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f-stack/lib/ff_event.h

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/*
* Copyright (C) 2017-2021 THL A29 Limited, a Tencent company.
* 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 COPYRIGHT HOLDERS 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 COPYRIGHT OWNER 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.
*
*/
#ifndef _FSTACK_EVENT_H
#define _FSTACK_EVENT_H
#ifdef __cplusplus
extern "C" {
#endif
#ifndef _KERNEL
#include <stdint.h>
#include <sys/queue.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_PROCDESC (-8) /* attached to process descriptors */
#define EVFILT_FS (-9) /* filesystem events */
#define EVFILT_LIO (-10) /* attached to lio requests */
#define EVFILT_USER (-11) /* User events */
#define EVFILT_SENDFILE (-12) /* attached to sendfile requests */
#define EVFILT_EMPTY (-13) /* empty send socket buf */
#define EVFILT_SYSCOUNT 13
#if defined(__STDC_VERSION__) && __STDC_VERSION__ >= 199901L
#define EV_SET(kevp_, a, b, c, d, e, f) do { \
*(kevp_) = (struct kevent){ \
.ident = (a), \
.filter = (b), \
.flags = (c), \
.fflags = (d), \
.data = (e), \
.udata = (f), \
.ext = {0}, \
}; \
} while(0)
#else /* Pre-C99 or not STDC (e.g., C++) */
/* The definition of the local variable kevp could possibly conflict
* with a user-defined value passed in parameters a-f.
*/
#define EV_SET(kevp_, a, b, c, d, e, f) do { \
struct kevent *kevp = (kevp_); \
(kevp)->ident = (a); \
(kevp)->filter = (b); \
(kevp)->flags = (c); \
(kevp)->fflags = (d); \
(kevp)->data = (e); \
(kevp)->udata = (f); \
(kevp)->ext[0] = 0; \
(kevp)->ext[1] = 0; \
(kevp)->ext[2] = 0; \
(kevp)->ext[3] = 0; \
} while(0)
#endif
struct kevent {
uintptr_t ident; /* identifier for this event */
short filter; /* filter for event */
unsigned short flags; /* action flags for kqueue */
unsigned int fflags; /* filter flag value */
__int64_t data; /* filter data value */
void *udata; /* opaque user data identifier */
__uint64_t ext[4]; /* extensions */
};
#if defined(_WANT_FREEBSD11_KEVENT)
/* Older structure used in FreeBSD 11.x and older. */
struct kevent_freebsd11 {
uintptr_t ident; /* identifier for this event */
short filter; /* filter for event */
unsigned short flags;
unsigned int fflags;
__intptr_t data;
void *udata; /* opaque user data identifier */
};
#endif
#if defined(_WANT_KEVENT32) || (defined(_KERNEL) && defined(__LP64__))
struct kevent32 {
uint32_t ident; /* identifier for this event */
short filter; /* filter for event */
u_short flags;
u_int fflags;
#ifndef __amd64__
uint32_t pad0;
#endif
uint32_t data1, data2;
uint32_t udata; /* opaque user data identifier */
#ifndef __amd64__
uint32_t pad1;
#endif
uint32_t ext64[8];
};
#ifdef _WANT_FREEBSD11_KEVENT
struct kevent32_freebsd11 {
u_int32_t ident; /* identifier for this event */
short filter; /* filter for event */
u_short flags;
u_int fflags;
int32_t data;
u_int32_t udata; /* opaque user data identifier */
};
#endif
#endif
/* actions */
#define EV_ADD 0x0001 /* add event to kq (implies enable) */
#define EV_DELETE 0x0002 /* delete event from kq */
#define EV_ENABLE 0x0004 /* enable event */
#define EV_DISABLE 0x0008 /* disable event (not reported) */
#define EV_FORCEONESHOT 0x0100 /* enable _ONESHOT and force trigger */
/* flags */
#define EV_ONESHOT 0x0010 /* only report one occurrence */
#define EV_CLEAR 0x0020 /* clear event state after reporting */
#define EV_RECEIPT 0x0040 /* force EV_ERROR on success, data=0 */
#define EV_DISPATCH 0x0080 /* disable event after reporting */
#define EV_SYSFLAGS 0xF000 /* reserved by system */
#define EV_DROP 0x1000 /* note should be dropped */
#define EV_FLAG1 0x2000 /* filter-specific flag */
#define EV_FLAG2 0x4000 /* filter-specific flag */
/* returned values */
#define EV_EOF 0x8000 /* EOF detected */
#define EV_ERROR 0x4000 /* error, data contains errno */
/*
* data/hint flags/masks for EVFILT_USER, shared with userspace
*
* On input, the top two bits of fflags specifies how the lower twenty four
* bits should be applied to the stored value of fflags.
*
* On output, the top two bits will always be set to NOTE_FFNOP and the
* remaining twenty four bits will contain the stored fflags value.
*/
#define NOTE_FFNOP 0x00000000 /* ignore input fflags */
#define NOTE_FFAND 0x40000000 /* AND fflags */
#define NOTE_FFOR 0x80000000 /* OR fflags */
#define NOTE_FFCOPY 0xc0000000 /* copy fflags */
#define NOTE_FFCTRLMASK 0xc0000000 /* masks for operations */
#define NOTE_FFLAGSMASK 0x00ffffff
#define NOTE_TRIGGER 0x01000000 /* Cause the event to be
triggered for output. */
/*
* data/hint flags for EVFILT_{READ|WRITE}, shared with userspace
*/
#define NOTE_LOWAT 0x0001 /* low water mark */
#define NOTE_FILE_POLL 0x0002 /* behave like poll() */
/*
* 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 */
#define NOTE_OPEN 0x0080 /* vnode was opened */
#define NOTE_CLOSE 0x0100 /* file closed, fd did not
allowed write */
#define NOTE_CLOSE_WRITE 0x0200 /* file closed, fd did allowed
write */
#define NOTE_READ 0x0400 /* file was read */
/*
* data/hint flags for EVFILT_PROC and EVFILT_PROCDESC, 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 */
/* additional flags for EVFILT_TIMER */
#define NOTE_SECONDS 0x00000001 /* data is seconds */
#define NOTE_MSECONDS 0x00000002 /* data is milliseconds */
#define NOTE_USECONDS 0x00000004 /* data is microseconds */
#define NOTE_NSECONDS 0x00000008 /* data is nanoseconds */
#define NOTE_ABSTIME 0x00000010 /* timeout is absolute */
struct knote;
SLIST_HEAD(klist, knote);
struct kqueue;
TAILQ_HEAD(kqlist, kqueue);
struct knlist {
struct klist kl_list;
void (*kl_lock)(void *); /* lock function */
void (*kl_unlock)(void *);
void (*kl_assert_lock)(void *, int);
void *kl_lockarg; /* argument passed to lock functions */
int kl_autodestroy;
};
#endif
#ifdef __cplusplus
}
#endif
#endif
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