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// Copyright (c) 2012 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.
#include <set>
#include <string>
#include <vector>
#include "base/pickle.h"
#include "base/process/kill.h"
#include "base/synchronization/lock.h"
#include "content/public/browser/file_descriptor_info.h"
#include "content/public/browser/zygote_host_linux.h"
template<typename Type>
struct DefaultSingletonTraits;
namespace content {
class CONTENT_EXPORT ZygoteHostImpl : public ZygoteHost {
// Returns the singleton instance.
static ZygoteHostImpl* GetInstance();
void Init(const std::string& sandbox_cmd);
// After the last known Zygote child exits, notify the Zygote to exit.
void TearDownAfterLastChild();
// Tries to start a process of type indicated by process_type.
// Returns its pid on success, otherwise
// base::kNullProcessHandle;
pid_t ForkRequest(const std::vector<std::string>& command_line,
const std::vector<FileDescriptorInfo>& mapping,
const std::string& process_type);
void EnsureProcessTerminated(pid_t process);
// Get the termination status (and, optionally, the exit code) of
// the process. |exit_code| is set to the exit code of the child
// process. (|exit_code| may be NULL.)
// Unfortunately the Zygote can not accurately figure out if a process
// is already dead without waiting synchronously for it.
// |known_dead| should be set to true when we already know that the process
// is dead. When |known_dead| is false, processes could be seen as
// still running, even when they're not. When |known_dead| is true, the
// process will be SIGKILL-ed first (which should have no effect if it was
// really dead). This is to prevent a waiting waitpid() from blocking in
// a single-threaded Zygote. See
base::TerminationStatus GetTerminationStatus(base::ProcessHandle handle,
bool known_dead,
int* exit_code);
// ZygoteHost implementation:
virtual pid_t GetPid() const OVERRIDE;
virtual int GetSandboxStatus() const OVERRIDE;
virtual void AdjustRendererOOMScore(base::ProcessHandle process_handle,
int score) OVERRIDE;
friend struct DefaultSingletonTraits<ZygoteHostImpl>;
virtual ~ZygoteHostImpl();
// Notify the Zygote to exit immediately. This object should not be
// used afterwards.
void TearDown();
// Should be called every time a Zygote child is born.
void ZygoteChildBorn(pid_t process);
// Should be called every time a Zygote child died.
void ZygoteChildDied(pid_t process);
// Sends |data| to the zygote via |control_fd_|. If |fds| is non-NULL, the
// included file descriptors will also be passed. The caller is responsible
// for acquiring |control_lock_|.
bool SendMessage(const Pickle& data, const std::vector<int>* fds);
ssize_t ReadReply(void* buf, size_t buflen);
int control_fd_; // the socket to the zygote
// A lock protecting all communication with the zygote. This lock must be
// acquired before sending a command and released after the result has been
// received.
base::Lock control_lock_;
pid_t pid_;
bool init_;
bool using_suid_sandbox_;
std::string sandbox_binary_;
bool have_read_sandbox_status_word_;
int sandbox_status_;
// A lock protecting list_of_running_zygote_children_ and
// should_teardown_after_last_child_exits_.
base::Lock child_tracking_lock_;
std::set<pid_t> list_of_running_zygote_children_;
bool should_teardown_after_last_child_exits_;
} // namespace content