1 | /* |
1 | /* |
2 | * libev select fd activity backend |
2 | * libev select fd activity backend |
3 | * |
3 | * |
4 | * Copyright (c) 2007 Marc Alexander Lehmann <libev@schmorp.de> |
4 | * Copyright (c) 2007,2008,2009,2010 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 | * |
… | |
… | |
37 | * either the BSD or the GPL. |
37 | * either the BSD or the GPL. |
38 | */ |
38 | */ |
39 | |
39 | |
40 | #ifndef _WIN32 |
40 | #ifndef _WIN32 |
41 | /* for unix systems */ |
41 | /* for unix systems */ |
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42 | # include <inttypes.h> |
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43 | # ifndef __hpux |
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44 | /* for REAL unix systems */ |
42 | # include <sys/select.h> |
45 | # include <sys/select.h> |
43 | # include <inttypes.h> |
46 | # endif |
44 | #endif |
47 | #endif |
45 | |
48 | |
46 | #ifndef EV_SELECT_USE_FD_SET |
49 | #ifndef EV_SELECT_USE_FD_SET |
47 | # ifdef NFDBITS |
50 | # ifdef NFDBITS |
48 | # define EV_SELECT_USE_FD_SET 0 |
51 | # define EV_SELECT_USE_FD_SET 0 |
… | |
… | |
52 | #endif |
55 | #endif |
53 | |
56 | |
54 | #if EV_SELECT_IS_WINSOCKET |
57 | #if EV_SELECT_IS_WINSOCKET |
55 | # undef EV_SELECT_USE_FD_SET |
58 | # undef EV_SELECT_USE_FD_SET |
56 | # define EV_SELECT_USE_FD_SET 1 |
59 | # define EV_SELECT_USE_FD_SET 1 |
57 | # undef EINTR |
60 | # undef NFDBITS |
58 | # define EINTR WSAEINTR |
61 | # define NFDBITS 0 |
59 | # undef EBADF |
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60 | # define EBADF WSAENOTSOCK |
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61 | # undef ENOMEM |
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62 | # define ENOMEM (errno + 1) |
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63 | #endif |
62 | #endif |
64 | |
63 | |
65 | #if !EV_SELECT_USE_FD_SET |
64 | #if !EV_SELECT_USE_FD_SET |
66 | # define NFDBYTES (NFDBITS / 8) |
65 | # define NFDBYTES (NFDBITS / 8) |
67 | #endif |
66 | #endif |
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81 | SOCKET handle = anfds [fd].handle; |
80 | SOCKET handle = anfds [fd].handle; |
82 | #else |
81 | #else |
83 | int handle = fd; |
82 | int handle = fd; |
84 | #endif |
83 | #endif |
85 | |
84 | |
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85 | assert (("libev: fd >= FD_SETSIZE passed to fd_set-based select backend", fd < FD_SETSIZE)); |
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86 | |
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87 | /* FD_SET is broken on windows (it adds the fd to a set twice or more, |
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88 | * which eventually leads to overflows). Need to call it only on changes. |
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89 | */ |
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90 | #if EV_SELECT_IS_WINSOCKET |
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91 | if ((oev ^ nev) & EV_READ) |
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92 | #endif |
86 | if (nev & EV_READ) |
93 | if (nev & EV_READ) |
87 | FD_SET (handle, (fd_set *)vec_ri); |
94 | FD_SET (handle, (fd_set *)vec_ri); |
88 | else |
95 | else |
89 | FD_CLR (handle, (fd_set *)vec_ri); |
96 | FD_CLR (handle, (fd_set *)vec_ri); |
90 | |
97 | |
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98 | #if EV_SELECT_IS_WINSOCKET |
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99 | if ((oev ^ nev) & EV_WRITE) |
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100 | #endif |
91 | if (nev & EV_WRITE) |
101 | if (nev & EV_WRITE) |
92 | FD_SET (handle, (fd_set *)vec_wi); |
102 | FD_SET (handle, (fd_set *)vec_wi); |
93 | else |
103 | else |
94 | FD_CLR (handle, (fd_set *)vec_wi); |
104 | FD_CLR (handle, (fd_set *)vec_wi); |
95 | |
105 | |
96 | #else |
106 | #else |
97 | |
107 | |
98 | int word = fd / NFDBITS; |
108 | int word = fd / NFDBITS; |
99 | fd_mask mask = 1UL << (fd % NFDBITS); |
109 | fd_mask mask = 1UL << (fd % NFDBITS); |
… | |
… | |
104 | |
114 | |
105 | vec_ri = ev_realloc (vec_ri, new_max * NFDBYTES); |
115 | vec_ri = ev_realloc (vec_ri, new_max * NFDBYTES); |
106 | vec_ro = ev_realloc (vec_ro, new_max * NFDBYTES); /* could free/malloc */ |
116 | vec_ro = ev_realloc (vec_ro, new_max * NFDBYTES); /* could free/malloc */ |
107 | vec_wi = ev_realloc (vec_wi, new_max * NFDBYTES); |
117 | vec_wi = ev_realloc (vec_wi, new_max * NFDBYTES); |
108 | vec_wo = ev_realloc (vec_wo, new_max * NFDBYTES); /* could free/malloc */ |
118 | vec_wo = ev_realloc (vec_wo, new_max * NFDBYTES); /* could free/malloc */ |
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119 | #ifdef _WIN32 |
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120 | vec_eo = ev_realloc (vec_eo, new_max * NFDBYTES); /* could free/malloc */ |
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121 | #endif |
109 | |
122 | |
110 | for (; vec_max < new_max; ++vec_max) |
123 | for (; vec_max < new_max; ++vec_max) |
111 | ((fd_mask *)vec_ri) [vec_max] = |
124 | ((fd_mask *)vec_ri) [vec_max] = |
112 | ((fd_mask *)vec_wi) [vec_max] = 0; |
125 | ((fd_mask *)vec_wi) [vec_max] = 0; |
113 | } |
126 | } |
… | |
… | |
126 | static void |
139 | static void |
127 | select_poll (EV_P_ ev_tstamp timeout) |
140 | select_poll (EV_P_ ev_tstamp timeout) |
128 | { |
141 | { |
129 | struct timeval tv; |
142 | struct timeval tv; |
130 | int res; |
143 | int res; |
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144 | int fd_setsize; |
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145 | |
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146 | EV_RELEASE_CB; |
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147 | EV_TV_SET (tv, timeout); |
131 | |
148 | |
132 | #if EV_SELECT_USE_FD_SET |
149 | #if EV_SELECT_USE_FD_SET |
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150 | fd_setsize = sizeof (fd_set); |
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151 | #else |
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152 | fd_setsize = vec_max * NFDBYTES; |
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153 | #endif |
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154 | |
133 | memcpy (vec_ro, vec_ri, sizeof (fd_set)); |
155 | memcpy (vec_ro, vec_ri, fd_setsize); |
134 | memcpy (vec_wo, vec_wi, sizeof (fd_set)); |
156 | memcpy (vec_wo, vec_wi, fd_setsize); |
135 | #else |
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136 | memcpy (vec_ro, vec_ri, vec_max * NFDBYTES); |
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137 | memcpy (vec_wo, vec_wi, vec_max * NFDBYTES); |
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138 | #endif |
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139 | |
157 | |
140 | tv.tv_sec = (long)timeout; |
158 | #ifdef _WIN32 |
141 | tv.tv_usec = (long)((timeout - (ev_tstamp)tv.tv_sec) * 1e6); |
159 | /* pass in the write set as except set. |
142 | |
160 | * the idea behind this is to work around a windows bug that causes |
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161 | * errors to be reported as an exception and not by setting |
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162 | * the writable bit. this is so uncontrollably lame. |
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163 | */ |
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164 | memcpy (vec_eo, vec_wi, fd_setsize); |
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165 | res = select (vec_max * NFDBITS, (fd_set *)vec_ro, (fd_set *)vec_wo, (fd_set *)vec_eo, &tv); |
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166 | #elif EV_SELECT_USE_FD_SET |
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167 | fd_setsize = anfdmax < FD_SETSIZE ? anfdmax : FD_SETSIZE; |
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168 | res = select (fd_setsize, (fd_set *)vec_ro, (fd_set *)vec_wo, 0, &tv); |
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169 | #else |
143 | res = select (vec_max * NFDBITS, (fd_set *)vec_ro, (fd_set *)vec_wo, 0, &tv); |
170 | res = select (vec_max * NFDBITS, (fd_set *)vec_ro, (fd_set *)vec_wo, 0, &tv); |
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171 | #endif |
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172 | EV_ACQUIRE_CB; |
144 | |
173 | |
145 | if (expect_false (res < 0)) |
174 | if (expect_false (res < 0)) |
146 | { |
175 | { |
147 | #if EV_SELECT_IS_WINSOCKET |
176 | #if EV_SELECT_IS_WINSOCKET |
148 | errno = WSAGetLastError (); |
177 | errno = WSAGetLastError (); |
… | |
… | |
155 | else |
184 | else |
156 | errno -= WSABASEERR; |
185 | errno -= WSABASEERR; |
157 | #endif |
186 | #endif |
158 | |
187 | |
159 | #ifdef _WIN32 |
188 | #ifdef _WIN32 |
160 | /* select on windows errornously returns EINVAL when no fd sets have been |
189 | /* select on windows erroneously returns EINVAL when no fd sets have been |
161 | * provided (this is documented). what microsoft doesn't tell you that this bug |
190 | * provided (this is documented). what microsoft doesn't tell you that this bug |
162 | * exists even when the fd sets are provided, so we have to check for this bug |
191 | * exists even when the fd sets _are_ provided, so we have to check for this bug |
163 | * here and emulate by sleeping manually. |
192 | * here and emulate by sleeping manually. |
164 | * we also get EINVAL when the timeout is invalid, but we ignore this case here |
193 | * we also get EINVAL when the timeout is invalid, but we ignore this case here |
165 | * and assume that EINVAL always means: you have to wait manually. |
194 | * and assume that EINVAL always means: you have to wait manually. |
166 | */ |
195 | */ |
167 | if (errno == EINVAL) |
196 | if (errno == EINVAL) |
… | |
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174 | if (errno == EBADF) |
203 | if (errno == EBADF) |
175 | fd_ebadf (EV_A); |
204 | fd_ebadf (EV_A); |
176 | else if (errno == ENOMEM && !syserr_cb) |
205 | else if (errno == ENOMEM && !syserr_cb) |
177 | fd_enomem (EV_A); |
206 | fd_enomem (EV_A); |
178 | else if (errno != EINTR) |
207 | else if (errno != EINTR) |
179 | syserr ("(libev) select"); |
208 | ev_syserr ("(libev) select"); |
180 | |
209 | |
181 | return; |
210 | return; |
182 | } |
211 | } |
183 | |
212 | |
184 | #if EV_SELECT_USE_FD_SET |
213 | #if EV_SELECT_USE_FD_SET |
… | |
… | |
196 | int handle = fd; |
225 | int handle = fd; |
197 | #endif |
226 | #endif |
198 | |
227 | |
199 | if (FD_ISSET (handle, (fd_set *)vec_ro)) events |= EV_READ; |
228 | if (FD_ISSET (handle, (fd_set *)vec_ro)) events |= EV_READ; |
200 | if (FD_ISSET (handle, (fd_set *)vec_wo)) events |= EV_WRITE; |
229 | if (FD_ISSET (handle, (fd_set *)vec_wo)) events |= EV_WRITE; |
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230 | #ifdef _WIN32 |
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231 | if (FD_ISSET (handle, (fd_set *)vec_eo)) events |= EV_WRITE; |
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232 | #endif |
201 | |
233 | |
202 | if (expect_true (events)) |
234 | if (expect_true (events)) |
203 | fd_event (EV_A_ fd, events); |
235 | fd_event (EV_A_ fd, events); |
204 | } |
236 | } |
205 | } |
237 | } |
… | |
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210 | int word, bit; |
242 | int word, bit; |
211 | for (word = vec_max; word--; ) |
243 | for (word = vec_max; word--; ) |
212 | { |
244 | { |
213 | fd_mask word_r = ((fd_mask *)vec_ro) [word]; |
245 | fd_mask word_r = ((fd_mask *)vec_ro) [word]; |
214 | fd_mask word_w = ((fd_mask *)vec_wo) [word]; |
246 | fd_mask word_w = ((fd_mask *)vec_wo) [word]; |
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247 | #ifdef _WIN32 |
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248 | word_w |= ((fd_mask *)vec_eo) [word]; |
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249 | #endif |
215 | |
250 | |
216 | if (word_r || word_w) |
251 | if (word_r || word_w) |
217 | for (bit = NFDBITS; bit--; ) |
252 | for (bit = NFDBITS; bit--; ) |
218 | { |
253 | { |
219 | fd_mask mask = 1UL << bit; |
254 | fd_mask mask = 1UL << bit; |
… | |
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237 | backend_fudge = 0.; /* posix says this is zero */ |
272 | backend_fudge = 0.; /* posix says this is zero */ |
238 | backend_modify = select_modify; |
273 | backend_modify = select_modify; |
239 | backend_poll = select_poll; |
274 | backend_poll = select_poll; |
240 | |
275 | |
241 | #if EV_SELECT_USE_FD_SET |
276 | #if EV_SELECT_USE_FD_SET |
242 | vec_max = FD_SETSIZE / 32; |
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243 | vec_ri = ev_malloc (sizeof (fd_set)); FD_ZERO ((fd_set *)vec_ri); |
277 | vec_ri = ev_malloc (sizeof (fd_set)); FD_ZERO ((fd_set *)vec_ri); |
244 | vec_ro = ev_malloc (sizeof (fd_set)); |
278 | vec_ro = ev_malloc (sizeof (fd_set)); |
245 | vec_wi = ev_malloc (sizeof (fd_set)); FD_ZERO ((fd_set *)vec_wi); |
279 | vec_wi = ev_malloc (sizeof (fd_set)); FD_ZERO ((fd_set *)vec_wi); |
246 | vec_wo = ev_malloc (sizeof (fd_set)); |
280 | vec_wo = ev_malloc (sizeof (fd_set)); |
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281 | #ifdef _WIN32 |
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282 | vec_eo = ev_malloc (sizeof (fd_set)); |
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283 | #endif |
247 | #else |
284 | #else |
248 | vec_max = 0; |
285 | vec_max = 0; |
249 | vec_ri = 0; |
286 | vec_ri = 0; |
250 | vec_ri = 0; |
287 | vec_ro = 0; |
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288 | vec_wi = 0; |
251 | vec_wo = 0; |
289 | vec_wo = 0; |
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290 | #ifdef _WIN32 |
252 | vec_wo = 0; |
291 | vec_eo = 0; |
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292 | #endif |
253 | #endif |
293 | #endif |
254 | |
294 | |
255 | return EVBACKEND_SELECT; |
295 | return EVBACKEND_SELECT; |
256 | } |
296 | } |
257 | |
297 | |
… | |
… | |
260 | { |
300 | { |
261 | ev_free (vec_ri); |
301 | ev_free (vec_ri); |
262 | ev_free (vec_ro); |
302 | ev_free (vec_ro); |
263 | ev_free (vec_wi); |
303 | ev_free (vec_wi); |
264 | ev_free (vec_wo); |
304 | ev_free (vec_wo); |
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305 | #ifdef _WIN32 |
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306 | ev_free (vec_eo); |
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307 | #endif |
265 | } |
308 | } |
266 | |
309 | |
267 | |
310 | |