| /* Linux epoll(2) based ae.c module |
| * |
| * Copyright (c) 2009-2012, Salvatore Sanfilippo <antirez at gmail dot com> |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions are met: |
| * |
| * * Redistributions of source code must retain the above copyright notice, |
| * this list of conditions and the following disclaimer. |
| * * Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * * Neither the name of Redis nor the names of its contributors may be used |
| * to endorse or promote products derived from this software without |
| * specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
| * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE |
| * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
| * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
| * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
| * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
| * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
| * POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| |
| #include <sys/epoll.h> |
| |
| typedef struct aeApiState { |
| int epfd; |
| struct epoll_event *events; |
| } aeApiState; |
| |
| static int aeApiCreate(aeEventLoop *eventLoop) { |
| aeApiState *state = zmalloc(sizeof(aeApiState)); |
| |
| if (!state) return -1; |
| state->events = zmalloc(sizeof(struct epoll_event)*eventLoop->setsize); |
| if (!state->events) { |
| zfree(state); |
| return -1; |
| } |
| state->epfd = epoll_create(1024); /* 1024 is just an hint for the kernel */ |
| if (state->epfd == -1) { |
| zfree(state->events); |
| zfree(state); |
| return -1; |
| } |
| eventLoop->apidata = state; |
| return 0; |
| } |
| |
| static void aeApiFree(aeEventLoop *eventLoop) { |
| aeApiState *state = eventLoop->apidata; |
| |
| close(state->epfd); |
| zfree(state->events); |
| zfree(state); |
| } |
| |
| static int aeApiAddEvent(aeEventLoop *eventLoop, int fd, int mask) { |
| aeApiState *state = eventLoop->apidata; |
| struct epoll_event ee; |
| /* If the fd was already monitored for some event, we need a MOD |
| * operation. Otherwise we need an ADD operation. */ |
| int op = eventLoop->events[fd].mask == AE_NONE ? |
| EPOLL_CTL_ADD : EPOLL_CTL_MOD; |
| |
| ee.events = 0; |
| mask |= eventLoop->events[fd].mask; /* Merge old events */ |
| if (mask & AE_READABLE) ee.events |= EPOLLIN; |
| if (mask & AE_WRITABLE) ee.events |= EPOLLOUT; |
| ee.data.u64 = 0; /* avoid valgrind warning */ |
| ee.data.fd = fd; |
| if (epoll_ctl(state->epfd,op,fd,&ee) == -1) return -1; |
| return 0; |
| } |
| |
| static void aeApiDelEvent(aeEventLoop *eventLoop, int fd, int delmask) { |
| aeApiState *state = eventLoop->apidata; |
| struct epoll_event ee; |
| int mask = eventLoop->events[fd].mask & (~delmask); |
| |
| ee.events = 0; |
| if (mask & AE_READABLE) ee.events |= EPOLLIN; |
| if (mask & AE_WRITABLE) ee.events |= EPOLLOUT; |
| ee.data.u64 = 0; /* avoid valgrind warning */ |
| ee.data.fd = fd; |
| if (mask != AE_NONE) { |
| epoll_ctl(state->epfd,EPOLL_CTL_MOD,fd,&ee); |
| } else { |
| /* Note, Kernel < 2.6.9 requires a non null event pointer even for |
| * EPOLL_CTL_DEL. */ |
| epoll_ctl(state->epfd,EPOLL_CTL_DEL,fd,&ee); |
| } |
| } |
| |
| static int aeApiPoll(aeEventLoop *eventLoop, struct timeval *tvp) { |
| aeApiState *state = eventLoop->apidata; |
| int retval, numevents = 0; |
| |
| retval = epoll_wait(state->epfd,state->events,eventLoop->setsize, |
| tvp ? (tvp->tv_sec*1000 + tvp->tv_usec/1000) : -1); |
| if (retval > 0) { |
| int j; |
| |
| numevents = retval; |
| for (j = 0; j < numevents; j++) { |
| int mask = 0; |
| struct epoll_event *e = state->events+j; |
| |
| if (e->events & EPOLLIN) mask |= AE_READABLE; |
| if (e->events & EPOLLOUT) mask |= AE_WRITABLE; |
| if (e->events & EPOLLERR) mask |= AE_WRITABLE; |
| if (e->events & EPOLLHUP) mask |= AE_WRITABLE; |
| eventLoop->fired[j].fd = e->data.fd; |
| eventLoop->fired[j].mask = mask; |
| } |
| } |
| return numevents; |
| } |
| |
| static char *aeApiName(void) { |
| return "epoll"; |
| } |