/*
- * Copyright (c) 2000-2005 Apple Computer, Inc. All rights reserved.
+ * Copyright (c) 2000-2014 Apple Inc. All rights reserved.
*
- * @APPLE_LICENSE_OSREFERENCE_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.
+ * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
*
- * Please obtain a copy of the License at
- * http://www.opensource.apple.com/apsl/ and read it before using this
- * file.
+ * 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.
*
- * 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
+ * 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_LICENSE_OSREFERENCE_HEADER_END@
+ * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
*
*/
/*-
#include <sys/kernel.h>
#include <sys/proc_internal.h>
#include <sys/kauth.h>
-#include <sys/malloc.h>
+#include <sys/malloc.h>
#include <sys/unistd.h>
#include <sys/file_internal.h>
#include <sys/fcntl.h>
#include <sys/uio.h>
#include <sys/sysproto.h>
#include <sys/user.h>
+#include <sys/vnode_internal.h>
#include <string.h>
#include <sys/proc_info.h>
+#include <sys/codesign.h>
-#include <kern/lock.h>
+#include <kern/locks.h>
#include <kern/clock.h>
#include <kern/thread_call.h>
#include <kern/sched_prim.h>
+#include <kern/wait_queue.h>
#include <kern/zalloc.h>
#include <kern/assert.h>
#include <libkern/libkern.h>
+#include "net/net_str_id.h"
+
+#include <mach/task.h>
+
+#if VM_PRESSURE_EVENTS
+#include <kern/vm_pressure.h>
+#endif
-extern void unix_syscall_return(int);
+#if CONFIG_MEMORYSTATUS
+#include <sys/kern_memorystatus.h>
+#endif
MALLOC_DEFINE(M_KQUEUE, "kqueue", "memory for kqueue system");
+#define KQ_EVENT NULL
+
static inline void kqlock(struct kqueue *kq);
static inline void kqunlock(struct kqueue *kq);
-static int kqlock2knoteuse(struct kqueue *kq, struct knote *kn);
-static int kqlock2knoteusewait(struct kqueue *kq, struct knote *kn);
-static int kqlock2knotedrop(struct kqueue *kq, struct knote *kn);
-static int knoteuse2kqlock(struct kqueue *kq, struct knote *kn);
-
-static void kqueue_wakeup(struct kqueue *kq);
-static int kqueue_read(struct fileproc *fp, struct uio *uio,
- kauth_cred_t cred, int flags, struct proc *p);
-static int kqueue_write(struct fileproc *fp, struct uio *uio,
- kauth_cred_t cred, int flags, struct proc *p);
-static int kqueue_ioctl(struct fileproc *fp, u_long com, caddr_t data,
- struct proc *p);
-static int kqueue_select(struct fileproc *fp, int which, void *wql,
- struct proc *p);
-static int kqueue_close(struct fileglob *fp, struct proc *p);
-static int kqueue_kqfilter(struct fileproc *fp, struct knote *kn, struct proc *p);
-extern int kqueue_stat(struct fileproc *fp, struct stat *st, struct proc *p);
-
-static struct fileops kqueueops = {
- kqueue_read,
- kqueue_write,
- kqueue_ioctl,
- kqueue_select,
- kqueue_close,
- kqueue_kqfilter,
- 0
+static int kqlock2knoteuse(struct kqueue *kq, struct knote *kn);
+static int kqlock2knoteusewait(struct kqueue *kq, struct knote *kn);
+static int kqlock2knotedrop(struct kqueue *kq, struct knote *kn);
+static int knoteuse2kqlock(struct kqueue *kq, struct knote *kn);
+
+static void kqueue_wakeup(struct kqueue *kq, int closed);
+static int kqueue_read(struct fileproc *fp, struct uio *uio,
+ int flags, vfs_context_t ctx);
+static int kqueue_write(struct fileproc *fp, struct uio *uio,
+ int flags, vfs_context_t ctx);
+static int kqueue_ioctl(struct fileproc *fp, u_long com, caddr_t data,
+ vfs_context_t ctx);
+static int kqueue_select(struct fileproc *fp, int which, void *wql,
+ vfs_context_t ctx);
+static int kqueue_close(struct fileglob *fg, vfs_context_t ctx);
+static int kqueue_kqfilter(struct fileproc *fp, struct knote *kn,
+ vfs_context_t ctx);
+static int kqueue_drain(struct fileproc *fp, vfs_context_t ctx);
+
+static const struct fileops kqueueops = {
+ .fo_type = DTYPE_KQUEUE,
+ .fo_read = kqueue_read,
+ .fo_write = kqueue_write,
+ .fo_ioctl = kqueue_ioctl,
+ .fo_select = kqueue_select,
+ .fo_close = kqueue_close,
+ .fo_kqfilter = kqueue_kqfilter,
+ .fo_drain = kqueue_drain,
+};
+
+static int kevent_internal(struct proc *p, int iskev64, user_addr_t changelist,
+ int nchanges, user_addr_t eventlist, int nevents, int fd,
+ user_addr_t utimeout, unsigned int flags, int32_t *retval);
+static int kevent_copyin(user_addr_t *addrp, struct kevent64_s *kevp,
+ struct proc *p, int iskev64);
+static int kevent_copyout(struct kevent64_s *kevp, user_addr_t *addrp,
+ struct proc *p, int iskev64);
+char * kevent_description(struct kevent64_s *kevp, char *s, size_t n);
+
+static int kevent_callback(struct kqueue *kq, struct kevent64_s *kevp,
+ void *data);
+static void kevent_continue(struct kqueue *kq, void *data, int error);
+static void kqueue_scan_continue(void *contp, wait_result_t wait_result);
+static int kqueue_process(struct kqueue *kq, kevent_callback_t callback,
+ void *data, int *countp, struct proc *p);
+static int kqueue_begin_processing(struct kqueue *kq);
+static void kqueue_end_processing(struct kqueue *kq);
+static int knote_process(struct knote *kn, kevent_callback_t callback,
+ void *data, struct kqtailq *inprocessp, struct proc *p);
+static void knote_put(struct knote *kn);
+static int knote_fdpattach(struct knote *kn, struct filedesc *fdp,
+ struct proc *p);
+static void knote_drop(struct knote *kn, struct proc *p);
+static void knote_activate(struct knote *kn, int);
+static void knote_deactivate(struct knote *kn);
+static void knote_enqueue(struct knote *kn);
+static void knote_dequeue(struct knote *kn);
+static struct knote *knote_alloc(void);
+static void knote_free(struct knote *kn);
+
+static int filt_fileattach(struct knote *kn);
+static struct filterops file_filtops = {
+ .f_isfd = 1,
+ .f_attach = filt_fileattach,
};
-static int kevent_copyin(user_addr_t *addrp, struct kevent *kevp, struct proc *p);
-static int kevent_copyout(struct kevent *kevp, user_addr_t *addrp, struct proc *p);
-
-static int kevent_callback(struct kqueue *kq, struct kevent *kevp, void *data);
-static void kevent_continue(struct kqueue *kq, void *data, int error);
-static void kevent_scan_continue(void *contp, wait_result_t wait_result);
-static int kevent_process(struct kqueue *kq, kevent_callback_t callback,
- void *data, int *countp, struct proc *p);
-static void knote_put(struct knote *kn);
-static int knote_fdpattach(struct knote *kn, struct filedesc *fdp, struct proc *p);
-static void knote_drop(struct knote *kn, struct proc *p);
-static void knote_activate(struct knote *kn);
-static void knote_deactivate(struct knote *kn);
-static void knote_enqueue(struct knote *kn);
-static void knote_dequeue(struct knote *kn);
-static struct knote *knote_alloc(void);
-static void knote_free(struct knote *kn);
-extern void knote_init(void);
-
-static int filt_fileattach(struct knote *kn);
-static struct filterops file_filtops =
- { 1, filt_fileattach, NULL, NULL };
-
-static void filt_kqdetach(struct knote *kn);
-static int filt_kqueue(struct knote *kn, long hint);
-static struct filterops kqread_filtops =
- { 1, NULL, filt_kqdetach, filt_kqueue };
+static void filt_kqdetach(struct knote *kn);
+static int filt_kqueue(struct knote *kn, long hint);
+static struct filterops kqread_filtops = {
+ .f_isfd = 1,
+ .f_detach = filt_kqdetach,
+ .f_event = filt_kqueue,
+};
-/*
- * placeholder for not-yet-implemented filters
- */
-static int filt_badattach(struct knote *kn);
-static struct filterops bad_filtops =
- { 0, filt_badattach, 0 , 0 };
+/* placeholder for not-yet-implemented filters */
+static int filt_badattach(struct knote *kn);
+static struct filterops bad_filtops = {
+ .f_attach = filt_badattach,
+};
-static int filt_procattach(struct knote *kn);
-static void filt_procdetach(struct knote *kn);
-static int filt_proc(struct knote *kn, long hint);
+static int filt_procattach(struct knote *kn);
+static void filt_procdetach(struct knote *kn);
+static int filt_proc(struct knote *kn, long hint);
+static struct filterops proc_filtops = {
+ .f_attach = filt_procattach,
+ .f_detach = filt_procdetach,
+ .f_event = filt_proc,
+};
+
+#if VM_PRESSURE_EVENTS
+static int filt_vmattach(struct knote *kn);
+static void filt_vmdetach(struct knote *kn);
+static int filt_vm(struct knote *kn, long hint);
+static struct filterops vm_filtops = {
+ .f_attach = filt_vmattach,
+ .f_detach = filt_vmdetach,
+ .f_event = filt_vm,
+};
+#endif /* VM_PRESSURE_EVENTS */
-static struct filterops proc_filtops =
- { 0, filt_procattach, filt_procdetach, filt_proc };
+#if CONFIG_MEMORYSTATUS
+extern struct filterops memorystatus_filtops;
+#endif /* CONFIG_MEMORYSTATUS */
extern struct filterops fs_filtops;
extern struct filterops sig_filtops;
-
/* Timer filter */
-static int filt_timercompute(struct knote *kn, uint64_t *abs_time);
-static void filt_timerexpire(void *knx, void *param1);
-static int filt_timerattach(struct knote *kn);
-static void filt_timerdetach(struct knote *kn);
-static int filt_timer(struct knote *kn, long hint);
+static int filt_timerattach(struct knote *kn);
+static void filt_timerdetach(struct knote *kn);
+static int filt_timer(struct knote *kn, long hint);
+static void filt_timertouch(struct knote *kn, struct kevent64_s *kev,
+ long type);
+static struct filterops timer_filtops = {
+ .f_attach = filt_timerattach,
+ .f_detach = filt_timerdetach,
+ .f_event = filt_timer,
+ .f_touch = filt_timertouch,
+};
-static struct filterops timer_filtops =
- { 0, filt_timerattach, filt_timerdetach, filt_timer };
+/* Helpers */
+static void filt_timerexpire(void *knx, void *param1);
+static int filt_timervalidate(struct knote *kn);
+static void filt_timerupdate(struct knote *kn);
+static void filt_timercancel(struct knote *kn);
-/* to avoid arming timers that fire quicker than we can handle */
-static uint64_t filt_timerfloor = 0;
+#define TIMER_RUNNING 0x1
+#define TIMER_CANCELWAIT 0x2
static lck_mtx_t _filt_timerlock;
-static void filt_timerlock(void);
-static void filt_timerunlock(void);
-
-/*
- * Sentinel marker for a thread scanning through the list of
- * active knotes.
- */
-static struct filterops threadmarker_filtops =
- { 0, filt_badattach, 0, 0 };
+static void filt_timerlock(void);
+static void filt_timerunlock(void);
-static zone_t knote_zone;
+static zone_t knote_zone;
-#define KN_HASHSIZE 64 /* XXX should be tunable */
-#define KN_HASH(val, mask) (((val) ^ (val >> 8)) & (mask))
+#define KN_HASH(val, mask) (((val) ^ (val >> 8)) & (mask))
#if 0
extern struct filterops aio_filtops;
#endif
+/* Mach portset filter */
+extern struct filterops machport_filtops;
+
+/* User filter */
+static int filt_userattach(struct knote *kn);
+static void filt_userdetach(struct knote *kn);
+static int filt_user(struct knote *kn, long hint);
+static void filt_usertouch(struct knote *kn, struct kevent64_s *kev,
+ long type);
+static struct filterops user_filtops = {
+ .f_attach = filt_userattach,
+ .f_detach = filt_userdetach,
+ .f_event = filt_user,
+ .f_touch = filt_usertouch,
+};
+
/*
- * Table for for all system-defined filters.
+ * Table for all system-defined filters.
*/
static struct filterops *sysfilt_ops[] = {
&file_filtops, /* EVFILT_READ */
&proc_filtops, /* EVFILT_PROC */
&sig_filtops, /* EVFILT_SIGNAL */
&timer_filtops, /* EVFILT_TIMER */
- &bad_filtops, /* EVFILT_MACHPORT */
- &fs_filtops /* EVFILT_FS */
+ &machport_filtops, /* EVFILT_MACHPORT */
+ &fs_filtops, /* EVFILT_FS */
+ &user_filtops, /* EVFILT_USER */
+ &bad_filtops, /* unused */
+#if VM_PRESSURE_EVENTS
+ &vm_filtops, /* EVFILT_VM */
+#else
+ &bad_filtops, /* EVFILT_VM */
+#endif
+ &file_filtops, /* EVFILT_SOCK */
+#if CONFIG_MEMORYSTATUS
+ &memorystatus_filtops, /* EVFILT_MEMORYSTATUS */
+#else
+ &bad_filtops, /* EVFILT_MEMORYSTATUS */
+#endif
};
/*
lck_spin_unlock(&kq->kq_lock);
}
-/*
+/*
* Convert a kq lock to a knote use referece.
*
* If the knote is being dropped, we can't get
* a use reference, so just return with it
* still locked.
- *
* - kq locked at entry
* - unlock on exit if we get the use reference
*/
kqlock2knoteuse(struct kqueue *kq, struct knote *kn)
{
if (kn->kn_status & KN_DROPPING)
- return 0;
+ return (0);
kn->kn_inuse++;
kqunlock(kq);
- return 1;
- }
+ return (1);
+}
-/*
- * Convert a kq lock to a knote use referece.
+/*
+ * Convert a kq lock to a knote use referece,
+ * but wait for attach and drop events to complete.
*
* If the knote is being dropped, we can't get
* a use reference, so just return with it
* still locked.
- *
* - kq locked at entry
* - kq always unlocked on exit
*/
static int
kqlock2knoteusewait(struct kqueue *kq, struct knote *kn)
{
- if (!kqlock2knoteuse(kq, kn)) {
- kn->kn_status |= KN_DROPWAIT;
- assert_wait(&kn->kn_status, THREAD_UNINT);
+ if ((kn->kn_status & (KN_DROPPING | KN_ATTACHING)) != 0) {
+ kn->kn_status |= KN_USEWAIT;
+ wait_queue_assert_wait((wait_queue_t)kq->kq_wqs,
+ &kn->kn_status, THREAD_UNINT, 0);
kqunlock(kq);
thread_block(THREAD_CONTINUE_NULL);
- return 0;
+ return (0);
}
- return 1;
- }
+ kn->kn_inuse++;
+ kqunlock(kq);
+ return (1);
+}
-/*
+/*
* Convert from a knote use reference back to kq lock.
*
* Drop a use reference and wake any waiters if
knoteuse2kqlock(struct kqueue *kq, struct knote *kn)
{
kqlock(kq);
- if ((--kn->kn_inuse == 0) &&
- (kn->kn_status & KN_USEWAIT)) {
- kn->kn_status &= ~KN_USEWAIT;
- thread_wakeup(&kn->kn_inuse);
+ if (--kn->kn_inuse == 0) {
+ if ((kn->kn_status & KN_ATTACHING) != 0) {
+ kn->kn_status &= ~KN_ATTACHING;
+ }
+ if ((kn->kn_status & KN_USEWAIT) != 0) {
+ kn->kn_status &= ~KN_USEWAIT;
+ wait_queue_wakeup_all((wait_queue_t)kq->kq_wqs,
+ &kn->kn_status, THREAD_AWAKENED);
+ }
}
return ((kn->kn_status & KN_DROPPING) == 0);
- }
+}
-/*
- * Convert a kq lock to a knote drop referece.
+/*
+ * Convert a kq lock to a knote drop reference.
*
* If the knote is in use, wait for the use count
* to subside. We first mark our intention to drop
* it - keeping other users from "piling on."
* If we are too late, we have to wait for the
* other drop to complete.
- *
+ *
* - kq locked at entry
* - always unlocked on exit.
* - caller can't hold any locks that would prevent
static int
kqlock2knotedrop(struct kqueue *kq, struct knote *kn)
{
+ int oktodrop;
- if ((kn->kn_status & KN_DROPPING) == 0) {
- kn->kn_status |= KN_DROPPING;
- if (kn->kn_inuse > 0) {
- kn->kn_status |= KN_USEWAIT;
- assert_wait(&kn->kn_inuse, THREAD_UNINT);
- kqunlock(kq);
- thread_block(THREAD_CONTINUE_NULL);
- } else
+ oktodrop = ((kn->kn_status & (KN_DROPPING | KN_ATTACHING)) == 0);
+ kn->kn_status &= ~KN_STAYQUEUED;
+ kn->kn_status |= KN_DROPPING;
+ if (oktodrop) {
+ if (kn->kn_inuse == 0) {
kqunlock(kq);
- return 1;
- } else {
- kn->kn_status |= KN_DROPWAIT;
- assert_wait(&kn->kn_status, THREAD_UNINT);
- kqunlock(kq);
- thread_block(THREAD_CONTINUE_NULL);
- return 0;
+ return (oktodrop);
+ }
}
+ kn->kn_status |= KN_USEWAIT;
+ wait_queue_assert_wait((wait_queue_t)kq->kq_wqs, &kn->kn_status,
+ THREAD_UNINT, 0);
+ kqunlock(kq);
+ thread_block(THREAD_CONTINUE_NULL);
+ return (oktodrop);
}
-
-/*
+
+/*
* Release a knote use count reference.
*/
static void
struct kqueue *kq = kn->kn_kq;
kqlock(kq);
- if ((--kn->kn_inuse == 0) &&
- (kn->kn_status & KN_USEWAIT)) {
- kn->kn_status &= ~KN_USEWAIT;
- thread_wakeup(&kn->kn_inuse);
+ if (--kn->kn_inuse == 0) {
+ if ((kn->kn_status & KN_USEWAIT) != 0) {
+ kn->kn_status &= ~KN_USEWAIT;
+ wait_queue_wakeup_all((wait_queue_t)kq->kq_wqs,
+ &kn->kn_status, THREAD_AWAKENED);
+ }
}
kqunlock(kq);
- }
-
-
+}
static int
filt_fileattach(struct knote *kn)
{
-
- return (fo_kqfilter(kn->kn_fp, kn, current_proc()));
+ return (fo_kqfilter(kn->kn_fp, kn, vfs_context_current()));
}
-#define f_flag f_fglob->fg_flag
-#define f_type f_fglob->fg_type
-#define f_msgcount f_fglob->fg_msgcount
-#define f_cred f_fglob->fg_cred
-#define f_ops f_fglob->fg_ops
-#define f_offset f_fglob->fg_offset
-#define f_data f_fglob->fg_data
+#define f_flag f_fglob->fg_flag
+#define f_msgcount f_fglob->fg_msgcount
+#define f_cred f_fglob->fg_cred
+#define f_ops f_fglob->fg_ops
+#define f_offset f_fglob->fg_offset
+#define f_data f_fglob->fg_data
static void
filt_kqdetach(struct knote *kn)
filt_procattach(struct knote *kn)
{
struct proc *p;
- int funnel_state;
-
- funnel_state = thread_funnel_set(kernel_flock, TRUE);
- p = pfind(kn->kn_id);
+ assert(PID_MAX < NOTE_PDATAMASK);
+
+ if ((kn->kn_sfflags & (NOTE_TRACK | NOTE_TRACKERR | NOTE_CHILD)) != 0)
+ return (ENOTSUP);
+
+ p = proc_find(kn->kn_id);
if (p == NULL) {
- thread_funnel_set(kernel_flock, funnel_state);
return (ESRCH);
}
- kn->kn_flags |= EV_CLEAR; /* automatically set */
- kn->kn_hookid = 1; /* mark exit not seen */
+ const int NoteExitStatusBits = NOTE_EXIT | NOTE_EXITSTATUS;
- /*
- * internal flag indicating registration done by kernel
- */
- if (kn->kn_flags & EV_FLAG1) {
- kn->kn_data = (int)kn->kn_sdata; /* ppid */
- kn->kn_fflags = NOTE_CHILD;
- kn->kn_flags &= ~EV_FLAG1;
- }
+ if ((kn->kn_sfflags & NoteExitStatusBits) == NoteExitStatusBits)
+ do {
+ pid_t selfpid = proc_selfpid();
+
+ if (p->p_ppid == selfpid)
+ break; /* parent => ok */
+
+ if ((p->p_lflag & P_LTRACED) != 0 &&
+ (p->p_oppid == selfpid))
+ break; /* parent-in-waiting => ok */
+
+ proc_rele(p);
+ return (EACCES);
+ } while (0);
+
+ proc_klist_lock();
+
+ kn->kn_flags |= EV_CLEAR; /* automatically set */
+ kn->kn_ptr.p_proc = p; /* store the proc handle */
- /* XXX lock the proc here while adding to the list? */
KNOTE_ATTACH(&p->p_klist, kn);
- thread_funnel_set(kernel_flock, funnel_state);
+ proc_klist_unlock();
+
+ proc_rele(p);
return (0);
}
/*
* The knote may be attached to a different process, which may exit,
* leaving nothing for the knote to be attached to. In that case,
- * we wont be able to find the process from its pid. But the exit
- * code may still be processing the knote list for the target process.
- * We may have to wait for that processing to complete before we can
- * return (and presumably free the knote) without actually removing
- * it from the dead process' knote list.
+ * the pointer to the process will have already been nulled out.
*/
static void
filt_procdetach(struct knote *kn)
{
struct proc *p;
- int funnel_state;
- funnel_state = thread_funnel_set(kernel_flock, TRUE);
- p = pfind(kn->kn_id);
+ proc_klist_lock();
- if (p != (struct proc *)NULL) {
+ p = kn->kn_ptr.p_proc;
+ if (p != PROC_NULL) {
+ kn->kn_ptr.p_proc = PROC_NULL;
KNOTE_DETACH(&p->p_klist, kn);
- } else if (kn->kn_hookid != 0) { /* if not NOTE_EXIT yet */
- kn->kn_hookid = -1; /* we are detaching but... */
- assert_wait(&kn->kn_hook, THREAD_UNINT); /* have to wait */
- thread_block(THREAD_CONTINUE_NULL);
}
- thread_funnel_set(kernel_flock, funnel_state);
+
+ proc_klist_unlock();
}
static int
filt_proc(struct knote *kn, long hint)
{
-
+ /*
+ * Note: a lot of bits in hint may be obtained from the knote
+ * To free some of those bits, see <rdar://problem/12592988> Freeing up
+ * bits in hint for filt_proc
+ */
+ /* hint is 0 when called from above */
if (hint != 0) {
u_int event;
- /* must hold the funnel when coming from below */
- assert(thread_funnel_get() != (funnel_t)0);
+ /* ALWAYS CALLED WITH proc_klist_lock when (hint != 0) */
/*
* mask off extra data
*/
event = (u_int)hint & NOTE_PCTRLMASK;
+ /*
+ * termination lifecycle events can happen while a debugger
+ * has reparented a process, in which case notifications
+ * should be quashed except to the tracing parent. When
+ * the debugger reaps the child (either via wait4(2) or
+ * process exit), the child will be reparented to the original
+ * parent and these knotes re-fired.
+ */
+ if (event & NOTE_EXIT) {
+ if ((kn->kn_ptr.p_proc->p_oppid != 0)
+ && (kn->kn_kq->kq_p->p_pid != kn->kn_ptr.p_proc->p_ppid)) {
+ /*
+ * This knote is not for the current ptrace(2) parent, ignore.
+ */
+ return 0;
+ }
+ }
+
/*
* if the user is interested in this event, record it.
*/
if (kn->kn_sfflags & event)
kn->kn_fflags |= event;
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wdeprecated-declarations"
+ if ((event == NOTE_REAP) || ((event == NOTE_EXIT) && !(kn->kn_sfflags & NOTE_REAP))) {
+ kn->kn_flags |= (EV_EOF | EV_ONESHOT);
+ }
+#pragma clang diagnostic pop
+
+
/*
- * process is gone, so flag the event as finished.
- *
- * If someone was trying to detach, but couldn't
- * find the proc to complete the detach, wake them
- * up (nothing will ever need to walk the per-proc
- * knote list again - so its safe for them to dump
- * the knote now).
+ * The kernel has a wrapper in place that returns the same data
+ * as is collected here, in kn_data. Any changes to how
+ * NOTE_EXITSTATUS and NOTE_EXIT_DETAIL are collected
+ * should also be reflected in the proc_pidnoteexit() wrapper.
*/
if (event == NOTE_EXIT) {
- boolean_t detaching = (kn->kn_hookid == -1);
-
- kn->kn_hookid = 0;
- kn->kn_flags |= (EV_EOF | EV_ONESHOT);
- if (detaching)
- thread_wakeup(&kn->kn_hookid);
- return (1);
+ kn->kn_data = 0;
+ if ((kn->kn_sfflags & NOTE_EXITSTATUS) != 0) {
+ kn->kn_fflags |= NOTE_EXITSTATUS;
+ kn->kn_data |= (hint & NOTE_PDATAMASK);
+ }
+ if ((kn->kn_sfflags & NOTE_EXIT_DETAIL) != 0) {
+ kn->kn_fflags |= NOTE_EXIT_DETAIL;
+ if ((kn->kn_ptr.p_proc->p_lflag &
+ P_LTERM_DECRYPTFAIL) != 0) {
+ kn->kn_data |= NOTE_EXIT_DECRYPTFAIL;
+ }
+ if ((kn->kn_ptr.p_proc->p_lflag &
+ P_LTERM_JETSAM) != 0) {
+ kn->kn_data |= NOTE_EXIT_MEMORY;
+ switch (kn->kn_ptr.p_proc->p_lflag &
+ P_JETSAM_MASK) {
+ case P_JETSAM_VMPAGESHORTAGE:
+ kn->kn_data |= NOTE_EXIT_MEMORY_VMPAGESHORTAGE;
+ break;
+ case P_JETSAM_VMTHRASHING:
+ kn->kn_data |= NOTE_EXIT_MEMORY_VMTHRASHING;
+ break;
+ case P_JETSAM_FCTHRASHING:
+ kn->kn_data |= NOTE_EXIT_MEMORY_FCTHRASHING;
+ break;
+ case P_JETSAM_VNODE:
+ kn->kn_data |= NOTE_EXIT_MEMORY_VNODE;
+ break;
+ case P_JETSAM_HIWAT:
+ kn->kn_data |= NOTE_EXIT_MEMORY_HIWAT;
+ break;
+ case P_JETSAM_PID:
+ kn->kn_data |= NOTE_EXIT_MEMORY_PID;
+ break;
+ case P_JETSAM_IDLEEXIT:
+ kn->kn_data |= NOTE_EXIT_MEMORY_IDLE;
+ break;
+ }
+ }
+ if ((kn->kn_ptr.p_proc->p_csflags &
+ CS_KILLED) != 0) {
+ kn->kn_data |= NOTE_EXIT_CSERROR;
+ }
+ }
}
+ }
- /*
- * process forked, and user wants to track the new process,
- * so attach a new knote to it, and immediately report an
- * event with the parent's pid.
- */
- if ((event == NOTE_FORK) && (kn->kn_sfflags & NOTE_TRACK)) {
- struct kevent kev;
- int error;
+ /* atomic check, no locking need when called from above */
+ return (kn->kn_fflags != 0);
+}
- /*
- * register knote with new process.
- */
- kev.ident = hint & NOTE_PDATAMASK; /* pid */
- kev.filter = kn->kn_filter;
- kev.flags = kn->kn_flags | EV_ADD | EV_ENABLE | EV_FLAG1;
- kev.fflags = kn->kn_sfflags;
- kev.data = kn->kn_id; /* parent */
- kev.udata = kn->kn_kevent.udata; /* preserve udata */
- error = kevent_register(kn->kn_kq, &kev, NULL);
- if (error)
- kn->kn_fflags |= NOTE_TRACKERR;
+#if VM_PRESSURE_EVENTS
+/*
+ * Virtual memory kevents
+ *
+ * author: Matt Jacobson [matthew_jacobson@apple.com]
+ */
+
+static int
+filt_vmattach(struct knote *kn)
+{
+ /*
+ * The note will be cleared once the information has been flushed to
+ * the client. If there is still pressure, we will be re-alerted.
+ */
+ kn->kn_flags |= EV_CLEAR;
+ return (vm_knote_register(kn));
+}
+
+static void
+filt_vmdetach(struct knote *kn)
+{
+ vm_knote_unregister(kn);
+}
+
+static int
+filt_vm(struct knote *kn, long hint)
+{
+ /* hint == 0 means this is just an alive? check (always true) */
+ if (hint != 0) {
+ const pid_t pid = (pid_t)hint;
+ if ((kn->kn_sfflags & NOTE_VM_PRESSURE) &&
+ (kn->kn_kq->kq_p->p_pid == pid)) {
+ kn->kn_fflags |= NOTE_VM_PRESSURE;
}
}
- return (kn->kn_fflags != 0); /* atomic check - no funnel needed from above */
+ return (kn->kn_fflags != 0);
}
+#endif /* VM_PRESSURE_EVENTS */
/*
- * filt_timercompute - compute absolute timeout
+ * filt_timervalidate - process data from user
+ *
+ * Converts to either interval or deadline format.
*
* The saved-data field in the knote contains the
* time value. The saved filter-flags indicates
* the unit of measurement.
*
- * If the timeout is not absolute, adjust it for
- * the current time.
+ * After validation, either the saved-data field
+ * contains the interval in absolute time, or ext[0]
+ * contains the expected deadline. If that deadline
+ * is in the past, ext[0] is 0.
+ *
+ * Returns EINVAL for unrecognized units of time.
+ *
+ * Timer filter lock is held.
+ *
*/
static int
-filt_timercompute(struct knote *kn, uint64_t *abs_time)
+filt_timervalidate(struct knote *kn)
{
uint64_t multiplier;
- uint64_t raw;
+ uint64_t raw = 0;
switch (kn->kn_sfflags & (NOTE_SECONDS|NOTE_USECONDS|NOTE_NSECONDS)) {
case NOTE_SECONDS:
multiplier = NSEC_PER_SEC / 1000;
break;
default:
- return EINVAL;
+ return (EINVAL);
}
- nanoseconds_to_absolutetime((uint64_t)kn->kn_sdata * multiplier, &raw);
- if (raw <= filt_timerfloor) {
- *abs_time = 0;
- return 0;
+
+ /* transform the slop delta(leeway) in kn_ext[1] if passed to same time scale */
+ if(kn->kn_sfflags & NOTE_LEEWAY){
+ nanoseconds_to_absolutetime((uint64_t)kn->kn_ext[1] * multiplier, &raw);
+ kn->kn_ext[1] = raw;
}
- if ((kn->kn_sfflags & NOTE_ABSOLUTE) == NOTE_ABSOLUTE) {
- uint32_t seconds, nanoseconds;
+
+ nanoseconds_to_absolutetime((uint64_t)kn->kn_sdata * multiplier, &raw);
+
+ kn->kn_ext[0] = 0;
+ kn->kn_sdata = 0;
+
+ if (kn->kn_sfflags & NOTE_ABSOLUTE) {
+ clock_sec_t seconds;
+ clock_nsec_t nanoseconds;
uint64_t now;
clock_get_calendar_nanotime(&seconds, &nanoseconds);
- nanoseconds_to_absolutetime((uint64_t)seconds * NSEC_PER_SEC + nanoseconds,
- &now);
- if (now >= raw + filt_timerfloor) {
- *abs_time = 0;
- return 0;
+ nanoseconds_to_absolutetime((uint64_t)seconds * NSEC_PER_SEC +
+ nanoseconds, &now);
+
+ if (raw < now) {
+ /* time has already passed */
+ kn->kn_ext[0] = 0;
+ } else {
+ raw -= now;
+ clock_absolutetime_interval_to_deadline(raw,
+ &kn->kn_ext[0]);
}
- raw -= now;
- }
- clock_absolutetime_interval_to_deadline(raw, abs_time);
- return 0;
+ } else {
+ kn->kn_sdata = raw;
+ }
+
+ return (0);
+}
+
+/*
+ * filt_timerupdate - compute the next deadline
+ *
+ * Repeating timers store their interval in kn_sdata. Absolute
+ * timers have already calculated the deadline, stored in ext[0].
+ *
+ * On return, the next deadline (or zero if no deadline is needed)
+ * is stored in kn_ext[0].
+ *
+ * Timer filter lock is held.
+ */
+static void
+filt_timerupdate(struct knote *kn)
+{
+ /* if there's no interval, deadline is just in kn_ext[0] */
+ if (kn->kn_sdata == 0)
+ return;
+
+ /* if timer hasn't fired before, fire in interval nsecs */
+ if (kn->kn_ext[0] == 0) {
+ clock_absolutetime_interval_to_deadline(kn->kn_sdata,
+ &kn->kn_ext[0]);
+ } else {
+ /*
+ * If timer has fired before, schedule the next pop
+ * relative to the last intended deadline.
+ *
+ * We could check for whether the deadline has expired,
+ * but the thread call layer can handle that.
+ */
+ kn->kn_ext[0] += kn->kn_sdata;
+ }
}
-/*
+/*
* filt_timerexpire - the timer callout routine
*
- * Just propagate the timer event into the knote
- * filter routine (by going through the knote
- * synchronization point). Pass a hint to
- * indicate this is a real event, not just a
- * query from above.
+ * Just propagate the timer event into the knote
+ * filter routine (by going through the knote
+ * synchronization point). Pass a hint to
+ * indicate this is a real event, not just a
+ * query from above.
*/
static void
filt_timerexpire(void *knx, __unused void *spare)
struct klist timer_list;
struct knote *kn = knx;
+ filt_timerlock();
+
+ kn->kn_hookid &= ~TIMER_RUNNING;
+
/* no "object" for timers, so fake a list */
SLIST_INIT(&timer_list);
- SLIST_INSERT_HEAD(&timer_list, kn, kn_selnext);
+ SLIST_INSERT_HEAD(&timer_list, kn, kn_selnext);
KNOTE(&timer_list, 1);
+
+ /* if someone is waiting for timer to pop */
+ if (kn->kn_hookid & TIMER_CANCELWAIT) {
+ struct kqueue *kq = kn->kn_kq;
+ wait_queue_wakeup_all((wait_queue_t)kq->kq_wqs, &kn->kn_hook,
+ THREAD_AWAKENED);
+ }
+
+ filt_timerunlock();
+}
+
+/*
+ * Cancel a running timer (or wait for the pop).
+ * Timer filter lock is held.
+ */
+static void
+filt_timercancel(struct knote *kn)
+{
+ struct kqueue *kq = kn->kn_kq;
+ thread_call_t callout = kn->kn_hook;
+ boolean_t cancelled;
+
+ if (kn->kn_hookid & TIMER_RUNNING) {
+ /* cancel the callout if we can */
+ cancelled = thread_call_cancel(callout);
+ if (cancelled) {
+ kn->kn_hookid &= ~TIMER_RUNNING;
+ } else {
+ /* we have to wait for the expire routine. */
+ kn->kn_hookid |= TIMER_CANCELWAIT;
+ wait_queue_assert_wait((wait_queue_t)kq->kq_wqs,
+ &kn->kn_hook, THREAD_UNINT, 0);
+ filt_timerunlock();
+ thread_block(THREAD_CONTINUE_NULL);
+ filt_timerlock();
+ assert((kn->kn_hookid & TIMER_RUNNING) == 0);
+ }
+ }
}
/*
- * data contains amount of time to sleep, in milliseconds,
- * or a pointer to a timespec structure.
- */
+ * Allocate a thread call for the knote's lifetime, and kick off the timer.
+ */
static int
filt_timerattach(struct knote *kn)
{
thread_call_t callout;
- uint64_t deadline;
int error;
- error = filt_timercompute(kn, &deadline);
- if (error)
- return (error);
+ callout = thread_call_allocate(filt_timerexpire, kn);
+ if (NULL == callout)
+ return (ENOMEM);
- if (deadline) {
- callout = thread_call_allocate(filt_timerexpire, kn);
- if (NULL == callout)
- return (ENOMEM);
- } else {
- /* handle as immediate */
- kn->kn_sdata = 0;
- callout = NULL;
+ filt_timerlock();
+ error = filt_timervalidate(kn);
+ if (error != 0) {
+ filt_timerunlock();
+ return (error);
}
- filt_timerlock();
- kn->kn_hook = (caddr_t)callout;
+ kn->kn_hook = (void*)callout;
+ kn->kn_hookid = 0;
/* absolute=EV_ONESHOT */
if (kn->kn_sfflags & NOTE_ABSOLUTE)
- kn->kn_flags |= EV_ONESHOT;
+ kn->kn_flags |= EV_ONESHOT;
- if (deadline) {
- /* all others - if not faking immediate */
+ filt_timerupdate(kn);
+ if (kn->kn_ext[0]) {
kn->kn_flags |= EV_CLEAR;
- thread_call_enter_delayed(callout, deadline);
- kn->kn_hookid = 0;
+ unsigned int timer_flags = 0;
+ if (kn->kn_sfflags & NOTE_CRITICAL)
+ timer_flags |= THREAD_CALL_DELAY_USER_CRITICAL;
+ else if (kn->kn_sfflags & NOTE_BACKGROUND)
+ timer_flags |= THREAD_CALL_DELAY_USER_BACKGROUND;
+ else
+ timer_flags |= THREAD_CALL_DELAY_USER_NORMAL;
+
+ if (kn->kn_sfflags & NOTE_LEEWAY)
+ timer_flags |= THREAD_CALL_DELAY_LEEWAY;
+
+ thread_call_enter_delayed_with_leeway(callout, NULL,
+ kn->kn_ext[0], kn->kn_ext[1], timer_flags);
+
+ kn->kn_hookid |= TIMER_RUNNING;
} else {
/* fake immediate */
- kn->kn_hookid = 1;
+ kn->kn_data = 1;
}
+
filt_timerunlock();
return (0);
}
+/*
+ * Shut down the timer if it's running, and free the callout.
+ */
static void
filt_timerdetach(struct knote *kn)
{
thread_call_t callout;
filt_timerlock();
+
callout = (thread_call_t)kn->kn_hook;
- if (callout != NULL) {
- boolean_t cancelled;
+ filt_timercancel(kn);
- /* cancel the callout if we can */
- cancelled = thread_call_cancel(callout);
- if (cancelled) {
- /* got it, just free it */
- kn->kn_hook = NULL;
- filt_timerunlock();
- thread_call_free(callout);
- return;
- }
- /* we have to wait for the expire routine. */
- kn->kn_hookid = -1; /* we are detaching */
- assert_wait(&kn->kn_hook, THREAD_UNINT);
- filt_timerunlock();
- thread_block(THREAD_CONTINUE_NULL);
- assert(kn->kn_hook == NULL);
- return;
- }
- /* nothing to do */
- filt_timerunlock();
+ filt_timerunlock();
+
+ thread_call_free(callout);
}
static int
-filt_timer(struct knote *kn, __unused long hint)
+filt_timer(struct knote *kn, long hint)
{
int result;
-
- if (hint) {
- /* real timer pop */
- thread_call_t callout;
- boolean_t detaching;
- filt_timerlock();
-
+ if (hint) {
+ /* real timer pop -- timer lock held by filt_timerexpire */
kn->kn_data++;
- detaching = (kn->kn_hookid < 0);
- callout = (thread_call_t)kn->kn_hook;
+ if (((kn->kn_hookid & TIMER_CANCELWAIT) == 0) &&
+ ((kn->kn_flags & EV_ONESHOT) == 0)) {
- if (!detaching && (kn->kn_flags & EV_ONESHOT) == 0) {
- uint64_t deadline;
- int error;
+ /* evaluate next time to fire */
+ filt_timerupdate(kn);
+
+ if (kn->kn_ext[0]) {
+ unsigned int timer_flags = 0;
- /* user input data may have changed - deal */
- error = filt_timercompute(kn, &deadline);
- if (error) {
- kn->kn_flags |= EV_ERROR;
- kn->kn_data = error;
- } else if (deadline == 0) {
- /* revert to fake immediate */
- kn->kn_flags &= ~EV_CLEAR;
- kn->kn_sdata = 0;
- kn->kn_hookid = 1;
- } else {
/* keep the callout and re-arm */
- thread_call_enter_delayed(callout, deadline);
- filt_timerunlock();
- return 1;
+ if (kn->kn_sfflags & NOTE_CRITICAL)
+ timer_flags |= THREAD_CALL_DELAY_USER_CRITICAL;
+ else if (kn->kn_sfflags & NOTE_BACKGROUND)
+ timer_flags |= THREAD_CALL_DELAY_USER_BACKGROUND;
+ else
+ timer_flags |= THREAD_CALL_DELAY_USER_NORMAL;
+
+ if (kn->kn_sfflags & NOTE_LEEWAY)
+ timer_flags |= THREAD_CALL_DELAY_LEEWAY;
+
+ thread_call_enter_delayed_with_leeway(kn->kn_hook, NULL,
+ kn->kn_ext[0], kn->kn_ext[1], timer_flags);
+
+ kn->kn_hookid |= TIMER_RUNNING;
}
}
- kn->kn_hook = NULL;
- filt_timerunlock();
- thread_call_free(callout);
- /* if someone is waiting for timer to pop */
- if (detaching)
- thread_wakeup(&kn->kn_hook);
-
- return 1;
- }
+ return (1);
+ }
/* user-query */
filt_timerlock();
- /* change fake timer to real if needed */
- while (kn->kn_hookid > 0 && kn->kn_sdata > 0) {
- int error;
+ result = (kn->kn_data != 0);
- /* update the fake timer (make real) */
- kn->kn_hookid = 0;
- kn->kn_data = 0;
- filt_timerunlock();
- error = filt_timerattach(kn);
- filt_timerlock();
+ filt_timerunlock();
+
+ return (result);
+}
+
+
+/*
+ * filt_timertouch - update knote with new user input
+ *
+ * Cancel and restart the timer based on new user data. When
+ * the user picks up a knote, clear the count of how many timer
+ * pops have gone off (in kn_data).
+ */
+static void
+filt_timertouch(struct knote *kn, struct kevent64_s *kev, long type)
+{
+ int error;
+ filt_timerlock();
+
+ switch (type) {
+ case EVENT_REGISTER:
+ /* cancel current call */
+ filt_timercancel(kn);
+
+ /* recalculate deadline */
+ kn->kn_sdata = kev->data;
+ kn->kn_sfflags = kev->fflags;
+ kn->kn_ext[0] = kev->ext[0];
+ kn->kn_ext[1] = kev->ext[1];
+
+ error = filt_timervalidate(kn);
if (error) {
+ /* no way to report error, so mark it in the knote */
kn->kn_flags |= EV_ERROR;
kn->kn_data = error;
- filt_timerunlock();
- return 1;
+ break;
}
- }
- /* if still fake, pretend it fired */
- if (kn->kn_hookid > 0)
- kn->kn_data = 1;
+ /* start timer if necessary */
+ filt_timerupdate(kn);
+
+ if (kn->kn_ext[0]) {
+ unsigned int timer_flags = 0;
+ if (kn->kn_sfflags & NOTE_CRITICAL)
+ timer_flags |= THREAD_CALL_DELAY_USER_CRITICAL;
+ else if (kn->kn_sfflags & NOTE_BACKGROUND)
+ timer_flags |= THREAD_CALL_DELAY_USER_BACKGROUND;
+ else
+ timer_flags |= THREAD_CALL_DELAY_USER_NORMAL;
+
+ if (kn->kn_sfflags & NOTE_LEEWAY)
+ timer_flags |= THREAD_CALL_DELAY_LEEWAY;
+
+ thread_call_enter_delayed_with_leeway(kn->kn_hook, NULL,
+ kn->kn_ext[0], kn->kn_ext[1], timer_flags);
+
+ kn->kn_hookid |= TIMER_RUNNING;
+ } else {
+ /* pretend the timer has fired */
+ kn->kn_data = 1;
+ }
+
+ break;
+
+ case EVENT_PROCESS:
+ /* reset the timer pop count in kn_data */
+ *kev = kn->kn_kevent;
+ kev->ext[0] = 0;
+ kn->kn_data = 0;
+ if (kn->kn_flags & EV_CLEAR)
+ kn->kn_fflags = 0;
+ break;
+ default:
+ panic("%s: - invalid type (%ld)", __func__, type);
+ break;
+ }
- result = (kn->kn_data != 0);
filt_timerunlock();
- return result;
}
static void
lck_mtx_unlock(&_filt_timerlock);
}
-/*
- * JMM - placeholder for not-yet-implemented filters
- */
static int
-filt_badattach(__unused struct knote *kn)
+filt_userattach(struct knote *kn)
{
- return(ENOTSUP);
-}
-
+ /* EVFILT_USER knotes are not attached to anything in the kernel */
+ kn->kn_hook = NULL;
+ if (kn->kn_fflags & NOTE_TRIGGER) {
+ kn->kn_hookid = 1;
+ } else {
+ kn->kn_hookid = 0;
+ }
+ return (0);
+}
+
+static void
+filt_userdetach(__unused struct knote *kn)
+{
+ /* EVFILT_USER knotes are not attached to anything in the kernel */
+}
+
+static int
+filt_user(struct knote *kn, __unused long hint)
+{
+ return (kn->kn_hookid);
+}
+
+static void
+filt_usertouch(struct knote *kn, struct kevent64_s *kev, long type)
+{
+ uint32_t ffctrl;
+ switch (type) {
+ case EVENT_REGISTER:
+ if (kev->fflags & NOTE_TRIGGER) {
+ kn->kn_hookid = 1;
+ }
+
+ ffctrl = kev->fflags & NOTE_FFCTRLMASK;
+ kev->fflags &= NOTE_FFLAGSMASK;
+ switch (ffctrl) {
+ case NOTE_FFNOP:
+ break;
+ case NOTE_FFAND:
+ OSBitAndAtomic(kev->fflags, &kn->kn_sfflags);
+ break;
+ case NOTE_FFOR:
+ OSBitOrAtomic(kev->fflags, &kn->kn_sfflags);
+ break;
+ case NOTE_FFCOPY:
+ kn->kn_sfflags = kev->fflags;
+ break;
+ }
+ kn->kn_sdata = kev->data;
+ break;
+ case EVENT_PROCESS:
+ *kev = kn->kn_kevent;
+ kev->fflags = (volatile UInt32)kn->kn_sfflags;
+ kev->data = kn->kn_sdata;
+ if (kn->kn_flags & EV_CLEAR) {
+ kn->kn_hookid = 0;
+ kn->kn_data = 0;
+ kn->kn_fflags = 0;
+ }
+ break;
+ default:
+ panic("%s: - invalid type (%ld)", __func__, type);
+ break;
+ }
+}
+
+/*
+ * JMM - placeholder for not-yet-implemented filters
+ */
+static int
+filt_badattach(__unused struct knote *kn)
+{
+ return (ENOTSUP);
+}
struct kqueue *
kqueue_alloc(struct proc *p)
struct filedesc *fdp = p->p_fd;
struct kqueue *kq;
- MALLOC_ZONE(kq, struct kqueue *, sizeof(struct kqueue), M_KQUEUE, M_WAITOK);
+ MALLOC_ZONE(kq, struct kqueue *, sizeof (struct kqueue), M_KQUEUE,
+ M_WAITOK);
if (kq != NULL) {
- bzero(kq, sizeof(struct kqueue));
- lck_spin_init(&kq->kq_lock, kq_lck_grp, kq_lck_attr);
- TAILQ_INIT(&kq->kq_head);
- TAILQ_INIT(&kq->kq_inprocess);
- kq->kq_fdp = fdp;
+ wait_queue_set_t wqs;
+
+ wqs = wait_queue_set_alloc(SYNC_POLICY_FIFO |
+ SYNC_POLICY_PREPOST);
+ if (wqs != NULL) {
+ bzero(kq, sizeof (struct kqueue));
+ lck_spin_init(&kq->kq_lock, kq_lck_grp, kq_lck_attr);
+ TAILQ_INIT(&kq->kq_head);
+ kq->kq_wqs = wqs;
+ kq->kq_p = p;
+ } else {
+ FREE_ZONE(kq, sizeof (struct kqueue), M_KQUEUE);
+ kq = NULL;
+ }
}
if (fdp->fd_knlistsize < 0) {
proc_fdlock(p);
if (fdp->fd_knlistsize < 0)
- fdp->fd_knlistsize = 0; /* this process has had a kq */
+ fdp->fd_knlistsize = 0; /* this process has had a kq */
proc_fdunlock(p);
}
- return kq;
+ return (kq);
}
-
/*
* kqueue_dealloc - detach all knotes from a kqueue and free it
*
* Nothing locked on entry or exit.
*/
void
-kqueue_dealloc(struct kqueue *kq, struct proc *p)
+kqueue_dealloc(struct kqueue *kq)
{
+ struct proc *p = kq->kq_p;
struct filedesc *fdp = p->p_fd;
struct knote *kn;
int i;
}
}
proc_fdunlock(p);
+
+ /*
+ * before freeing the wait queue set for this kqueue,
+ * make sure it is unlinked from all its containing (select) sets.
+ */
+ wait_queue_unlink_all((wait_queue_t)kq->kq_wqs);
+ wait_queue_set_free(kq->kq_wqs);
lck_spin_destroy(&kq->kq_lock, kq_lck_grp);
- FREE_ZONE(kq, sizeof(struct kqueue), M_KQUEUE);
+ FREE_ZONE(kq, sizeof (struct kqueue), M_KQUEUE);
}
int
-kqueue(struct proc *p, __unused struct kqueue_args *uap, register_t *retval)
+kqueue_body(struct proc *p, fp_allocfn_t fp_zalloc, void *cra, int32_t *retval)
{
struct kqueue *kq;
struct fileproc *fp;
int fd, error;
- error = falloc(p, &fp, &fd);
+ error = falloc_withalloc(p,
+ &fp, &fd, vfs_context_current(), fp_zalloc, cra);
if (error) {
return (error);
}
}
fp->f_flag = FREAD | FWRITE;
- fp->f_type = DTYPE_KQUEUE;
fp->f_ops = &kqueueops;
- fp->f_data = (caddr_t)kq;
+ fp->f_data = kq;
proc_fdlock(p);
- *fdflags(p, fd) &= ~UF_RESERVED;
+ *fdflags(p, fd) |= UF_EXCLOSE;
+ procfdtbl_releasefd(p, fd, NULL);
fp_drop(p, fd, fp, 1);
proc_fdunlock(p);
}
int
-kqueue_portset_np(__unused struct proc *p,
- __unused struct kqueue_portset_np_args *uap,
- __unused register_t *retval)
-{
- /* JMM - Placeholder for now */
- return (ENOTSUP);
-}
-
-int
-kqueue_from_portset_np(__unused struct proc *p,
- __unused struct kqueue_from_portset_np_args *uap,
- __unused register_t *retval)
+kqueue(struct proc *p, __unused struct kqueue_args *uap, int32_t *retval)
{
- /* JMM - Placeholder for now */
- return (ENOTSUP);
+ return (kqueue_body(p, fileproc_alloc_init, NULL, retval));
}
static int
-kevent_copyin(user_addr_t *addrp, struct kevent *kevp, struct proc *p)
+kevent_copyin(user_addr_t *addrp, struct kevent64_s *kevp, struct proc *p,
+ int iskev64)
{
int advance;
int error;
- if (IS_64BIT_PROCESS(p)) {
- struct user_kevent kev64;
+ if (iskev64) {
+ advance = sizeof (struct kevent64_s);
+ error = copyin(*addrp, (caddr_t)kevp, advance);
+ } else if (IS_64BIT_PROCESS(p)) {
+ struct user64_kevent kev64;
+ bzero(kevp, sizeof (struct kevent64_s));
- advance = sizeof(kev64);
+ advance = sizeof (kev64);
error = copyin(*addrp, (caddr_t)&kev64, advance);
if (error)
- return error;
- kevp->ident = CAST_DOWN(uintptr_t, kev64.ident);
+ return (error);
+ kevp->ident = kev64.ident;
kevp->filter = kev64.filter;
kevp->flags = kev64.flags;
kevp->fflags = kev64.fflags;
- kevp->data = CAST_DOWN(intptr_t, kev64.data);
+ kevp->data = kev64.data;
kevp->udata = kev64.udata;
} else {
- /*
- * compensate for legacy in-kernel kevent layout
- * where the udata field is alredy 64-bit.
- */
- advance = sizeof(*kevp) + sizeof(void *) - sizeof(user_addr_t);
- error = copyin(*addrp, (caddr_t)kevp, advance);
+ struct user32_kevent kev32;
+ bzero(kevp, sizeof (struct kevent64_s));
+
+ advance = sizeof (kev32);
+ error = copyin(*addrp, (caddr_t)&kev32, advance);
+ if (error)
+ return (error);
+ kevp->ident = (uintptr_t)kev32.ident;
+ kevp->filter = kev32.filter;
+ kevp->flags = kev32.flags;
+ kevp->fflags = kev32.fflags;
+ kevp->data = (intptr_t)kev32.data;
+ kevp->udata = CAST_USER_ADDR_T(kev32.udata);
}
if (!error)
*addrp += advance;
- return error;
+ return (error);
}
static int
-kevent_copyout(struct kevent *kevp, user_addr_t *addrp, struct proc *p)
+kevent_copyout(struct kevent64_s *kevp, user_addr_t *addrp, struct proc *p,
+ int iskev64)
{
int advance;
int error;
- if (IS_64BIT_PROCESS(p)) {
- struct user_kevent kev64;
+ if (iskev64) {
+ advance = sizeof (struct kevent64_s);
+ error = copyout((caddr_t)kevp, *addrp, advance);
+ } else if (IS_64BIT_PROCESS(p)) {
+ struct user64_kevent kev64;
+
+ /*
+ * deal with the special case of a user-supplied
+ * value of (uintptr_t)-1.
+ */
+ kev64.ident = (kevp->ident == (uintptr_t)-1) ?
+ (uint64_t)-1LL : (uint64_t)kevp->ident;
- kev64.ident = (uint64_t) kevp->ident;
kev64.filter = kevp->filter;
kev64.flags = kevp->flags;
kev64.fflags = kevp->fflags;
kev64.data = (int64_t) kevp->data;
kev64.udata = kevp->udata;
- advance = sizeof(kev64);
+ advance = sizeof (kev64);
error = copyout((caddr_t)&kev64, *addrp, advance);
} else {
- /*
- * compensate for legacy in-kernel kevent layout
- * where the udata field is alredy 64-bit.
- */
- advance = sizeof(*kevp) + sizeof(void *) - sizeof(user_addr_t);
- error = copyout((caddr_t)kevp, *addrp, advance);
+ struct user32_kevent kev32;
+
+ kev32.ident = (uint32_t)kevp->ident;
+ kev32.filter = kevp->filter;
+ kev32.flags = kevp->flags;
+ kev32.fflags = kevp->fflags;
+ kev32.data = (int32_t)kevp->data;
+ kev32.udata = kevp->udata;
+ advance = sizeof (kev32);
+ error = copyout((caddr_t)&kev32, *addrp, advance);
}
if (!error)
*addrp += advance;
- return error;
+ return (error);
}
/*
{
struct _kevent *cont_args;
struct fileproc *fp;
- register_t *retval;
+ int32_t *retval;
int noutputs;
int fd;
struct proc *p = current_proc();
* kevent - [syscall] register and wait for kernel events
*
*/
+int
+kevent(struct proc *p, struct kevent_args *uap, int32_t *retval)
+{
+ return (kevent_internal(p,
+ 0,
+ uap->changelist,
+ uap->nchanges,
+ uap->eventlist,
+ uap->nevents,
+ uap->fd,
+ uap->timeout,
+ 0, /* no flags from old kevent() call */
+ retval));
+}
int
-kevent(struct proc *p, struct kevent_args *uap, register_t *retval)
-{
- user_addr_t changelist = uap->changelist;
- user_addr_t ueventlist = uap->eventlist;
- int nchanges = uap->nchanges;
- int nevents = uap->nevents;
- int fd = uap->fd;
+kevent64(struct proc *p, struct kevent64_args *uap, int32_t *retval)
+{
+ return (kevent_internal(p,
+ 1,
+ uap->changelist,
+ uap->nchanges,
+ uap->eventlist,
+ uap->nevents,
+ uap->fd,
+ uap->timeout,
+ uap->flags,
+ retval));
+}
+static int
+kevent_internal(struct proc *p, int iskev64, user_addr_t changelist,
+ int nchanges, user_addr_t ueventlist, int nevents, int fd,
+ user_addr_t utimeout, __unused unsigned int flags,
+ int32_t *retval)
+{
struct _kevent *cont_args;
uthread_t ut;
struct kqueue *kq;
struct fileproc *fp;
- struct kevent kev;
+ struct kevent64_s kev;
int error, noutputs;
struct timeval atv;
/* convert timeout to absolute - if we have one */
- if (uap->timeout != USER_ADDR_NULL) {
+ if (utimeout != USER_ADDR_NULL) {
struct timeval rtv;
- if ( IS_64BIT_PROCESS(p) ) {
- struct user_timespec ts;
- error = copyin( uap->timeout, &ts, sizeof(ts) );
+ if (IS_64BIT_PROCESS(p)) {
+ struct user64_timespec ts;
+ error = copyin(utimeout, &ts, sizeof(ts));
if ((ts.tv_sec & 0xFFFFFFFF00000000ull) != 0)
error = EINVAL;
else
TIMESPEC_TO_TIMEVAL(&rtv, &ts);
} else {
- struct timespec ts;
- error = copyin( uap->timeout, &ts, sizeof(ts) );
+ struct user32_timespec ts;
+ error = copyin(utimeout, &ts, sizeof(ts));
TIMESPEC_TO_TIMEVAL(&rtv, &ts);
}
if (error)
- return error;
+ return (error);
if (itimerfix(&rtv))
- return EINVAL;
+ return (EINVAL);
getmicrouptime(&atv);
timevaladd(&atv, &rtv);
} else {
/* get a usecount for the kq itself */
if ((error = fp_getfkq(p, fd, &fp, &kq)) != 0)
- return(error);
+ return (error);
+
+ /* each kq should only be used for events of one type */
+ kqlock(kq);
+ if (kq->kq_state & (KQ_KEV32 | KQ_KEV64)) {
+ if (((iskev64 && (kq->kq_state & KQ_KEV32)) ||
+ (!iskev64 && (kq->kq_state & KQ_KEV64)))) {
+ error = EINVAL;
+ kqunlock(kq);
+ goto errorout;
+ }
+ } else {
+ kq->kq_state |= (iskev64 ? KQ_KEV64 : KQ_KEV32);
+ }
+ kqunlock(kq);
/* register all the change requests the user provided... */
noutputs = 0;
while (nchanges > 0 && error == 0) {
- error = kevent_copyin(&changelist, &kev, p);
+ error = kevent_copyin(&changelist, &kev, p, iskev64);
if (error)
break;
-
+
kev.flags &= ~EV_SYSFLAGS;
error = kevent_register(kq, &kev, p);
- if (error && nevents > 0) {
+ if ((error || (kev.flags & EV_RECEIPT)) && nevents > 0) {
kev.flags = EV_ERROR;
kev.data = error;
- error = kevent_copyout(&kev, &ueventlist, p);
+ error = kevent_copyout(&kev, &ueventlist, p, iskev64);
if (error == 0) {
nevents--;
noutputs++;
/* store the continuation/completion data in the uthread */
ut = (uthread_t)get_bsdthread_info(current_thread());
- cont_args = (struct _kevent *)&ut->uu_state.ss_kevent;
+ cont_args = &ut->uu_kevent.ss_kevent;
cont_args->fp = fp;
cont_args->fd = fd;
cont_args->retval = retval;
cont_args->eventlist = ueventlist;
cont_args->eventcount = nevents;
cont_args->eventout = noutputs;
+ cont_args->eventsize = iskev64;
if (nevents > 0 && noutputs == 0 && error == 0)
- error = kevent_scan(kq, kevent_callback,
- kevent_continue, cont_args,
- &atv, p);
+ error = kqueue_scan(kq, kevent_callback,
+ kevent_continue, cont_args,
+ &atv, p);
kevent_continue(kq, cont_args, error);
- /* NOTREACHED */
- return error;
+
+errorout:
+ fp_drop(p, fd, fp, 0);
+ return (error);
}
/*
* kevent_callback - callback for each individual event
*
- * called with nothing locked
- * caller holds a reference on the kqueue
+ * called with nothing locked
+ * caller holds a reference on the kqueue
*/
-
static int
-kevent_callback(__unused struct kqueue *kq, struct kevent *kevp, void *data)
+kevent_callback(__unused struct kqueue *kq, struct kevent64_s *kevp,
+ void *data)
{
struct _kevent *cont_args;
int error;
+ int iskev64;
cont_args = (struct _kevent *)data;
- assert(cont_args->eventout < cont_arg->eventcount);
+ assert(cont_args->eventout < cont_args->eventcount);
+
+ iskev64 = cont_args->eventsize;
/*
* Copy out the appropriate amount of event data for this user.
*/
- error = kevent_copyout(kevp, &cont_args->eventlist, current_proc());
+ error = kevent_copyout(kevp, &cont_args->eventlist, current_proc(),
+ iskev64);
/*
* If there isn't space for additional events, return
* a harmless error to stop the processing here
*/
if (error == 0 && ++cont_args->eventout == cont_args->eventcount)
- error = EWOULDBLOCK;
- return error;
+ error = EWOULDBLOCK;
+ return (error);
+}
+
+/*
+ * kevent_description - format a description of a kevent for diagnostic output
+ *
+ * called with a 128-byte string buffer
+ */
+
+char *
+kevent_description(struct kevent64_s *kevp, char *s, size_t n)
+{
+ snprintf(s, n,
+ "kevent="
+ "{.ident=%#llx, .filter=%d, .flags=%#x, .fflags=%#x, .data=%#llx, .udata=%#llx, .ext[0]=%#llx, .ext[1]=%#llx}",
+ kevp->ident,
+ kevp->filter,
+ kevp->flags,
+ kevp->fflags,
+ kevp->data,
+ kevp->udata,
+ kevp->ext[0],
+ kevp->ext[1]);
+
+ return (s);
}
/*
*/
int
-kevent_register(struct kqueue *kq, struct kevent *kev, struct proc *p)
+kevent_register(struct kqueue *kq, struct kevent64_s *kev,
+ __unused struct proc *ctxp)
{
- struct filedesc *fdp = kq->kq_fdp;
+ struct proc *p = kq->kq_p;
+ struct filedesc *fdp = p->p_fd;
struct filterops *fops;
struct fileproc *fp = NULL;
struct knote *kn = NULL;
return (EINVAL);
}
+restart:
/* this iocount needs to be dropped if it is not registered */
- if (fops->f_isfd && (error = fp_lookup(p, kev->ident, &fp, 0)) != 0)
- return(error);
-
- restart:
proc_fdlock(p);
+ if (fops->f_isfd && (error = fp_lookup(p, kev->ident, &fp, 1)) != 0) {
+ proc_fdunlock(p);
+ return (error);
+ }
+
if (fops->f_isfd) {
/* fd-based knotes are linked off the fd table */
if (kev->ident < (u_int)fdp->fd_knlistsize) {
/* hash non-fd knotes here too */
if (fdp->fd_knhashmask != 0) {
struct klist *list;
-
+
list = &fdp->fd_knhash[
KN_HASH((u_long)kev->ident, fdp->fd_knhashmask)];
SLIST_FOREACH(kn, list, kn_link)
kev->data = 0;
kn->kn_kevent = *kev;
kn->kn_inuse = 1; /* for f_attach() */
- kn->kn_status = 0;
+ kn->kn_status = KN_ATTACHING;
/* before anyone can find it */
if (kev->flags & EV_DISABLE)
*/
fp = NULL;
- /*
- * If the attach fails here, we can drop it knowing
- * that nobody else has a reference to the knote.
- */
- if ((error = fops->f_attach(kn)) != 0) {
+ error = fops->f_attach(kn);
+
+ kqlock(kq);
+
+ if (error != 0) {
+ /*
+ * Failed to attach correctly, so drop.
+ * All other possible users/droppers
+ * have deferred to us.
+ */
+ kn->kn_status |= KN_DROPPING;
+ kqunlock(kq);
+ knote_drop(kn, p);
+ goto done;
+ } else if (kn->kn_status & KN_DROPPING) {
+ /*
+ * Attach succeeded, but someone else
+ * deferred their drop - now we have
+ * to do it for them (after detaching).
+ */
+ kqunlock(kq);
+ kn->kn_fop->f_detach(kn);
knote_drop(kn, p);
goto done;
}
+ kn->kn_status &= ~KN_ATTACHING;
+ kqunlock(kq);
} else {
proc_fdunlock(p);
error = ENOENT;
/* existing knote - get kqueue lock */
kqlock(kq);
proc_fdunlock(p);
-
+
if (kev->flags & EV_DELETE) {
knote_dequeue(kn);
kn->kn_status |= KN_DISABLED;
}
goto done;
}
-
+
/* update status flags for existing knote */
if (kev->flags & EV_DISABLE) {
knote_dequeue(kn);
knote_enqueue(kn);
}
+ /*
+ * The user may change some filter values after the
+ * initial EV_ADD, but doing so will not reset any
+ * filter which have already been triggered.
+ */
+ kn->kn_kevent.udata = kev->udata;
+ if (fops->f_isfd || fops->f_touch == NULL) {
+ kn->kn_sfflags = kev->fflags;
+ kn->kn_sdata = kev->data;
+ }
+
/*
* If somebody is in the middle of dropping this
* knote - go find/insert a new one. But we have
- * wait for this one to go away first.
+ * wait for this one to go away first. Attaches
+ * running in parallel may also drop/modify the
+ * knote. Wait for those to complete as well and
+ * then start over if we encounter one.
*/
- if (!kqlock2knoteusewait(kq, kn))
- /* kqueue unlocked */
+ if (!kqlock2knoteusewait(kq, kn)) {
+ /* kqueue, proc_fdlock both unlocked */
goto restart;
+ }
/*
- * The user may change some filter values after the
- * initial EV_ADD, but doing so will not reset any
- * filter which have already been triggered.
+ * Call touch routine to notify filter of changes
+ * in filter values.
*/
- kn->kn_sfflags = kev->fflags;
- kn->kn_sdata = kev->data;
- kn->kn_kevent.udata = kev->udata;
+ if (!fops->f_isfd && fops->f_touch != NULL)
+ fops->f_touch(kn, kev, EVENT_REGISTER);
}
-
/* still have use ref on knote */
- if (kn->kn_fop->f_event(kn, 0)) {
+
+ /*
+ * If the knote is not marked to always stay enqueued,
+ * invoke the filter routine to see if it should be
+ * enqueued now.
+ */
+ if ((kn->kn_status & KN_STAYQUEUED) == 0 && kn->kn_fop->f_event(kn, 0)) {
if (knoteuse2kqlock(kq, kn))
- knote_activate(kn);
+ knote_activate(kn, 1);
kqunlock(kq);
} else {
knote_put(kn);
return (error);
}
+
/*
- * kevent_process - process the triggered events in a kqueue
+ * knote_process - process a triggered event
*
- * Walk the queued knotes and validate that they are
- * really still triggered events by calling the filter
- * routines (if necessary). Hold a use reference on
- * the knote to avoid it being detached. For each event
- * that is still considered triggered, invoke the
- * callback routine provided.
+ * Validate that it is really still a triggered event
+ * by calling the filter routines (if necessary). Hold
+ * a use reference on the knote to avoid it being detached.
+ * If it is still considered triggered, invoke the callback
+ * routine provided and move it to the provided inprocess
+ * queue.
*
* caller holds a reference on the kqueue.
* kqueue locked on entry and exit - but may be dropped
*/
-
static int
-kevent_process(struct kqueue *kq,
- kevent_callback_t callback,
- void *data,
- int *countp,
- struct proc *p)
+knote_process(struct knote *kn,
+ kevent_callback_t callback,
+ void *data,
+ struct kqtailq *inprocessp,
+ struct proc *p)
{
- struct knote *kn;
- struct kevent kev;
- int nevents;
+ struct kqueue *kq = kn->kn_kq;
+ struct kevent64_s kev;
+ int touch;
+ int result;
int error;
- restart:
- if (kq->kq_count == 0) {
- *countp = 0;
- return 0;
- }
+ /*
+ * Determine the kevent state we want to return.
+ *
+ * Some event states need to be revalidated before returning
+ * them, others we take the snapshot at the time the event
+ * was enqueued.
+ *
+ * Events with non-NULL f_touch operations must be touched.
+ * Triggered events must fill in kev for the callback.
+ *
+ * Convert our lock to a use-count and call the event's
+ * filter routine(s) to update.
+ */
+ if ((kn->kn_status & KN_DISABLED) != 0) {
+ result = 0;
+ touch = 0;
+ } else {
+ int revalidate;
- /* if someone else is processing the queue, wait */
- if (!TAILQ_EMPTY(&kq->kq_inprocess)) {
- assert_wait(&kq->kq_inprocess, THREAD_UNINT);
- kq->kq_state |= KQ_PROCWAIT;
- kqunlock(kq);
- thread_block(THREAD_CONTINUE_NULL);
- kqlock(kq);
- goto restart;
- }
+ result = 1;
+ revalidate = ((kn->kn_status & KN_STAYQUEUED) != 0 ||
+ (kn->kn_flags & EV_ONESHOT) == 0);
+ touch = (!kn->kn_fop->f_isfd && kn->kn_fop->f_touch != NULL);
- error = 0;
- nevents = 0;
- while (error == 0 &&
- (kn = TAILQ_FIRST(&kq->kq_head)) != NULL) {
+ if (revalidate || touch) {
+ if (revalidate)
+ knote_deactivate(kn);
- /*
- * move knote to the processed queue.
- * this is also protected by the kq lock.
- */
- assert(kn->kn_tq == &kq->kq_head);
- TAILQ_REMOVE(&kq->kq_head, kn, kn_tqe);
- kn->kn_tq = &kq->kq_inprocess;
- TAILQ_INSERT_TAIL(&kq->kq_inprocess, kn, kn_tqe);
+ /* call the filter/touch routines with just a ref */
+ if (kqlock2knoteuse(kq, kn)) {
+ /* if we have to revalidate, call the filter */
+ if (revalidate) {
+ result = kn->kn_fop->f_event(kn, 0);
+ }
- /*
- * Non-EV_ONESHOT events must be re-validated.
- *
- * Convert our lock to a use-count and call the event's
- * filter routine to update.
- *
- * If the event is dropping (or no longer valid), we
- * already have it off the active queue, so just
- * finish the job of deactivating it.
- */
- if ((kn->kn_flags & EV_ONESHOT) == 0) {
- int result;
+ /*
+ * capture the kevent data - using touch if
+ * specified
+ */
+ if (result && touch) {
+ kn->kn_fop->f_touch(kn, &kev,
+ EVENT_PROCESS);
+ }
- if (kqlock2knoteuse(kq, kn)) {
-
- /* call the filter with just a ref */
- result = kn->kn_fop->f_event(kn, 0);
+ /*
+ * convert back to a kqlock - bail if the knote
+ * went away
+ */
+ if (!knoteuse2kqlock(kq, kn)) {
+ return (EJUSTRETURN);
+ } else if (result) {
+ /*
+ * if revalidated as alive, make sure
+ * it's active
+ */
+ if (!(kn->kn_status & KN_ACTIVE)) {
+ knote_activate(kn, 0);
+ }
- if (!knoteuse2kqlock(kq, kn) || result == 0) {
- knote_deactivate(kn);
- continue;
+ /*
+ * capture all events that occurred
+ * during filter
+ */
+ if (!touch) {
+ kev = kn->kn_kevent;
+ }
+
+ } else if ((kn->kn_status & KN_STAYQUEUED) == 0) {
+ /*
+ * was already dequeued, so just bail on
+ * this one
+ */
+ return (EJUSTRETURN);
}
} else {
- knote_deactivate(kn);
- continue;
+ return (EJUSTRETURN);
}
+ } else {
+ kev = kn->kn_kevent;
}
+ }
- /*
- * Got a valid triggered knote with the kqueue
- * still locked. Snapshot the data, and determine
- * how to dispatch the knote for future events.
- */
- kev = kn->kn_kevent;
+ /* move knote onto inprocess queue */
+ assert(kn->kn_tq == &kq->kq_head);
+ TAILQ_REMOVE(&kq->kq_head, kn, kn_tqe);
+ kn->kn_tq = inprocessp;
+ TAILQ_INSERT_TAIL(inprocessp, kn, kn_tqe);
+
+ /*
+ * Determine how to dispatch the knote for future event handling.
+ * not-fired: just return (do not callout).
+ * One-shot: deactivate it.
+ * Clear: deactivate and clear the state.
+ * Dispatch: don't clear state, just deactivate it and mark it disabled.
+ * All others: just leave where they are.
+ */
- /* now what happens to it? */
- if (kn->kn_flags & EV_ONESHOT) {
+ if (result == 0) {
+ return (EJUSTRETURN);
+ } else if ((kn->kn_flags & EV_ONESHOT) != 0) {
+ knote_deactivate(kn);
+ if (kqlock2knotedrop(kq, kn)) {
+ kn->kn_fop->f_detach(kn);
+ knote_drop(kn, p);
+ }
+ } else if ((kn->kn_flags & (EV_CLEAR | EV_DISPATCH)) != 0) {
+ if ((kn->kn_flags & EV_DISPATCH) != 0) {
+ /* deactivate and disable all dispatch knotes */
knote_deactivate(kn);
- if (kqlock2knotedrop(kq, kn)) {
- kn->kn_fop->f_detach(kn);
- knote_drop(kn, p);
- }
- } else if (kn->kn_flags & EV_CLEAR) {
+ kn->kn_status |= KN_DISABLED;
+ } else if (!touch || kn->kn_fflags == 0) {
+ /* only deactivate if nothing since the touch */
knote_deactivate(kn);
+ }
+ if (!touch && (kn->kn_flags & EV_CLEAR) != 0) {
+ /* manually clear non-touch knotes */
kn->kn_data = 0;
kn->kn_fflags = 0;
- kqunlock(kq);
- } else {
- /*
- * leave on in-process queue. We'll
- * move all the remaining ones back
- * the kq queue and wakeup any
- * waiters when we are done.
- */
- kqunlock(kq);
}
-
- /* callback to handle each event as we find it */
- error = (callback)(kq, &kev, data);
- nevents++;
-
- kqlock(kq);
+ kqunlock(kq);
+ } else {
+ /*
+ * leave on inprocess queue. We'll
+ * move all the remaining ones back
+ * the kq queue and wakeup any
+ * waiters when we are done.
+ */
+ kqunlock(kq);
}
- /*
- * With the kqueue still locked, move any knotes
- * remaining on the in-process queue back to the
- * kq's queue and wake up any waiters.
- */
- while ((kn = TAILQ_FIRST(&kq->kq_inprocess)) != NULL) {
- assert(kn->kn_tq == &kq->kq_inprocess);
- TAILQ_REMOVE(&kq->kq_inprocess, kn, kn_tqe);
- kn->kn_tq = &kq->kq_head;
- TAILQ_INSERT_TAIL(&kq->kq_head, kn, kn_tqe);
- }
- if (kq->kq_state & KQ_PROCWAIT) {
- kq->kq_state &= ~KQ_PROCWAIT;
- thread_wakeup(&kq->kq_inprocess);
- }
+ /* callback to handle each event as we find it */
+ error = (callback)(kq, &kev, data);
- *countp = nevents;
- return error;
+ kqlock(kq);
+ return (error);
}
-
-static void
-kevent_scan_continue(void *data, wait_result_t wait_result)
+/*
+ * Return 0 to indicate that processing should proceed,
+ * -1 if there is nothing to process.
+ *
+ * Called with kqueue locked and returns the same way,
+ * but may drop lock temporarily.
+ */
+static int
+kqueue_begin_processing(struct kqueue *kq)
{
- uthread_t ut = (uthread_t)get_bsdthread_info(current_thread());
- struct _kevent_scan * cont_args = &ut->uu_state.ss_kevent_scan;
- struct kqueue *kq = (struct kqueue *)data;
- int error;
- int count;
+ for (;;) {
+ if (kq->kq_count == 0) {
+ return (-1);
+ }
- /* convert the (previous) wait_result to a proper error */
- switch (wait_result) {
- case THREAD_AWAKENED:
- kqlock(kq);
- error = kevent_process(kq, cont_args->call, cont_args, &count, current_proc());
- if (error == 0 && count == 0) {
- assert_wait_deadline(kq, THREAD_ABORTSAFE, cont_args->deadline);
- kq->kq_state |= KQ_SLEEP;
+ /* if someone else is processing the queue, wait */
+ if (kq->kq_nprocess != 0) {
+ wait_queue_assert_wait((wait_queue_t)kq->kq_wqs,
+ &kq->kq_nprocess, THREAD_UNINT, 0);
+ kq->kq_state |= KQ_PROCWAIT;
kqunlock(kq);
- thread_block_parameter(kevent_scan_continue, kq);
- /* NOTREACHED */
+ thread_block(THREAD_CONTINUE_NULL);
+ kqlock(kq);
+ } else {
+ kq->kq_nprocess = 1;
+ return (0);
}
- kqunlock(kq);
- break;
- case THREAD_TIMED_OUT:
- error = EWOULDBLOCK;
- break;
- case THREAD_INTERRUPTED:
- error = EINTR;
- break;
- default:
- panic("kevent_scan_cont() - invalid wait_result (%d)", wait_result);
- error = 0;
}
-
- /* call the continuation with the results */
- assert(cont_args->cont != NULL);
- (cont_args->cont)(kq, cont_args->data, error);
}
-
/*
- * kevent_scan - scan and wait for events in a kqueue
- *
- * Process the triggered events in a kqueue.
+ * Called with kqueue lock held.
+ */
+static void
+kqueue_end_processing(struct kqueue *kq)
+{
+ kq->kq_nprocess = 0;
+ if (kq->kq_state & KQ_PROCWAIT) {
+ kq->kq_state &= ~KQ_PROCWAIT;
+ wait_queue_wakeup_all((wait_queue_t)kq->kq_wqs,
+ &kq->kq_nprocess, THREAD_AWAKENED);
+ }
+}
+
+/*
+ * kqueue_process - process the triggered events in a kqueue
+ *
+ * Walk the queued knotes and validate that they are
+ * really still triggered events by calling the filter
+ * routines (if necessary). Hold a use reference on
+ * the knote to avoid it being detached. For each event
+ * that is still considered triggered, invoke the
+ * callback routine provided.
+ *
+ * caller holds a reference on the kqueue.
+ * kqueue locked on entry and exit - but may be dropped
+ * kqueue list locked (held for duration of call)
+ */
+
+static int
+kqueue_process(struct kqueue *kq,
+ kevent_callback_t callback,
+ void *data,
+ int *countp,
+ struct proc *p)
+{
+ struct kqtailq inprocess;
+ struct knote *kn;
+ int nevents;
+ int error;
+
+ TAILQ_INIT(&inprocess);
+
+ if (kqueue_begin_processing(kq) == -1) {
+ *countp = 0;
+ /* Nothing to process */
+ return (0);
+ }
+
+ /*
+ * Clear any pre-posted status from previous runs, so we
+ * only detect events that occur during this run.
+ */
+ wait_queue_sub_clearrefs(kq->kq_wqs);
+
+ /*
+ * loop through the enqueued knotes, processing each one and
+ * revalidating those that need it. As they are processed,
+ * they get moved to the inprocess queue (so the loop can end).
+ */
+ error = 0;
+ nevents = 0;
+
+ while (error == 0 &&
+ (kn = TAILQ_FIRST(&kq->kq_head)) != NULL) {
+ error = knote_process(kn, callback, data, &inprocess, p);
+ if (error == EJUSTRETURN)
+ error = 0;
+ else
+ nevents++;
+ }
+
+ /*
+ * With the kqueue still locked, move any knotes
+ * remaining on the inprocess queue back to the
+ * kq's queue and wake up any waiters.
+ */
+ while ((kn = TAILQ_FIRST(&inprocess)) != NULL) {
+ assert(kn->kn_tq == &inprocess);
+ TAILQ_REMOVE(&inprocess, kn, kn_tqe);
+ kn->kn_tq = &kq->kq_head;
+ TAILQ_INSERT_TAIL(&kq->kq_head, kn, kn_tqe);
+ }
+
+ kqueue_end_processing(kq);
+
+ *countp = nevents;
+ return (error);
+}
+
+
+static void
+kqueue_scan_continue(void *data, wait_result_t wait_result)
+{
+ thread_t self = current_thread();
+ uthread_t ut = (uthread_t)get_bsdthread_info(self);
+ struct _kqueue_scan * cont_args = &ut->uu_kevent.ss_kqueue_scan;
+ struct kqueue *kq = (struct kqueue *)data;
+ int error;
+ int count;
+
+ /* convert the (previous) wait_result to a proper error */
+ switch (wait_result) {
+ case THREAD_AWAKENED:
+ kqlock(kq);
+ error = kqueue_process(kq, cont_args->call, cont_args, &count,
+ current_proc());
+ if (error == 0 && count == 0) {
+ wait_queue_assert_wait((wait_queue_t)kq->kq_wqs,
+ KQ_EVENT, THREAD_ABORTSAFE, cont_args->deadline);
+ kq->kq_state |= KQ_SLEEP;
+ kqunlock(kq);
+ thread_block_parameter(kqueue_scan_continue, kq);
+ /* NOTREACHED */
+ }
+ kqunlock(kq);
+ break;
+ case THREAD_TIMED_OUT:
+ error = EWOULDBLOCK;
+ break;
+ case THREAD_INTERRUPTED:
+ error = EINTR;
+ break;
+ default:
+ panic("%s: - invalid wait_result (%d)", __func__,
+ wait_result);
+ error = 0;
+ }
+
+ /* call the continuation with the results */
+ assert(cont_args->cont != NULL);
+ (cont_args->cont)(kq, cont_args->data, error);
+}
+
+
+/*
+ * kqueue_scan - scan and wait for events in a kqueue
+ *
+ * Process the triggered events in a kqueue.
*
* If there are no events triggered arrange to
* wait for them. If the caller provided a
*/
int
-kevent_scan(struct kqueue *kq,
+kqueue_scan(struct kqueue *kq,
kevent_callback_t callback,
- kevent_continue_t continuation,
+ kqueue_continue_t continuation,
void *data,
struct timeval *atvp,
struct proc *p)
* triggered.
*/
kqlock(kq);
- error = kevent_process(kq, callback, data, &count, p);
+ error = kqueue_process(kq, callback, data, &count, p);
if (error || count)
break; /* lock still held */
first = 0;
/* convert the timeout to a deadline once */
if (atvp->tv_sec || atvp->tv_usec) {
- uint32_t seconds, nanoseconds;
uint64_t now;
-
+
clock_get_uptime(&now);
nanoseconds_to_absolutetime((uint64_t)atvp->tv_sec * NSEC_PER_SEC +
- atvp->tv_usec * NSEC_PER_USEC,
+ atvp->tv_usec * (long)NSEC_PER_USEC,
&deadline);
if (now >= deadline) {
/* non-blocking call */
if (continuation) {
uthread_t ut = (uthread_t)get_bsdthread_info(current_thread());
- struct _kevent_scan *cont_args = &ut->uu_state.ss_kevent_scan;
-
+ struct _kqueue_scan *cont_args = &ut->uu_kevent.ss_kqueue_scan;
+
cont_args->call = callback;
cont_args->cont = continuation;
cont_args->deadline = deadline;
cont_args->data = data;
- cont = kevent_scan_continue;
+ cont = kqueue_scan_continue;
}
}
/* go ahead and wait */
- assert_wait_deadline(kq, THREAD_ABORTSAFE, deadline);
+ wait_queue_assert_wait_with_leeway((wait_queue_t)kq->kq_wqs,
+ KQ_EVENT, THREAD_ABORTSAFE, TIMEOUT_URGENCY_USER_NORMAL,
+ deadline, 0);
kq->kq_state |= KQ_SLEEP;
kqunlock(kq);
wait_result = thread_block_parameter(cont, kq);
case THREAD_AWAKENED:
continue;
case THREAD_TIMED_OUT:
- return EWOULDBLOCK;
+ return (EWOULDBLOCK);
case THREAD_INTERRUPTED:
- return EINTR;
+ return (EINTR);
default:
- panic("kevent_scan - bad wait_result (%d)",
- wait_result);
+ panic("%s: - bad wait_result (%d)", __func__,
+ wait_result);
error = 0;
}
}
kqunlock(kq);
- return error;
+ return (error);
}
*/
/*ARGSUSED*/
static int
-kqueue_read(__unused struct fileproc *fp,
- __unused struct uio *uio,
- __unused kauth_cred_t cred,
- __unused int flags,
- __unused struct proc *p)
+kqueue_read(__unused struct fileproc *fp,
+ __unused struct uio *uio,
+ __unused int flags,
+ __unused vfs_context_t ctx)
{
return (ENXIO);
}
/*ARGSUSED*/
static int
-kqueue_write(__unused struct fileproc *fp,
- __unused struct uio *uio,
- __unused kauth_cred_t cred,
- __unused int flags,
- __unused struct proc *p)
+kqueue_write(__unused struct fileproc *fp,
+ __unused struct uio *uio,
+ __unused int flags,
+ __unused vfs_context_t ctx)
{
return (ENXIO);
}
/*ARGSUSED*/
static int
-kqueue_ioctl(__unused struct fileproc *fp,
- __unused u_long com,
- __unused caddr_t data,
- __unused struct proc *p)
+kqueue_ioctl(__unused struct fileproc *fp,
+ __unused u_long com,
+ __unused caddr_t data,
+ __unused vfs_context_t ctx)
{
return (ENOTTY);
}
/*ARGSUSED*/
static int
-kqueue_select(struct fileproc *fp, int which, void *wql, struct proc *p)
+kqueue_select(struct fileproc *fp, int which, void *wql,
+ __unused vfs_context_t ctx)
{
struct kqueue *kq = (struct kqueue *)fp->f_data;
+ struct knote *kn;
+ struct kqtailq inprocessq;
int retnum = 0;
- if (which == FREAD) {
- kqlock(kq);
- if (kq->kq_count) {
- retnum = 1;
- } else {
- selrecord(p, &kq->kq_sel, wql);
- kq->kq_state |= KQ_SEL;
- }
+ if (which != FREAD)
+ return (0);
+
+ TAILQ_INIT(&inprocessq);
+
+ kqlock(kq);
+ /*
+ * If this is the first pass, link the wait queue associated with the
+ * the kqueue onto the wait queue set for the select(). Normally we
+ * use selrecord() for this, but it uses the wait queue within the
+ * selinfo structure and we need to use the main one for the kqueue to
+ * catch events from KN_STAYQUEUED sources. So we do the linkage manually.
+ * (The select() call will unlink them when it ends).
+ */
+ if (wql != NULL) {
+ thread_t cur_act = current_thread();
+ struct uthread * ut = get_bsdthread_info(cur_act);
+
+ kq->kq_state |= KQ_SEL;
+ wait_queue_link_noalloc((wait_queue_t)kq->kq_wqs, ut->uu_wqset,
+ (wait_queue_link_t)wql);
+ }
+
+ if (kqueue_begin_processing(kq) == -1) {
kqunlock(kq);
+ return (0);
+ }
+
+ if (kq->kq_count != 0) {
+ /*
+ * there is something queued - but it might be a
+ * KN_STAYQUEUED knote, which may or may not have
+ * any events pending. So, we have to walk the
+ * list of knotes to see, and peek at the stay-
+ * queued ones to be really sure.
+ */
+ while ((kn = (struct knote *)TAILQ_FIRST(&kq->kq_head)) != NULL) {
+ if ((kn->kn_status & KN_STAYQUEUED) == 0) {
+ retnum = 1;
+ goto out;
+ }
+
+ TAILQ_REMOVE(&kq->kq_head, kn, kn_tqe);
+ TAILQ_INSERT_TAIL(&inprocessq, kn, kn_tqe);
+
+ if (kqlock2knoteuse(kq, kn)) {
+ unsigned peek;
+
+ peek = kn->kn_fop->f_peek(kn);
+ if (knoteuse2kqlock(kq, kn)) {
+ if (peek > 0) {
+ retnum = 1;
+ goto out;
+ }
+ } else {
+ retnum = 0;
+ }
+ }
+ }
+ }
+
+out:
+ /* Return knotes to active queue */
+ while ((kn = TAILQ_FIRST(&inprocessq)) != NULL) {
+ TAILQ_REMOVE(&inprocessq, kn, kn_tqe);
+ kn->kn_tq = &kq->kq_head;
+ TAILQ_INSERT_TAIL(&kq->kq_head, kn, kn_tqe);
}
+
+ kqueue_end_processing(kq);
+ kqunlock(kq);
return (retnum);
}
*/
/*ARGSUSED*/
static int
-kqueue_close(struct fileglob *fg, struct proc *p)
+kqueue_close(struct fileglob *fg, __unused vfs_context_t ctx)
{
struct kqueue *kq = (struct kqueue *)fg->fg_data;
- kqueue_dealloc(kq, p);
+ kqueue_dealloc(kq);
fg->fg_data = NULL;
return (0);
}
* that relationship is torn down.
*/
static int
-kqueue_kqfilter(__unused struct fileproc *fp, struct knote *kn, __unused struct proc *p)
+kqueue_kqfilter(__unused struct fileproc *fp, struct knote *kn, __unused vfs_context_t ctx)
{
struct kqueue *kq = (struct kqueue *)kn->kn_fp->f_data;
+ struct kqueue *parentkq = kn->kn_kq;
+
+ if (parentkq == kq ||
+ kn->kn_filter != EVFILT_READ)
+ return (1);
+
+ /*
+ * We have to avoid creating a cycle when nesting kqueues
+ * inside another. Rather than trying to walk the whole
+ * potential DAG of nested kqueues, we just use a simple
+ * ceiling protocol. When a kqueue is inserted into another,
+ * we check that the (future) parent is not already nested
+ * into another kqueue at a lower level than the potenial
+ * child (because it could indicate a cycle). If that test
+ * passes, we just mark the nesting levels accordingly.
+ */
- if (kn->kn_filter != EVFILT_READ)
+ kqlock(parentkq);
+ if (parentkq->kq_level > 0 &&
+ parentkq->kq_level < kq->kq_level)
+ {
+ kqunlock(parentkq);
return (1);
+ } else {
+ /* set parent level appropriately */
+ if (parentkq->kq_level == 0)
+ parentkq->kq_level = 2;
+ if (parentkq->kq_level < kq->kq_level + 1)
+ parentkq->kq_level = kq->kq_level + 1;
+ kqunlock(parentkq);
+
+ kn->kn_fop = &kqread_filtops;
+ kqlock(kq);
+ KNOTE_ATTACH(&kq->kq_sel.si_note, kn);
+ /* indicate nesting in child, if needed */
+ if (kq->kq_level == 0)
+ kq->kq_level = 1;
+ kqunlock(kq);
+ return (0);
+ }
+}
- kn->kn_fop = &kqread_filtops;
+/*
+ * kqueue_drain - called when kq is closed
+ */
+/*ARGSUSED*/
+static int
+kqueue_drain(struct fileproc *fp, __unused vfs_context_t ctx)
+{
+ struct kqueue *kq = (struct kqueue *)fp->f_fglob->fg_data;
kqlock(kq);
- KNOTE_ATTACH(&kq->kq_sel.si_note, kn);
+ kqueue_wakeup(kq, 1);
kqunlock(kq);
return (0);
}
/*ARGSUSED*/
int
-kqueue_stat(struct fileproc *fp, struct stat *st, __unused struct proc *p)
+kqueue_stat(struct kqueue *kq, void *ub, int isstat64, proc_t p)
{
- struct kqueue *kq = (struct kqueue *)fp->f_data;
-
- bzero((void *)st, sizeof(*st));
- st->st_size = kq->kq_count;
- st->st_blksize = sizeof(struct kevent);
- st->st_mode = S_IFIFO;
+ kqlock(kq);
+ if (isstat64 != 0) {
+ struct stat64 *sb64 = (struct stat64 *)ub;
+
+ bzero((void *)sb64, sizeof(*sb64));
+ sb64->st_size = kq->kq_count;
+ if (kq->kq_state & KQ_KEV64)
+ sb64->st_blksize = sizeof(struct kevent64_s);
+ else
+ sb64->st_blksize = IS_64BIT_PROCESS(p) ? sizeof(struct user64_kevent) : sizeof(struct user32_kevent);
+ sb64->st_mode = S_IFIFO;
+ } else {
+ struct stat *sb = (struct stat *)ub;
+
+ bzero((void *)sb, sizeof(*sb));
+ sb->st_size = kq->kq_count;
+ if (kq->kq_state & KQ_KEV64)
+ sb->st_blksize = sizeof(struct kevent64_s);
+ else
+ sb->st_blksize = IS_64BIT_PROCESS(p) ? sizeof(struct user64_kevent) : sizeof(struct user32_kevent);
+ sb->st_mode = S_IFIFO;
+ }
+ kqunlock(kq);
return (0);
}
* Called with the kqueue locked
*/
static void
-kqueue_wakeup(struct kqueue *kq)
+kqueue_wakeup(struct kqueue *kq, int closed)
{
-
- if (kq->kq_state & KQ_SLEEP) {
- kq->kq_state &= ~KQ_SLEEP;
- thread_wakeup(kq);
- }
- if (kq->kq_state & KQ_SEL) {
- kq->kq_state &= ~KQ_SEL;
- selwakeup(&kq->kq_sel);
+ if ((kq->kq_state & (KQ_SLEEP | KQ_SEL)) != 0 || kq->kq_nprocess > 0) {
+ kq->kq_state &= ~(KQ_SLEEP | KQ_SEL);
+ wait_queue_wakeup_all((wait_queue_t)kq->kq_wqs, KQ_EVENT,
+ (closed) ? THREAD_INTERRUPTED : THREAD_AWAKENED);
}
- KNOTE(&kq->kq_sel.si_note, 0);
}
void
* The object lock protects the list. It is assumed
* that the filter/event routine for the object can
* determine that the object is already locked (via
- * the hind) and not deadlock itself.
+ * the hint) and not deadlock itself.
*
* The object lock should also hold off pending
* detach/drop operations. But we'll prevent it here
/* if its not going away and triggered */
if (knoteuse2kqlock(kq, kn) && result)
- knote_activate(kn);
+ knote_activate(kn, 1);
/* lock held again */
}
kqunlock(kq);
{
int ret = SLIST_EMPTY(list);
SLIST_INSERT_HEAD(list, kn, kn_selnext);
- return ret;
+ return (ret);
}
/*
knote_detach(struct klist *list, struct knote *kn)
{
SLIST_REMOVE(list, kn, knote, kn_selnext);
- return SLIST_EMPTY(list);
+ return (SLIST_EMPTY(list));
+}
+
+/*
+ * For a given knote, link a provided wait queue directly with the kqueue.
+ * Wakeups will happen via recursive wait queue support. But nothing will move
+ * the knote to the active list at wakeup (nothing calls knote()). Instead,
+ * we permanently enqueue them here.
+ *
+ * kqueue and knote references are held by caller.
+ *
+ * caller provides the wait queue link structure.
+ */
+int
+knote_link_wait_queue(struct knote *kn, struct wait_queue *wq, wait_queue_link_t wql)
+{
+ struct kqueue *kq = kn->kn_kq;
+ kern_return_t kr;
+
+ kr = wait_queue_link_noalloc(wq, kq->kq_wqs, wql);
+ if (kr == KERN_SUCCESS) {
+ knote_markstayqueued(kn);
+ return (0);
+ } else {
+ return (EINVAL);
+ }
+}
+
+/*
+ * Unlink the provided wait queue from the kqueue associated with a knote.
+ * Also remove it from the magic list of directly attached knotes.
+ *
+ * Note that the unlink may have already happened from the other side, so
+ * ignore any failures to unlink and just remove it from the kqueue list.
+ *
+ * On success, caller is responsible for the link structure
+ */
+int
+knote_unlink_wait_queue(struct knote *kn, struct wait_queue *wq, wait_queue_link_t *wqlp)
+{
+ struct kqueue *kq = kn->kn_kq;
+ kern_return_t kr;
+
+ kr = wait_queue_unlink_nofree(wq, kq->kq_wqs, wqlp);
+ knote_clearstayqueued(kn);
+ return ((kr != KERN_SUCCESS) ? EINVAL : 0);
}
/*
*
* Essentially an inlined knote_remove & knote_drop
* when we know for sure that the thing is a file
- *
+ *
* Entered with the proc_fd lock already held.
* It returns the same way, but may drop it temporarily.
*/
while ((kn = SLIST_FIRST(list)) != NULL) {
struct kqueue *kq = kn->kn_kq;
+ if (kq->kq_p != p)
+ panic("%s: proc mismatch (kq->kq_p=%p != p=%p)",
+ __func__, kq->kq_p, p);
+
kqlock(kq);
proc_fdunlock(p);
kn->kn_fop->f_detach(kn);
knote_drop(kn, p);
}
-
+
proc_fdlock(p);
/* the fd tables may have changed - start over */
/* proc_fdlock held on entry (and exit) */
static int
-knote_fdpattach(struct knote *kn, struct filedesc *fdp, __unused struct proc *p)
+knote_fdpattach(struct knote *kn, struct filedesc *fdp, struct proc *p)
{
struct klist *list = NULL;
if (! kn->kn_fop->f_isfd) {
if (fdp->fd_knhashmask == 0)
- fdp->fd_knhash = hashinit(KN_HASHSIZE, M_KQUEUE,
+ fdp->fd_knhash = hashinit(CONFIG_KN_HASHSIZE, M_KQUEUE,
&fdp->fd_knhashmask);
list = &fdp->fd_knhash[KN_HASH(kn->kn_id, fdp->fd_knhashmask)];
} else {
if ((u_int)fdp->fd_knlistsize <= kn->kn_id) {
u_int size = 0;
+ if (kn->kn_id >= (uint64_t)p->p_rlimit[RLIMIT_NOFILE].rlim_cur
+ || kn->kn_id >= (uint64_t)maxfiles)
+ return (EINVAL);
+
/* have to grow the fd_knlist */
size = fdp->fd_knlistsize;
while (size <= kn->kn_id)
size += KQEXTENT;
+
+ if (size >= (UINT_MAX/sizeof(struct klist *)))
+ return (EINVAL);
+
MALLOC(list, struct klist *,
- size * sizeof(struct klist *), M_KQUEUE, M_WAITOK);
+ size * sizeof(struct klist *), M_KQUEUE, M_WAITOK);
if (list == NULL)
return (ENOMEM);
-
+
bcopy((caddr_t)fdp->fd_knlist, (caddr_t)list,
- fdp->fd_knlistsize * sizeof(struct klist *));
+ fdp->fd_knlistsize * sizeof(struct klist *));
bzero((caddr_t)list +
- fdp->fd_knlistsize * sizeof(struct klist *),
- (size - fdp->fd_knlistsize) * sizeof(struct klist *));
+ fdp->fd_knlistsize * sizeof(struct klist *),
+ (size - fdp->fd_knlistsize) * sizeof(struct klist *));
FREE(fdp->fd_knlist, M_KQUEUE);
fdp->fd_knlist = list;
fdp->fd_knlistsize = size;
* while calling fdrop and free.
*/
static void
-knote_drop(struct knote *kn, struct proc *p)
+knote_drop(struct knote *kn, __unused struct proc *ctxp)
{
- struct filedesc *fdp = p->p_fd;
struct kqueue *kq = kn->kn_kq;
+ struct proc *p = kq->kq_p;
+ struct filedesc *fdp = p->p_fd;
struct klist *list;
+ int needswakeup;
proc_fdlock(p);
if (kn->kn_fop->f_isfd)
SLIST_REMOVE(list, kn, knote, kn_link);
kqlock(kq);
knote_dequeue(kn);
- if (kn->kn_status & KN_DROPWAIT)
- thread_wakeup(&kn->kn_status);
+ needswakeup = (kn->kn_status & KN_USEWAIT);
kqunlock(kq);
proc_fdunlock(p);
+ if (needswakeup)
+ wait_queue_wakeup_all((wait_queue_t)kq->kq_wqs, &kn->kn_status,
+ THREAD_AWAKENED);
+
if (kn->kn_fop->f_isfd)
fp_drop(p, kn->kn_id, kn->kn_fp, 0);
/* called with kqueue lock held */
static void
-knote_activate(struct knote *kn)
+knote_activate(struct knote *kn, int propagate)
{
struct kqueue *kq = kn->kn_kq;
kn->kn_status |= KN_ACTIVE;
knote_enqueue(kn);
- kqueue_wakeup(kq);
- }
+ kqueue_wakeup(kq, 0);
+
+ /* this is a real event: wake up the parent kq, too */
+ if (propagate)
+ KNOTE(&kq->kq_sel.si_note, 0);
+}
/* called with kqueue lock held */
static void
knote_deactivate(struct knote *kn)
-{
+{
kn->kn_status &= ~KN_ACTIVE;
knote_dequeue(kn);
}
static void
knote_enqueue(struct knote *kn)
{
- struct kqueue *kq = kn->kn_kq;
-
- if ((kn->kn_status & (KN_QUEUED | KN_DISABLED)) == 0) {
+ if ((kn->kn_status & (KN_QUEUED | KN_STAYQUEUED)) == KN_STAYQUEUED ||
+ (kn->kn_status & (KN_QUEUED | KN_STAYQUEUED | KN_DISABLED)) == 0) {
struct kqtailq *tq = kn->kn_tq;
+ struct kqueue *kq = kn->kn_kq;
- TAILQ_INSERT_TAIL(tq, kn, kn_tqe);
+ TAILQ_INSERT_TAIL(tq, kn, kn_tqe);
kn->kn_status |= KN_QUEUED;
kq->kq_count++;
}
{
struct kqueue *kq = kn->kn_kq;
- assert((kn->kn_status & KN_DISABLED) == 0);
- if ((kn->kn_status & KN_QUEUED) == KN_QUEUED) {
+ if ((kn->kn_status & (KN_QUEUED | KN_STAYQUEUED)) == KN_QUEUED) {
struct kqtailq *tq = kn->kn_tq;
- TAILQ_REMOVE(tq, kn, kn_tqe);
+ TAILQ_REMOVE(tq, kn, kn_tqe);
kn->kn_tq = &kq->kq_head;
kn->kn_status &= ~KN_QUEUED;
kq->kq_count--;
void
knote_init(void)
{
- knote_zone = zinit(sizeof(struct knote), 8192*sizeof(struct knote), 8192, "knote zone");
+ knote_zone = zinit(sizeof(struct knote), 8192*sizeof(struct knote),
+ 8192, "knote zone");
/* allocate kq lock group attribute and group */
- kq_lck_grp_attr= lck_grp_attr_alloc_init();
+ kq_lck_grp_attr = lck_grp_attr_alloc_init();
kq_lck_grp = lck_grp_alloc_init("kqueue", kq_lck_grp_attr);
/* Initialize the timer filter lock */
lck_mtx_init(&_filt_timerlock, kq_lck_grp, kq_lck_attr);
+
+#if VM_PRESSURE_EVENTS
+ /* Initialize the vm pressure list lock */
+ vm_pressure_init(kq_lck_grp, kq_lck_attr);
+#endif
+
+#if CONFIG_MEMORYSTATUS
+ /* Initialize the memorystatus list lock */
+ memorystatus_kevent_init(kq_lck_grp, kq_lck_attr);
+#endif
}
SYSINIT(knote, SI_SUB_PSEUDO, SI_ORDER_ANY, knote_init, NULL)
zfree(knote_zone, kn);
}
+#if SOCKETS
#include <sys/param.h>
#include <sys/socket.h>
#include <sys/protosw.h>
#include <sys/sys_domain.h>
#include <sys/syslog.h>
+#ifndef ROUNDUP64
+#define ROUNDUP64(x) P2ROUNDUP((x), sizeof (u_int64_t))
+#endif
+
+#ifndef ADVANCE64
+#define ADVANCE64(p, n) (void*)((char *)(p) + ROUNDUP64(n))
+#endif
+
+static lck_grp_attr_t *kev_lck_grp_attr;
+static lck_attr_t *kev_lck_attr;
+static lck_grp_t *kev_lck_grp;
+static decl_lck_rw_data(,kev_lck_data);
+static lck_rw_t *kev_rwlock = &kev_lck_data;
static int kev_attach(struct socket *so, int proto, struct proc *p);
static int kev_detach(struct socket *so);
-static int kev_control(struct socket *so, u_long cmd, caddr_t data, struct ifnet *ifp, struct proc *p);
-
-struct pr_usrreqs event_usrreqs = {
- pru_abort_notsupp, pru_accept_notsupp, kev_attach, pru_bind_notsupp, pru_connect_notsupp,
- pru_connect2_notsupp, kev_control, kev_detach, pru_disconnect_notsupp,
- pru_listen_notsupp, pru_peeraddr_notsupp, pru_rcvd_notsupp, pru_rcvoob_notsupp,
- pru_send_notsupp, pru_sense_null, pru_shutdown_notsupp, pru_sockaddr_notsupp,
- pru_sosend_notsupp, soreceive, pru_sopoll_notsupp
+static int kev_control(struct socket *so, u_long cmd, caddr_t data,
+ struct ifnet *ifp, struct proc *p);
+static lck_mtx_t * event_getlock(struct socket *, int);
+static int event_lock(struct socket *, int, void *);
+static int event_unlock(struct socket *, int, void *);
+
+static int event_sofreelastref(struct socket *);
+static void kev_delete(struct kern_event_pcb *);
+
+static struct pr_usrreqs event_usrreqs = {
+ .pru_attach = kev_attach,
+ .pru_control = kev_control,
+ .pru_detach = kev_detach,
+ .pru_soreceive = soreceive,
};
-struct protosw eventsw[] = {
- {
- SOCK_RAW, &systemdomain, SYSPROTO_EVENT, PR_ATOMIC,
- 0, 0, 0, 0,
- 0,
- 0, 0, 0, 0,
-#if __APPLE__
- 0,
-#endif
- &event_usrreqs,
- 0, 0, 0,
-#if __APPLE__
- {0, 0}, 0, {0}
-#endif
- }
+static struct protosw eventsw[] = {
+{
+ .pr_type = SOCK_RAW,
+ .pr_protocol = SYSPROTO_EVENT,
+ .pr_flags = PR_ATOMIC,
+ .pr_usrreqs = &event_usrreqs,
+ .pr_lock = event_lock,
+ .pr_unlock = event_unlock,
+ .pr_getlock = event_getlock,
+}
};
+__private_extern__ int kevt_getstat SYSCTL_HANDLER_ARGS;
+__private_extern__ int kevt_pcblist SYSCTL_HANDLER_ARGS;
+
+SYSCTL_NODE(_net_systm, OID_AUTO, kevt,
+ CTLFLAG_RW|CTLFLAG_LOCKED, 0, "Kernel event family");
+
+struct kevtstat kevtstat;
+SYSCTL_PROC(_net_systm_kevt, OID_AUTO, stats,
+ CTLTYPE_STRUCT | CTLFLAG_RD | CTLFLAG_LOCKED, 0, 0,
+ kevt_getstat, "S,kevtstat", "");
+
+SYSCTL_PROC(_net_systm_kevt, OID_AUTO, pcblist,
+ CTLTYPE_STRUCT | CTLFLAG_RD | CTLFLAG_LOCKED, 0, 0,
+ kevt_pcblist, "S,xkevtpcb", "");
+
+static lck_mtx_t *
+event_getlock(struct socket *so, int locktype)
+{
+#pragma unused(locktype)
+ struct kern_event_pcb *ev_pcb = (struct kern_event_pcb *)so->so_pcb;
+
+ if (so->so_pcb != NULL) {
+ if (so->so_usecount < 0)
+ panic("%s: so=%p usecount=%d lrh= %s\n", __func__,
+ so, so->so_usecount, solockhistory_nr(so));
+ /* NOTREACHED */
+ } else {
+ panic("%s: so=%p NULL NO so_pcb %s\n", __func__,
+ so, solockhistory_nr(so));
+ /* NOTREACHED */
+ }
+ return (&ev_pcb->evp_mtx);
+}
+
+static int
+event_lock(struct socket *so, int refcount, void *lr)
+{
+ void *lr_saved;
+
+ if (lr == NULL)
+ lr_saved = __builtin_return_address(0);
+ else
+ lr_saved = lr;
+
+ if (so->so_pcb != NULL) {
+ lck_mtx_lock(&((struct kern_event_pcb *)so->so_pcb)->evp_mtx);
+ } else {
+ panic("%s: so=%p NO PCB! lr=%p lrh= %s\n", __func__,
+ so, lr_saved, solockhistory_nr(so));
+ /* NOTREACHED */
+ }
+
+ if (so->so_usecount < 0) {
+ panic("%s: so=%p so_pcb=%p lr=%p ref=%d lrh= %s\n", __func__,
+ so, so->so_pcb, lr_saved, so->so_usecount,
+ solockhistory_nr(so));
+ /* NOTREACHED */
+ }
+
+ if (refcount)
+ so->so_usecount++;
+
+ so->lock_lr[so->next_lock_lr] = lr_saved;
+ so->next_lock_lr = (so->next_lock_lr+1) % SO_LCKDBG_MAX;
+ return (0);
+}
+
+static int
+event_unlock(struct socket *so, int refcount, void *lr)
+{
+ void *lr_saved;
+ lck_mtx_t *mutex_held;
+
+ if (lr == NULL)
+ lr_saved = __builtin_return_address(0);
+ else
+ lr_saved = lr;
+
+ if (refcount)
+ so->so_usecount--;
+
+ if (so->so_usecount < 0) {
+ panic("%s: so=%p usecount=%d lrh= %s\n", __func__,
+ so, so->so_usecount, solockhistory_nr(so));
+ /* NOTREACHED */
+ }
+ if (so->so_pcb == NULL) {
+ panic("%s: so=%p NO PCB usecount=%d lr=%p lrh= %s\n", __func__,
+ so, so->so_usecount, (void *)lr_saved,
+ solockhistory_nr(so));
+ /* NOTREACHED */
+ }
+ mutex_held = (&((struct kern_event_pcb *)so->so_pcb)->evp_mtx);
+
+ lck_mtx_assert(mutex_held, LCK_MTX_ASSERT_OWNED);
+ so->unlock_lr[so->next_unlock_lr] = lr_saved;
+ so->next_unlock_lr = (so->next_unlock_lr+1) % SO_LCKDBG_MAX;
+
+ if (so->so_usecount == 0) {
+ VERIFY(so->so_flags & SOF_PCBCLEARING);
+ event_sofreelastref(so);
+ } else {
+ lck_mtx_unlock(mutex_held);
+ }
+
+ return (0);
+}
+
+static int
+event_sofreelastref(struct socket *so)
+{
+ struct kern_event_pcb *ev_pcb = (struct kern_event_pcb *)so->so_pcb;
+
+ lck_mtx_assert(&(ev_pcb->evp_mtx), LCK_MTX_ASSERT_OWNED);
+
+ so->so_pcb = NULL;
+
+ /*
+ * Disable upcall in the event another thread is in kev_post_msg()
+ * appending record to the receive socket buffer, since sbwakeup()
+ * may release the socket lock otherwise.
+ */
+ so->so_rcv.sb_flags &= ~SB_UPCALL;
+ so->so_snd.sb_flags &= ~SB_UPCALL;
+ so->so_event = sonullevent;
+ lck_mtx_unlock(&(ev_pcb->evp_mtx));
+
+ lck_mtx_assert(&(ev_pcb->evp_mtx), LCK_MTX_ASSERT_NOTOWNED);
+ lck_rw_lock_exclusive(kev_rwlock);
+ LIST_REMOVE(ev_pcb, evp_link);
+ kevtstat.kes_pcbcount--;
+ kevtstat.kes_gencnt++;
+ lck_rw_done(kev_rwlock);
+ kev_delete(ev_pcb);
+
+ sofreelastref(so, 1);
+ return (0);
+}
+
+static int event_proto_count = (sizeof (eventsw) / sizeof (struct protosw));
+
static
struct kern_event_head kern_event_head;
-static u_long static_event_id = 0;
-struct domain *sysdom = &systemdomain;
+static u_int32_t static_event_id = 0;
+
+#define EVPCB_ZONE_MAX 65536
+#define EVPCB_ZONE_NAME "kerneventpcb"
+static struct zone *ev_pcb_zone;
-static lck_grp_t *evt_mtx_grp;
-static lck_attr_t *evt_mtx_attr;
-static lck_grp_attr_t *evt_mtx_grp_attr;
-lck_mtx_t *evt_mutex;
/*
- * Install the protosw's for the NKE manager. Invoked at
- * extension load time
+ * Install the protosw's for the NKE manager. Invoked at extension load time
*/
-int
-kern_event_init(void)
+void
+kern_event_init(struct domain *dp)
{
- int retval;
+ struct protosw *pr;
+ int i;
+
+ VERIFY(!(dp->dom_flags & DOM_INITIALIZED));
+ VERIFY(dp == systemdomain);
- if ((retval = net_add_proto(eventsw, &systemdomain)) != 0) {
- log(LOG_WARNING, "Can't install kernel events protocol (%d)\n", retval);
- return(retval);
+ kev_lck_grp_attr = lck_grp_attr_alloc_init();
+ if (kev_lck_grp_attr == NULL) {
+ panic("%s: lck_grp_attr_alloc_init failed\n", __func__);
+ /* NOTREACHED */
}
-
- /*
- * allocate lock group attribute and group for kern event
- */
- evt_mtx_grp_attr = lck_grp_attr_alloc_init();
- evt_mtx_grp = lck_grp_alloc_init("eventlist", evt_mtx_grp_attr);
-
- /*
- * allocate the lock attribute for mutexes
- */
- evt_mtx_attr = lck_attr_alloc_init();
- evt_mutex = lck_mtx_alloc_init(evt_mtx_grp, evt_mtx_attr);
- if (evt_mutex == NULL)
- return (ENOMEM);
-
- return(KERN_SUCCESS);
+ kev_lck_grp = lck_grp_alloc_init("Kernel Event Protocol",
+ kev_lck_grp_attr);
+ if (kev_lck_grp == NULL) {
+ panic("%s: lck_grp_alloc_init failed\n", __func__);
+ /* NOTREACHED */
+ }
+
+ kev_lck_attr = lck_attr_alloc_init();
+ if (kev_lck_attr == NULL) {
+ panic("%s: lck_attr_alloc_init failed\n", __func__);
+ /* NOTREACHED */
+ }
+
+ lck_rw_init(kev_rwlock, kev_lck_grp, kev_lck_attr);
+ if (kev_rwlock == NULL) {
+ panic("%s: lck_mtx_alloc_init failed\n", __func__);
+ /* NOTREACHED */
+ }
+
+ for (i = 0, pr = &eventsw[0]; i < event_proto_count; i++, pr++)
+ net_add_proto(pr, dp, 1);
+
+ ev_pcb_zone = zinit(sizeof(struct kern_event_pcb),
+ EVPCB_ZONE_MAX * sizeof(struct kern_event_pcb), 0, EVPCB_ZONE_NAME);
+ if (ev_pcb_zone == NULL) {
+ panic("%s: failed allocating ev_pcb_zone", __func__);
+ /* NOTREACHED */
+ }
+ zone_change(ev_pcb_zone, Z_EXPAND, TRUE);
+ zone_change(ev_pcb_zone, Z_CALLERACCT, TRUE);
}
static int
kev_attach(struct socket *so, __unused int proto, __unused struct proc *p)
{
- int error;
- struct kern_event_pcb *ev_pcb;
+ int error = 0;
+ struct kern_event_pcb *ev_pcb;
- error = soreserve(so, KEV_SNDSPACE, KEV_RECVSPACE);
- if (error)
- return error;
+ error = soreserve(so, KEV_SNDSPACE, KEV_RECVSPACE);
+ if (error != 0)
+ return (error);
- MALLOC(ev_pcb, struct kern_event_pcb *, sizeof(struct kern_event_pcb), M_PCB, M_WAITOK);
- if (ev_pcb == 0)
- return ENOBUFS;
+ if ((ev_pcb = (struct kern_event_pcb *)zalloc(ev_pcb_zone)) == NULL) {
+ return (ENOBUFS);
+ }
+ bzero(ev_pcb, sizeof(struct kern_event_pcb));
+ lck_mtx_init(&ev_pcb->evp_mtx, kev_lck_grp, kev_lck_attr);
- ev_pcb->ev_socket = so;
- ev_pcb->vendor_code_filter = 0xffffffff;
+ ev_pcb->evp_socket = so;
+ ev_pcb->evp_vendor_code_filter = 0xffffffff;
- so->so_pcb = (caddr_t) ev_pcb;
- lck_mtx_lock(evt_mutex);
- LIST_INSERT_HEAD(&kern_event_head, ev_pcb, ev_link);
- lck_mtx_unlock(evt_mutex);
+ so->so_pcb = (caddr_t) ev_pcb;
+ lck_rw_lock_exclusive(kev_rwlock);
+ LIST_INSERT_HEAD(&kern_event_head, ev_pcb, evp_link);
+ kevtstat.kes_pcbcount++;
+ kevtstat.kes_gencnt++;
+ lck_rw_done(kev_rwlock);
- return 0;
+ return (error);
}
+static void
+kev_delete(struct kern_event_pcb *ev_pcb)
+{
+ VERIFY(ev_pcb != NULL);
+ lck_mtx_destroy(&ev_pcb->evp_mtx, kev_lck_grp);
+ zfree(ev_pcb_zone, ev_pcb);
+}
static int
kev_detach(struct socket *so)
{
- struct kern_event_pcb *ev_pcb = (struct kern_event_pcb *) so->so_pcb;
+ struct kern_event_pcb *ev_pcb = (struct kern_event_pcb *) so->so_pcb;
- if (ev_pcb != 0) {
- lck_mtx_lock(evt_mutex);
- LIST_REMOVE(ev_pcb, ev_link);
- lck_mtx_unlock(evt_mutex);
- FREE(ev_pcb, M_PCB);
- so->so_pcb = 0;
+ if (ev_pcb != NULL) {
+ soisdisconnected(so);
so->so_flags |= SOF_PCBCLEARING;
- }
+ }
- return 0;
+ return (0);
}
/*
- * For now, kev_vender_code and mbuf_tags use the same
+ * For now, kev_vendor_code and mbuf_tags use the same
* mechanism.
*/
-extern errno_t mbuf_tag_id_find_internal(const char *string, u_long *out_id,
- int create);
-
errno_t kev_vendor_code_find(
const char *string,
- u_long *out_vender_code)
+ u_int32_t *out_vendor_code)
{
if (strlen(string) >= KEV_VENDOR_CODE_MAX_STR_LEN) {
- return EINVAL;
+ return (EINVAL);
}
- return mbuf_tag_id_find_internal(string, out_vender_code, 1);
+ return (net_str_id_find_internal(string, out_vendor_code,
+ NSI_VENDOR_CODE, 1));
}
-extern void mbuf_tag_id_first_last(u_long *first, u_long *last);
-
-errno_t kev_msg_post(struct kev_msg *event_msg)
+errno_t
+kev_msg_post(struct kev_msg *event_msg)
{
- u_long min_vendor, max_vendor;
-
- mbuf_tag_id_first_last(&min_vendor, &max_vendor);
-
+ mbuf_tag_id_t min_vendor, max_vendor;
+
+ net_str_id_first_last(&min_vendor, &max_vendor, NSI_VENDOR_CODE);
+
if (event_msg == NULL)
- return EINVAL;
-
- /* Limit third parties to posting events for registered vendor codes only */
+ return (EINVAL);
+
+ /*
+ * Limit third parties to posting events for registered vendor codes
+ * only
+ */
if (event_msg->vendor_code < min_vendor ||
- event_msg->vendor_code > max_vendor)
- {
- return EINVAL;
+ event_msg->vendor_code > max_vendor) {
+ OSIncrementAtomic64((SInt64 *)&kevtstat.kes_badvendor);
+ return (EINVAL);
}
-
- return kev_post_msg(event_msg);
+ return (kev_post_msg(event_msg));
}
-
-int kev_post_msg(struct kev_msg *event_msg)
+int
+kev_post_msg(struct kev_msg *event_msg)
{
- struct mbuf *m, *m2;
- struct kern_event_pcb *ev_pcb;
- struct kern_event_msg *ev;
- char *tmp;
- unsigned long total_size;
- int i;
+ struct mbuf *m, *m2;
+ struct kern_event_pcb *ev_pcb;
+ struct kern_event_msg *ev;
+ char *tmp;
+ u_int32_t total_size;
+ int i;
/* Verify the message is small enough to fit in one mbuf w/o cluster */
total_size = KEV_MSG_HEADER_SIZE;
-
+
for (i = 0; i < 5; i++) {
if (event_msg->dv[i].data_length == 0)
break;
total_size += event_msg->dv[i].data_length;
}
-
+
if (total_size > MLEN) {
- return EMSGSIZE;
- }
-
- m = m_get(M_DONTWAIT, MT_DATA);
- if (m == 0)
- return ENOBUFS;
-
- ev = mtod(m, struct kern_event_msg *);
- total_size = KEV_MSG_HEADER_SIZE;
-
- tmp = (char *) &ev->event_data[0];
- for (i = 0; i < 5; i++) {
- if (event_msg->dv[i].data_length == 0)
- break;
-
- total_size += event_msg->dv[i].data_length;
- bcopy(event_msg->dv[i].data_ptr, tmp,
- event_msg->dv[i].data_length);
- tmp += event_msg->dv[i].data_length;
- }
-
- ev->id = ++static_event_id;
- ev->total_size = total_size;
- ev->vendor_code = event_msg->vendor_code;
- ev->kev_class = event_msg->kev_class;
- ev->kev_subclass = event_msg->kev_subclass;
- ev->event_code = event_msg->event_code;
-
- m->m_len = total_size;
- lck_mtx_lock(evt_mutex);
- for (ev_pcb = LIST_FIRST(&kern_event_head);
- ev_pcb;
- ev_pcb = LIST_NEXT(ev_pcb, ev_link)) {
-
- if (ev_pcb->vendor_code_filter != KEV_ANY_VENDOR) {
- if (ev_pcb->vendor_code_filter != ev->vendor_code)
- continue;
-
- if (ev_pcb->class_filter != KEV_ANY_CLASS) {
- if (ev_pcb->class_filter != ev->kev_class)
- continue;
-
- if ((ev_pcb->subclass_filter != KEV_ANY_SUBCLASS) &&
- (ev_pcb->subclass_filter != ev->kev_subclass))
- continue;
- }
- }
-
- m2 = m_copym(m, 0, m->m_len, M_NOWAIT);
- if (m2 == 0) {
- m_free(m);
- lck_mtx_unlock(evt_mutex);
- return ENOBUFS;
- }
- socket_lock(ev_pcb->ev_socket, 1);
- if (sbappendrecord(&ev_pcb->ev_socket->so_rcv, m2))
- sorwakeup(ev_pcb->ev_socket);
- socket_unlock(ev_pcb->ev_socket, 1);
- }
-
- m_free(m);
- lck_mtx_unlock(evt_mutex);
- return 0;
+ OSIncrementAtomic64((SInt64 *)&kevtstat.kes_toobig);
+ return (EMSGSIZE);
+ }
+
+ m = m_get(M_DONTWAIT, MT_DATA);
+ if (m == 0) {
+ OSIncrementAtomic64((SInt64 *)&kevtstat.kes_nomem);
+ return (ENOMEM);
+ }
+ ev = mtod(m, struct kern_event_msg *);
+ total_size = KEV_MSG_HEADER_SIZE;
+
+ tmp = (char *) &ev->event_data[0];
+ for (i = 0; i < 5; i++) {
+ if (event_msg->dv[i].data_length == 0)
+ break;
+
+ total_size += event_msg->dv[i].data_length;
+ bcopy(event_msg->dv[i].data_ptr, tmp,
+ event_msg->dv[i].data_length);
+ tmp += event_msg->dv[i].data_length;
+ }
+
+ ev->id = ++static_event_id;
+ ev->total_size = total_size;
+ ev->vendor_code = event_msg->vendor_code;
+ ev->kev_class = event_msg->kev_class;
+ ev->kev_subclass = event_msg->kev_subclass;
+ ev->event_code = event_msg->event_code;
+
+ m->m_len = total_size;
+ lck_rw_lock_shared(kev_rwlock);
+ for (ev_pcb = LIST_FIRST(&kern_event_head);
+ ev_pcb;
+ ev_pcb = LIST_NEXT(ev_pcb, evp_link)) {
+ lck_mtx_lock(&ev_pcb->evp_mtx);
+ if (ev_pcb->evp_socket->so_pcb == NULL) {
+ lck_mtx_unlock(&ev_pcb->evp_mtx);
+ continue;
+ }
+ if (ev_pcb->evp_vendor_code_filter != KEV_ANY_VENDOR) {
+ if (ev_pcb->evp_vendor_code_filter != ev->vendor_code) {
+ lck_mtx_unlock(&ev_pcb->evp_mtx);
+ continue;
+ }
+
+ if (ev_pcb->evp_class_filter != KEV_ANY_CLASS) {
+ if (ev_pcb->evp_class_filter != ev->kev_class) {
+ lck_mtx_unlock(&ev_pcb->evp_mtx);
+ continue;
+ }
+
+ if ((ev_pcb->evp_subclass_filter !=
+ KEV_ANY_SUBCLASS) &&
+ (ev_pcb->evp_subclass_filter !=
+ ev->kev_subclass)) {
+ lck_mtx_unlock(&ev_pcb->evp_mtx);
+ continue;
+ }
+ }
+ }
+
+ m2 = m_copym(m, 0, m->m_len, M_NOWAIT);
+ if (m2 == 0) {
+ OSIncrementAtomic64((SInt64 *)&kevtstat.kes_nomem);
+ m_free(m);
+ lck_mtx_unlock(&ev_pcb->evp_mtx);
+ lck_rw_done(kev_rwlock);
+ return (ENOMEM);
+ }
+ if (sbappendrecord(&ev_pcb->evp_socket->so_rcv, m2)) {
+ /*
+ * We use "m" for the socket stats as it would be
+ * unsafe to use "m2"
+ */
+ so_inc_recv_data_stat(ev_pcb->evp_socket,
+ 1, m->m_len, SO_TC_BE);
+
+ sorwakeup(ev_pcb->evp_socket);
+ OSIncrementAtomic64((SInt64 *)&kevtstat.kes_posted);
+ } else {
+ OSIncrementAtomic64((SInt64 *)&kevtstat.kes_fullsock);
+ }
+ lck_mtx_unlock(&ev_pcb->evp_mtx);
+ }
+ m_free(m);
+ lck_rw_done(kev_rwlock);
+
+ return (0);
}
static int
-kev_control(struct socket *so,
- u_long cmd,
- caddr_t data,
- __unused struct ifnet *ifp,
- __unused struct proc *p)
+kev_control(struct socket *so,
+ u_long cmd,
+ caddr_t data,
+ __unused struct ifnet *ifp,
+ __unused struct proc *p)
{
struct kev_request *kev_req = (struct kev_request *) data;
struct kern_event_pcb *ev_pcb;
struct kev_vendor_code *kev_vendor;
- u_long *id_value = (u_long *) data;
-
-
+ u_int32_t *id_value = (u_int32_t *) data;
+
switch (cmd) {
-
case SIOCGKEVID:
*id_value = static_event_id;
break;
-
case SIOCSKEVFILT:
ev_pcb = (struct kern_event_pcb *) so->so_pcb;
- ev_pcb->vendor_code_filter = kev_req->vendor_code;
- ev_pcb->class_filter = kev_req->kev_class;
- ev_pcb->subclass_filter = kev_req->kev_subclass;
+ ev_pcb->evp_vendor_code_filter = kev_req->vendor_code;
+ ev_pcb->evp_class_filter = kev_req->kev_class;
+ ev_pcb->evp_subclass_filter = kev_req->kev_subclass;
break;
-
case SIOCGKEVFILT:
ev_pcb = (struct kern_event_pcb *) so->so_pcb;
- kev_req->vendor_code = ev_pcb->vendor_code_filter;
- kev_req->kev_class = ev_pcb->class_filter;
- kev_req->kev_subclass = ev_pcb->subclass_filter;
+ kev_req->vendor_code = ev_pcb->evp_vendor_code_filter;
+ kev_req->kev_class = ev_pcb->evp_class_filter;
+ kev_req->kev_subclass = ev_pcb->evp_subclass_filter;
break;
-
case SIOCGKEVVENDOR:
- kev_vendor = (struct kev_vendor_code*)data;
-
+ kev_vendor = (struct kev_vendor_code *)data;
/* Make sure string is NULL terminated */
kev_vendor->vendor_string[KEV_VENDOR_CODE_MAX_STR_LEN-1] = 0;
-
- return mbuf_tag_id_find_internal(kev_vendor->vendor_string,
- &kev_vendor->vendor_code, 0);
-
+ return (net_str_id_find_internal(kev_vendor->vendor_string,
+ &kev_vendor->vendor_code, NSI_VENDOR_CODE, 0));
default:
- return ENOTSUP;
+ return (ENOTSUP);
+ }
+
+ return (0);
+}
+
+int
+kevt_getstat SYSCTL_HANDLER_ARGS
+{
+#pragma unused(oidp, arg1, arg2)
+ int error = 0;
+
+ lck_rw_lock_shared(kev_rwlock);
+
+ if (req->newptr != USER_ADDR_NULL) {
+ error = EPERM;
+ goto done;
+ }
+ if (req->oldptr == USER_ADDR_NULL) {
+ req->oldidx = sizeof(struct kevtstat);
+ goto done;
+ }
+
+ error = SYSCTL_OUT(req, &kevtstat,
+ MIN(sizeof(struct kevtstat), req->oldlen));
+done:
+ lck_rw_done(kev_rwlock);
+
+ return (error);
+}
+
+__private_extern__ int
+kevt_pcblist SYSCTL_HANDLER_ARGS
+{
+#pragma unused(oidp, arg1, arg2)
+ int error = 0;
+ int n, i;
+ struct xsystmgen xsg;
+ void *buf = NULL;
+ size_t item_size = ROUNDUP64(sizeof (struct xkevtpcb)) +
+ ROUNDUP64(sizeof (struct xsocket_n)) +
+ 2 * ROUNDUP64(sizeof (struct xsockbuf_n)) +
+ ROUNDUP64(sizeof (struct xsockstat_n));
+ struct kern_event_pcb *ev_pcb;
+
+ buf = _MALLOC(item_size, M_TEMP, M_WAITOK | M_ZERO);
+ if (buf == NULL)
+ return (ENOMEM);
+
+ lck_rw_lock_shared(kev_rwlock);
+
+ n = kevtstat.kes_pcbcount;
+
+ if (req->oldptr == USER_ADDR_NULL) {
+ req->oldidx = (n + n/8) * item_size;
+ goto done;
+ }
+ if (req->newptr != USER_ADDR_NULL) {
+ error = EPERM;
+ goto done;
+ }
+ bzero(&xsg, sizeof (xsg));
+ xsg.xg_len = sizeof (xsg);
+ xsg.xg_count = n;
+ xsg.xg_gen = kevtstat.kes_gencnt;
+ xsg.xg_sogen = so_gencnt;
+ error = SYSCTL_OUT(req, &xsg, sizeof (xsg));
+ if (error) {
+ goto done;
+ }
+ /*
+ * We are done if there is no pcb
+ */
+ if (n == 0) {
+ goto done;
+ }
+
+ i = 0;
+ for (i = 0, ev_pcb = LIST_FIRST(&kern_event_head);
+ i < n && ev_pcb != NULL;
+ i++, ev_pcb = LIST_NEXT(ev_pcb, evp_link)) {
+ struct xkevtpcb *xk = (struct xkevtpcb *)buf;
+ struct xsocket_n *xso = (struct xsocket_n *)
+ ADVANCE64(xk, sizeof (*xk));
+ struct xsockbuf_n *xsbrcv = (struct xsockbuf_n *)
+ ADVANCE64(xso, sizeof (*xso));
+ struct xsockbuf_n *xsbsnd = (struct xsockbuf_n *)
+ ADVANCE64(xsbrcv, sizeof (*xsbrcv));
+ struct xsockstat_n *xsostats = (struct xsockstat_n *)
+ ADVANCE64(xsbsnd, sizeof (*xsbsnd));
+
+ bzero(buf, item_size);
+
+ lck_mtx_lock(&ev_pcb->evp_mtx);
+
+ xk->kep_len = sizeof(struct xkevtpcb);
+ xk->kep_kind = XSO_EVT;
+ xk->kep_evtpcb = (uint64_t)VM_KERNEL_ADDRPERM(ev_pcb);
+ xk->kep_vendor_code_filter = ev_pcb->evp_vendor_code_filter;
+ xk->kep_class_filter = ev_pcb->evp_class_filter;
+ xk->kep_subclass_filter = ev_pcb->evp_subclass_filter;
+
+ sotoxsocket_n(ev_pcb->evp_socket, xso);
+ sbtoxsockbuf_n(ev_pcb->evp_socket ?
+ &ev_pcb->evp_socket->so_rcv : NULL, xsbrcv);
+ sbtoxsockbuf_n(ev_pcb->evp_socket ?
+ &ev_pcb->evp_socket->so_snd : NULL, xsbsnd);
+ sbtoxsockstat_n(ev_pcb->evp_socket, xsostats);
+
+ lck_mtx_unlock(&ev_pcb->evp_mtx);
+
+ error = SYSCTL_OUT(req, buf, item_size);
+ }
+
+ if (error == 0) {
+ /*
+ * Give the user an updated idea of our state.
+ * If the generation differs from what we told
+ * her before, she knows that something happened
+ * while we were processing this request, and it
+ * might be necessary to retry.
+ */
+ bzero(&xsg, sizeof (xsg));
+ xsg.xg_len = sizeof (xsg);
+ xsg.xg_count = n;
+ xsg.xg_gen = kevtstat.kes_gencnt;
+ xsg.xg_sogen = so_gencnt;
+ error = SYSCTL_OUT(req, &xsg, sizeof (xsg));
+ if (error) {
+ goto done;
+ }
}
-
- return 0;
+
+done:
+ lck_rw_done(kev_rwlock);
+
+ return (error);
}
+#endif /* SOCKETS */
int
fill_kqueueinfo(struct kqueue *kq, struct kqueue_info * kinfo)
{
- struct stat * st;
+ struct vinfo_stat * st;
- /* No need for the funnel as fd is kept alive */
-
st = &kinfo->kq_stat;
- st->st_size = kq->kq_count;
- st->st_blksize = sizeof(struct kevent);
- st->st_mode = S_IFIFO;
+ st->vst_size = kq->kq_count;
+ if (kq->kq_state & KQ_KEV64)
+ st->vst_blksize = sizeof(struct kevent64_s);
+ else
+ st->vst_blksize = sizeof(struct kevent);
+ st->vst_mode = S_IFIFO;
if (kq->kq_state & KQ_SEL)
kinfo->kq_state |= PROC_KQUEUE_SELECT;
if (kq->kq_state & KQ_SLEEP)
kinfo->kq_state |= PROC_KQUEUE_SLEEP;
- return(0);
+ return (0);
+}
+
+
+void
+knote_markstayqueued(struct knote *kn)
+{
+ kqlock(kn->kn_kq);
+ kn->kn_status |= KN_STAYQUEUED;
+ knote_enqueue(kn);
+ kqunlock(kn->kn_kq);
}
+void
+knote_clearstayqueued(struct knote *kn)
+{
+ kqlock(kn->kn_kq);
+ kn->kn_status &= ~KN_STAYQUEUED;
+ knote_dequeue(kn);
+ kqunlock(kn->kn_kq);
+}
projects / apple / xnu.git / blobdiff