/* * Copyright (c) 2003-2021 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 * 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 #include #include #include #ifndef KERNEL #include #endif /* * Filter types */ #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 */ #ifdef PRIVATE /* Additional filter types in event_private.h */ #endif #define EVFILT_VM (-12) /* Virtual memory events */ #define EVFILT_EXCEPT (-15) /* Exception events */ #ifdef PRIVATE /* Make sure to count the filter types in event_private.h! */ #endif #define EVFILT_SYSCOUNT 18 #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 */ }; #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) /* kevent system call flags */ #define KEVENT_FLAG_NONE 0x000000 /* no flag value */ #define KEVENT_FLAG_IMMEDIATE 0x000001 /* immediate timeout */ #define KEVENT_FLAG_ERROR_EVENTS 0x000002 /* output events only include change errors */ /* 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) */ /* flags */ #define EV_ONESHOT 0x0010 /* only report one occurrence */ #define EV_CLEAR 0x0020 /* clear event state after reporting */ #define EV_RECEIPT 0x0040 /* force immediate event output */ /* ... with or without EV_ERROR */ /* ... use KEVENT_FLAG_ERROR_EVENTS */ /* on syscalls supporting flags */ #define EV_DISPATCH 0x0080 /* disable event after reporting */ #define EV_UDATA_SPECIFIC 0x0100 /* unique kevent per udata value */ #define EV_DISPATCH2 (EV_DISPATCH | EV_UDATA_SPECIFIC) /* ... in combination with EV_DELETE */ /* will defer delete until udata-specific */ /* event enabled. EINPROGRESS will be */ /* returned to indicate the deferral */ #define EV_VANISHED 0x0200 /* report that source has vanished */ /* ... only valid with EV_DISPATCH2 */ #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. These semantics dictate always returning true for regular files, * regardless of the amount of unread data in the file. * * On input, EV_OOBAND specifies that filter should actively return in the * presence of OOB on the descriptor. It implies that filter will return * if there is OOB data available to read OR when any other condition * for the read are met (for example number of bytes regular data becomes >= * low-watermark). * If EV_OOBAND is not set on input, it implies that the filter should not actively * return for out of band data on the descriptor. The filter will then only return * when some other condition for read is met (ex: when number of regular data bytes * >=low-watermark OR when socket can't receive more data (SS_CANTRCVMORE)). * * On output, EV_OOBAND indicates the presence of OOB data on the descriptor. * If it was not specified as an input parameter, then the data count is the * number of bytes before the current OOB marker, else data count is the number * of bytes beyond OOB marker. */ #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 flags for EVFILT_EXCEPT, shared with userspace */ #define NOTE_OOB 0x00000002 /* OOB data */ /* * 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*/ #define NOTE_FUNLOCK 0x00000100 /* vnode was unlocked by flock(2) */ #define NOTE_LEASE_DOWNGRADE 0x00000200 /* lease downgrade requested */ #define NOTE_LEASE_RELEASE 0x00000400 /* lease release requested */ /* * 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 (but the pid does not get passed through in * the actual kevent). */ enum { eNoteReapDeprecated __deprecated_enum_msg("This kqueue(2) EVFILT_PROC flag is deprecated") = 0x10000000 }; #define NOTE_EXIT 0x80000000 /* process exited */ #define NOTE_FORK 0x40000000 /* process forked */ #define NOTE_EXEC 0x20000000 /* process exec'd */ #define NOTE_REAP ((unsigned int)eNoteReapDeprecated /* 0x10000000 */ ) /* process reaped */ #define NOTE_SIGNAL 0x08000000 /* shared with EVFILT_SIGNAL */ #define NOTE_EXITSTATUS 0x04000000 /* exit status to be returned, valid for child process or when allowed to signal target pid */ #define NOTE_EXIT_DETAIL 0x02000000 /* provide details on reasons for exit */ #define NOTE_PDATAMASK 0x000fffff /* mask for signal & exit status */ #define NOTE_PCTRLMASK (~NOTE_PDATAMASK) /* * If NOTE_EXITSTATUS is present, provide additional info about exiting process. */ enum { eNoteExitReparentedDeprecated __deprecated_enum_msg("This kqueue(2) EVFILT_PROC flag is no longer sent") = 0x00080000 }; #define NOTE_EXIT_REPARENTED ((unsigned int)eNoteExitReparentedDeprecated) /* exited while reparented */ /* * If NOTE_EXIT_DETAIL is present, these bits indicate specific reasons for exiting. */ #define NOTE_EXIT_DETAIL_MASK 0x00070000 #define NOTE_EXIT_DECRYPTFAIL 0x00010000 #define NOTE_EXIT_MEMORY 0x00020000 #define NOTE_EXIT_CSERROR 0x00040000 /* * 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, timeout uses the gettimeofday epoch */ #define NOTE_LEEWAY 0x00000010 /* ext[1] holds leeway for power aware timers */ #define NOTE_CRITICAL 0x00000020 /* system does minimal timer coalescing */ #define NOTE_BACKGROUND 0x00000040 /* system does maximum timer coalescing */ #define NOTE_MACH_CONTINUOUS_TIME 0x00000080 /* * NOTE_MACH_CONTINUOUS_TIME: * with NOTE_ABSOLUTE: causes the timer to continue to tick across sleep, * still uses gettimeofday epoch * with NOTE_MACHTIME and NOTE_ABSOLUTE: uses mach continuous time epoch * without NOTE_ABSOLUTE (interval timer mode): continues to tick across sleep */ #define NOTE_MACHTIME 0x00000100 /* data is mach absolute time units */ /* timeout uses the mach absolute time epoch */ /* * 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 . * 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 MACH_RCV_MSG is specified, and the ext[1] field specifies a zero length, the * system call argument specifying an ouput area (kevent_qos) will be consulted. If * the system call specified an output data area, the user-space address * of the received message is carved from that provided output data area (if enough * space remains there). The address and length of each received message is * returned in the ext[0] and ext[1] fields (respectively) of the corresponding kevent. * * IF_MACH_RCV_VOUCHER_CONTENT is specified, the contents of the message voucher is * extracted (as specified in the xflags field) and stored in ext[2] up to ext[3] * length. If the input length is zero, and the system call provided a data area, * the space for the voucher content is carved from the provided space and its * address and length is returned in ext[2] and ext[3] respectively. * * 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 /* Temporary solution for BootX to use inode.h till kqueue moves to vfs layer */ struct knote; SLIST_HEAD(klist, knote); 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 */ #ifdef PRIVATE #include #endif /* PRIVATE */ #endif /* !_SYS_EVENT_H_ */