/*
 * 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_
#pragma once

#ifndef WEPOLL_EXPORT
#define WEPOLL_EXPORT
#endif

#include <stdint.h>
#include <time.h>

enum EPOLL_EVENTS {
	EPOLLIN = 0x0001,
#define EPOLLIN          EPOLLIN
	EPOLLPRI = 0x0002,
#define EPOLLPRI         EPOLLPRI
	EPOLLOUT = 0x0004,
#define EPOLLOUT         EPOLLOUT
	EPOLLERR = 0x0008,
#define EPOLLERR         EPOLLERR
	EPOLLHUP = 0x0010,
#define EPOLLHUP         EPOLLHUP
	EPOLLNVAL = 0x0020,
#define EPOLLNVAL        EPOLLNVAL
	EPOLLRDNORM = 0x0040,
#define EPOLLRDNORM      EPOLLRDNORM
	EPOLLRDBAND = 0x0080,
#define EPOLLRDBAND      EPOLLRDBAND
	EPOLLWRNORM = 0x0100,
#define EPOLLWRNORM      EPOLLWRNORM
	EPOLLWRBAND = 0x0200,
#define EPOLLWRBAND      EPOLLWRBAND
	EPOLLMSG = 0x0400, /* Never reported. */
#define EPOLLMSG         EPOLLMSG
	EPOLLRDHUP = 0x2000,
#define EPOLLRDHUP       EPOLLRDHUP
	EPOLL_URING_WAKE = (unsigned)(1U << 27),
#define EPOLL_URING_WAKE EPOLL_URING_WAKE
	EPOLLEXCLUSIVE = (unsigned)(1U << 28),
#define EPOLLEXCLUSIVE   EPOLLEXCLUSIVE
	EPOLLWAKEUP = (unsigned)(1U << 29),
#define EPOLLWAKEUP      EPOLLWAKEUP
	EPOLLONESHOT = (unsigned)(1U << 30),
#define EPOLLONESHOT     EPOLLONESHOT
	EPOLLET = (unsigned)(1U << 31)
#define EPOLLET          EPOLLET
};

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

enum {
	EPOLL_CLOEXEC = 02000000 /*O_CLOEXEC*/
#define EPOLL_CLOEXEC EPOLL_CLOEXEC
};

typedef void* HANDLE;
typedef uintptr_t SOCKET;

#define _SIGSET_NWORDS (1024 / (8 * sizeof (size_t)))
typedef struct
{
	size_t __val[_SIGSET_NWORDS];
} sigset_t;

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;

#pragma pack(push, 1)
struct epoll_event {
	uint32_t events;   /* Epoll events and flags */
	epoll_data_t data; /* User data variable */
};
#pragma pack(pop)

#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);
	WEPOLL_EXPORT int epoll_pwait(HANDLE ephnd,
		struct epoll_event* events,
		int maxevents,
		int timeout,
		const sigset_t* sigmask);
	WEPOLL_EXPORT int epoll_pwait2(HANDLE ephnd,
		struct epoll_event* events,
		int maxevents,
		const struct timespec* timeout,
		const sigset_t* sigmask);

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

#endif /* WEPOLL_H_ */