Annotation of sys/sys/event.h, Revision 1.1
1.1 ! nbrk 1: /* $OpenBSD: event.h,v 1.11 2007/05/30 00:23:48 tedu Exp $ */
! 2:
! 3: /*-
! 4: * Copyright (c) 1999,2000,2001 Jonathan Lemon <jlemon@FreeBSD.org>
! 5: * All rights reserved.
! 6: *
! 7: * Redistribution and use in source and binary forms, with or without
! 8: * modification, are permitted provided that the following conditions
! 9: * are met:
! 10: * 1. Redistributions of source code must retain the above copyright
! 11: * notice, this list of conditions and the following disclaimer.
! 12: * 2. Redistributions in binary form must reproduce the above copyright
! 13: * notice, this list of conditions and the following disclaimer in the
! 14: * documentation and/or other materials provided with the distribution.
! 15: *
! 16: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
! 17: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
! 18: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
! 19: * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
! 20: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
! 21: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
! 22: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
! 23: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
! 24: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
! 25: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
! 26: * SUCH DAMAGE.
! 27: *
! 28: * $FreeBSD: src/sys/sys/event.h,v 1.11 2001/02/24 01:41:31 jlemon Exp $
! 29: */
! 30:
! 31: #ifndef _SYS_EVENT_H_
! 32: #define _SYS_EVENT_H_
! 33:
! 34: #define EVFILT_READ (-1)
! 35: #define EVFILT_WRITE (-2)
! 36: #define EVFILT_AIO (-3) /* attached to aio requests */
! 37: #define EVFILT_VNODE (-4) /* attached to vnodes */
! 38: #define EVFILT_PROC (-5) /* attached to struct proc */
! 39: #define EVFILT_SIGNAL (-6) /* attached to struct proc */
! 40: #define EVFILT_TIMER (-7) /* timers */
! 41:
! 42: #define EVFILT_SYSCOUNT 7
! 43:
! 44: #define EV_SET(kevp, a, b, c, d, e, f) do { \
! 45: (kevp)->ident = (a); \
! 46: (kevp)->filter = (b); \
! 47: (kevp)->flags = (c); \
! 48: (kevp)->fflags = (d); \
! 49: (kevp)->data = (e); \
! 50: (kevp)->udata = (f); \
! 51: } while(0)
! 52:
! 53: struct kevent {
! 54: u_int ident; /* identifier for this event */
! 55: short filter; /* filter for event */
! 56: u_short flags;
! 57: u_int fflags;
! 58: int data;
! 59: void *udata; /* opaque user data identifier */
! 60: };
! 61:
! 62: /* actions */
! 63: #define EV_ADD 0x0001 /* add event to kq (implies enable) */
! 64: #define EV_DELETE 0x0002 /* delete event from kq */
! 65: #define EV_ENABLE 0x0004 /* enable event */
! 66: #define EV_DISABLE 0x0008 /* disable event (not reported) */
! 67:
! 68: /* flags */
! 69: #define EV_ONESHOT 0x0010 /* only report one occurrence */
! 70: #define EV_CLEAR 0x0020 /* clear event state after reporting */
! 71:
! 72: #define EV_SYSFLAGS 0xF000 /* reserved by system */
! 73: #define EV_FLAG1 0x2000 /* filter-specific flag */
! 74:
! 75: /* returned values */
! 76: #define EV_EOF 0x8000 /* EOF detected */
! 77: #define EV_ERROR 0x4000 /* error, data contains errno */
! 78:
! 79: /*
! 80: * data/hint flags for EVFILT_{READ|WRITE}, shared with userspace
! 81: */
! 82: #define NOTE_LOWAT 0x0001 /* low water mark */
! 83: #define NOTE_EOF 0x0002 /* return on EOF */
! 84:
! 85: /*
! 86: * data/hint flags for EVFILT_VNODE, shared with userspace
! 87: */
! 88: #define NOTE_DELETE 0x0001 /* vnode was removed */
! 89: #define NOTE_WRITE 0x0002 /* data contents changed */
! 90: #define NOTE_EXTEND 0x0004 /* size increased */
! 91: #define NOTE_ATTRIB 0x0008 /* attributes changed */
! 92: #define NOTE_LINK 0x0010 /* link count changed */
! 93: #define NOTE_RENAME 0x0020 /* vnode was renamed */
! 94: #define NOTE_REVOKE 0x0040 /* vnode access was revoked */
! 95: #define NOTE_TRUNCATE 0x0080 /* vnode was truncated */
! 96:
! 97: /*
! 98: * data/hint flags for EVFILT_PROC, shared with userspace
! 99: */
! 100: #define NOTE_EXIT 0x80000000 /* process exited */
! 101: #define NOTE_FORK 0x40000000 /* process forked */
! 102: #define NOTE_EXEC 0x20000000 /* process exec'd */
! 103: #define NOTE_PCTRLMASK 0xf0000000 /* mask for hint bits */
! 104: #define NOTE_PDATAMASK 0x000fffff /* mask for pid */
! 105:
! 106: /* additional flags for EVFILT_PROC */
! 107: #define NOTE_TRACK 0x00000001 /* follow across forks */
! 108: #define NOTE_TRACKERR 0x00000002 /* could not track child */
! 109: #define NOTE_CHILD 0x00000004 /* am a child process */
! 110:
! 111: /*
! 112: * This is currently visible to userland to work around broken
! 113: * programs which pull in <sys/proc.h> or <sys/selinfo.h>.
! 114: */
! 115: #include <sys/queue.h>
! 116: struct knote;
! 117: SLIST_HEAD(klist, knote);
! 118:
! 119: #ifdef _KERNEL
! 120:
! 121: #define KNOTE(list, hint) if ((list) != NULL) knote(list, hint)
! 122:
! 123: /*
! 124: * Flag indicating hint is a signal. Used by EVFILT_SIGNAL, and also
! 125: * shared by EVFILT_PROC (all knotes attached to p->p_klist)
! 126: */
! 127: #define NOTE_SIGNAL 0x08000000
! 128:
! 129: struct filterops {
! 130: int f_isfd; /* true if ident == filedescriptor */
! 131: int (*f_attach)(struct knote *kn);
! 132: void (*f_detach)(struct knote *kn);
! 133: int (*f_event)(struct knote *kn, long hint);
! 134: };
! 135:
! 136: struct knote {
! 137: SLIST_ENTRY(knote) kn_link; /* for fd */
! 138: SLIST_ENTRY(knote) kn_selnext; /* for struct selinfo */
! 139: TAILQ_ENTRY(knote) kn_tqe;
! 140: struct kqueue *kn_kq; /* which queue we are on */
! 141: struct kevent kn_kevent;
! 142: int kn_status;
! 143: int kn_sfflags; /* saved filter flags */
! 144: int kn_sdata; /* saved data field */
! 145: union {
! 146: struct file *p_fp; /* file data pointer */
! 147: struct proc *p_proc; /* proc pointer */
! 148: } kn_ptr;
! 149: const struct filterops *kn_fop;
! 150: void *kn_hook;
! 151: #define KN_ACTIVE 0x01 /* event has been triggered */
! 152: #define KN_QUEUED 0x02 /* event is on queue */
! 153: #define KN_DISABLED 0x04 /* event is disabled */
! 154: #define KN_DETACHED 0x08 /* knote is detached */
! 155:
! 156: #define kn_id kn_kevent.ident
! 157: #define kn_filter kn_kevent.filter
! 158: #define kn_flags kn_kevent.flags
! 159: #define kn_fflags kn_kevent.fflags
! 160: #define kn_data kn_kevent.data
! 161: #define kn_fp kn_ptr.p_fp
! 162: };
! 163:
! 164: struct proc;
! 165:
! 166: extern void knote(struct klist *list, long hint);
! 167: extern void knote_remove(struct proc *p, struct klist *list);
! 168: extern void knote_fdclose(struct proc *p, int fd);
! 169: extern int kqueue_register(struct kqueue *kq,
! 170: struct kevent *kev, struct proc *p);
! 171: extern int filt_seltrue(struct knote *kn, long hint);
! 172: extern void klist_invalidate(struct klist *);
! 173:
! 174: #else /* !_KERNEL */
! 175:
! 176: #include <sys/cdefs.h>
! 177: struct timespec;
! 178:
! 179: __BEGIN_DECLS
! 180: int kqueue(void);
! 181: int kevent(int kq, const struct kevent *changelist, int nchanges,
! 182: struct kevent *eventlist, int nevents,
! 183: const struct timespec *timeout);
! 184: __END_DECLS
! 185:
! 186: #endif /* !_KERNEL */
! 187:
! 188: #endif /* !_SYS_EVENT_H_ */
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