mirror of /home/gitosis/repositories/libev.git
116 lines
3.1 KiB
C
116 lines
3.1 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 <poll.h>
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static void
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pollidx_init (int *base, int count)
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{
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while (count--)
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*base++ = -1;
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}
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static void
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poll_modify (EV_P_ int fd, int oev, int nev)
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{
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int idx;
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array_needsize (pollidxs, pollidxmax, fd + 1, pollidx_init);
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idx = pollidxs [fd];
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if (idx < 0) /* need to allocate a new pollfd */
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{
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idx = pollcnt++;
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array_needsize (polls, pollmax, pollcnt, );
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polls [idx].fd = fd;
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}
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if (nev)
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polls [idx].events =
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(nev & EV_READ ? POLLIN : 0)
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| (nev & EV_WRITE ? POLLOUT : 0);
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else /* remove pollfd */
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{
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if (idx < pollcnt--)
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{
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pollidxs [fd] = -1;
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polls [idx] = polls [pollcnt];
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pollidxs [polls [idx].fd] = idx;
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}
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}
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}
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static void
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poll_poll (EV_P_ ev_tstamp timeout)
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{
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int res = poll (polls, pollcnt, ceil (timeout * 1000.));
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if (res > 0)
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{
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int i;
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for (i = 0; i < pollcnt; ++i)
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fd_event (
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EV_A_
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polls [i].fd,
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(polls [i].revents & (POLLOUT | POLLERR | POLLHUP) ? EV_WRITE : 0)
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| (polls [i].revents & (POLLIN | POLLERR | POLLHUP) ? EV_READ : 0)
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);
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}
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else if (res < 0)
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{
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if (errno == EBADF)
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fd_ebadf (EV_A);
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else if (errno == ENOMEM)
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fd_enomem (EV_A);
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}
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}
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static int
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poll_init (EV_P_ int flags)
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{
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method_fudge = 1e-3; /* needed to compensate for select returning early, very conservative */
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method_modify = poll_modify;
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method_poll = poll_poll;
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pollidxs = 0; pollidxmax = 0;
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polls = 0; pollsmax = 0; pollscnt = 0;
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return EVMETHOD_POLL;
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}
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static void
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poll_destroy (EV_P)
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{
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free (pollidxs);
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free (polls);
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}
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