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      1 /*	$NetBSD: eventfd.h,v 1.3 2021/09/21 13:51:46 ryoon Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2020 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Jason R. Thorpe.
      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_EVENTFD_H_
     33 #define	_SYS_EVENTFD_H_
     34 
     35 #include <sys/fcntl.h>
     36 
     37 /*
     38  * Definitions for eventfd(2).  This implementation is API compatible
     39  * with the Linux eventfd(2) interface.
     40  */
     41 
     42 typedef uint64_t eventfd_t;
     43 
     44 #define	EFD_SEMAPHORE	O_RDWR
     45 #define	EFD_CLOEXEC	O_CLOEXEC
     46 #define	EFD_NONBLOCK	O_NONBLOCK
     47 
     48 #ifdef _KERNEL
     49 struct lwp;
     50 int	do_eventfd(struct lwp *, unsigned int, int, register_t *);
     51 #else /* ! _KERNEL */
     52 __BEGIN_DECLS
     53 int	eventfd(unsigned int, int);
     54 int	eventfd_read(int, eventfd_t *);
     55 int	eventfd_write(int, eventfd_t);
     56 __END_DECLS
     57 #endif /* _KERNEL */
     58 
     59 #endif /* _SYS_EVENTFD_H_ */
     60