| … | |
… | |
| 168 | int fd = (uint32_t)ev->data.u64; /* mask out the lower 32 bits */ |
168 | int fd = (uint32_t)ev->data.u64; /* mask out the lower 32 bits */ |
| 169 | int want = anfds [fd].events; |
169 | int want = anfds [fd].events; |
| 170 | int got = (ev->events & (EPOLLOUT | EPOLLERR | EPOLLHUP) ? EV_WRITE : 0) |
170 | int got = (ev->events & (EPOLLOUT | EPOLLERR | EPOLLHUP) ? EV_WRITE : 0) |
| 171 | | (ev->events & (EPOLLIN | EPOLLERR | EPOLLHUP) ? EV_READ : 0); |
171 | | (ev->events & (EPOLLIN | EPOLLERR | EPOLLHUP) ? EV_READ : 0); |
| 172 | |
172 | |
|
|
173 | /* |
| 173 | /* check for spurious notification */ |
174 | * check for spurious notification. |
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175 | * this only finds spurious notifications on egen updates |
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176 | * other spurious notifications will be found by epoll_ctl, below |
| 174 | /* we assume that fd is always in range, as we never shrink the anfds array */ |
177 | * we assume that fd is always in range, as we never shrink the anfds array |
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|
178 | */ |
| 175 | if (expect_false ((uint32_t)anfds [fd].egen != (uint32_t)(ev->data.u64 >> 32))) |
179 | if (expect_false ((uint32_t)anfds [fd].egen != (uint32_t)(ev->data.u64 >> 32))) |
| 176 | { |
180 | { |
| 177 | /* recreate kernel state */ |
181 | /* recreate kernel state */ |
| 178 | postfork = 1; |
182 | postfork = 1; |
| 179 | continue; |
183 | continue; |
| … | |
… | |
| 181 | |
185 | |
| 182 | if (expect_false (got & ~want)) |
186 | if (expect_false (got & ~want)) |
| 183 | { |
187 | { |
| 184 | anfds [fd].emask = want; |
188 | anfds [fd].emask = want; |
| 185 | |
189 | |
|
|
190 | /* |
| 186 | /* we received an event but are not interested in it, try mod or del */ |
191 | * we received an event but are not interested in it, try mod or del |
| 187 | /* I don't think we ever need MOD, but let's handle it anyways */ |
192 | * this often happens because we optimistically do not unregister fds |
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193 | * when we are no longer interested in them, but also when we get spurious |
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|
194 | * notifications for fds from another process. this is partially handled |
|
|
195 | * above with the gencounter check (== our fd is not the event fd), and |
|
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196 | * partially here, when epoll_ctl returns an error (== a child has the fd |
|
|
197 | * but we closed it). |
|
|
198 | */ |
| 188 | ev->events = (want & EV_READ ? EPOLLIN : 0) |
199 | ev->events = (want & EV_READ ? EPOLLIN : 0) |
| 189 | | (want & EV_WRITE ? EPOLLOUT : 0); |
200 | | (want & EV_WRITE ? EPOLLOUT : 0); |
| 190 | |
201 | |
| 191 | /* pre-2.6.9 kernels require a non-null pointer with EPOLL_CTL_DEL, */ |
202 | /* pre-2.6.9 kernels require a non-null pointer with EPOLL_CTL_DEL, */ |
| 192 | /* which is fortunately easy to do for us. */ |
203 | /* which is fortunately easy to do for us. */ |
