| /*- |
| * Copyright (c) 1999,2000,2001 Jonathan Lemon <jlemon@FreeBSD.org> |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND |
| * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE |
| * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| * SUCH DAMAGE. |
| * |
| * $FreeBSD: src/sys/sys/event.h,v 1.19 2002/03/23 08:46:51 bde Exp $ |
| */ |
| |
| #ifndef _SYS_EVENT_H_ |
| #define _SYS_EVENT_H_ |
| |
| #define EVFILT_READ (-1) |
| #define EVFILT_WRITE (-2) |
| #define EVFILT_AIO (-3) /* attached to aio requests */ |
| #define EVFILT_VNODE (-4) /* attached to vnodes */ |
| #define EVFILT_PROC (-5) /* attached to struct proc */ |
| #define EVFILT_SIGNAL (-6) /* attached to struct proc */ |
| #define EVFILT_TIMER (-7) /* timers */ |
| #define EVFILT_NETDEV (-8) /* network devices */ |
| |
| #define EVFILT_SYSCOUNT 8 |
| |
| #define EV_SET(kevp, a, b, c, d, e, f) do { \ |
| (kevp)->ident = (a); \ |
| (kevp)->filter = (b); \ |
| (kevp)->flags = (c); \ |
| (kevp)->fflags = (d); \ |
| (kevp)->data = (e); \ |
| (kevp)->udata = (f); \ |
| } while(0) |
| |
| struct kevent { |
| unsigned int * ident; /* identifier for this event */ |
| short filter; /* filter for event */ |
| u_short flags; |
| u_int fflags; |
| int * data; |
| void *udata; /* opaque user data identifier */ |
| }; |
| |
| /* actions */ |
| #define EV_ADD 0x0001 /* add event to kq (implies enable) */ |
| #define EV_DELETE 0x0002 /* delete event from kq */ |
| #define EV_ENABLE 0x0004 /* enable event */ |
| #define EV_DISABLE 0x0008 /* disable event (not reported) */ |
| |
| /* flags */ |
| #define EV_ONESHOT 0x0010 /* only report one occurrence */ |
| #define EV_CLEAR 0x0020 /* clear event state after reporting */ |
| |
| #define EV_SYSFLAGS 0xF000 /* reserved by system */ |
| #define EV_FLAG1 0x2000 /* filter-specific flag */ |
| |
| /* returned values */ |
| #define EV_EOF 0x8000 /* EOF detected */ |
| #define EV_ERROR 0x4000 /* error, data contains errno */ |
| |
| /* |
| * data/hint flags for EVFILT_{READ|WRITE}, shared with userspace |
| */ |
| #define NOTE_LOWAT 0x0001 /* low water mark */ |
| |
| /* |
| * data/hint flags for EVFILT_VNODE, shared with userspace |
| */ |
| #define NOTE_DELETE 0x0001 /* vnode was removed */ |
| #define NOTE_WRITE 0x0002 /* data contents changed */ |
| #define NOTE_EXTEND 0x0004 /* size increased */ |
| #define NOTE_ATTRIB 0x0008 /* attributes changed */ |
| #define NOTE_LINK 0x0010 /* link count changed */ |
| #define NOTE_RENAME 0x0020 /* vnode was renamed */ |
| #define NOTE_REVOKE 0x0040 /* vnode access was revoked */ |
| |
| /* |
| * data/hint flags for EVFILT_PROC, shared with userspace |
| */ |
| #define NOTE_EXIT 0x80000000 /* process exited */ |
| #define NOTE_FORK 0x40000000 /* process forked */ |
| #define NOTE_EXEC 0x20000000 /* process exec'd */ |
| #define NOTE_PCTRLMASK 0xf0000000 /* mask for hint bits */ |
| #define NOTE_PDATAMASK 0x000fffff /* mask for pid */ |
| |
| /* additional flags for EVFILT_PROC */ |
| #define NOTE_TRACK 0x00000001 /* follow across forks */ |
| #define NOTE_TRACKERR 0x00000002 /* could not track child */ |
| #define NOTE_CHILD 0x00000004 /* am a child process */ |
| |
| /* |
| * data/hint flags for EVFILT_NETDEV, shared with userspace |
| */ |
| #define NOTE_LINKUP 0x0001 /* link is up */ |
| #define NOTE_LINKDOWN 0x0002 /* link is down */ |
| #define NOTE_LINKINV 0x0004 /* link state is invalid */ |
| |
| /* |
| * This is currently visible to userland to work around broken |
| * programs which pull in <sys/proc.h> or <sys/select.h>. |
| */ |
| #include <sys/queue.h> |
| struct knote; |
| |
| #ifdef _KERNEL |
| |
| #ifdef MALLOC_DECLARE |
| MALLOC_DECLARE(M_KQUEUE); |
| #endif |
| |
| #define KNOTE(list, hint) if ((list) != NULL) knote(list, hint) |
| |
| /* |
| * Flag indicating hint is a signal. Used by EVFILT_SIGNAL, and also |
| * shared by EVFILT_PROC (all knotes attached to p->p_klist) |
| */ |
| #define NOTE_SIGNAL 0x08000000 |
| |
| struct filterops { |
| int f_isfd; /* true if ident == filedescriptor */ |
| int (*f_attach)(struct knote *kn); |
| void (*f_detach)(struct knote *kn); |
| int (*f_event)(struct knote *kn, long hint); |
| }; |
| |
| struct knote { |
| SLIST_ENTRY(knote) kn_link; /* for fd */ |
| SLIST_ENTRY(knote) kn_selnext; /* for struct selinfo */ |
| TAILQ_ENTRY(knote) kn_tqe; |
| struct kqueue *kn_kq; /* which queue we are on */ |
| struct kevent kn_kevent; |
| int kn_status; |
| int kn_sfflags; /* saved filter flags */ |
| intptr_t kn_sdata; /* saved data field */ |
| union { |
| struct file *p_fp; /* file data pointer */ |
| struct proc *p_proc; /* proc pointer */ |
| } kn_ptr; |
| struct filterops *kn_fop; |
| caddr_t kn_hook; |
| #define KN_ACTIVE 0x01 /* event has been triggered */ |
| #define KN_QUEUED 0x02 /* event is on queue */ |
| #define KN_DISABLED 0x04 /* event is disabled */ |
| #define KN_DETACHED 0x08 /* knote is detached */ |
| |
| #define kn_id kn_kevent.ident |
| #define kn_filter kn_kevent.filter |
| #define kn_flags kn_kevent.flags |
| #define kn_fflags kn_kevent.fflags |
| #define kn_data kn_kevent.data |
| #define kn_fp kn_ptr.p_fp |
| }; |
| |
| struct thread; |
| struct proc; |
| |
| extern void knote(struct klist *list, long hint); |
| extern void knote_remove(struct thread *p, struct klist *list); |
| extern void knote_fdclose(struct thread *p, int fd); |
| extern int kqueue_register(struct kqueue *kq, |
| struct kevent *kev, struct thread *p); |
| extern int kqueue_add_filteropts(int filt, struct filterops *filtops); |
| extern int kqueue_del_filteropts(int filt); |
| |
| #else /* !_KERNEL */ |
| |
| #include <sys/cdefs.h> |
| struct timespec; |
| |
| __BEGIN_DECLS |
| int kqueue(void); |
| int kevent(int kq, const struct kevent *changelist, int nchanges, |
| struct kevent *eventlist, int nevents, |
| const struct timespec *timeout); |
| __END_DECLS |
| |
| #endif /* !_KERNEL */ |
| |
| #endif /* !_SYS_EVENT_H_ */ |