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) 2007,2008,2009,2010 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 |
… | |
… | |
76 | #if EV_SELECT_IS_WINSOCKET |
79 | #if EV_SELECT_IS_WINSOCKET |
77 | SOCKET handle = anfds [fd].handle; |
80 | SOCKET handle = anfds [fd].handle; |
78 | #else |
81 | #else |
79 | int handle = fd; |
82 | int handle = fd; |
80 | #endif |
83 | #endif |
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84 | |
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85 | assert (("libev: fd >= FD_SETSIZE passed to fd_set-based select backend", fd < FD_SETSIZE)); |
81 | |
86 | |
82 | /* FD_SET is broken on windows (it adds the fd to a set twice or more, |
87 | /* FD_SET is broken on windows (it adds the fd to a set twice or more, |
83 | * which eventually leads to overflows). Need to call it only on changes. |
88 | * which eventually leads to overflows). Need to call it only on changes. |
84 | */ |
89 | */ |
85 | #if EV_SELECT_IS_WINSOCKET |
90 | #if EV_SELECT_IS_WINSOCKET |
… | |
… | |
136 | { |
141 | { |
137 | struct timeval tv; |
142 | struct timeval tv; |
138 | int res; |
143 | int res; |
139 | int fd_setsize; |
144 | int fd_setsize; |
140 | |
145 | |
141 | tv.tv_sec = (long)timeout; |
146 | EV_RELEASE_CB; |
142 | tv.tv_usec = (long)((timeout - (ev_tstamp)tv.tv_sec) * 1e6); |
147 | EV_TV_SET (tv, timeout); |
143 | |
148 | |
144 | #if EV_SELECT_USE_FD_SET |
149 | #if EV_SELECT_USE_FD_SET |
145 | fd_setsize = sizeof (fd_set); |
150 | fd_setsize = sizeof (fd_set); |
146 | #else |
151 | #else |
147 | fd_setsize = vec_max * NFDBYTES; |
152 | fd_setsize = vec_max * NFDBYTES; |
… | |
… | |
156 | * errors to be reported as an exception and not by setting |
161 | * errors to be reported as an exception and not by setting |
157 | * the writable bit. this is so uncontrollably lame. |
162 | * the writable bit. this is so uncontrollably lame. |
158 | */ |
163 | */ |
159 | memcpy (vec_eo, vec_wi, fd_setsize); |
164 | memcpy (vec_eo, vec_wi, fd_setsize); |
160 | res = select (vec_max * NFDBITS, (fd_set *)vec_ro, (fd_set *)vec_wo, (fd_set *)vec_eo, &tv); |
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); |
161 | #else |
169 | #else |
162 | 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); |
163 | #endif |
171 | #endif |
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172 | EV_ACQUIRE_CB; |
164 | |
173 | |
165 | if (expect_false (res < 0)) |
174 | if (expect_false (res < 0)) |
166 | { |
175 | { |
167 | #if EV_SELECT_IS_WINSOCKET |
176 | #if EV_SELECT_IS_WINSOCKET |
168 | errno = WSAGetLastError (); |
177 | errno = WSAGetLastError (); |
… | |
… | |
175 | else |
184 | else |
176 | errno -= WSABASEERR; |
185 | errno -= WSABASEERR; |
177 | #endif |
186 | #endif |
178 | |
187 | |
179 | #ifdef _WIN32 |
188 | #ifdef _WIN32 |
180 | /* 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 |
181 | * 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 |
182 | * 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 |
183 | * here and emulate by sleeping manually. |
192 | * here and emulate by sleeping manually. |
184 | * 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 |
185 | * and assume that EINVAL always means: you have to wait manually. |
194 | * and assume that EINVAL always means: you have to wait manually. |
… | |
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263 | backend_fudge = 0.; /* posix says this is zero */ |
272 | backend_fudge = 0.; /* posix says this is zero */ |
264 | backend_modify = select_modify; |
273 | backend_modify = select_modify; |
265 | backend_poll = select_poll; |
274 | backend_poll = select_poll; |
266 | |
275 | |
267 | #if EV_SELECT_USE_FD_SET |
276 | #if EV_SELECT_USE_FD_SET |
268 | vec_max = FD_SETSIZE / 32; |
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269 | 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); |
270 | vec_ro = ev_malloc (sizeof (fd_set)); |
278 | vec_ro = ev_malloc (sizeof (fd_set)); |
271 | 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); |
272 | vec_wo = ev_malloc (sizeof (fd_set)); |
280 | vec_wo = ev_malloc (sizeof (fd_set)); |
273 | #ifdef _WIN32 |
281 | #ifdef _WIN32 |
274 | vec_eo = ev_malloc (sizeof (fd_set)); |
282 | vec_eo = ev_malloc (sizeof (fd_set)); |
275 | #endif |
283 | #endif |
276 | #else |
284 | #else |
277 | vec_max = 0; |
285 | vec_max = 0; |
278 | vec_ri = 0; |
286 | vec_ri = 0; |
279 | vec_ri = 0; |
287 | vec_ro = 0; |
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288 | vec_wi = 0; |
280 | vec_wo = 0; |
289 | vec_wo = 0; |
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290 | #ifdef _WIN32 |
281 | vec_wo = 0; |
291 | vec_eo = 0; |
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292 | #endif |
282 | #endif |
293 | #endif |
283 | |
294 | |
284 | return EVBACKEND_SELECT; |
295 | return EVBACKEND_SELECT; |
285 | } |
296 | } |
286 | |
297 | |
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289 | { |
300 | { |
290 | ev_free (vec_ri); |
301 | ev_free (vec_ri); |
291 | ev_free (vec_ro); |
302 | ev_free (vec_ro); |
292 | ev_free (vec_wi); |
303 | ev_free (vec_wi); |
293 | 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 |
294 | } |
308 | } |
295 | |
309 | |
296 | |
310 | |