mirror of /home/gitosis/repositories/libev.git
123 lines
3.6 KiB
C
123 lines
3.6 KiB
C
/*
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* libev epoll fd activity backend
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*
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* Copyright (c) 2007 Marc Alexander Lehmann <libev@schmorp.de>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* * Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials provided
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* with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/epoll.h>
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static void
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epoll_modify (EV_P_ int fd, int oev, int nev)
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{
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int mode = nev ? oev ? EPOLL_CTL_MOD : EPOLL_CTL_ADD : EPOLL_CTL_DEL;
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struct epoll_event ev;
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ev.data.u64 = fd; /* use u64 to fully initialise the struct, for nicer strace etc. */
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ev.events =
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(nev & EV_READ ? EPOLLIN : 0)
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| (nev & EV_WRITE ? EPOLLOUT : 0);
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if (epoll_ctl (backend_fd, mode, fd, &ev))
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if (errno != ENOENT /* on ENOENT the fd went away, so try to do the right thing */
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|| (nev && epoll_ctl (backend_fd, EPOLL_CTL_ADD, fd, &ev)))
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fd_kill (EV_A_ fd);
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}
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static void
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epoll_poll (EV_P_ ev_tstamp timeout)
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{
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int i;
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int eventcnt = epoll_wait (backend_fd, epoll_events, epoll_eventmax, (int)ceil (timeout * 1000.));
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if (eventcnt < 0)
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{
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if (errno != EINTR)
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syserr ("(libev) epoll_wait");
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return;
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}
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for (i = 0; i < eventcnt; ++i)
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fd_event (
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EV_A_
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epoll_events [i].data.u64,
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(epoll_events [i].events & (EPOLLOUT | EPOLLERR | EPOLLHUP) ? EV_WRITE : 0)
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| (epoll_events [i].events & (EPOLLIN | EPOLLERR | EPOLLHUP) ? EV_READ : 0)
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);
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/* if the receive array was full, increase its size */
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if (expect_false (eventcnt == epoll_eventmax))
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{
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ev_free (epoll_events);
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epoll_eventmax = array_roundsize (epoll_events, epoll_eventmax << 1);
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epoll_events = (struct epoll_event *)ev_malloc (sizeof (struct epoll_event) * epoll_eventmax);
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}
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}
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static int
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epoll_init (EV_P_ int flags)
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{
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backend_fd = epoll_create (256);
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if (backend_fd < 0)
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return 0;
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fcntl (backend_fd, F_SETFD, FD_CLOEXEC);
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backend_fudge = 1e-3; /* needed to compensate for epoll returning early */
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backend_modify = epoll_modify;
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backend_poll = epoll_poll;
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epoll_eventmax = 64; /* intiial number of events receivable per poll */
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epoll_events = (struct epoll_event *)ev_malloc (sizeof (struct epoll_event) * epoll_eventmax);
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return EVBACKEND_EPOLL;
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}
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static void
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epoll_destroy (EV_P)
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{
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close (backend_fd);
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ev_free (epoll_events);
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}
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static void
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epoll_fork (EV_P)
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{
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close (backend_fd);
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while ((backend_fd = epoll_create (256)) < 0)
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syserr ("(libev) epoll_create");
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fcntl (backend_fd, F_SETFD, FD_CLOEXEC);
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fd_rearm_all (EV_A);
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}
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