/*
- * Copyright (c) 2003-2012 Apple Inc. All rights reserved.
+ * Copyright (c) 2003-2016 Apple Inc. All rights reserved.
*
* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
*
#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 13
+#define EVFILT_SYSCOUNT 15
#define EVFILT_THREADMARKER EVFILT_SYSCOUNT /* Internal use only */
#pragma pack(4)
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 */
+ 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
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__->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) */
-#define EV_RECEIPT 0x0040 /* force EV_ERROR on success, data == 0 */
+#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_DISPATCH 0x0080 /* disable event after reporting */
+#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 */
+#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 */
+#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).
+ * relative to the current file descriptor read pointer.
*
- * 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.
+ * 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 output, EV_OOBAND indicates that OOB data is present
+ * 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. 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.
+ * 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_POLL EV_FLAG0
#define EV_OOBAND EV_FLAG1
/*
* 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_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
* 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.
+ * contain the PID of the child (but the pid does not get passed through in
+ * the actual kevent).
*/
-#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 */
+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.
*/
-#define NOTE_EXIT_REPARENTED 0x00080000 /* exited while reparented */
+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_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 */
+
+typedef enum vm_pressure_level {
+ kVMPressureNormal = 0,
+ kVMPressureWarning = 1,
+ kVMPressureUrgent = 2,
+ kVMPressureCritical = 3,
+} vm_pressure_level_t;
+
+#endif
+
/*
* data/hint fflags for EVFILT_TIMER, shared with userspace.
* The default is a (repeating) interval timer with the data
#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_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 */
* 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.
#ifdef KERNEL
-#ifdef KERNEL_PRIVATE
+#ifdef XNU_KERNEL_PRIVATE
#include <sys/queue.h>
+#include <kern/kern_types.h>
#ifdef MALLOC_DECLARE
MALLOC_DECLARE(M_KQUEUE);
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 */
+/* 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 __attribute__((__packed__)) knote {
+ uint16_t kn_inuse; /* inuse count */
+ kn_status_t kn_status; /* status bits */
+ int kn_hookid;
+ 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_pset *p_pset; /* pset pointer */
+ struct fileproc *p_fp; /* file data pointer */
+ struct proc *p_proc; /* proc pointer */
+ struct ipc_mqueue *p_mqueue; /* 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 */
+ 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 */
+
+ int kn_sfflags; /* saved filter flags */
+ union {
+ void *kn_hook;
+ uint64_t kn_hook_data;
+ };
+ int64_t kn_sdata; /* saved data field */
+ struct kevent_internal_s kn_kevent;
#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_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
+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);
- /* 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 */
+ 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 wait_queue;
+struct waitq;
SLIST_HEAD(klist, knote);
-extern void knote_init(void) __attribute__((section("__TEXT, initcode")));
+extern void knote_init(void);
extern void klist_init(struct klist *list);
#define KNOTE(list, hint) knote(list, hint)
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);
+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
-#endif /* !KERNEL_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);
+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
projects / apple / xnu.git / blobdiff