/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License, Version 1.0 only
 * (the "License").  You may not use this file except in compliance
 * with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */
/*
 * Copyright (c) 1998 by Sun Microsystems, Inc.
 * All rights reserved.
 */

/*
 * Copyright 2015, Joyent, Inc.
 */

#ifndef _SYS_DEVPOLL_H
#define _SYS_DEVPOLL_H

#include <sys/poll_impl.h>
#include <sys/types32.h>

#ifdef  __cplusplus
extern "C" {
#endif


/* /dev/poll ioctl */
#define         DPIOC   (0xD0 << 8)
#define DP_POLL         (DPIOC | 1)     /* poll on fds cached via /dev/poll */
#define DP_ISPOLLED     (DPIOC | 2)     /* is this fd cached in /dev/poll */
#define DP_PPOLL        (DPIOC | 3)     /* ppoll on fds cached via /dev/poll */
#define DP_EPOLLCOMPAT  (DPIOC | 4)     /* turn on epoll compatibility */

#define DEVPOLLSIZE     1000            /* /dev/poll table size increment */

/*
 * /dev/poll DP_POLL ioctl format
 */
typedef struct dvpoll {
        pollfd_t        *dp_fds;        /* pollfd array */
        nfds_t          dp_nfds;        /* num of pollfd's in dp_fds[] */
        int             dp_timeout;     /* time out in milisec */
        sigset_t        *dp_setp;       /* sigset, if any */
} dvpoll_t;

typedef struct dvpoll32 {
        caddr32_t       dp_fds;         /* pollfd array */
        uint32_t        dp_nfds;        /* num of pollfd's in dp_fds[] */
        int32_t         dp_timeout;     /* time out in milisec */
        caddr32_t       dp_setp;        /* sigset, if any */
} dvpoll32_t;

typedef struct dvpoll_epollfd {
        pollfd_t        dpep_pollfd;    /* must be first member */
        uint64_t        dpep_data;      /* data payload */
} dvpoll_epollfd_t;

#ifdef _KERNEL

typedef struct dp_entry {
        kmutex_t        dpe_lock;       /* protect a devpoll entry */
        pollcache_t     *dpe_pcache;    /* a ptr to pollcache */
        int             dpe_refcnt;     /* no. of ioctl lwp on the dpe */
        int             dpe_writerwait; /* no. of waits on write */
        int             dpe_flag;       /* see below */
        kcondvar_t      dpe_cv;
} dp_entry_t;

#define DP_WRITER_PRESENT       0x1     /* a write is in progress */
#define DP_ISEPOLLCOMPAT        0x2     /* epoll compatibility mode */

#define DP_REFRELE(dpep) {                      \
        mutex_enter(&(dpep)->dpe_lock);         \
        ASSERT((dpep)->dpe_refcnt > 0);         \
        (dpep)->dpe_refcnt--;                   \
        mutex_exit(&(dpep)->dpe_lock);          \
}
#endif  /* _KERNEL */

#ifdef  __cplusplus
}
#endif

#endif  /* _SYS_DEVPOLL_H */