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// Copyright (c) 2011 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 CONTENT_COMMON_ZYGOTE_FORK_DELEGATE_LINUX_H_
#define CONTENT_COMMON_ZYGOTE_FORK_DELEGATE_LINUX_H_
#pragma once
#include <unistd.h>
#include <string>
#include <vector>
#include "base/basictypes.h"
// The ZygoteForkDelegate allows the Chrome Linux zygote to delegate
// fork operations to another class that knows how to do some
// specialized version of fork.
class ZygoteForkDelegate {
public:
// A ZygoteForkDelegate is created during Chrome linux zygote
// initialization, and provides "fork()" functionality with
// as an alternative to forking the zygote. A new delegate is
// passed in as an argument to ZygoteMain().
ZygoteForkDelegate() {}
virtual ~ZygoteForkDelegate() {}
// Initialization happens in the zygote after it has been
// started by ZygoteMain.
virtual void Init(bool sandboxed,
int browserdesc,
int sandboxdesc) = 0;
// Returns 'true' if the delegate would like to handle a given
// fork request. Otherwise returns false.
virtual bool CanHelp(const std::string& process_type) = 0;
// Delegate forks, returning a -1 on failure. Outside the
// suid sandbox, Fork() returns the Linux process ID. Inside
// the sandbox, returns a positive integer, with PID discovery
// handled by the sandbox.
virtual pid_t Fork(const std::vector<int>& fds) = 0;
// After a successful for, signal the child to indicate that
// the child's PID has been received. Also communicate the
// channel switch as a part of acknowledgement message.
virtual bool AckChild(int fd, const std::string& channel_switch) = 0;
};
#endif // CONTENT_COMMON_ZYGOTE_FORK_DELEGATE_LINUX_H_
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