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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177 | * we assume that fd is always in range, as we never shrink the anfds array |
179 | * we assume that fd is always in range, as we never shrink the anfds array |
178 | */ |
180 | */ |
179 | if (expect_false ((uint32_t)anfds [fd].egen != (uint32_t)(ev->data.u64 >> 32))) |
181 | if (expect_false ((uint32_t)anfds [fd].egen != (uint32_t)(ev->data.u64 >> 32))) |
180 | { |
182 | { |
181 | /* recreate kernel state */ |
183 | /* recreate kernel state */ |
182 | postfork = 1; |
184 | postfork |= 2; |
183 | continue; |
185 | continue; |
184 | } |
186 | } |
185 | |
187 | |
186 | if (expect_false (got & ~want)) |
188 | if (expect_false (got & ~want)) |
187 | { |
189 | { |
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201 | |
203 | |
202 | /* pre-2.6.9 kernels require a non-null pointer with EPOLL_CTL_DEL, */ |
204 | /* pre-2.6.9 kernels require a non-null pointer with EPOLL_CTL_DEL, */ |
203 | /* which is fortunately easy to do for us. */ |
205 | /* which is fortunately easy to do for us. */ |
204 | if (epoll_ctl (backend_fd, want ? EPOLL_CTL_MOD : EPOLL_CTL_DEL, fd, ev)) |
206 | if (epoll_ctl (backend_fd, want ? EPOLL_CTL_MOD : EPOLL_CTL_DEL, fd, ev)) |
205 | { |
207 | { |
206 | postfork = 1; /* an error occurred, recreate kernel state */ |
208 | postfork |= 2; /* an error occurred, recreate kernel state */ |
207 | continue; |
209 | continue; |
208 | } |
210 | } |
209 | } |
211 | } |
210 | |
212 | |
211 | fd_event (EV_A_ fd, got); |
213 | fd_event (EV_A_ fd, got); |
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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 | int inline_size |
260 | inline_size |
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261 | int |
239 | epoll_init (EV_P_ int flags) |
262 | epoll_init (EV_P_ int flags) |
240 | { |
263 | { |
241 | #ifdef EPOLL_CLOEXEC |
264 | if ((backend_fd = epoll_epoll_create ()) < 0) |
242 | backend_fd = epoll_create1 (EPOLL_CLOEXEC); |
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243 | |
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244 | if (backend_fd < 0 && (errno == EINVAL || errno == ENOSYS)) |
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245 | #endif |
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246 | backend_fd = epoll_create (256); |
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247 | |
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248 | if (backend_fd < 0) |
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249 | return 0; |
265 | return 0; |
250 | |
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251 | fcntl (backend_fd, F_SETFD, FD_CLOEXEC); |
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252 | |
266 | |
253 | 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 */ |
254 | backend_modify = epoll_modify; |
268 | backend_modify = epoll_modify; |
255 | backend_poll = epoll_poll; |
269 | backend_poll = epoll_poll; |
256 | |
270 | |
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258 | epoll_events = (struct epoll_event *)ev_malloc (sizeof (struct epoll_event) * epoll_eventmax); |
272 | epoll_events = (struct epoll_event *)ev_malloc (sizeof (struct epoll_event) * epoll_eventmax); |
259 | |
273 | |
260 | return EVBACKEND_EPOLL; |
274 | return EVBACKEND_EPOLL; |
261 | } |
275 | } |
262 | |
276 | |
263 | void inline_size |
277 | inline_size |
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278 | void |
264 | epoll_destroy (EV_P) |
279 | epoll_destroy (EV_P) |
265 | { |
280 | { |
266 | ev_free (epoll_events); |
281 | ev_free (epoll_events); |
267 | array_free (epoll_eperm, EMPTY); |
282 | array_free (epoll_eperm, EMPTY); |
268 | } |
283 | } |
269 | |
284 | |
270 | void inline_size |
285 | inline_size |
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286 | void |
271 | epoll_fork (EV_P) |
287 | epoll_fork (EV_P) |
272 | { |
288 | { |
273 | close (backend_fd); |
289 | close (backend_fd); |
274 | |
290 | |
275 | while ((backend_fd = epoll_create (256)) < 0) |
291 | while ((backend_fd = epoll_epoll_create ()) < 0) |
276 | ev_syserr ("(libev) epoll_create"); |
292 | ev_syserr ("(libev) epoll_create"); |
277 | |
293 | |
278 | fcntl (backend_fd, F_SETFD, FD_CLOEXEC); |
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279 | |
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280 | fd_rearm_all (EV_A); |
294 | fd_rearm_all (EV_A); |
281 | } |
295 | } |
282 | |
296 | |