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