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 #define EVFILT_PROCDESC (-8) /* attached to process descriptors */ 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_SENDFILE (-12) /* attached to sendfile requests */ 51 #define EVFILT_EMPTY (-13) /* empty send socket buf */ 52 #define EVFILT_SYSCOUNT 13 53 54 #if defined(__STDC_VERSION__) && __STDC_VERSION__ >= 199901L 55 #define EV_SET(kevp_, a, b, c, d, e, f) do { \ 56 *(kevp_) = (struct kevent){ \ 57 .ident = (a), \ 58 .filter = (b), \ 59 .flags = (c), \ 60 .fflags = (d), \ 61 .data = (e), \ 62 .udata = (f), \ 63 .ext = {0}, \ 64 }; \ 65 } while(0) 66 #else /* Pre-C99 or not STDC (e.g., C++) */ 67 /* The definition of the local variable kevp could possibly conflict 68 * with a user-defined value passed in parameters a-f. 69 */ 70 #define EV_SET(kevp_, a, b, c, d, e, f) do { \ 71 struct kevent *kevp = (kevp_); \ 72 (kevp)->ident = (a); \ 73 (kevp)->filter = (b); \ 74 (kevp)->flags = (c); \ 75 (kevp)->fflags = (d); \ 76 (kevp)->data = (e); \ 77 (kevp)->udata = (f); \ 78 (kevp)->ext[0] = 0; \ 79 (kevp)->ext[1] = 0; \ 80 (kevp)->ext[2] = 0; \ 81 (kevp)->ext[3] = 0; \ 82 } while(0) 83 #endif 84 85 struct kevent { 86 uintptr_t ident; /* identifier for this event */ 87 short filter; /* filter for event */ 88 unsigned short flags; /* action flags for kqueue */ 89 unsigned int fflags; /* filter flag value */ 90 __int64_t data; /* filter data value */ 91 void *udata; /* opaque user data identifier */ 92 __uint64_t ext[4]; /* extensions */ 93 }; 94 95 #if defined(_WANT_FREEBSD11_KEVENT) 96 /* Older structure used in FreeBSD 11.x and older. */ 97 struct kevent_freebsd11 { 98 uintptr_t ident; /* identifier for this event */ 99 short filter; /* filter for event */ 100 unsigned short flags; 101 unsigned int fflags; 102 __intptr_t data; 103 void *udata; /* opaque user data identifier */ 104 }; 105 #endif 106 107 #if defined(_WANT_KEVENT32) || (defined(_KERNEL) && defined(__LP64__)) 108 struct kevent32 { 109 uint32_t ident; /* identifier for this event */ 110 short filter; /* filter for event */ 111 u_short flags; 112 u_int fflags; 113 #ifndef __amd64__ 114 uint32_t pad0; 115 #endif 116 uint32_t data1, data2; 117 uint32_t udata; /* opaque user data identifier */ 118 #ifndef __amd64__ 119 uint32_t pad1; 120 #endif 121 uint32_t ext64[8]; 122 }; 123 124 #ifdef _WANT_FREEBSD11_KEVENT 125 struct kevent32_freebsd11 { 126 u_int32_t ident; /* identifier for this event */ 127 short filter; /* filter for event */ 128 u_short flags; 129 u_int fflags; 130 int32_t data; 131 u_int32_t udata; /* opaque user data identifier */ 132 }; 133 #endif 134 #endif 135 136 /* actions */ 137 #define EV_ADD 0x0001 /* add event to kq (implies enable) */ 138 #define EV_DELETE 0x0002 /* delete event from kq */ 139 #define EV_ENABLE 0x0004 /* enable event */ 140 #define EV_DISABLE 0x0008 /* disable event (not reported) */ 141 #define EV_FORCEONESHOT 0x0100 /* enable _ONESHOT and force trigger */ 142 143 /* flags */ 144 #define EV_ONESHOT 0x0010 /* only report one occurrence */ 145 #define EV_CLEAR 0x0020 /* clear event state after reporting */ 146 #define EV_RECEIPT 0x0040 /* force EV_ERROR on success, data=0 */ 147 #define EV_DISPATCH 0x0080 /* disable event after reporting */ 148 149 #define EV_SYSFLAGS 0xF000 /* reserved by system */ 150 #define EV_DROP 0x1000 /* note should be dropped */ 151 #define EV_FLAG1 0x2000 /* filter-specific flag */ 152 #define EV_FLAG2 0x4000 /* filter-specific flag */ 153 154 /* returned values */ 155 #define EV_EOF 0x8000 /* EOF detected */ 156 #define EV_ERROR 0x4000 /* error, data contains errno */ 157 158 /* 159 * data/hint flags/masks for EVFILT_USER, shared with userspace 160 * 161 * On input, the top two bits of fflags specifies how the lower twenty four 162 * bits should be applied to the stored value of fflags. 163 * 164 * On output, the top two bits will always be set to NOTE_FFNOP and the 165 * remaining twenty four bits will contain the stored fflags value. 166 */ 167 #define NOTE_FFNOP 0x00000000 /* ignore input fflags */ 168 #define NOTE_FFAND 0x40000000 /* AND fflags */ 169 #define NOTE_FFOR 0x80000000 /* OR fflags */ 170 #define NOTE_FFCOPY 0xc0000000 /* copy fflags */ 171 #define NOTE_FFCTRLMASK 0xc0000000 /* masks for operations */ 172 #define NOTE_FFLAGSMASK 0x00ffffff 173 174 #define NOTE_TRIGGER 0x01000000 /* Cause the event to be 175 triggered for output. */ 176 177 /* 178 * data/hint flags for EVFILT_{READ|WRITE}, shared with userspace 179 */ 180 #define NOTE_LOWAT 0x0001 /* low water mark */ 181 #define NOTE_FILE_POLL 0x0002 /* behave like poll() */ 182 183 /* 184 * data/hint flags for EVFILT_VNODE, shared with userspace 185 */ 186 #define NOTE_DELETE 0x0001 /* vnode was removed */ 187 #define NOTE_WRITE 0x0002 /* data contents changed */ 188 #define NOTE_EXTEND 0x0004 /* size increased */ 189 #define NOTE_ATTRIB 0x0008 /* attributes changed */ 190 #define NOTE_LINK 0x0010 /* link count changed */ 191 #define NOTE_RENAME 0x0020 /* vnode was renamed */ 192 #define NOTE_REVOKE 0x0040 /* vnode access was revoked */ 193 #define NOTE_OPEN 0x0080 /* vnode was opened */ 194 #define NOTE_CLOSE 0x0100 /* file closed, fd did not 195 allowed write */ 196 #define NOTE_CLOSE_WRITE 0x0200 /* file closed, fd did allowed 197 write */ 198 #define NOTE_READ 0x0400 /* file was read */ 199 200 /* 201 * data/hint flags for EVFILT_PROC and EVFILT_PROCDESC, shared with userspace 202 */ 203 #define NOTE_EXIT 0x80000000 /* process exited */ 204 #define NOTE_FORK 0x40000000 /* process forked */ 205 #define NOTE_EXEC 0x20000000 /* process exec'd */ 206 #define NOTE_PCTRLMASK 0xf0000000 /* mask for hint bits */ 207 #define NOTE_PDATAMASK 0x000fffff /* mask for pid */ 208 209 /* additional flags for EVFILT_PROC */ 210 #define NOTE_TRACK 0x00000001 /* follow across forks */ 211 #define NOTE_TRACKERR 0x00000002 /* could not track child */ 212 #define NOTE_CHILD 0x00000004 /* am a child process */ 213 214 /* additional flags for EVFILT_TIMER */ 215 #define NOTE_SECONDS 0x00000001 /* data is seconds */ 216 #define NOTE_MSECONDS 0x00000002 /* data is milliseconds */ 217 #define NOTE_USECONDS 0x00000004 /* data is microseconds */ 218 #define NOTE_NSECONDS 0x00000008 /* data is nanoseconds */ 219 #define NOTE_ABSTIME 0x00000010 /* timeout is absolute */ 220 221 struct knote; 222 SLIST_HEAD(klist, knote); 223 struct kqueue; 224 TAILQ_HEAD(kqlist, kqueue); 225 struct knlist { 226 struct klist kl_list; 227 void (*kl_lock)(void *); /* lock function */ 228 void (*kl_unlock)(void *); 229 void (*kl_assert_lock)(void *, int); 230 void *kl_lockarg; /* argument passed to lock functions */ 231 int kl_autodestroy; 232 }; 233 234 #endif 235 236 #ifdef __cplusplus 237 } 238 #endif 239 #endif 240 241