electron/atom/app/atom_main.cc

// Copyright (c) 2013 GitHub, Inc.
// Use of this source code is governed by the MIT license that can be
// found in the LICENSE file.

#include "atom/app/atom_main.h"

#include <cstdlib>
#include <vector>

#if defined(OS_WIN)
#include <windows.h>  // windows.h must be included first

#include <atlbase.h>  // ensures that ATL statics like `_AtlWinModule` are initialized (it's an issue in static debug build)
#include <shellapi.h>
#include <shellscalingapi.h>
#include <tchar.h>

#include "atom/app/atom_main_delegate.h"
#include "atom/app/command_line_args.h"
#include "atom/common/crash_reporter/win/crash_service_main.h"
#include "base/environment.h"
#include "base/process/launch.h"
#include "base/strings/utf_string_conversions.h"
#include "base/win/windows_version.h"
#include "content/public/app/sandbox_helper_win.h"
#include "sandbox/win/src/sandbox_types.h"
#elif defined(OS_LINUX)  // defined(OS_WIN)
#include <unistd.h>
#include <cstdio>
#include "atom/app/atom_main_delegate.h"  // NOLINT
#include "content/public/app/content_main.h"
#else  // defined(OS_LINUX)
#include <unistd.h>
#include <cstdio>
#include "atom/app/atom_library_main.h"
#endif  // defined(OS_MACOSX)

#include "atom/app/node_main.h"
#include "atom/common/atom_command_line.h"
#include "base/at_exit.h"
#include "base/i18n/icu_util.h"

namespace {

#ifdef ENABLE_RUN_AS_NODE
const char kRunAsNode[] = "ELECTRON_RUN_AS_NODE";
#endif

#if defined(ENABLE_RUN_AS_NODE) || defined(OS_WIN)
bool IsEnvSet(const char* name) {
#if defined(OS_WIN)
  size_t required_size;
  getenv_s(&required_size, nullptr, 0, name);
  return required_size != 0;
#else
  char* indicator = getenv(name);
  return indicator && indicator[0] != '\0';
#endif
}
#endif

#if defined(OS_POSIX)
void FixStdioStreams() {
  // libuv may mark stdin/stdout/stderr as close-on-exec, which interferes
  // with chromium's subprocess spawning. As a workaround, we detect if these
  // streams are closed on startup, and reopen them as /dev/null if necessary.
  // Otherwise, an unrelated file descriptor will be assigned as stdout/stderr
  // which may cause various errors when attempting to write to them.
  //
  // For details see https://github.com/libuv/libuv/issues/2062
  struct stat st;
  if (fstat(STDIN_FILENO, &st) < 0 && errno == EBADF)
    freopen("/dev/null", "r", stdin);
  if (fstat(STDOUT_FILENO, &st) < 0 && errno == EBADF)
    freopen("/dev/null", "w", stdout);
  if (fstat(STDERR_FILENO, &st) < 0 && errno == EBADF)
    freopen("/dev/null", "w", stderr);
}
#endif

}  // namespace

#if defined(OS_WIN)
int APIENTRY wWinMain(HINSTANCE instance, HINSTANCE, wchar_t* cmd, int) {
  struct Arguments {
    int argc = 0;
    wchar_t** argv = ::CommandLineToArgvW(::GetCommandLineW(), &argc);

    ~Arguments() { LocalFree(argv); }
  } arguments;

  if (!arguments.argv)
    return -1;

#ifdef _DEBUG
  // Don't display assert dialog boxes in CI test runs
  static const auto kCI = "ELECTRON_CI";
  bool is_ci = IsEnvSet(kCI);
  if (!is_ci) {
    for (int i = 0; i < arguments.argc; ++i) {
      if (!_wcsicmp(arguments.argv[i], L"--ci")) {
        is_ci = true;
        _putenv_s(kCI, "1");  // set flag for child processes
        break;
      }
    }
  }
  if (is_ci) {
    _CrtSetReportMode(_CRT_ERROR, _CRTDBG_MODE_DEBUG | _CRTDBG_MODE_FILE);
    _CrtSetReportFile(_CRT_ERROR, _CRTDBG_FILE_STDERR);

    _CrtSetReportMode(_CRT_ASSERT, _CRTDBG_MODE_DEBUG | _CRTDBG_MODE_FILE);
    _CrtSetReportFile(_CRT_ASSERT, _CRTDBG_FILE_STDERR);

    _set_error_mode(_OUT_TO_STDERR);
  }
#endif

#ifdef ENABLE_RUN_AS_NODE
  bool run_as_node = IsEnvSet(kRunAsNode);
#else
  bool run_as_node = false;
#endif

  // Make sure the output is printed to console.
  if (run_as_node || !IsEnvSet("ELECTRON_NO_ATTACH_CONSOLE"))
    base::RouteStdioToConsole(false);

#ifndef DEBUG
  // Chromium has its own TLS subsystem which supports automatic destruction
  // of thread-local data, and also depends on memory allocation routines
  // provided by the CRT. The problem is that the auto-destruction mechanism
  // uses a hidden feature of the OS loader which calls a callback on thread
  // exit, but only after all loaded DLLs have been detached. Since the CRT is
  // also a DLL, it happens that by the time Chromium's `OnThreadExit` function
  // is called, the heap functions, though still in memory, no longer perform
  // their duties, and when Chromium calls `free` on its buffer, it triggers
  // an access violation error.
  // We work around this problem by invoking Chromium's `OnThreadExit` in time
  // from within the CRT's atexit facility, ensuring the heap functions are
  // still active. The second invocation from the OS loader will be a no-op.
  extern void NTAPI OnThreadExit(PVOID module, DWORD reason, PVOID reserved);
  atexit([]() { OnThreadExit(nullptr, DLL_THREAD_DETACH, nullptr); });
#endif

#ifdef ENABLE_RUN_AS_NODE
  if (run_as_node) {
    std::vector<char*> argv(arguments.argc);
    std::transform(
        arguments.argv, arguments.argv + arguments.argc, argv.begin(),
        [](auto& a) { return _strdup(base::WideToUTF8(a).c_str()); });

    base::AtExitManager atexit_manager;
    base::i18n::InitializeICU();
    auto ret = atom::NodeMain(argv.size(), argv.data());
    std::for_each(argv.begin(), argv.end(), free);
    return ret;
  }
#endif

  if (IsEnvSet("ELECTRON_INTERNAL_CRASH_SERVICE")) {
    return crash_service::Main(cmd);
  }

  if (!atom::CheckCommandLineArguments(arguments.argc, arguments.argv))
    return -1;

  sandbox::SandboxInterfaceInfo sandbox_info = {0};
  content::InitializeSandboxInfo(&sandbox_info);
  atom::AtomMainDelegate delegate;

  content::ContentMainParams params(&delegate);
  params.instance = instance;
  params.sandbox_info = &sandbox_info;
  atom::AtomCommandLine::Init(arguments.argc, arguments.argv);
  return content::ContentMain(params);
}

#elif defined(OS_LINUX)  // defined(OS_WIN)

int main(int argc, char* argv[]) {
#ifdef ENABLE_RUN_AS_NODE
  FixStdioStreams();

  if (IsEnvSet(kRunAsNode)) {
    base::i18n::InitializeICU();
    base::AtExitManager atexit_manager;
    return atom::NodeMain(argc, argv);
  }
#endif

  atom::AtomMainDelegate delegate;
  content::ContentMainParams params(&delegate);
  params.argc = argc;
  params.argv = const_cast<const char**>(argv);
  atom::AtomCommandLine::Init(argc, argv);
  return content::ContentMain(params);
}

#else  // defined(OS_LINUX)

int main(int argc, char* argv[]) {
#ifdef ENABLE_RUN_AS_NODE
  FixStdioStreams();

  if (IsEnvSet(kRunAsNode)) {
    return AtomInitializeICUandStartNode(argc, argv);
  }
#endif

  return AtomMain(argc, argv);
}

#endif  // defined(OS_MACOSX)