1 /* 2 * Copyright (C) 2017-2021 THL A29 Limited, a Tencent company. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions are met: 7 * 8 * 1. Redistributions of source code must retain the above copyright notice, this 9 * list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright notice, 11 * this list of conditions and the following disclaimer in the documentation 12 * and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 16 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 17 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR 18 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 19 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 20 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND 21 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 23 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 24 * 25 */ 26 27 #ifndef _FSTACK_EVENT_H 28 #define _FSTACK_EVENT_H 29 30 #ifdef __cplusplus 31 extern "C" { 32 #endif 33 34 #ifndef _KERNEL 35 36 #include <stdint.h> 37 #include <sys/queue.h> 38 39 #define EVFILT_READ (-1) 40 #define EVFILT_WRITE (-2) 41 #define EVFILT_AIO (-3) /* attached to aio requests */ 42 #define EVFILT_VNODE (-4) /* attached to vnodes */ 43 #define EVFILT_PROC (-5) /* attached to struct proc */ 44 #define EVFILT_SIGNAL (-6) /* attached to struct proc */ 45 #define EVFILT_TIMER (-7) /* timers */ 46 /* EVFILT_NETDEV (-8) no longer supported */ 47 #define EVFILT_FS (-9) /* filesystem events */ 48 #define EVFILT_LIO (-10) /* attached to lio requests */ 49 #define EVFILT_USER (-11) /* User events */ 50 #define EVFILT_SYSCOUNT 11 51 52 #define EV_SET(kevp_, a, b, c, d, e, f) do { \ 53 struct kevent *kevp = (kevp_); \ 54 (kevp)->ident = (a); \ 55 (kevp)->filter = (b); \ 56 (kevp)->flags = (c); \ 57 (kevp)->fflags = (d); \ 58 (kevp)->data = (e); \ 59 (kevp)->udata = (f); \ 60 } while(0) 61 62 struct kevent { 63 uintptr_t ident; /* identifier for this event */ 64 short filter; /* filter for event */ 65 u_short flags; 66 u_int fflags; 67 intptr_t data; 68 void *udata; /* opaque user data identifier */ 69 }; 70 71 /* actions */ 72 #define EV_ADD 0x0001 /* add event to kq (implies enable) */ 73 #define EV_DELETE 0x0002 /* delete event from kq */ 74 #define EV_ENABLE 0x0004 /* enable event */ 75 #define EV_DISABLE 0x0008 /* disable event (not reported) */ 76 77 /* flags */ 78 #define EV_ONESHOT 0x0010 /* only report one occurrence */ 79 #define EV_CLEAR 0x0020 /* clear event state after reporting */ 80 #define EV_RECEIPT 0x0040 /* force EV_ERROR on success, data=0 */ 81 #define EV_DISPATCH 0x0080 /* disable event after reporting */ 82 83 #define EV_SYSFLAGS 0xF000 /* reserved by system */ 84 #define EV_DROP 0x1000 /* note should be dropped */ 85 #define EV_FLAG1 0x2000 /* filter-specific flag */ 86 87 /* returned values */ 88 #define EV_EOF 0x8000 /* EOF detected */ 89 #define EV_ERROR 0x4000 /* error, data contains errno */ 90 91 /* 92 * data/hint flags/masks for EVFILT_USER, shared with userspace 93 * 94 * On input, the top two bits of fflags specifies how the lower twenty four 95 * bits should be applied to the stored value of fflags. 96 * 97 * On output, the top two bits will always be set to NOTE_FFNOP and the 98 * remaining twenty four bits will contain the stored fflags value. 99 */ 100 #define NOTE_FFNOP 0x00000000 /* ignore input fflags */ 101 #define NOTE_FFAND 0x40000000 /* AND fflags */ 102 #define NOTE_FFOR 0x80000000 /* OR fflags */ 103 #define NOTE_FFCOPY 0xc0000000 /* copy fflags */ 104 #define NOTE_FFCTRLMASK 0xc0000000 /* masks for operations */ 105 #define NOTE_FFLAGSMASK 0x00ffffff 106 107 #define NOTE_TRIGGER 0x01000000 /* Cause the event to be 108 triggered for output. */ 109 110 /* 111 * data/hint flags for EVFILT_{READ|WRITE}, shared with userspace 112 */ 113 #define NOTE_LOWAT 0x0001 /* low water mark */ 114 115 /* 116 * data/hint flags for EVFILT_VNODE, shared with userspace 117 */ 118 #define NOTE_DELETE 0x0001 /* vnode was removed */ 119 #define NOTE_WRITE 0x0002 /* data contents changed */ 120 #define NOTE_EXTEND 0x0004 /* size increased */ 121 #define NOTE_ATTRIB 0x0008 /* attributes changed */ 122 #define NOTE_LINK 0x0010 /* link count changed */ 123 #define NOTE_RENAME 0x0020 /* vnode was renamed */ 124 #define NOTE_REVOKE 0x0040 /* vnode access was revoked */ 125 126 /* 127 * data/hint flags for EVFILT_PROC, shared with userspace 128 */ 129 #define NOTE_EXIT 0x80000000 /* process exited */ 130 #define NOTE_FORK 0x40000000 /* process forked */ 131 #define NOTE_EXEC 0x20000000 /* process exec'd */ 132 #define NOTE_PCTRLMASK 0xf0000000 /* mask for hint bits */ 133 #define NOTE_PDATAMASK 0x000fffff /* mask for pid */ 134 135 /* additional flags for EVFILT_PROC */ 136 #define NOTE_TRACK 0x00000001 /* follow across forks */ 137 #define NOTE_TRACKERR 0x00000002 /* could not track child */ 138 #define NOTE_CHILD 0x00000004 /* am a child process */ 139 140 struct knote; 141 SLIST_HEAD(klist, knote); 142 struct kqueue; 143 TAILQ_HEAD(kqlist, kqueue); 144 struct knlist { 145 struct klist kl_list; 146 void (*kl_lock)(void *); /* lock function */ 147 void (*kl_unlock)(void *); 148 void (*kl_assert_locked)(void *); 149 void (*kl_assert_unlocked)(void *); 150 void *kl_lockarg; /* argument passed to kl_lockf() */ 151 }; 152 153 #endif 154 155 #ifdef __cplusplus 156 } 157 #endif 158 #endif 159 160