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Diffstat (limited to 'sys/sys/event.h')
-rw-r--r-- | sys/sys/event.h | 153 |
1 files changed, 153 insertions, 0 deletions
diff --git a/sys/sys/event.h b/sys/sys/event.h new file mode 100644 index 0000000..0e35fac --- /dev/null +++ b/sys/sys/event.h @@ -0,0 +1,153 @@ +/*- + * Copyright (c) 1999,2000 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. + * + * $FreeBSD$ + */ + +#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_SYSCOUNT 6 + +struct kevent { + u_long ident; /* identifier for this event */ + short filter; /* filter for event */ + u_short flags; + u_int fflags; + long 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_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 */ + +/* + * 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 */ + +/* + * 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; +SLIST_HEAD(klist, knote); + +#ifdef _KERNEL + +#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) __P((struct knote *kn)); + void (*f_detach) __P((struct knote *kn)); + int (*f_event) __P((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 */ + u_long 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; +#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 proc; + +extern void knote(struct klist *list, long hint); +extern void knote_remove(struct proc *p, struct klist *list); +extern void knote_fdclose(struct proc *p, int fd); +extern int kqueue_register(struct kqueue *kq, + struct kevent *kev, struct proc *p); + +#endif /* !_KERNEL */ + +#endif /* !_SYS_EVENT_H_ */ |