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      1 /*	$NetBSD: poll.h,v 1.17 2024/11/01 16:37:42 nia Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 1998 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Charles M. Hannum.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29  * POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 
     32 #ifndef _SYS_POLL_H_
     33 #define	_SYS_POLL_H_
     34 
     35 #include <sys/featuretest.h>
     36 
     37 typedef unsigned int	nfds_t;
     38 
     39 struct pollfd {
     40 	int	fd;		/* file descriptor */
     41 	short	events;		/* events to look for */
     42 	short	revents;	/* events returned */
     43 };
     44 
     45 /*
     46  * Testable events (may be specified in events field).
     47  */
     48 #define	POLLIN		0x0001
     49 #define	POLLPRI		0x0002
     50 #define	POLLOUT		0x0004
     51 #define	POLLRDNORM	0x0040
     52 #define	POLLWRNORM	POLLOUT
     53 #define	POLLRDBAND	0x0080
     54 #define	POLLWRBAND	0x0100
     55 
     56 /*
     57  * Non-testable events (may not be specified in events field).
     58  */
     59 #define	POLLERR		0x0008
     60 #define	POLLHUP		0x0010
     61 #define	POLLNVAL	0x0020
     62 
     63 #if defined(_NETBSD_SOURCE)
     64 /*
     65  * Infinite timeout value.
     66  */
     67 #define	INFTIM		-1
     68 #endif
     69 
     70 #ifdef _KERNEL
     71 #include <sys/signal.h>		/* for sigset_t */
     72 
     73 struct lwp;
     74 struct timespec;
     75 
     76 int	pollcommon(register_t *, struct pollfd *, u_int,
     77     struct timespec *, sigset_t *);
     78 
     79 #else
     80 #include <sys/cdefs.h>
     81 
     82 __BEGIN_DECLS
     83 int	poll(struct pollfd *, nfds_t, int);
     84 __END_DECLS
     85 
     86 /*
     87  * IEEE Std 1003.1-2024 (POSIX.1-2024)
     88  */
     89 #if (_POSIX_C_SOURCE - 0) >= 202405L || (_XOPEN_SOURCE - 0 >= 800) || \
     90     defined(_NETBSD_SOURCE)
     91 #include <sys/sigtypes.h>	/* for sigset_t */
     92 struct timespec;
     93 
     94 __BEGIN_DECLS
     95 #ifndef __LIBC12_SOURCE__
     96 #ifdef _NETBSD_SOURCE
     97 int	pollts(struct pollfd * __restrict, nfds_t,
     98     const struct timespec * __restrict, const sigset_t * __restrict)
     99     __RENAME(__pollts50);
    100 #endif
    101 int	ppoll(struct pollfd * __restrict, nfds_t,
    102     const struct timespec * __restrict, const sigset_t * __restrict);
    103 #endif /* __LIBC12_SOURCE__ */
    104 __END_DECLS
    105 #endif /* _NETBSD_SOURCE */
    106 
    107 #endif /* _KERNEL */
    108 
    109 #endif /* !_SYS_POLL_H_ */
    110