/*
 * This file and its contents are supplied under the terms of the
 * Common Development and Distribution License ("CDDL"), version 1.0.
 * You may only use this file in accordance with the terms of version
 * 1.0 of the CDDL.
 *
 * A full copy of the text of the CDDL should have accompanied this
 * source.  A copy of the CDDL is also available via the Internet at
 * http://www.illumos.org/license/CDDL.
 */

/*
 * Copyright (c) 2014, Joyent, Inc.  All rights reserved.
 * Copyright 2020 Oxide Computer Company
 */

#ifndef _SYS_EPOLL_H
#define _SYS_EPOLL_H

#include <sys/types.h>
#include <sys/poll.h>

#ifdef  __cplusplus
extern "C" {
#endif

typedef union epoll_data {
        void            *ptr;
        int             fd;
        uint32_t        u32;
        uint64_t        u64;
} epoll_data_t;

#if _LONG_LONG_ALIGNMENT == 8 && _LONG_LONG_ALIGNMENT_32 == 4
#pragma pack(4)
#endif

typedef struct epoll_event {
        uint32_t        events;         /* events */
        epoll_data_t    data;           /* user-specified data */
} epoll_event_t;

#if _LONG_LONG_ALIGNMENT == 8 && _LONG_LONG_ALIGNMENT_32 == 4
#pragma pack()
#endif

/*
 * Define the EPOLL* constants in terms of their poll(2)/poll(4D) equivalents.
 * Note that the values match the equivalents in Linux to allow for any binary
 * compatibility layers to not need to translate them.
 */
#define EPOLLIN         0x0001
#define EPOLLPRI        0x0002
#define EPOLLOUT        0x0004
#define EPOLLRDNORM     0x0040
#define EPOLLRDBAND     0x0080
#define EPOLLWRNORM     0x0100
#define EPOLLWRBAND     0x0200
#define EPOLLMSG        0x0400          /* not used */
#define EPOLLERR        0x0008
#define EPOLLHUP        0x0010
#define EPOLLRDHUP      0x2000

#define EPOLLEXCLUSIVE  (1UL << 28)     /* sets exclusive wake-up mode */
#define EPOLLWAKEUP     (1UL << 29)     /* no meaning; silently ignored */
#define EPOLLONESHOT    (1UL << 30)     /* translated to POLLONESHOT */
#define EPOLLET         (1UL << 31)     /* translated to POLLET */

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

#define EPOLL_CLOEXEC   02000000

#if !defined(_KERNEL)

extern int epoll_create(int size);
extern int epoll_create1(int flags);
extern int epoll_ctl(int epfd, int op, int fd, struct epoll_event *event);
extern int epoll_wait(int epfd, struct epoll_event *events,
    int maxevents, int timeout);
extern int epoll_pwait(int epfd, struct epoll_event *events,
    int maxevents, int timeout, const sigset_t *sigmask);

#endif /* !_KERNEL */

#ifdef  __cplusplus
}
#endif

#endif  /* _SYS_EPOLL_H */