libev/ev_poll.c

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/*
* libev poll fd activity backend
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*
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* Copyright (c) 2007,2008 Marc Alexander Lehmann <libev@schmorp.de>
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* All rights reserved.
*
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* Redistribution and use in source and binary forms, with or without modifica-
* tion, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* 2. 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 AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MER-
* CHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
* EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPE-
* CIAL, 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 OTH-
* ERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* Alternatively, the contents of this file may be used under the terms of
* the GNU General Public License ("GPL") version 2 or any later version,
* in which case the provisions of the GPL are applicable instead of
* the above. If you wish to allow the use of your version of this file
* only under the terms of the GPL and not to allow others to use your
* version of this file under the BSD license, indicate your decision
* by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL. If you do not delete the
* provisions above, a recipient may use your version of this file under
* either the BSD or the GPL.
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*/
#include <poll.h>
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void inline_size
pollidx_init (int *base, int count)
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{
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/* consider using memset (.., -1, ...), which is pratically guarenteed
* to work on all systems implementing poll */
while (count--)
*base++ = -1;
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}
static void
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poll_modify (EV_P_ int fd, int oev, int nev)
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{
int idx;
if (oev == nev)
return;
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array_needsize (int, 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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pollidxs [fd] = idx = pollcnt++;
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array_needsize (struct pollfd, polls, pollmax, pollcnt, EMPTY2);
polls [idx].fd = fd;
}
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assert (polls [idx].fd == fd);
if (nev)
polls [idx].events =
(nev & EV_READ ? POLLIN : 0)
| (nev & EV_WRITE ? POLLOUT : 0);
else /* remove pollfd */
{
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pollidxs [fd] = -1;
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if (expect_true (idx < --pollcnt))
{
polls [idx] = polls [pollcnt];
pollidxs [polls [idx].fd] = idx;
}
}
}
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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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struct pollfd *p;
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int res = poll (polls, pollcnt, (int)ceil (timeout * 1000.));
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if (expect_false (res < 0))
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{
if (errno == EBADF)
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fd_ebadf (EV_A);
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else if (errno == ENOMEM && !syserr_cb)
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fd_enomem (EV_A);
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else if (errno != EINTR)
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syserr ("(libev) poll");
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}
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else
for (p = polls; res; ++p)
if (expect_false (p->revents)) /* this expect is debatable */
{
--res;
if (expect_false (p->revents & POLLNVAL))
fd_kill (EV_A_ p->fd);
else
fd_event (
EV_A_
p->fd,
(p->revents & (POLLOUT | POLLERR | POLLHUP) ? EV_WRITE : 0)
| (p->revents & (POLLIN | POLLERR | POLLHUP) ? EV_READ : 0)
);
}
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}
int inline_size
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poll_init (EV_P_ int flags)
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{
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backend_fudge = 0.; /* posix says this is zero */
backend_modify = poll_modify;
backend_poll = poll_poll;
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pollidxs = 0; pollidxmax = 0;
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polls = 0; pollmax = 0; pollcnt = 0;
return EVBACKEND_POLL;
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}
void inline_size
poll_destroy (EV_P)
{
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ev_free (pollidxs);
ev_free (polls);
}
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