Mirror of :pserver:anonymous@cvs.schmorp.de/schmorpforge libev http://software.schmorp.de/pkg/libev.html
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/*
* libev poll fd activity backend
*
* Copyright (c) 2007 Marc Alexander Lehmann <libev@schmorp.de>
* 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.
*
* 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 <poll.h>
static void
pollidx_init (int *base, int count)
{
while (count--)
*base++ = -1;
}
static void
poll_modify (EV_P_ int fd, int oev, int nev)
{
int idx;
if (oev == nev)
return;
array_needsize (int, pollidxs, pollidxmax, fd + 1, pollidx_init);
idx = pollidxs [fd];
if (idx < 0) /* need to allocate a new pollfd */
{
pollidxs [fd] = idx = pollcnt++;
array_needsize (struct pollfd, polls, pollmax, pollcnt, EMPTY2);
polls [idx].fd = fd;
}
assert (polls [idx].fd == fd);
if (nev)
polls [idx].events =
(nev & EV_READ ? POLLIN : 0)
| (nev & EV_WRITE ? POLLOUT : 0);
else /* remove pollfd */
{
pollidxs [fd] = -1;
if (idx < --pollcnt)
{
polls [idx] = polls [pollcnt];
pollidxs [polls [idx].fd] = idx;
}
}
}
static void
poll_poll (EV_P_ ev_tstamp timeout)
{
int i;
int res = poll (polls, pollcnt, (int)ceil (timeout * 1000.));
if (res < 0)
{
if (errno == EBADF)
fd_ebadf (EV_A);
else if (errno == ENOMEM && !syserr_cb)
fd_enomem (EV_A);
else if (errno != EINTR)
syserr ("(libev) poll");
return;
}
for (i = 0; i < pollcnt; ++i)
if (polls [i].revents & POLLNVAL)
fd_kill (EV_A_ polls [i].fd);
else
fd_event (
EV_A_
polls [i].fd,
(polls [i].revents & (POLLOUT | POLLERR | POLLHUP) ? EV_WRITE : 0)
| (polls [i].revents & (POLLIN | POLLERR | POLLHUP) ? EV_READ : 0)
);
}
int inline_size
poll_init (EV_P_ int flags)
{
backend_fudge = 1e-3; /* needed to compensate for select returning early, very conservative */
backend_modify = poll_modify;
backend_poll = poll_poll;
pollidxs = 0; pollidxmax = 0;
polls = 0; pollmax = 0; pollcnt = 0;
return EVBACKEND_POLL;
}
void inline_size
poll_destroy (EV_P)
{
ev_free (pollidxs);
ev_free (polls);
}