/* * Copyright (c) 2003-2016 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 */ #define EVFILT_MEMORYSTATUS (-14) /* Memorystatus events */ #endif /* PRIVATE */ #define EVFILT_EXCEPT (-15) /* Exception events */ #define EVFILT_SYSCOUNT 15 #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 */ }; struct kevent_internal_s { uint64_t ident; /* identifier for this event */ int16_t filter; /* filter for event */ uint16_t flags; /* general flags */ int32_t qos; /* quality of service */ uint32_t fflags; /* filter-specific flags */ // uint32_t xflags; /* extra filter-specific flags */ int64_t data; /* filter-specific data */ uint64_t udata; /* opaque user data identifier */ uint64_t ext[4]; /* filter-specific extensions */ }; #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 */ }; #ifdef PRIVATE struct kevent_qos_s { uint64_t ident; /* identifier for this event */ int16_t filter; /* filter for event */ uint16_t flags; /* general flags */ int32_t qos; /* quality of service */ uint64_t udata; /* opaque user data identifier */ uint32_t fflags; /* filter-specific flags */ uint32_t xflags; /* extra filter-specific flags */ int64_t data; /* filter-specific data */ uint64_t ext[4]; /* filter-specific extensions */ }; #endif /* PRIVATE */ #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 0x000 /* no flag value */ #define KEVENT_FLAG_IMMEDIATE 0x001 /* immediate timeout */ #define KEVENT_FLAG_ERROR_EVENTS 0x002 /* output events only include change errors */ #ifdef PRIVATE /* * Rather than provide an EV_SET_QOS macro for kevent_qos_t structure * initialization, we encourage use of named field initialization support * instead. */ #define KEVENT_FLAG_STACK_EVENTS 0x004 /* output events treated as stack (grows down) */ #define KEVENT_FLAG_STACK_DATA 0x008 /* output data allocated as stack (grows down) */ #define KEVENT_FLAG_WORKQ 0x020 /* interact with the default workq kq */ #define KEVENT_FLAG_WORKQ_MANAGER 0x200 /* current thread is the workq manager */ #ifdef XNU_KERNEL_PRIVATE #define KEVENT_FLAG_LEGACY32 0x040 /* event data in legacy 32-bit format */ #define KEVENT_FLAG_LEGACY64 0x080 /* event data in legacy 64-bit format */ #define KEVENT_FLAG_KERNEL 0x100 /* caller is in-kernel */ #define KEVENT_FLAG_USER (KEVENT_FLAG_IMMEDIATE | KEVENT_FLAG_ERROR_EVENTS | \ KEVENT_FLAG_STACK_EVENTS | KEVENT_FLAG_STACK_DATA | \ KEVENT_FLAG_WORKQ) /* * Since some filter ops are not part of the standard sysfilt_ops, we * use kn_filtid starting from EVFILT_SYSCOUNT to identify these cases. * This is to let kn_fops() get the correct fops for all cases. */ #define EVFILTID_KQREAD (EVFILT_SYSCOUNT) #define EVFILTID_PIPE_R (EVFILT_SYSCOUNT + 1) #define EVFILTID_PIPE_W (EVFILT_SYSCOUNT + 2) #define EVFILTID_PTSD (EVFILT_SYSCOUNT + 3) #define EVFILTID_SOREAD (EVFILT_SYSCOUNT + 4) #define EVFILTID_SOWRITE (EVFILT_SYSCOUNT + 5) #define EVFILTID_SCK (EVFILT_SYSCOUNT + 6) #define EVFILTID_SOEXCEPT (EVFILT_SYSCOUNT + 7) #define EVFILTID_SPEC (EVFILT_SYSCOUNT + 8) #define EVFILTID_BPFREAD (EVFILT_SYSCOUNT + 9) #define EVFILTID_NECP_FD (EVFILT_SYSCOUNT + 10) #define EVFILTID_FSEVENT (EVFILT_SYSCOUNT + 13) #define EVFILTID_VN (EVFILT_SYSCOUNT + 14) #define EVFILTID_MAX (EVFILT_SYSCOUNT + 15) #endif /* XNU_KERNEL_PRIVATE */ #define EV_SET_QOS 0 #endif /* PRIVATE */ /* 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) */ /* * 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 only */ #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 #ifdef PRIVATE /* * If NOTE_EXIT_MEMORY is present, these bits indicate specific jetsam condition. */ #define NOTE_EXIT_MEMORY_DETAIL_MASK 0xfe000000 #define NOTE_EXIT_MEMORY_VMPAGESHORTAGE 0x80000000 /* jetsam condition: lowest jetsam priority proc killed due to vm page shortage */ #define NOTE_EXIT_MEMORY_VMTHRASHING 0x40000000 /* jetsam condition: lowest jetsam priority proc killed due to vm thrashing */ #define NOTE_EXIT_MEMORY_HIWAT 0x20000000 /* jetsam condition: process reached its high water mark */ #define NOTE_EXIT_MEMORY_PID 0x10000000 /* jetsam condition: special pid kill requested */ #define NOTE_EXIT_MEMORY_IDLE 0x08000000 /* jetsam condition: idle process cleaned up */ #define NOTE_EXIT_MEMORY_VNODE 0X04000000 /* jetsam condition: virtual node kill */ #define NOTE_EXIT_MEMORY_FCTHRASHING 0x02000000 /* jetsam condition: lowest jetsam priority proc killed due to filecache thrashing */ #endif /* * 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 */ #ifdef PRIVATE /* * data/hint fflags for EVFILT_MEMORYSTATUS, shared with userspace. */ #define NOTE_MEMORYSTATUS_PRESSURE_NORMAL 0x00000001 /* system memory pressure has returned to normal */ #define NOTE_MEMORYSTATUS_PRESSURE_WARN 0x00000002 /* system memory pressure has changed to the warning state */ #define NOTE_MEMORYSTATUS_PRESSURE_CRITICAL 0x00000004 /* system memory pressure has changed to the critical state */ #define NOTE_MEMORYSTATUS_LOW_SWAP 0x00000008 /* system is in a low-swap state */ #define NOTE_MEMORYSTATUS_PROC_LIMIT_WARN 0x00000010 /* process memory limit has hit a warning state */ #define NOTE_MEMORYSTATUS_PROC_LIMIT_CRITICAL 0x00000020 /* process memory limit has hit a critical state - soft limit */ #ifdef KERNEL_PRIVATE /* * data/hint fflags for EVFILT_MEMORYSTATUS, but not shared with userspace. */ #define NOTE_MEMORYSTATUS_PROC_LIMIT_WARN_ACTIVE 0x00000040 /* Used to restrict sending a warn event only once, per active limit, soft limits only */ #define NOTE_MEMORYSTATUS_PROC_LIMIT_WARN_INACTIVE 0x00000080 /* Used to restrict sending a warn event only once, per inactive limit, soft limit only */ #define NOTE_MEMORYSTATUS_PROC_LIMIT_CRITICAL_ACTIVE 0x00000100 /* Used to restrict sending a critical event only once per active limit, soft limit only */ #define NOTE_MEMORYSTATUS_PROC_LIMIT_CRITICAL_INACTIVE 0x00000200 /* Used to restrict sending a critical event only once per inactive limit, soft limit only */ /* * Use this mask to protect the kernel private flags. */ #define EVFILT_MEMORYSTATUS_ALL_MASK \ (NOTE_MEMORYSTATUS_PRESSURE_NORMAL | NOTE_MEMORYSTATUS_PRESSURE_WARN | NOTE_MEMORYSTATUS_PRESSURE_CRITICAL | NOTE_MEMORYSTATUS_LOW_SWAP | NOTE_MEMORYSTATUS_PROC_LIMIT_WARN | NOTE_MEMORYSTATUS_PROC_LIMIT_CRITICAL) #endif /* KERNEL_PRIVATE */ typedef enum vm_pressure_level { kVMPressureNormal = 0, kVMPressureWarning = 1, kVMPressureUrgent = 2, kVMPressureCritical = 3, } vm_pressure_level_t; #endif /* PRIVATE */ /* * 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 */ #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 /* use continuous time base */ #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 */ #define NOTE_ADAPTIVE_WTIMO 0x00000200 /* TCP adaptive write timeout */ #define NOTE_ADAPTIVE_RTIMO 0x00000400 /* TCP adaptive read timeout */ #define NOTE_CONNECTED 0x00000800 /* socket is connected */ #define NOTE_DISCONNECTED 0x00001000 /* socket is disconnected */ #define NOTE_CONNINFO_UPDATED 0x00002000 /* connection info was updated */ #define NOTE_NOTIFY_ACK 0x00004000 /* notify acknowledgement */ #define EVFILT_SOCK_LEVEL_TRIGGER_MASK \ (NOTE_READCLOSED | NOTE_WRITECLOSED | NOTE_SUSPEND | NOTE_RESUME | NOTE_CONNECTED | NOTE_DISCONNECTED) #define EVFILT_SOCK_ALL_MASK \ (NOTE_CONNRESET | NOTE_READCLOSED | NOTE_WRITECLOSED | NOTE_TIMEOUT | NOTE_NOSRCADDR | NOTE_IFDENIED | NOTE_SUSPEND | NOTE_RESUME | NOTE_KEEPALIVE | NOTE_ADAPTIVE_WTIMO | NOTE_ADAPTIVE_RTIMO | NOTE_CONNECTED | NOTE_DISCONNECTED | NOTE_CONNINFO_UPDATED | NOTE_NOTIFY_ACK) #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 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 /* 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 XNU_KERNEL_PRIVATE #include <sys/queue.h> #include <kern/kern_types.h> #ifdef MALLOC_DECLARE MALLOC_DECLARE(M_KQUEUE); #endif TAILQ_HEAD(kqtailq, knote); /* a list of "queued" events */ /* Bit size for packed field within knote */ #define KNOTE_KQ_BITSIZE 40 /* index into various kq queues */ typedef uint8_t kq_index_t; typedef uint16_t kn_status_t; #define KN_ACTIVE 0x0001 /* event has been triggered */ #define KN_QUEUED 0x0002 /* event is on queue */ #define KN_DISABLED 0x0004 /* event is disabled */ #define KN_DROPPING 0x0008 /* knote is being dropped */ #define KN_USEWAIT 0x0010 /* wait for knote use */ #define KN_ATTACHING 0x0020 /* event is pending attach */ #define KN_STAYACTIVE 0x0040 /* force event to stay active */ #define KN_DEFERDELETE 0x0080 /* defer delete until re-enabled */ #define KN_ATTACHED 0x0100 /* currently attached to source */ #define KN_DISPATCH 0x0200 /* disables as part of deliver */ #define KN_UDATA_SPECIFIC 0x0400 /* udata is part of matching */ #define KN_SUPPRESSED 0x0800 /* event is suppressed during delivery */ #define KN_STOLENDROP 0x1000 /* someone stole the drop privilege */ #define KN_REQVANISH 0x2000 /* requested EV_VANISH */ #define KN_VANISHED 0x4000 /* has vanished */ #define KN_DISPATCH2 (KN_DISPATCH | KN_UDATA_SPECIFIC) /* combination defines deferred-delete mode enabled */ struct knote { TAILQ_ENTRY(knote) kn_tqe; /* linkage for tail queue */ 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_mqueue *p_mqueue; /* pset pointer */ } kn_ptr; uint64_t kn_req_index:4, /* requested qos index */ kn_qos_index:4, /* in-use qos index */ kn_qos_override:4, /* qos override index */ kn_reserved:4, /* reserved bits */ kn_filtid:8, /* filter id to index filter ops */ kn_kq_packed:KNOTE_KQ_BITSIZE; /* packed pointer for kq */ union { void *kn_hook; uint64_t kn_hook_data; }; int64_t kn_sdata; /* saved data field */ struct kevent_internal_s kn_kevent; int kn_sfflags; /* saved filter flags */ int kn_hookid; uint16_t kn_inuse; /* inuse count */ kn_status_t kn_status; /* status bits */ #define kn_id kn_kevent.ident #define kn_filter kn_kevent.filter #define kn_flags kn_kevent.flags #define kn_qos kn_kevent.qos #define kn_udata kn_kevent.udata #define kn_fflags kn_kevent.fflags #define kn_xflags kn_kevent.xflags #define kn_data kn_kevent.data #define kn_ext kn_kevent.ext #define kn_fp kn_ptr.p_fp }; static inline struct kqueue *knote_get_kq(struct knote *kn) { if (!(kn->kn_kq_packed)) return 0; else return (struct kqueue *)((uintptr_t)(kn->kn_kq_packed) + (uintptr_t)VM_MIN_KERNEL_AND_KEXT_ADDRESS); } static inline void knote_set_kq(struct knote *kn, void *kq) { if (!kq) kn->kn_kq_packed = 0; else { uint64_t offset = ((uintptr_t)kq - (uintptr_t)VM_MIN_KERNEL_AND_KEXT_ADDRESS); kn->kn_kq_packed = offset; } } struct filt_process_s { int fp_fd; unsigned int fp_flags; user_addr_t fp_data_out; user_size_t fp_data_size; user_size_t fp_data_resid; }; typedef struct filt_process_s *filt_process_data_t; /* * Filter operators * * These routines, provided by each filter, are called to attach, detach, deliver events, * change/update filter registration and process/deliver events. They are called with the * with a use-count referenced knote, with the kq unlocked. Here are more details: * * f_isfd - * identifies if the "ident" field in the kevent structure is a file-descriptor. * * If so, the knote is associated with the file descriptor prior to attach and * auto-removed when the file descriptor is closed (this latter behavior may change * for EV_DISPATCH2 kevent types to allow delivery of events identifying unintended * closes). * * Otherwise the knote is hashed by the ident and has no auto-close behavior. * * f_attach - * called to attach the knote to the underlying object that will be delivering events * through it when EV_ADD is supplied and no existing matching event is found * * provided a knote that is pre-attached to the fd or hashed (see above) but is * specially marked to avoid concurrent access until the attach is complete. The * kevent structure embedded in this knote has been filled in with a sanitized * version of the user-supplied kevent data. However, the user-supplied filter-specific * flags (fflags) and data fields have been moved into the knote's kn_sfflags and kn_sdata * fields respectively. These are usually interpretted as a set of "interest" flags and * data by each filter - to be matched against delivered events. * * The attach operator indicated errors by setting the EV_ERROR flog in the flags field * embedded in the knote's kevent structure - with the specific error indicated in the * corresponding data field. * * The return value indicates if the knote should already be considered "activated" at * the time of attach (one or more of the interest events has already occured). * * f_detach - * called to disassociate the knote from the underlying object delivering events * the filter should not attempt to deliver events through this knote after this * operation returns control to the kq system. * * f_event - * if the knote() function (or KNOTE() macro) is called against a list of knotes, * this operator will be called on each knote in the list. * * The "hint" parameter is completely filter-specific, but usually indicates an * event or set of events that have occured against the source object associated * with the list. * * The return value indicates if the knote should already be considered "activated" at * the time of attach (one or more of the interest events has already occured). * * f_process - * called when attempting to deliver triggered events to user-space. * * If the knote was previously activated, this operator will be called when a * thread is trying to deliver events to user-space. The filter gets one last * chance to determine if the event/events are still interesting for this knote * (are the conditions still right to deliver an event). If so, the filter * fills in the output kevent structure with the information to be delivered. * * The input context/data parameter is used during event delivery. Some * filters allow additional data delivery as part of event delivery. This * context field indicates if space was made available for these additional * items and how that space is to be allocated/carved-out. * * The filter may set EV_CLEAR or EV_ONESHOT in the output flags field to indicate * special post-delivery dispositions for the knote. * * EV_CLEAR - indicates that all matching events have been delivered. Even * though there were events to deliver now, there will not be any * more until some additional events are delivered to the knote * via the f_event operator, or the interest set is changed via * the f_touch operator. The knote can remain deactivated after * processing this event delivery. * * EV_ONESHOT - indicates that this is the last event to be delivered via * this knote. It will automatically be deleted upon delivery * (or if in dispatch-mode, upon re-enablement after this delivery). * * The return value indicates if the knote has delivered an output event. * Unless one of the special output flags was set in the output kevent, a non- * zero return value ALSO indicates that the knote should be re-activated * for future event processing (in case it delivers level-based or a multi-edge * type events like message queues that already exist). * * NOTE: In the future, the boolean may change to an enum that allows more * explicit indication of just delivering a current event vs delivering * an event with more events still pending. * * f_peek - * For knotes marked KN_STAYACTIVE, indicate if the knote is truly active at * the moment (not used for event delivery, but for status checks). */ 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); int (*f_touch)(struct knote *kn, struct kevent_internal_s *kev); int (*f_process)(struct knote *kn, struct filt_process_s *data, struct kevent_internal_s *kev); unsigned (*f_peek)(struct knote *kn); }; struct proc; struct waitq; SLIST_HEAD(klist, knote); extern void knote_init(void); 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 void knote_vanish(struct klist *list); extern int knote_link_waitq(struct knote *kn, struct waitq *wq, uint64_t *reserved_link); extern int knote_unlink_waitq(struct knote *kn, struct waitq *wq); extern void knote_fdclose(struct proc *p, int fd, int force); extern void knote_markstayactive(struct knote *kn); extern void knote_clearstayactive(struct knote *kn); extern void knote_adjust_qos(struct knote *kn, int qos, int override); extern struct filterops *knote_fops(struct knote *kn); #elif defined(KERNEL_PRIVATE) /* !XNU_KERNEL_PRIVATE: kexts still need a klist structure definition */ #include <sys/queue.h> struct proc; struct knote; SLIST_HEAD(klist, knote); #endif /* !XNU_KERNEL_PRIVATE && KERNEL_PRIVATE */ #ifdef KERNEL_PRIVATE #ifdef PRIVATE /* make these private functions available to the pthread kext */ extern int kevent_qos_internal(struct proc *p, int fd, user_addr_t changelist, int nchanges, user_addr_t eventlist, int nevents, user_addr_t data_out, user_size_t *data_available, unsigned int flags, int32_t *retval); extern int kevent_qos_internal_bind(struct proc *p, int fd, thread_t thread, unsigned int flags); extern int kevent_qos_internal_unbind(struct proc *p, int fd, thread_t thread, unsigned int flags); #endif /* PRIVATE */ #endif /* KERNEL_PRIVATE */ #else /* KERNEL */ #include <sys/types.h> 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); #ifdef PRIVATE int kevent_qos(int kq, const struct kevent_qos_s *changelist, int nchanges, struct kevent_qos_s *eventlist, int nevents, void *data_out, size_t *data_available, unsigned int flags); #endif /* PRIVATE */ __END_DECLS #endif /* KERNEL */ #endif /* !_SYS_EVENT_H_ */