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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 | |
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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; |
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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 | |
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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 |
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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 |
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197 | * but we closed it). |
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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. */ |