1 | /* |
1 | /* |
2 | * libev epoll fd activity backend |
2 | * libev epoll fd activity backend |
3 | * |
3 | * |
4 | * Copyright (c) 2007,2008,2009,2010,2011 Marc Alexander Lehmann <libev@schmorp.de> |
4 | * Copyright (c) 2007,2008,2009,2010,2011,2016,2017,2019 Marc Alexander Lehmann <libev@schmorp.de> |
5 | * All rights reserved. |
5 | * All rights reserved. |
6 | * |
6 | * |
7 | * Redistribution and use in source and binary forms, with or without modifica- |
7 | * Redistribution and use in source and binary forms, with or without modifica- |
8 | * tion, are permitted provided that the following conditions are met: |
8 | * tion, are permitted provided that the following conditions are met: |
9 | * |
9 | * |
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122 | anfds [fd].emask = EV_EMASK_EPERM; |
122 | anfds [fd].emask = EV_EMASK_EPERM; |
123 | |
123 | |
124 | /* add fd to epoll_eperms, if not already inside */ |
124 | /* add fd to epoll_eperms, if not already inside */ |
125 | if (!(oldmask & EV_EMASK_EPERM)) |
125 | if (!(oldmask & EV_EMASK_EPERM)) |
126 | { |
126 | { |
127 | array_needsize (int, epoll_eperms, epoll_epermmax, epoll_epermcnt + 1, EMPTY2); |
127 | array_needsize (int, epoll_eperms, epoll_epermmax, epoll_epermcnt + 1, array_needsize_noinit); |
128 | epoll_eperms [epoll_epermcnt++] = fd; |
128 | epoll_eperms [epoll_epermcnt++] = fd; |
129 | } |
129 | } |
130 | |
130 | |
131 | return; |
131 | return; |
132 | } |
132 | } |
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133 | else |
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134 | assert (("libev: I/O watcher with invalid fd found in epoll_ctl", errno != EBADF && errno != ELOOP && errno != EINVAL)); |
133 | |
135 | |
134 | fd_kill (EV_A_ fd); |
136 | fd_kill (EV_A_ fd); |
135 | |
137 | |
136 | dec_egen: |
138 | dec_egen: |
137 | /* we didn't successfully call epoll_ctl, so decrement the generation counter again */ |
139 | /* we didn't successfully call epoll_ctl, so decrement the generation counter again */ |
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233 | anfds [fd].emask = 0; |
235 | anfds [fd].emask = 0; |
234 | } |
236 | } |
235 | } |
237 | } |
236 | } |
238 | } |
237 | |
239 | |
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240 | static int |
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241 | epoll_epoll_create (void) |
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242 | { |
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243 | int fd; |
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244 | |
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245 | #if defined EPOLL_CLOEXEC && !defined __ANDROID__ |
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246 | fd = epoll_create1 (EPOLL_CLOEXEC); |
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247 | |
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248 | if (fd < 0 && (errno == EINVAL || errno == ENOSYS)) |
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249 | #endif |
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250 | { |
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251 | fd = epoll_create (256); |
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252 | |
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253 | if (fd >= 0) |
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254 | fcntl (fd, F_SETFD, FD_CLOEXEC); |
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255 | } |
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256 | |
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257 | return fd; |
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258 | } |
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259 | |
238 | inline_size |
260 | inline_size |
239 | int |
261 | int |
240 | epoll_init (EV_P_ int flags) |
262 | epoll_init (EV_P_ int flags) |
241 | { |
263 | { |
242 | #ifdef EPOLL_CLOEXEC |
264 | if ((backend_fd = epoll_epoll_create ()) < 0) |
243 | backend_fd = epoll_create1 (EPOLL_CLOEXEC); |
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244 | |
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245 | if (backend_fd < 0 && (errno == EINVAL || errno == ENOSYS)) |
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246 | #endif |
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247 | backend_fd = epoll_create (256); |
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248 | |
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249 | if (backend_fd < 0) |
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250 | return 0; |
265 | return 0; |
251 | |
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252 | fcntl (backend_fd, F_SETFD, FD_CLOEXEC); |
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253 | |
266 | |
254 | backend_mintime = 1e-3; /* epoll does sometimes return early, this is just to avoid the worst */ |
267 | backend_mintime = 1e-3; /* epoll does sometimes return early, this is just to avoid the worst */ |
255 | backend_modify = epoll_modify; |
268 | backend_modify = epoll_modify; |
256 | backend_poll = epoll_poll; |
269 | backend_poll = epoll_poll; |
257 | |
270 | |
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273 | void |
286 | void |
274 | epoll_fork (EV_P) |
287 | epoll_fork (EV_P) |
275 | { |
288 | { |
276 | close (backend_fd); |
289 | close (backend_fd); |
277 | |
290 | |
278 | while ((backend_fd = epoll_create (256)) < 0) |
291 | while ((backend_fd = epoll_epoll_create ()) < 0) |
279 | ev_syserr ("(libev) epoll_create"); |
292 | ev_syserr ("(libev) epoll_create"); |
280 | |
293 | |
281 | fcntl (backend_fd, F_SETFD, FD_CLOEXEC); |
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282 | |
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283 | fd_rearm_all (EV_A); |
294 | fd_rearm_all (EV_A); |
284 | } |
295 | } |
285 | |
296 | |