1 | /* |
1 | /* |
2 | * libev select fd activity backend |
2 | * libev select fd activity backend |
3 | * |
3 | * |
4 | * Copyright (c) 2007,2008,2009 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 |
… | |
… | |
70 | if (oev == nev) |
73 | if (oev == nev) |
71 | return; |
74 | return; |
72 | |
75 | |
73 | { |
76 | { |
74 | #if EV_SELECT_USE_FD_SET |
77 | #if EV_SELECT_USE_FD_SET |
75 | assert (("libev: fd >= FD_SETSIZE passed to fd_set-based select backend", fd < FD_SETSIZE)); |
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76 | |
78 | |
77 | #if EV_SELECT_IS_WINSOCKET |
79 | #if EV_SELECT_IS_WINSOCKET |
78 | SOCKET handle = anfds [fd].handle; |
80 | SOCKET handle = anfds [fd].handle; |
79 | #else |
81 | #else |
80 | int handle = fd; |
82 | int handle = fd; |
81 | #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)); |
82 | |
86 | |
83 | /* 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, |
84 | * 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. |
85 | */ |
89 | */ |
86 | #if EV_SELECT_IS_WINSOCKET |
90 | #if EV_SELECT_IS_WINSOCKET |
… | |
… | |
137 | { |
141 | { |
138 | struct timeval tv; |
142 | struct timeval tv; |
139 | int res; |
143 | int res; |
140 | int fd_setsize; |
144 | int fd_setsize; |
141 | |
145 | |
142 | tv.tv_sec = (long)timeout; |
146 | EV_RELEASE_CB; |
143 | tv.tv_usec = (long)((timeout - (ev_tstamp)tv.tv_sec) * 1e6); |
147 | EV_TV_SET (tv, timeout); |
144 | |
148 | |
145 | #if EV_SELECT_USE_FD_SET |
149 | #if EV_SELECT_USE_FD_SET |
146 | fd_setsize = sizeof (fd_set); |
150 | fd_setsize = sizeof (fd_set); |
147 | #else |
151 | #else |
148 | fd_setsize = vec_max * NFDBYTES; |
152 | fd_setsize = vec_max * NFDBYTES; |
… | |
… | |
163 | fd_setsize = anfdmax < FD_SETSIZE ? anfdmax : FD_SETSIZE; |
167 | fd_setsize = anfdmax < FD_SETSIZE ? anfdmax : FD_SETSIZE; |
164 | res = select (fd_setsize, (fd_set *)vec_ro, (fd_set *)vec_wo, 0, &tv); |
168 | res = select (fd_setsize, (fd_set *)vec_ro, (fd_set *)vec_wo, 0, &tv); |
165 | #else |
169 | #else |
166 | 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); |
167 | #endif |
171 | #endif |
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172 | EV_ACQUIRE_CB; |
168 | |
173 | |
169 | if (expect_false (res < 0)) |
174 | if (expect_false (res < 0)) |
170 | { |
175 | { |
171 | #if EV_SELECT_IS_WINSOCKET |
176 | #if EV_SELECT_IS_WINSOCKET |
172 | errno = WSAGetLastError (); |
177 | errno = WSAGetLastError (); |
… | |
… | |
179 | else |
184 | else |
180 | errno -= WSABASEERR; |
185 | errno -= WSABASEERR; |
181 | #endif |
186 | #endif |
182 | |
187 | |
183 | #ifdef _WIN32 |
188 | #ifdef _WIN32 |
184 | /* 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 |
185 | * 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 |
186 | * 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 |
187 | * here and emulate by sleeping manually. |
192 | * here and emulate by sleeping manually. |
188 | * 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 |
189 | * and assume that EINVAL always means: you have to wait manually. |
194 | * and assume that EINVAL always means: you have to wait manually. |
… | |
… | |
277 | vec_eo = ev_malloc (sizeof (fd_set)); |
282 | vec_eo = ev_malloc (sizeof (fd_set)); |
278 | #endif |
283 | #endif |
279 | #else |
284 | #else |
280 | vec_max = 0; |
285 | vec_max = 0; |
281 | vec_ri = 0; |
286 | vec_ri = 0; |
282 | vec_ri = 0; |
287 | vec_ro = 0; |
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288 | vec_wi = 0; |
283 | vec_wo = 0; |
289 | vec_wo = 0; |
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290 | #ifdef _WIN32 |
284 | vec_wo = 0; |
291 | vec_eo = 0; |
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292 | #endif |
285 | #endif |
293 | #endif |
286 | |
294 | |
287 | return EVBACKEND_SELECT; |
295 | return EVBACKEND_SELECT; |
288 | } |
296 | } |
289 | |
297 | |
… | |
… | |
292 | { |
300 | { |
293 | ev_free (vec_ri); |
301 | ev_free (vec_ri); |
294 | ev_free (vec_ro); |
302 | ev_free (vec_ro); |
295 | ev_free (vec_wi); |
303 | ev_free (vec_wi); |
296 | 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 |
297 | } |
308 | } |
298 | |
309 | |
299 | |
310 | |