/*      $NetBSD: poll.h,v 1.17 2024/11/01 16:37:42 nia Exp $    */

/*-
 * Copyright (c) 1998 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Charles M. Hannum.
 *
 * 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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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 _SYS_POLL_H_
#define _SYS_POLL_H_

#include <sys/featuretest.h>

typedef unsigned int    nfds_t;

struct pollfd {
        int     fd;             /* file descriptor */
        short   events;         /* events to look for */
        short   revents;        /* events returned */
};

/*
 * Testable events (may be specified in events field).
 */
#define POLLIN          0x0001
#define POLLPRI         0x0002
#define POLLOUT         0x0004
#define POLLRDNORM      0x0040
#define POLLWRNORM      POLLOUT
#define POLLRDBAND      0x0080
#define POLLWRBAND      0x0100

/*
 * Non-testable events (may not be specified in events field).
 */
#define POLLERR         0x0008
#define POLLHUP         0x0010
#define POLLNVAL        0x0020

#if defined(_NETBSD_SOURCE)
/*
 * Infinite timeout value.
 */
#define INFTIM          -1
#endif

#ifdef _KERNEL
#include <sys/signal.h>         /* for sigset_t */

struct lwp;
struct timespec;

int     pollcommon(register_t *, struct pollfd *, u_int,
    struct timespec *, sigset_t *);

#else
#include <sys/cdefs.h>

__BEGIN_DECLS
int     poll(struct pollfd *, nfds_t, int);
__END_DECLS

/*    
 * IEEE Std 1003.1-2024 (POSIX.1-2024)
 */
#if (_POSIX_C_SOURCE - 0) >= 202405L || (_XOPEN_SOURCE - 0 >= 800) || \
    defined(_NETBSD_SOURCE)
#include <sys/sigtypes.h>       /* for sigset_t */
struct timespec;

__BEGIN_DECLS
#ifndef __LIBC12_SOURCE__
#ifdef _NETBSD_SOURCE
int     pollts(struct pollfd * __restrict, nfds_t,
    const struct timespec * __restrict, const sigset_t * __restrict)
    __RENAME(__pollts50);
#endif
int     ppoll(struct pollfd * __restrict, nfds_t,
    const struct timespec * __restrict, const sigset_t * __restrict);
#endif /* __LIBC12_SOURCE__ */
__END_DECLS
#endif /* _NETBSD_SOURCE */

#endif /* _KERNEL */

#endif /* !_SYS_POLL_H_ */