug 1454816)
139 lines
4.6 KiB
C++
139 lines
4.6 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "mozilla/ipc/ProcessChild.h"
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#include "Endpoint.h"
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#include "nsDebug.h"
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#ifdef XP_WIN
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# include <stdlib.h> // for _exit()
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# include <synchapi.h>
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#else
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# include <unistd.h> // for _exit()
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# include <time.h>
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# include "base/eintr_wrapper.h"
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# include "prenv.h"
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#endif
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#include "nsAppRunner.h"
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#include "mozilla/AppShutdown.h"
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#include "mozilla/ipc/IOThreadChild.h"
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#include "mozilla/GeckoArgs.h"
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namespace mozilla {
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namespace ipc {
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ProcessChild* ProcessChild::gProcessChild;
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StaticMutex ProcessChild::gIPCShutdownStateLock;
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nsCString ProcessChild::gIPCShutdownStateAnnotation;
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static Atomic<bool> sExpectingShutdown(false);
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ProcessChild::ProcessChild(IPC::Channel::ChannelHandle aClientChannel,
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ProcessId aParentPid, const nsID& aMessageChannelId)
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: ChildProcess(new IOThreadChild(std::move(aClientChannel), aParentPid)),
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mUILoop(MessageLoop::current()),
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mParentPid(aParentPid),
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mMessageChannelId(aMessageChannelId) {
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MOZ_ASSERT(mUILoop, "UILoop should be created by now");
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MOZ_ASSERT(!gProcessChild, "should only be one ProcessChild");
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CrashReporter::RegisterAnnotationNSCString(
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CrashReporter::Annotation::IPCShutdownState,
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&gIPCShutdownStateAnnotation);
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gProcessChild = this;
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}
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/* static */
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void ProcessChild::AddPlatformBuildID(geckoargs::ChildProcessArgs& aExtraArgs) {
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nsCString parentBuildID(mozilla::PlatformBuildID());
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geckoargs::sParentBuildID.Put(parentBuildID.get(), aExtraArgs);
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}
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/* static */
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bool ProcessChild::InitPrefs(int aArgc, char* aArgv[]) {
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Maybe<UniqueFileHandle> prefsHandle =
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geckoargs::sPrefsHandle.Get(aArgc, aArgv);
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Maybe<UniqueFileHandle> prefMapHandle =
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geckoargs::sPrefMapHandle.Get(aArgc, aArgv);
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Maybe<uint64_t> prefsLen = geckoargs::sPrefsLen.Get(aArgc, aArgv);
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Maybe<uint64_t> prefMapSize = geckoargs::sPrefMapSize.Get(aArgc, aArgv);
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if (prefsLen.isNothing() || prefMapSize.isNothing() ||
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prefsHandle.isNothing() || prefMapHandle.isNothing()) {
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return false;
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}
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SharedPreferenceDeserializer deserializer;
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return deserializer.DeserializeFromSharedMemory(std::move(*prefsHandle),
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std::move(*prefMapHandle),
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*prefsLen, *prefMapSize);
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}
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#ifdef ENABLE_TESTS
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// Allow tests to cause a synthetic delay/"hang" during child process
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// shutdown by setting environment variables.
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# ifdef XP_UNIX
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static void ReallySleep(int aSeconds) {
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struct ::timespec snooze = {aSeconds, 0};
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HANDLE_EINTR(nanosleep(&snooze, &snooze));
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}
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# else
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static void ReallySleep(int aSeconds) { ::Sleep(aSeconds * 1000); }
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# endif // Unix/Win
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static void SleepIfEnv(const char* aName) {
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if (auto* value = PR_GetEnv(aName)) {
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ReallySleep(atoi(value));
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}
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}
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#else // not tests
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static void SleepIfEnv(const char* aName) {}
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#endif
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ProcessChild::~ProcessChild() {
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#ifdef NS_FREE_PERMANENT_DATA
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// In this case, we won't early-exit and we'll wait indefinitely for
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// child processes to terminate. This sleep is late enough that, in
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// content processes, it won't block parent process shutdown, so
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// we'll get into late IPC shutdown with processes still running.
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SleepIfEnv("MOZ_TEST_CHILD_EXIT_HANG");
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#endif
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gIPCShutdownStateAnnotation = ""_ns;
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gProcessChild = nullptr;
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}
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/* static */
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void ProcessChild::NotifiedImpendingShutdown() {
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sExpectingShutdown = true;
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ProcessChild::AppendToIPCShutdownStateAnnotation(
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"NotifiedImpendingShutdown"_ns);
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}
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/* static */
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bool ProcessChild::ExpectingShutdown() { return sExpectingShutdown; }
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/* static */
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void ProcessChild::QuickExit() {
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#ifndef NS_FREE_PERMANENT_DATA
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// In this case, we're going to terminate the child process before
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// we get to ~ProcessChild above (and terminate the parent process
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// before the shutdown hook in ProcessWatcher). Instead, blocking
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// earlier will let us exercise ProcessWatcher's kill timer.
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SleepIfEnv("MOZ_TEST_CHILD_EXIT_HANG");
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#endif
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AppShutdown::DoImmediateExit();
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}
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UntypedEndpoint ProcessChild::TakeInitialEndpoint() {
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return UntypedEndpoint{PrivateIPDLInterface{},
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child_thread()->TakeInitialPort(), mMessageChannelId,
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EndpointProcInfo::Current(),
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EndpointProcInfo{.mPid = mParentPid, .mChildID = 0}};
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}
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} // namespace ipc
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} // namespace mozilla
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