/*
- * Copyright 2007 Marc Alexander Lehmann <libev@schmorp.de>
- * Copyright 2000-2002 Niels Provos <provos@citi.umich.edu>
+ * libev kqueue 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:
+ * 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.
*
- * 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.
- * 3. The name of the author may not be used to endorse or promote products
- * derived from this software without specific prior written permission.
+ * * 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 MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
- * IN NO EVENT SHALL THE AUTHOR 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,
+ * 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.
+ * (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/types.h>
#include <string.h>
#include <errno.h>
-static void
+void inline_speed
kqueue_change (EV_P_ int fd, int filter, int flags, int fflags)
{
struct kevent *ke;
++kqueue_changecnt;
array_needsize (struct kevent, kqueue_changes, kqueue_changemax, kqueue_changecnt, EMPTY2);
- ke = &kqueue_changes [kqueue_changecnt - 1];
- memset (ke, 0, sizeof (struct kevent));
- ke->ident = fd;
- ke->filter = filter;
- ke->flags = flags;
- ke->fflags = fflags;
+ EV_SET (&kqueue_changes [kqueue_changecnt - 1], fd, filter, flags, fflags, 0, 0);
}
#ifndef NOTE_EOF
static void
kqueue_modify (EV_P_ int fd, int oev, int nev)
{
- /* to detect close/reopen reliably, we have to remove and re-add */
- /* event requests even when oev == nev */
+ if (oev != nev)
+ {
+ if (oev & EV_READ)
+ kqueue_change (EV_A_ fd, EVFILT_READ , EV_DELETE, 0);
- if (oev & EV_READ)
- kqueue_change (EV_A_ fd, EVFILT_READ, EV_DELETE, 0);
+ if (oev & EV_WRITE)
+ kqueue_change (EV_A_ fd, EVFILT_WRITE, EV_DELETE, 0);
+ }
- if (oev & EV_WRITE)
- kqueue_change (EV_A_ fd, EVFILT_WRITE, EV_DELETE, 0);
+ /* to detect close/reopen reliably, we have to re-add */
+ /* event requests even when oev == nev */
if (nev & EV_READ)
- kqueue_change (EV_A_ fd, EVFILT_READ, EV_ADD, NOTE_EOF);
+ kqueue_change (EV_A_ fd, EVFILT_READ , EV_ADD, NOTE_EOF);
if (nev & EV_WRITE)
kqueue_change (EV_A_ fd, EVFILT_WRITE, EV_ADD, NOTE_EOF);
if (kqueue_changecnt > kqueue_eventmax)
{
ev_free (kqueue_events);
- kqueue_eventmax = array_roundsize (struct kevent, kqueue_changecnt);
+ kqueue_eventmax = array_nextsize (sizeof (struct kevent), kqueue_eventmax, kqueue_changecnt);
kqueue_events = (struct kevent *)ev_malloc (sizeof (struct kevent) * kqueue_eventmax);
}
ts.tv_sec = (time_t)timeout;
ts.tv_nsec = (long)((timeout - (ev_tstamp)ts.tv_sec) * 1e9);
- res = kevent (kqueue_fd, kqueue_changes, kqueue_changecnt, kqueue_events, kqueue_eventmax, &ts);
+ res = kevent (backend_fd, kqueue_changes, kqueue_changecnt, kqueue_events, kqueue_eventmax, &ts);
kqueue_changecnt = 0;
if (res < 0)
{
int fd = kqueue_events [i].ident;
- if (kqueue_events [i].flags & EV_ERROR)
+ if (expect_false (kqueue_events [i].flags & EV_ERROR))
{
int err = kqueue_events [i].data;
- /*
- * errors that may happen
- * EBADF happens when the file discriptor has been
- * closed,
- * ENOENT when the file descriptor was closed and
- * then reopened.
- * EINVAL for some reasons not understood; EINVAL
- * should not be returned ever; but FreeBSD does :-\
- */
-
/* we are only interested in errors for fds that we are interested in :) */
if (anfds [fd].events)
{
if (expect_false (res == kqueue_eventmax))
{
ev_free (kqueue_events);
- kqueue_eventmax = array_roundsize (struct kevent, kqueue_eventmax << 1);
+ kqueue_eventmax = array_nextsize (sizeof (struct kevent), kqueue_eventmax, kqueue_eventmax + 1);
kqueue_events = (struct kevent *)ev_malloc (sizeof (struct kevent) * kqueue_eventmax);
}
}
-static int
+int inline_size
kqueue_init (EV_P_ int flags)
{
struct kevent ch, ev;
/* Initalize the kernel queue */
- if ((kqueue_fd = kqueue ()) < 0)
+ if ((backend_fd = kqueue ()) < 0)
return 0;
- fcntl (kqueue_fd, F_SETFD, FD_CLOEXEC); /* not sure if necessary, hopefully doesn't hurt */
-
- /* Check for Mac OS X kqueue bug. */
- ch.ident = -1;
- ch.filter = EVFILT_READ;
- ch.flags = EV_ADD;
-
- /*
- * If kqueue works, then kevent will succeed, and it will
- * stick an error in ev. If kqueue is broken, then
- * kevent will fail.
- */
- if (kevent (kqueue_fd, &ch, 1, &ev, 1, 0) != 1
- || ev.ident != -1
- || ev.flags != EV_ERROR)
- {
- /* detected broken kqueue */
- close (kqueue_fd);
- return 0;
- }
+ fcntl (backend_fd, F_SETFD, FD_CLOEXEC); /* not sure if necessary, hopefully doesn't hurt */
+ /* fudge *might* be zero from the documentation, but bsd docs are notoriously wrong */
backend_fudge = 1e-3; /* needed to compensate for kevent returning early */
backend_modify = kqueue_modify;
backend_poll = kqueue_poll;
- kqueue_eventmax = 64; /* intiial number of events receivable per poll */
+ kqueue_eventmax = 64; /* initial number of events receivable per poll */
kqueue_events = (struct kevent *)ev_malloc (sizeof (struct kevent) * kqueue_eventmax);
kqueue_changes = 0;
return EVBACKEND_KQUEUE;
}
-static void
+void inline_size
kqueue_destroy (EV_P)
{
- close (kqueue_fd);
-
ev_free (kqueue_events);
ev_free (kqueue_changes);
}
-static void
+void inline_size
kqueue_fork (EV_P)
{
- close (kqueue_fd);
+ close (backend_fd);
- while ((kqueue_fd = kqueue ()) < 0)
+ while ((backend_fd = kqueue ()) < 0)
syserr ("(libev) kqueue");
- fcntl (kqueue_fd, F_SETFD, FD_CLOEXEC);
+ fcntl (backend_fd, F_SETFD, FD_CLOEXEC);
/* re-register interest in fds */
fd_rearm_all (EV_A);
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