Merge "Add new EpollController class."

        "FuseAppLoop.cc",

        "FuseBuffer.cc",

        "FuseBridgeLoop.cc",

        "EpollController.cc",

    ]

}

/*

 * Copyright (C) 2017 The Android Open Source Project

 *

 * Licensed under the Apache License, Version 2.0 (the "License");

 * you may not use this file except in compliance with the License.

 * You may obtain a copy of the License at

 *

 *      http://www.apache.org/licenses/LICENSE-2.0

 *

 * Unless required by applicable law or agreed to in writing, software

 * distributed under the License is distributed on an "AS IS" BASIS,

 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

 * See the License for the specic language governing permissions and

 * limitations under the License.

 */

#include <android-base/logging.h>

#include "libappfuse/EpollController.h"

namespace android {

namespace fuse {

EpollController::EpollController(base::unique_fd&& poll_fd) : poll_fd_(std::move(poll_fd)) {

}

bool EpollController::Wait(size_t event_count) {

    events_.resize(event_count);

    const int result = TEMP_FAILURE_RETRY(epoll_wait(poll_fd_, events_.data(), event_count, -1));

    if (result == -1) {

        PLOG(ERROR) << "Failed to wait for epoll";

        return false;

    }

    events_.resize(result);

    return true;

}

bool EpollController::AddFd(int fd, int events, void* data) {

    return InvokeControl(EPOLL_CTL_ADD, fd, events, data);

}

bool EpollController::UpdateFd(int fd, int events, void* data) {

    return InvokeControl(EPOLL_CTL_MOD, fd, events, data);

}

bool EpollController::RemoveFd(int fd) {

    return InvokeControl(EPOLL_CTL_DEL, fd, /* events */ 0, nullptr);

}

const std::vector<epoll_event>& EpollController::events() const {

    return events_;

}

bool EpollController::InvokeControl(int op, int fd, int events, void* data) const {

    epoll_event event;

    memset(&event, 0, sizeof(event));

    event.events = events;

    event.data.ptr = data;

    if (epoll_ctl(poll_fd_, op, fd, &event) == -1) {

        PLOG(ERROR) << "epoll_ctl() error op=" << op;

        return false;

    }

    return true;

}

}

}

/*

 * Copyright (C) 2017 The Android Open Source Project

 *

 * Licensed under the Apache License, Version 2.0 (the "License");

 * you may not use this file except in compliance with the License.

 * You may obtain a copy of the License at

 *

 *      http://www.apache.org/licenses/LICENSE-2.0

 *

 * Unless required by applicable law or agreed to in writing, software

 * distributed under the License is distributed on an "AS IS" BASIS,

 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

 * See the License for the specic language governing permissions and

 * limitations under the License.

 */

#ifndef ANDROID_LIBAPPFUSE_EPOLLCONTROLLER_H_

#define ANDROID_LIBAPPFUSE_EPOLLCONTROLLER_H_

#include <sys/epoll.h>

#include <vector>

#include <android-base/macros.h>

#include <android-base/unique_fd.h>

namespace android {

namespace fuse {

class EpollController {

  public:

    explicit EpollController(base::unique_fd&& poll_fd);

    bool Wait(size_t event_count);

    bool AddFd(int fd, int events, void* data);

    bool UpdateFd(int fd, int events, void* data);

    bool RemoveFd(int fd);

    const std::vector<epoll_event>& events() const;

  private:

    bool InvokeControl(int op, int fd, int events, void* data) const;

    base::unique_fd poll_fd_;

    std::vector<epoll_event> events_;

    DISALLOW_COPY_AND_ASSIGN(EpollController);

};

}

}

#endif  // ANDROID_LIBAPPFUSE_EPOLLCONTROLLER_H_