| /* |
| Copyright (c) 2012 Martin Sustrik All rights reserved. |
| |
| Permission is hereby granted, free of charge, to any person obtaining a copy |
| of this software and associated documentation files (the "Software"), |
| to deal in the Software without restriction, including without limitation |
| the rights to use, copy, modify, merge, publish, distribute, sublicense, |
| and/or sell copies of the Software, and to permit persons to whom |
| the Software is furnished to do so, subject to the following conditions: |
| |
| The above copyright notice and this permission notice shall be included |
| in all copies or substantial portions of the Software. |
| |
| THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
| THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
| LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING |
| FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS |
| IN THE SOFTWARE. |
| */ |
| |
| #include "../utils/fast.h" |
| #include "../utils/err.h" |
| #include "../utils/closefd.h" |
| |
| #include <string.h> |
| #include <unistd.h> |
| #include <fcntl.h> |
| |
| int nn_poller_init (struct nn_poller *self) |
| { |
| #ifndef EPOLL_CLOEXEC |
| int rc; |
| #endif |
| |
| #ifdef EPOLL_CLOEXEC |
| self->ep = epoll_create1 (EPOLL_CLOEXEC); |
| #else |
| /* Size parameter is unused, we can safely set it to 1. */ |
| self->ep = epoll_create (1); |
| rc = fcntl (self->ep, F_SETFD, FD_CLOEXEC); |
| errno_assert (rc != -1); |
| #endif |
| if (self->ep == -1) { |
| if (errno == ENFILE || errno == EMFILE) |
| return -EMFILE; |
| errno_assert (0); |
| } |
| self->nevents = 0; |
| self->index = 0; |
| |
| return 0; |
| } |
| |
| void nn_poller_term (struct nn_poller *self) |
| { |
| nn_closefd (self->ep); |
| } |
| |
| void nn_poller_add (struct nn_poller *self, int fd, |
| struct nn_poller_hndl *hndl) |
| { |
| int rc; |
| struct epoll_event ev; |
| |
| /* Initialise the handle and add the file descriptor to the pollset. */ |
| hndl->fd = fd; |
| hndl->events = 0; |
| memset (&ev, 0, sizeof (ev)); |
| ev.events = 0; |
| ev.data.ptr = (void*) hndl; |
| epoll_ctl (self->ep, EPOLL_CTL_ADD, fd, &ev); |
| } |
| |
| void nn_poller_rm (struct nn_poller *self, struct nn_poller_hndl *hndl) |
| { |
| int i; |
| |
| /* Remove the file descriptor from the pollset. */ |
| epoll_ctl (self->ep, EPOLL_CTL_DEL, hndl->fd, NULL); |
| |
| /* Invalidate any subsequent events on this file descriptor. */ |
| for (i = self->index; i != self->nevents; ++i) |
| if (self->events [i].data.ptr == hndl) |
| self->events [i].events = 0; |
| } |
| |
| void nn_poller_set_in (struct nn_poller *self, struct nn_poller_hndl *hndl) |
| { |
| struct epoll_event ev; |
| |
| /* If already polling for IN, do nothing. */ |
| if (nn_slow (hndl->events & EPOLLIN)) |
| return; |
| |
| /* Start polling for IN. */ |
| hndl->events |= EPOLLIN; |
| memset (&ev, 0, sizeof (ev)); |
| ev.events = hndl->events; |
| ev.data.ptr = (void*) hndl; |
| epoll_ctl (self->ep, EPOLL_CTL_MOD, hndl->fd, &ev); |
| } |
| |
| void nn_poller_reset_in (struct nn_poller *self, struct nn_poller_hndl *hndl) |
| { |
| int i; |
| struct epoll_event ev; |
| |
| /* If not polling for IN, do nothing. */ |
| if (nn_slow (!(hndl->events & EPOLLIN))) |
| return; |
| |
| /* Stop polling for IN. */ |
| hndl->events &= ~EPOLLIN; |
| memset (&ev, 0, sizeof (ev)); |
| ev.events = hndl->events; |
| ev.data.ptr = (void*) hndl; |
| epoll_ctl (self->ep, EPOLL_CTL_MOD, hndl->fd, &ev); |
| |
| /* Invalidate any subsequent IN events on this file descriptor. */ |
| for (i = self->index; i != self->nevents; ++i) |
| if (self->events [i].data.ptr == hndl) |
| self->events [i].events &= ~EPOLLIN; |
| } |
| |
| void nn_poller_set_out (struct nn_poller *self, struct nn_poller_hndl *hndl) |
| { |
| struct epoll_event ev; |
| int fd = hndl->fd; |
| |
| /* If already polling for OUT, do nothing. */ |
| if (nn_slow (hndl->events & EPOLLOUT)) |
| return; |
| |
| /* Start polling for OUT. */ |
| hndl->events |= EPOLLOUT; |
| memset (&ev, 0, sizeof (ev)); |
| ev.events = hndl->events; |
| ev.data.ptr = (void*) hndl; |
| epoll_ctl (self->ep, EPOLL_CTL_MOD, fd, &ev); |
| } |
| |
| void nn_poller_reset_out (struct nn_poller *self, struct nn_poller_hndl *hndl) |
| { |
| int i; |
| struct epoll_event ev; |
| |
| /* If not polling for OUT, do nothing. */ |
| if (nn_slow (!(hndl->events & EPOLLOUT))) |
| return; |
| |
| /* Stop polling for OUT. */ |
| hndl->events &= ~EPOLLOUT; |
| memset (&ev, 0, sizeof (ev)); |
| ev.events = hndl->events; |
| ev.data.ptr = (void*) hndl; |
| epoll_ctl (self->ep, EPOLL_CTL_MOD, hndl->fd, &ev); |
| |
| /* Invalidate any subsequent OUT events on this file descriptor. */ |
| for (i = self->index; i != self->nevents; ++i) |
| if (self->events [i].data.ptr == hndl) |
| self->events [i].events &= ~EPOLLOUT; |
| } |
| |
| int nn_poller_wait (struct nn_poller *self, int timeout) |
| { |
| int nevents; |
| |
| /* Clear all existing events. */ |
| self->nevents = 0; |
| self->index = 0; |
| |
| /* Wait for new events. */ |
| while (1) { |
| nevents = epoll_wait (self->ep, self->events, |
| NN_POLLER_MAX_EVENTS, timeout); |
| if (nn_slow (nevents == -1 && errno == EINTR)) |
| continue; |
| break; |
| } |
| errno_assert (self->nevents != -1); |
| self->nevents = nevents; |
| return 0; |
| } |
| |
| int nn_poller_event (struct nn_poller *self, int *event, |
| struct nn_poller_hndl **hndl) |
| { |
| /* Skip over empty events. */ |
| while (self->index < self->nevents) { |
| if (self->events [self->index].events != 0) |
| break; |
| ++self->index; |
| } |
| |
| /* If there is no stored event, let the caller know. */ |
| if (nn_slow (self->index >= self->nevents)) |
| return -EAGAIN; |
| |
| /* Return next event to the caller. Remove the event from the set. */ |
| *hndl = (struct nn_poller_hndl*) self->events [self->index].data.ptr; |
| if (nn_fast (self->events [self->index].events & EPOLLIN)) { |
| *event = NN_POLLER_IN; |
| self->events [self->index].events &= ~EPOLLIN; |
| return 0; |
| } |
| else if (nn_fast (self->events [self->index].events & EPOLLOUT)) { |
| *event = NN_POLLER_OUT; |
| self->events [self->index].events &= ~EPOLLOUT; |
| return 0; |
| } |
| else { |
| *event = NN_POLLER_ERR; |
| ++self->index; |
| return 0; |
| } |
| } |
| |