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Lubos Dolezel
446 lines
17 KiB
C
446 lines
17 KiB
C
/*
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* Copyright (c) 2003-2012 Apple Inc. All rights reserved.
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*
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* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
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*
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* This file contains Original Code and/or Modifications of Original Code
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* as defined in and that are subject to the Apple Public Source License
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* Version 2.0 (the 'License'). You may not use this file except in
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* compliance with the License. The rights granted to you under the License
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* may not be used to create, or enable the creation or redistribution of,
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* unlawful or unlicensed copies of an Apple operating system, or to
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* circumvent, violate, or enable the circumvention or violation of, any
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* terms of an Apple operating system software license agreement.
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*
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* Please obtain a copy of the License at
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* http://www.opensource.apple.com/apsl/ and read it before using this file.
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*
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* The Original Code and all software distributed under the License are
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* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
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* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
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* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
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* Please see the License for the specific language governing rights and
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* limitations under the License.
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*
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* @APPLE_OSREFERENCE_LICENSE_HEADER_END@
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*/
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/*-
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* Copyright (c) 1999,2000,2001 Jonathan Lemon <jlemon@FreeBSD.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD: src/sys/sys/event.h,v 1.5.2.5 2001/12/14 19:21:22 jlemon Exp $
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*/
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#ifndef _SYS_EVENT_H_
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#define _SYS_EVENT_H_
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#include <machine/types.h>
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#include <sys/cdefs.h>
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#include <stdint.h>
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#define EVFILT_READ (-1)
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#define EVFILT_WRITE (-2)
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#define EVFILT_AIO (-3) /* attached to aio requests */
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#define EVFILT_VNODE (-4) /* attached to vnodes */
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#define EVFILT_PROC (-5) /* attached to struct proc */
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#define EVFILT_SIGNAL (-6) /* attached to struct proc */
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#define EVFILT_TIMER (-7) /* timers */
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#define EVFILT_MACHPORT (-8) /* Mach portsets */
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#define EVFILT_FS (-9) /* Filesystem events */
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#define EVFILT_USER (-10) /* User events */
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/* (-11) unused */
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#define EVFILT_VM (-12) /* Virtual memory events */
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#ifdef PRIVATE
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#define EVFILT_SOCK (-13) /* Socket events */
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#endif /* PRIVATE */
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#define EVFILT_SYSCOUNT 13
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#define EVFILT_THREADMARKER EVFILT_SYSCOUNT /* Internal use only */
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#pragma pack(4)
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struct kevent {
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uintptr_t ident; /* identifier for this event */
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int16_t filter; /* filter for event */
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uint16_t flags; /* general flags */
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uint32_t fflags; /* filter-specific flags */
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intptr_t data; /* filter-specific data */
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void *udata; /* opaque user data identifier */
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};
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#ifdef KERNEL_PRIVATE
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struct user64_kevent {
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uint64_t ident; /* identifier for this event */
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int16_t filter; /* filter for event */
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uint16_t flags; /* general flags */
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uint32_t fflags; /* filter-specific flags */
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int64_t data; /* filter-specific data */
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user_addr_t udata; /* opaque user data identifier */
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};
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struct user32_kevent {
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uint32_t ident; /* identifier for this event */
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int16_t filter; /* filter for event */
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uint16_t flags; /* general flags */
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uint32_t fflags; /* filter-specific flags */
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int32_t data; /* filter-specific data */
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user32_addr_t udata; /* opaque user data identifier */
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};
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#endif
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#pragma pack()
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struct kevent64_s {
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uint64_t ident; /* identifier for this event */
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int16_t filter; /* filter for event */
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uint16_t flags; /* general flags */
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uint32_t fflags; /* filter-specific flags */
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int64_t data; /* filter-specific data */
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uint64_t udata; /* opaque user data identifier */
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uint64_t ext[2]; /* filter-specific extensions */
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};
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#define EV_SET(kevp, a, b, c, d, e, f) do { \
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struct kevent *__kevp__ = (kevp); \
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__kevp__->ident = (a); \
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__kevp__->filter = (b); \
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__kevp__->flags = (c); \
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__kevp__->fflags = (d); \
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__kevp__->data = (e); \
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__kevp__->udata = (f); \
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} while(0)
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#define EV_SET64(kevp, a, b, c, d, e, f, g, h) do { \
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struct kevent64_s *__kevp__ = (kevp); \
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__kevp__->ident = (a); \
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__kevp__->filter = (b); \
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__kevp__->flags = (c); \
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__kevp__->fflags = (d); \
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__kevp__->data = (e); \
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__kevp__->udata = (f); \
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__kevp__->ext[0] = (g); \
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__kevp__->ext[1] = (h); \
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} while(0)
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/* actions */
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#define EV_ADD 0x0001 /* add event to kq (implies enable) */
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#define EV_DELETE 0x0002 /* delete event from kq */
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#define EV_ENABLE 0x0004 /* enable event */
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#define EV_DISABLE 0x0008 /* disable event (not reported) */
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#define EV_RECEIPT 0x0040 /* force EV_ERROR on success, data == 0 */
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/* flags */
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#define EV_ONESHOT 0x0010 /* only report one occurrence */
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#define EV_CLEAR 0x0020 /* clear event state after reporting */
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#define EV_DISPATCH 0x0080 /* disable event after reporting */
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#define EV_SYSFLAGS 0xF000 /* reserved by system */
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#define EV_FLAG0 0x1000 /* filter-specific flag */
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#define EV_FLAG1 0x2000 /* filter-specific flag */
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/* returned values */
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#define EV_EOF 0x8000 /* EOF detected */
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#define EV_ERROR 0x4000 /* error, data contains errno */
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/*
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* Filter specific flags for EVFILT_READ
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*
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* The default behavior for EVFILT_READ is to make the "read" determination
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* relative to the current file descriptor read pointer. The EV_POLL
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* flag indicates the determination should be made via poll(2) semantics
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* (which always returns true for regular files - regardless of the amount
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* of unread data in the file).
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*
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* On input, EV_OOBAND specifies that only OOB data should be looked for.
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* The returned data count is the number of bytes beyond the current OOB marker.
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*
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* On output, EV_OOBAND indicates that OOB data is present
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* If it was not specified as an input parameter, then the data count is the
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* number of bytes before the current OOB marker. If at the marker, the
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* data count indicates the number of bytes available after it. In either
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* case, it's the amount of data one could expect to receive next.
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*/
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#define EV_POLL EV_FLAG0
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#define EV_OOBAND EV_FLAG1
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/*
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* data/hint fflags for EVFILT_USER, shared with userspace
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*/
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/*
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* On input, NOTE_TRIGGER causes the event to be triggered for output.
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*/
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#define NOTE_TRIGGER 0x01000000
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/*
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* On input, the top two bits of fflags specifies how the lower twenty four
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* bits should be applied to the stored value of fflags.
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*
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* On output, the top two bits will always be set to NOTE_FFNOP and the
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* remaining twenty four bits will contain the stored fflags value.
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*/
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#define NOTE_FFNOP 0x00000000 /* ignore input fflags */
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#define NOTE_FFAND 0x40000000 /* and fflags */
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#define NOTE_FFOR 0x80000000 /* or fflags */
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#define NOTE_FFCOPY 0xc0000000 /* copy fflags */
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#define NOTE_FFCTRLMASK 0xc0000000 /* mask for operations */
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#define NOTE_FFLAGSMASK 0x00ffffff
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/*
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* data/hint fflags for EVFILT_{READ|WRITE}, shared with userspace
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*
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* The default behavior for EVFILT_READ is to make the determination
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* realtive to the current file descriptor read pointer.
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*/
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#define NOTE_LOWAT 0x00000001 /* low water mark */
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/*
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* data/hint fflags for EVFILT_VNODE, shared with userspace
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*/
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#define NOTE_DELETE 0x00000001 /* vnode was removed */
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#define NOTE_WRITE 0x00000002 /* data contents changed */
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#define NOTE_EXTEND 0x00000004 /* size increased */
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#define NOTE_ATTRIB 0x00000008 /* attributes changed */
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#define NOTE_LINK 0x00000010 /* link count changed */
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#define NOTE_RENAME 0x00000020 /* vnode was renamed */
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#define NOTE_REVOKE 0x00000040 /* vnode access was revoked */
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#define NOTE_NONE 0x00000080 /* No specific vnode event: to test for EVFILT_READ activation*/
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/*
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* data/hint fflags for EVFILT_PROC, shared with userspace
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*
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* Please note that EVFILT_PROC and EVFILT_SIGNAL share the same knote list
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* that hangs off the proc structure. They also both play games with the hint
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* passed to KNOTE(). If NOTE_SIGNAL is passed as a hint, then the lower bits
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* of the hint contain the signal. IF NOTE_FORK is passed, then the lower bits
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* contain the PID of the child.
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*/
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#define NOTE_EXIT 0x80000000 /* process exited */
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#define NOTE_FORK 0x40000000 /* process forked */
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#define NOTE_EXEC 0x20000000 /* process exec'd */
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#define NOTE_REAP 0x10000000 /* process reaped */
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#define NOTE_SIGNAL 0x08000000 /* shared with EVFILT_SIGNAL */
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#define NOTE_EXITSTATUS 0x04000000 /* exit status to be returned, valid for child process only */
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#define NOTE_RESOURCEEND 0x02000000 /* resource limit reached, resource type returned */
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#if CONFIG_EMBEDDED
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/* 0x01000000 is reserved for future use */
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/* App states notification */
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#define NOTE_APPACTIVE 0x00800000 /* app went to active state */
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#define NOTE_APPBACKGROUND 0x00400000 /* app went to background */
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#define NOTE_APPNONUI 0x00200000 /* app went to active with no UI */
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#define NOTE_APPINACTIVE 0x00100000 /* app went to inactive state */
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#define NOTE_APPALLSTATES 0x00f00000
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#endif /* CONFIG_EMBEDDED */
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#define NOTE_PDATAMASK 0x000fffff /* mask for pid/signal */
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#define NOTE_PCTRLMASK (~NOTE_PDATAMASK)
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/*
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* data/hint fflags for EVFILT_VM, shared with userspace.
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*/
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#define NOTE_VM_PRESSURE 0x80000000 /* will react on memory pressure */
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#define NOTE_VM_PRESSURE_TERMINATE 0x40000000 /* will quit on memory pressure, possibly after cleaning up dirty state */
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#define NOTE_VM_PRESSURE_SUDDEN_TERMINATE 0x20000000 /* will quit immediately on memory pressure */
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#define NOTE_VM_ERROR 0x10000000 /* there was an error */
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/*
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* data/hint fflags for EVFILT_TIMER, shared with userspace.
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* The default is a (repeating) interval timer with the data
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* specifying the timeout interval in milliseconds.
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*
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* All timeouts are implicitly EV_CLEAR events.
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*/
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#define NOTE_SECONDS 0x00000001 /* data is seconds */
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#define NOTE_USECONDS 0x00000002 /* data is microseconds */
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#define NOTE_NSECONDS 0x00000004 /* data is nanoseconds */
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#define NOTE_ABSOLUTE 0x00000008 /* absolute timeout */
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/* ... implicit EV_ONESHOT */
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#ifdef PRIVATE
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/*
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* data/hint fflags for EVFILT_SOCK, shared with userspace.
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*
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*/
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#define NOTE_CONNRESET 0x00000001 /* Received RST */
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#define NOTE_READCLOSED 0x00000002 /* Read side is shutdown */
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#define NOTE_WRITECLOSED 0x00000004 /* Write side is shutdown */
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#define NOTE_TIMEOUT 0x00000008 /* timeout: rexmt, keep-alive or persist */
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#define NOTE_NOSRCADDR 0x00000010 /* source address not available */
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#define NOTE_IFDENIED 0x00000020 /* interface denied connection */
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#define NOTE_SUSPEND 0x00000040 /* output queue suspended */
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#define NOTE_RESUME 0x00000080 /* output queue resumed */
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#define NOTE_KEEPALIVE 0x00000100 /* TCP Keepalive received */
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#endif /* PRIVATE */
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/*
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* data/hint fflags for EVFILT_MACHPORT, shared with userspace.
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*
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* Only portsets are supported at this time.
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*
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* The fflags field can optionally contain the MACH_RCV_MSG, MACH_RCV_LARGE,
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* and related trailer receive options as defined in <mach/message.h>.
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* The presence of these flags directs the kevent64() call to attempt to receive
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* the message during kevent delivery, rather than just indicate that a message exists.
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* On setup, The ext[0] field contains the receive buffer pointer and ext[1] contains
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* the receive buffer length. Upon event delivery, the actual received message size
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* is returned in ext[1]. As with mach_msg(), the buffer must be large enough to
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* receive the message and the requested (or default) message trailers. In addition,
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* the fflags field contains the return code normally returned by mach_msg().
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*
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* If no message receipt options were provided in the fflags field on setup, no
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* message is received by this call. Instead, on output, the data field simply
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* contains the name of the actual port detected with a message waiting.
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*/
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/*
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* DEPRECATED!!!!!!!!!
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* NOTE_TRACK, NOTE_TRACKERR, and NOTE_CHILD are no longer supported as of 10.5
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*/
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/* additional flags for EVFILT_PROC */
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#define NOTE_TRACK 0x00000001 /* follow across forks */
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#define NOTE_TRACKERR 0x00000002 /* could not track child */
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#define NOTE_CHILD 0x00000004 /* am a child process */
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#ifndef KERNEL
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/* Temporay solution for BootX to use inode.h till kqueue moves to vfs layer */
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#include <sys/queue.h>
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struct knote;
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SLIST_HEAD(klist, knote);
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#endif
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#ifdef KERNEL
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#ifdef KERNEL_PRIVATE
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#include <sys/queue.h>
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#ifdef MALLOC_DECLARE
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MALLOC_DECLARE(M_KQUEUE);
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#endif
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TAILQ_HEAD(kqtailq, knote); /* a list of "queued" events */
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struct knote {
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int kn_inuse; /* inuse count */
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struct kqtailq *kn_tq; /* pointer to tail queue */
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TAILQ_ENTRY(knote) kn_tqe; /* linkage for tail queue */
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struct kqueue *kn_kq; /* which kqueue we are on */
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SLIST_ENTRY(knote) kn_link; /* linkage for search list */
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SLIST_ENTRY(knote) kn_selnext; /* klist element chain */
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union {
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struct fileproc *p_fp; /* file data pointer */
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struct proc *p_proc; /* proc pointer */
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struct ipc_pset *p_pset; /* pset pointer */
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} kn_ptr;
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struct filterops *kn_fop;
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int kn_status; /* status bits */
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int kn_sfflags; /* saved filter flags */
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struct kevent64_s kn_kevent;
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void *kn_hook;
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int kn_hookid;
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int64_t kn_sdata; /* saved data field */
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#define KN_ACTIVE 0x01 /* event has been triggered */
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#define KN_QUEUED 0x02 /* event is on queue */
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#define KN_DISABLED 0x04 /* event is disabled */
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#define KN_DROPPING 0x08 /* knote is being dropped */
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#define KN_USEWAIT 0x10 /* wait for knote use */
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#define KN_ATTACHING 0x20 /* event is pending attach */
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#define KN_STAYQUEUED 0x40 /* force event to stay on queue */
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#define kn_id kn_kevent.ident
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#define kn_filter kn_kevent.filter
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#define kn_flags kn_kevent.flags
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#define kn_fflags kn_kevent.fflags
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#define kn_data kn_kevent.data
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#define kn_udata kn_kevent.udata
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#define kn_ext kn_kevent.ext
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#define kn_fp kn_ptr.p_fp
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};
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/* Hint values for f_touch filter operation */
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#define EVENT_REGISTER 1
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#define EVENT_PROCESS 2
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struct filterops {
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int f_isfd; /* true if ident == filedescriptor */
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int (*f_attach)(struct knote *kn);
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void (*f_detach)(struct knote *kn);
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int (*f_event)(struct knote *kn, long hint);
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/* Optional f_touch operation, called only if !f_isfd && non-NULL */
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void (*f_touch)(struct knote *kn, struct kevent64_s *kev, long type);
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/* Optional f_peek operation, called only if KN_STAYQUEUED is set */
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unsigned (*f_peek)(struct knote *kn);
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};
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struct proc;
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struct wait_queue;
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SLIST_HEAD(klist, knote);
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extern void knote_init(void) __attribute__((section("__TEXT, initcode")));
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extern void klist_init(struct klist *list);
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#define KNOTE(list, hint) knote(list, hint)
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#define KNOTE_ATTACH(list, kn) knote_attach(list, kn)
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#define KNOTE_DETACH(list, kn) knote_detach(list, kn)
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extern void knote(struct klist *list, long hint);
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extern int knote_attach(struct klist *list, struct knote *kn);
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extern int knote_detach(struct klist *list, struct knote *kn);
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extern int knote_link_wait_queue(struct knote *kn, struct wait_queue *wq, wait_queue_link_t wql);
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extern int knote_unlink_wait_queue(struct knote *kn, struct wait_queue *wq, wait_queue_link_t *wqlp);
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extern void knote_fdclose(struct proc *p, int fd);
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extern void knote_markstayqueued(struct knote *kn);
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#endif /* !KERNEL_PRIVATE */
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#else /* KERNEL */
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struct timespec;
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__BEGIN_DECLS
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int kqueue(void);
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int kevent(int kq, const struct kevent *changelist, int nchanges,
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struct kevent *eventlist, int nevents,
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const struct timespec *timeout);
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int kevent64(int kq, const struct kevent64_s *changelist,
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int nchanges, struct kevent64_s *eventlist,
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int nevents, unsigned int flags,
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const struct timespec *timeout);
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__END_DECLS
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#endif /* KERNEL */
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#endif /* !_SYS_EVENT_H_ */
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