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// Copyright 2013 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef COMPONENTS_CRASH_CONTENT_BROWSER_CRASH_HANDLER_HOST_LINUX_H_
#define COMPONENTS_CRASH_CONTENT_BROWSER_CRASH_HANDLER_HOST_LINUX_H_
#include <sys/types.h>
#include <string>
#include <utility>
#include "base/compiler_specific.h"
#include "base/files/file_path.h"
#include "base/macros.h"
#include "base/message_loop/message_loop.h"
#include "base/sequence_checker.h"
#include "base/threading/sequenced_worker_pool.h"
#include "components/crash/content/app/breakpad_linux_impl.h"
namespace base {
class Thread;
}
namespace breakpad {
struct BreakpadInfo;
// This is the host for processes which run breakpad inside the sandbox on
// Linux or Android. We perform the crash dump from the browser because it
// allows us to be outside the sandbox.
//
// Processes signal that they need to be dumped by sending a datagram over a
// UNIX domain socket. All processes of the same type share the client end of
// this socket which is installed in their descriptor table before exec.
class CrashHandlerHostLinux : public base::MessageLoopForIO::Watcher,
public base::MessageLoop::DestructionObserver {
public:
CrashHandlerHostLinux(const std::string& process_type,
const base::FilePath& dumps_path,
bool upload);
~CrashHandlerHostLinux() override;
// Starts the uploader thread. Must be called immediately after creating the
// class.
void StartUploaderThread();
// Get the file descriptor which processes should be given in order to signal
// crashes to the browser.
int GetDeathSignalSocket() const {
return process_socket_;
}
// MessagePumbLibevent::Watcher impl:
void OnFileCanWriteWithoutBlocking(int fd) override;
void OnFileCanReadWithoutBlocking(int fd) override;
// MessageLoop::DestructionObserver impl:
void WillDestroyCurrentMessageLoop() override;
// Whether we are shutting down or not.
bool IsShuttingDown() const;
private:
void Init();
// Do work in a sequenced worker pool for OnFileCanReadWithoutBlocking().
void WriteDumpFile(std::unique_ptr<BreakpadInfo> info,
std::unique_ptr<char[]> crash_context,
pid_t crashing_pid,
int signal_fd);
// Continue OnFileCanReadWithoutBlocking()'s work on the IO thread.
void QueueCrashDumpTask(std::unique_ptr<BreakpadInfo> info, int signal_fd);
// Find crashing thread (may delay and retry) and dump on IPC thread.
void FindCrashingThreadAndDump(pid_t crashing_pid,
const std::string& expected_syscall_data,
std::unique_ptr<char[]> crash_context,
std::unique_ptr<CrashKeyStorage> crash_keys,
#if defined(ADDRESS_SANITIZER)
std::unique_ptr<char[]> asan_report,
#endif
uint64_t uptime,
size_t oom_size,
int signal_fd,
int attempt);
std::string process_type_;
base::FilePath dumps_path_;
#if !defined(OS_ANDROID)
bool upload_;
#endif
int process_socket_;
int browser_socket_;
base::MessageLoopForIO::FileDescriptorWatcher file_descriptor_watcher_;
std::unique_ptr<base::Thread> uploader_thread_;
bool shutting_down_;
// Unique sequence token so that writing crash dump won't be blocked
// by other tasks.
base::SequencedWorkerPool::SequenceToken worker_pool_token_;
// Used to verify that calls to WriteDumpFile() are sequenced.
base::SequenceChecker write_dump_file_sequence_checker_;
DISALLOW_COPY_AND_ASSIGN(CrashHandlerHostLinux);
};
} // namespace breakpad
#endif // COMPONENTS_CRASH_CONTENT_BROWSER_CRASH_HANDLER_HOST_LINUX_H_
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