/*      $NetBSD: epoll.h,v 1.3 2024/10/30 15:56:12 riastradh Exp $      */

/*-
 * Copyright (c) 2007 Roman Divacky
 * Copyright (c) 2014 Dmitry Chagin <dchagin@FreeBSD.org>
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. 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 AUTHOR 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 AUTHOR 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.
 *
 * $FreeBSD$
 */

#ifndef _SYS_EPOLL_H_
#define _SYS_EPOLL_H_

#include <sys/fcntl.h>                  /* for O_CLOEXEC */
#include <sys/featuretest.h>
#include <sys/sigtypes.h>               /* for sigset_t */
#include <sys/types.h>                  /* for uint32_t, uint64_t */

struct timespec;

#define EPOLL_CLOEXEC   O_CLOEXEC

#define EPOLLIN         0x00000001
#define EPOLLPRI        0x00000002
#define EPOLLOUT        0x00000004
#define EPOLLERR        0x00000008
#define EPOLLHUP        0x00000010
#define EPOLLRDNORM     0x00000040
#define EPOLLRDBAND     0x00000080
#define EPOLLWRNORM     0x00000100
#define EPOLLWRBAND     0x00000200
#define EPOLLMSG        0x00000400
#define EPOLLRDHUP      0x00002000
#define EPOLLWAKEUP     0x20000000
#define EPOLLONESHOT    0x40000000
#define EPOLLET         0x80000000

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

#ifdef _KERNEL
#define EPOLL_MAX_EVENTS        (4 * 1024 * 1024)
typedef uint64_t                epoll_data_t;
#else
union epoll_data {
        void            *ptr;
        int             fd;
        uint32_t        u32;
        uint64_t        u64;
};

typedef union epoll_data        epoll_data_t;
#endif

struct epoll_event {
        uint32_t        events;
        epoll_data_t    data;
};

#ifdef _KERNEL
int     epoll_ctl_common(struct lwp *l, register_t *retval, int epfd, int op,
            int fd, struct epoll_event *event);
int     epoll_wait_common(struct lwp *l, register_t *retval, int epfd,
            struct epoll_event *events, int maxevents, struct timespec *tsp,
            const sigset_t *nss);
#else   /* !_KERNEL */
__BEGIN_DECLS
#ifdef _NETBSD_SOURCE
int     epoll_create(int size);
int     epoll_create1(int flags);
int     epoll_ctl(int epfd, int op, int fd, struct epoll_event *event);
int     epoll_wait(int epfd, struct epoll_event *events, int maxevents,
            int timeout);
int     epoll_pwait(int epfd, struct epoll_event *events, int maxevents,
            int timeout, const sigset_t *sigmask);
int     epoll_pwait2(int epfd, struct epoll_event *events, int maxevents,
            const struct timespec *timeout, const sigset_t *sigmask);
#endif  /* _NETBSD_SOURCE */
__END_DECLS
#endif  /* !_KERNEL */

#endif  /* !_SYS_EPOLL_H_ */