1 | /* |
1 | /* |
2 | * libev select fd activity backend |
2 | * libev select fd activity backend |
3 | * |
3 | * |
4 | * Copyright (c) 2007,2008 Marc Alexander Lehmann <libev@schmorp.de> |
4 | * Copyright (c) 2007,2008,2009 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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… | |
52 | #endif |
52 | #endif |
53 | |
53 | |
54 | #if EV_SELECT_IS_WINSOCKET |
54 | #if EV_SELECT_IS_WINSOCKET |
55 | # undef EV_SELECT_USE_FD_SET |
55 | # undef EV_SELECT_USE_FD_SET |
56 | # define EV_SELECT_USE_FD_SET 1 |
56 | # define EV_SELECT_USE_FD_SET 1 |
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57 | # undef NFDBITS |
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58 | # define NFDBITS 0 |
57 | #endif |
59 | #endif |
58 | |
60 | |
59 | #if !EV_SELECT_USE_FD_SET |
61 | #if !EV_SELECT_USE_FD_SET |
60 | # define NFDBYTES (NFDBITS / 8) |
62 | # define NFDBYTES (NFDBITS / 8) |
61 | #endif |
63 | #endif |
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75 | SOCKET handle = anfds [fd].handle; |
77 | SOCKET handle = anfds [fd].handle; |
76 | #else |
78 | #else |
77 | int handle = fd; |
79 | int handle = fd; |
78 | #endif |
80 | #endif |
79 | |
81 | |
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82 | assert (("libev: fd >= FD_SETSIZE passed to fd_set-based select backend", fd < FD_SETSIZE)); |
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83 | |
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84 | /* FD_SET is broken on windows (it adds the fd to a set twice or more, |
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85 | * which eventually leads to overflows). Need to call it only on changes. |
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86 | */ |
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87 | #if EV_SELECT_IS_WINSOCKET |
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88 | if ((oev ^ nev) & EV_READ) |
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89 | #endif |
80 | if (nev & EV_READ) |
90 | if (nev & EV_READ) |
81 | FD_SET (handle, (fd_set *)vec_ri); |
91 | FD_SET (handle, (fd_set *)vec_ri); |
82 | else |
92 | else |
83 | FD_CLR (handle, (fd_set *)vec_ri); |
93 | FD_CLR (handle, (fd_set *)vec_ri); |
84 | |
94 | |
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95 | #if EV_SELECT_IS_WINSOCKET |
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96 | if ((oev ^ nev) & EV_WRITE) |
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97 | #endif |
85 | if (nev & EV_WRITE) |
98 | if (nev & EV_WRITE) |
86 | FD_SET (handle, (fd_set *)vec_wi); |
99 | FD_SET (handle, (fd_set *)vec_wi); |
87 | else |
100 | else |
88 | FD_CLR (handle, (fd_set *)vec_wi); |
101 | FD_CLR (handle, (fd_set *)vec_wi); |
89 | |
102 | |
90 | #else |
103 | #else |
91 | |
104 | |
92 | int word = fd / NFDBITS; |
105 | int word = fd / NFDBITS; |
93 | fd_mask mask = 1UL << (fd % NFDBITS); |
106 | fd_mask mask = 1UL << (fd % NFDBITS); |
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98 | |
111 | |
99 | vec_ri = ev_realloc (vec_ri, new_max * NFDBYTES); |
112 | vec_ri = ev_realloc (vec_ri, new_max * NFDBYTES); |
100 | vec_ro = ev_realloc (vec_ro, new_max * NFDBYTES); /* could free/malloc */ |
113 | vec_ro = ev_realloc (vec_ro, new_max * NFDBYTES); /* could free/malloc */ |
101 | vec_wi = ev_realloc (vec_wi, new_max * NFDBYTES); |
114 | vec_wi = ev_realloc (vec_wi, new_max * NFDBYTES); |
102 | vec_wo = ev_realloc (vec_wo, new_max * NFDBYTES); /* could free/malloc */ |
115 | vec_wo = ev_realloc (vec_wo, new_max * NFDBYTES); /* could free/malloc */ |
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116 | #ifdef _WIN32 |
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117 | vec_eo = ev_realloc (vec_eo, new_max * NFDBYTES); /* could free/malloc */ |
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118 | #endif |
103 | |
119 | |
104 | for (; vec_max < new_max; ++vec_max) |
120 | for (; vec_max < new_max; ++vec_max) |
105 | ((fd_mask *)vec_ri) [vec_max] = |
121 | ((fd_mask *)vec_ri) [vec_max] = |
106 | ((fd_mask *)vec_wi) [vec_max] = 0; |
122 | ((fd_mask *)vec_wi) [vec_max] = 0; |
107 | } |
123 | } |
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120 | static void |
136 | static void |
121 | select_poll (EV_P_ ev_tstamp timeout) |
137 | select_poll (EV_P_ ev_tstamp timeout) |
122 | { |
138 | { |
123 | struct timeval tv; |
139 | struct timeval tv; |
124 | int res; |
140 | int res; |
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141 | int fd_setsize; |
125 | |
142 | |
126 | #if EV_SELECT_USE_FD_SET |
143 | if (expect_false (suspend_cb)) suspend_cb (EV_A); |
127 | memcpy (vec_ro, vec_ri, sizeof (fd_set)); |
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128 | memcpy (vec_wo, vec_wi, sizeof (fd_set)); |
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129 | #else |
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130 | memcpy (vec_ro, vec_ri, vec_max * NFDBYTES); |
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131 | memcpy (vec_wo, vec_wi, vec_max * NFDBYTES); |
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132 | #endif |
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133 | |
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134 | tv.tv_sec = (long)timeout; |
144 | tv.tv_sec = (long)timeout; |
135 | tv.tv_usec = (long)((timeout - (ev_tstamp)tv.tv_sec) * 1e6); |
145 | tv.tv_usec = (long)((timeout - (ev_tstamp)tv.tv_sec) * 1e6); |
136 | |
146 | |
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147 | #if EV_SELECT_USE_FD_SET |
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148 | fd_setsize = sizeof (fd_set); |
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149 | #else |
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150 | fd_setsize = vec_max * NFDBYTES; |
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151 | #endif |
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152 | |
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153 | memcpy (vec_ro, vec_ri, fd_setsize); |
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154 | memcpy (vec_wo, vec_wi, fd_setsize); |
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155 | |
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156 | #ifdef _WIN32 |
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157 | /* pass in the write set as except set. |
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158 | * the idea behind this is to work around a windows bug that causes |
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159 | * errors to be reported as an exception and not by setting |
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160 | * the writable bit. this is so uncontrollably lame. |
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161 | */ |
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162 | memcpy (vec_eo, vec_wi, fd_setsize); |
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163 | res = select (vec_max * NFDBITS, (fd_set *)vec_ro, (fd_set *)vec_wo, (fd_set *)vec_eo, &tv); |
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164 | #elif EV_SELECT_USE_FD_SET |
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165 | fd_setsize = anfdmax < FD_SETSIZE ? anfdmax : FD_SETSIZE; |
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166 | res = select (fd_setsize, (fd_set *)vec_ro, (fd_set *)vec_wo, 0, &tv); |
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167 | #else |
137 | res = select (vec_max * NFDBITS, (fd_set *)vec_ro, (fd_set *)vec_wo, 0, &tv); |
168 | res = select (vec_max * NFDBITS, (fd_set *)vec_ro, (fd_set *)vec_wo, 0, &tv); |
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169 | #endif |
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170 | if (expect_false (resume_cb)) resume_cb (EV_A); |
138 | |
171 | |
139 | if (expect_false (res < 0)) |
172 | if (expect_false (res < 0)) |
140 | { |
173 | { |
141 | #if EV_SELECT_IS_WINSOCKET |
174 | #if EV_SELECT_IS_WINSOCKET |
142 | errno = WSAGetLastError (); |
175 | errno = WSAGetLastError (); |
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151 | #endif |
184 | #endif |
152 | |
185 | |
153 | #ifdef _WIN32 |
186 | #ifdef _WIN32 |
154 | /* select on windows errornously returns EINVAL when no fd sets have been |
187 | /* select on windows errornously returns EINVAL when no fd sets have been |
155 | * provided (this is documented). what microsoft doesn't tell you that this bug |
188 | * provided (this is documented). what microsoft doesn't tell you that this bug |
156 | * exists even when the fd sets are provided, so we have to check for this bug |
189 | * exists even when the fd sets _are_ provided, so we have to check for this bug |
157 | * here and emulate by sleeping manually. |
190 | * here and emulate by sleeping manually. |
158 | * we also get EINVAL when the timeout is invalid, but we ignore this case here |
191 | * we also get EINVAL when the timeout is invalid, but we ignore this case here |
159 | * and assume that EINVAL always means: you have to wait manually. |
192 | * and assume that EINVAL always means: you have to wait manually. |
160 | */ |
193 | */ |
161 | if (errno == EINVAL) |
194 | if (errno == EINVAL) |
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168 | if (errno == EBADF) |
201 | if (errno == EBADF) |
169 | fd_ebadf (EV_A); |
202 | fd_ebadf (EV_A); |
170 | else if (errno == ENOMEM && !syserr_cb) |
203 | else if (errno == ENOMEM && !syserr_cb) |
171 | fd_enomem (EV_A); |
204 | fd_enomem (EV_A); |
172 | else if (errno != EINTR) |
205 | else if (errno != EINTR) |
173 | syserr ("(libev) select"); |
206 | ev_syserr ("(libev) select"); |
174 | |
207 | |
175 | return; |
208 | return; |
176 | } |
209 | } |
177 | |
210 | |
178 | #if EV_SELECT_USE_FD_SET |
211 | #if EV_SELECT_USE_FD_SET |
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190 | int handle = fd; |
223 | int handle = fd; |
191 | #endif |
224 | #endif |
192 | |
225 | |
193 | if (FD_ISSET (handle, (fd_set *)vec_ro)) events |= EV_READ; |
226 | if (FD_ISSET (handle, (fd_set *)vec_ro)) events |= EV_READ; |
194 | if (FD_ISSET (handle, (fd_set *)vec_wo)) events |= EV_WRITE; |
227 | if (FD_ISSET (handle, (fd_set *)vec_wo)) events |= EV_WRITE; |
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228 | #ifdef _WIN32 |
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229 | if (FD_ISSET (handle, (fd_set *)vec_eo)) events |= EV_WRITE; |
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230 | #endif |
195 | |
231 | |
196 | if (expect_true (events)) |
232 | if (expect_true (events)) |
197 | fd_event (EV_A_ fd, events); |
233 | fd_event (EV_A_ fd, events); |
198 | } |
234 | } |
199 | } |
235 | } |
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204 | int word, bit; |
240 | int word, bit; |
205 | for (word = vec_max; word--; ) |
241 | for (word = vec_max; word--; ) |
206 | { |
242 | { |
207 | fd_mask word_r = ((fd_mask *)vec_ro) [word]; |
243 | fd_mask word_r = ((fd_mask *)vec_ro) [word]; |
208 | fd_mask word_w = ((fd_mask *)vec_wo) [word]; |
244 | fd_mask word_w = ((fd_mask *)vec_wo) [word]; |
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245 | #ifdef _WIN32 |
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246 | word_w |= ((fd_mask *)vec_eo) [word]; |
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247 | #endif |
209 | |
248 | |
210 | if (word_r || word_w) |
249 | if (word_r || word_w) |
211 | for (bit = NFDBITS; bit--; ) |
250 | for (bit = NFDBITS; bit--; ) |
212 | { |
251 | { |
213 | fd_mask mask = 1UL << bit; |
252 | fd_mask mask = 1UL << bit; |
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231 | backend_fudge = 0.; /* posix says this is zero */ |
270 | backend_fudge = 0.; /* posix says this is zero */ |
232 | backend_modify = select_modify; |
271 | backend_modify = select_modify; |
233 | backend_poll = select_poll; |
272 | backend_poll = select_poll; |
234 | |
273 | |
235 | #if EV_SELECT_USE_FD_SET |
274 | #if EV_SELECT_USE_FD_SET |
236 | vec_max = FD_SETSIZE / 32; |
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237 | vec_ri = ev_malloc (sizeof (fd_set)); FD_ZERO ((fd_set *)vec_ri); |
275 | vec_ri = ev_malloc (sizeof (fd_set)); FD_ZERO ((fd_set *)vec_ri); |
238 | vec_ro = ev_malloc (sizeof (fd_set)); |
276 | vec_ro = ev_malloc (sizeof (fd_set)); |
239 | vec_wi = ev_malloc (sizeof (fd_set)); FD_ZERO ((fd_set *)vec_wi); |
277 | vec_wi = ev_malloc (sizeof (fd_set)); FD_ZERO ((fd_set *)vec_wi); |
240 | vec_wo = ev_malloc (sizeof (fd_set)); |
278 | vec_wo = ev_malloc (sizeof (fd_set)); |
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279 | #ifdef _WIN32 |
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280 | vec_eo = ev_malloc (sizeof (fd_set)); |
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281 | #endif |
241 | #else |
282 | #else |
242 | vec_max = 0; |
283 | vec_max = 0; |
243 | vec_ri = 0; |
284 | vec_ri = 0; |
244 | vec_ri = 0; |
285 | vec_ri = 0; |
245 | vec_wo = 0; |
286 | vec_wo = 0; |