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/*
* 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) 2017, Joyent, Inc.
*/
/*
* Header file to support for the eventfd facility. Note that this facility
* is designed to be binary compatible with the Linux eventfd facility; values
* for constants here should therefore exactly match those found in Linux, and
* this facility shouldn't be extended independently of Linux.
*/
#ifndef _SYS_EVENTFD_H
#define _SYS_EVENTFD_H
#include <sys/types.h>
#ifdef __cplusplus
extern "C" {
#endif
typedef uint64_t eventfd_t;
/*
* To assure binary compatibility with Linux, these values are fixed at their
* Linux equivalents, not their native ones.
*/
#define EFD_CLOEXEC 02000000 /* LX_O_CLOEXEC */
#define EFD_NONBLOCK 04000 /* LX_O_NONBLOCK */
#define EFD_SEMAPHORE 1
/*
* These ioctl values are specific to the native implementation; applications
* shouldn't be using them directly, and they should therefore be safe to
* change without breaking apps.
*/
#define EVENTFDIOC (('e' << 24) | ('f' << 16) | ('d' << 8))
#define EVENTFDIOC_SEMAPHORE (EVENTFDIOC | 1) /* toggle sem state */
/*
* Kernel-internal method to write to eventfd while bypassing overflow limits,
* therefore avoiding potential to block as well. This is used to fulfill AIO
* behavior in LX related to eventfd notification.
*/
#define EVENTFDIOC_POST (EVENTFDIOC | 2)
#ifndef _KERNEL
extern int eventfd(unsigned int, int);
extern int eventfd_read(int, eventfd_t *);
extern int eventfd_write(int, eventfd_t);
#else
#define EVENTFDMNRN_EVENTFD 0
#define EVENTFDMNRN_CLONE 1
#define EVENTFD_VALMAX (ULLONG_MAX - 1ULL)
#define EVENTFD_VALOVERFLOW ULLONG_MAX
#endif /* _KERNEL */
#ifdef __cplusplus
}
#endif
#endif /* _SYS_EVENTFD_H */
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