/*
 * Copyright (c) 2020, 2021, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */

/*
 * This file is available under and governed by the GNU General Public
 * License version 2 only, as published by the Free Software Foundation.
 * However, the following notice accompanied the original version of this
 * file and, per its terms, should not be removed:
 *
 * wepoll - epoll for Windows
 * https://github.com/piscisaureus/wepoll
 *
 * Copyright 2012-2020, Bert Belder <bertbelder@gmail.com>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 *
 *   * Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 *
 *   * Redistributions in binary form must reproduce the above copyright
 *     notice, this list of conditions and the following disclaimer in the
 *     documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#ifndef WEPOLL_H_
#define WEPOLL_H_

#ifndef WEPOLL_EXPORT
#define WEPOLL_EXPORT
#endif

#include <stdint.h>

enum EPOLL_EVENTS {
  EPOLLIN      = (int) (1U <<  0),
  EPOLLPRI     = (int) (1U <<  1),
  EPOLLOUT     = (int) (1U <<  2),
  EPOLLERR     = (int) (1U <<  3),
  EPOLLHUP     = (int) (1U <<  4),
  EPOLLRDNORM  = (int) (1U <<  6),
  EPOLLRDBAND  = (int) (1U <<  7),
  EPOLLWRNORM  = (int) (1U <<  8),
  EPOLLWRBAND  = (int) (1U <<  9),
  EPOLLMSG     = (int) (1U << 10), /* Never reported. */
  EPOLLRDHUP   = (int) (1U << 13),
  EPOLLONESHOT = (int) (1U << 31)
};

#define EPOLLIN      (1U <<  0)
#define EPOLLPRI     (1U <<  1)
#define EPOLLOUT     (1U <<  2)
#define EPOLLERR     (1U <<  3)
#define EPOLLHUP     (1U <<  4)
#define EPOLLRDNORM  (1U <<  6)
#define EPOLLRDBAND  (1U <<  7)
#define EPOLLWRNORM  (1U <<  8)
#define EPOLLWRBAND  (1U <<  9)
#define EPOLLMSG     (1U << 10)
#define EPOLLRDHUP   (1U << 13)
#define EPOLLONESHOT (1U << 31)

#define EPOLL_CTL_ADD 1
#define EPOLL_CTL_MOD 2
#define EPOLL_CTL_DEL 3

typedef void* HANDLE;
typedef uintptr_t SOCKET;

typedef union epoll_data {
  void* ptr;
  int fd;
  uint32_t u32;
  uint64_t u64;
  SOCKET sock; /* Windows specific */
  HANDLE hnd;  /* Windows specific */
} epoll_data_t;

struct epoll_event {
  uint32_t events;   /* Epoll events and flags */
  epoll_data_t data; /* User data variable */
};

#ifdef __cplusplus
extern "C" {
#endif

WEPOLL_EXPORT HANDLE epoll_create(int size);
WEPOLL_EXPORT HANDLE epoll_create1(int flags);

WEPOLL_EXPORT int epoll_close(HANDLE ephnd);

WEPOLL_EXPORT int epoll_ctl(HANDLE ephnd,
                            int op,
                            SOCKET sock,
                            struct epoll_event* event);

WEPOLL_EXPORT int epoll_wait(HANDLE ephnd,
                             struct epoll_event* events,
                             int maxevents,
                             int timeout);

#ifdef __cplusplus
} /* extern "C" */
#endif

#endif /* WEPOLL_H_ */
