| 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 | * |
| … | |
… | |
| 70 | if (oev == nev) |
70 | if (oev == nev) |
| 71 | return; |
71 | return; |
| 72 | |
72 | |
| 73 | { |
73 | { |
| 74 | #if EV_SELECT_USE_FD_SET |
74 | #if EV_SELECT_USE_FD_SET |
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|
75 | assert (("libev: fd >= FD_SETSIZE passed to fd_set-based select backend", fd < FD_SETSIZE)); |
| 75 | |
76 | |
| 76 | #if EV_SELECT_IS_WINSOCKET |
77 | #if EV_SELECT_IS_WINSOCKET |
| 77 | SOCKET handle = anfds [fd].handle; |
78 | SOCKET handle = anfds [fd].handle; |
| 78 | #else |
79 | #else |
| 79 | int handle = fd; |
80 | int handle = fd; |
| … | |
… | |
| 156 | * errors to be reported as an exception and not by setting |
157 | * errors to be reported as an exception and not by setting |
| 157 | * the writable bit. this is so uncontrollably lame. |
158 | * the writable bit. this is so uncontrollably lame. |
| 158 | */ |
159 | */ |
| 159 | memcpy (vec_eo, vec_wi, fd_setsize); |
160 | 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); |
161 | res = select (vec_max * NFDBITS, (fd_set *)vec_ro, (fd_set *)vec_wo, (fd_set *)vec_eo, &tv); |
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|
162 | #elif EV_SELECT_USE_FD_SET |
|
|
163 | fd_setsize = anfdmax < FD_SETSIZE ? anfdmax : FD_SETSIZE; |
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|
164 | res = select (fd_setsize, (fd_set *)vec_ro, (fd_set *)vec_wo, 0, &tv); |
| 161 | #else |
165 | #else |
| 162 | res = select (vec_max * NFDBITS, (fd_set *)vec_ro, (fd_set *)vec_wo, 0, &tv); |
166 | res = select (vec_max * NFDBITS, (fd_set *)vec_ro, (fd_set *)vec_wo, 0, &tv); |
| 163 | #endif |
167 | #endif |
| 164 | |
168 | |
| 165 | if (expect_false (res < 0)) |
169 | if (expect_false (res < 0)) |
| … | |
… | |
| 177 | #endif |
181 | #endif |
| 178 | |
182 | |
| 179 | #ifdef _WIN32 |
183 | #ifdef _WIN32 |
| 180 | /* select on windows errornously returns EINVAL when no fd sets have been |
184 | /* select on windows errornously returns EINVAL when no fd sets have been |
| 181 | * provided (this is documented). what microsoft doesn't tell you that this bug |
185 | * 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 |
186 | * exists even when the fd sets _are_ provided, so we have to check for this bug |
| 183 | * here and emulate by sleeping manually. |
187 | * here and emulate by sleeping manually. |
| 184 | * we also get EINVAL when the timeout is invalid, but we ignore this case here |
188 | * 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. |
189 | * and assume that EINVAL always means: you have to wait manually. |
| 186 | */ |
190 | */ |
| 187 | if (errno == EINVAL) |
191 | if (errno == EINVAL) |
| … | |
… | |
| 194 | if (errno == EBADF) |
198 | if (errno == EBADF) |
| 195 | fd_ebadf (EV_A); |
199 | fd_ebadf (EV_A); |
| 196 | else if (errno == ENOMEM && !syserr_cb) |
200 | else if (errno == ENOMEM && !syserr_cb) |
| 197 | fd_enomem (EV_A); |
201 | fd_enomem (EV_A); |
| 198 | else if (errno != EINTR) |
202 | else if (errno != EINTR) |
| 199 | syserr ("(libev) select"); |
203 | ev_syserr ("(libev) select"); |
| 200 | |
204 | |
| 201 | return; |
205 | return; |
| 202 | } |
206 | } |
| 203 | |
207 | |
| 204 | #if EV_SELECT_USE_FD_SET |
208 | #if EV_SELECT_USE_FD_SET |
| … | |
… | |
| 263 | backend_fudge = 0.; /* posix says this is zero */ |
267 | backend_fudge = 0.; /* posix says this is zero */ |
| 264 | backend_modify = select_modify; |
268 | backend_modify = select_modify; |
| 265 | backend_poll = select_poll; |
269 | backend_poll = select_poll; |
| 266 | |
270 | |
| 267 | #if EV_SELECT_USE_FD_SET |
271 | #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); |
272 | vec_ri = ev_malloc (sizeof (fd_set)); FD_ZERO ((fd_set *)vec_ri); |
| 270 | vec_ro = ev_malloc (sizeof (fd_set)); |
273 | vec_ro = ev_malloc (sizeof (fd_set)); |
| 271 | vec_wi = ev_malloc (sizeof (fd_set)); FD_ZERO ((fd_set *)vec_wi); |
274 | vec_wi = ev_malloc (sizeof (fd_set)); FD_ZERO ((fd_set *)vec_wi); |
| 272 | vec_wo = ev_malloc (sizeof (fd_set)); |
275 | vec_wo = ev_malloc (sizeof (fd_set)); |
| 273 | #ifdef _WIN32 |
276 | #ifdef _WIN32 |
