-
/*
- * 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 int kq_fd;
-static struct kevent *kq_changes;
-static int kq_changemax, kq_changecnt;
-static struct kevent *kq_events;
-static int kq_eventmax;
-
static void
-kqueue_change (int fd, int filter, int flags, int fflags)
+kqueue_change (EV_P_ int fd, int filter, int flags, int fflags)
{
struct kevent *ke;
- array_needsize (kq_changes, kq_changemax, ++kq_changecnt, );
+ ++kqueue_changecnt;
+ array_needsize (struct kevent, kqueue_changes, kqueue_changemax, kqueue_changecnt, EMPTY2);
- ke = &kq_changes [kq_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
+# define NOTE_EOF 0
+#endif
+
static void
-kqueue_modify (int fd, int oev, int nev)
+kqueue_modify (EV_P_ int fd, int oev, int nev)
{
- if ((oev ^ new) & EV_READ)
+ if (oev != nev)
{
- if (nev & EV_READ)
- kqueue_change (fd, EVFILT_READ, EV_ADD, NOTE_EOF);
- else
- kqueue_change (fd, EVFILT_READ, EV_DELETE, 0);
- }
+ if (oev & EV_READ)
+ kqueue_change (EV_A_ fd, EVFILT_READ , EV_DELETE, 0);
- if ((oev ^ new) & EV_WRITE)
- {
- if (nev & EV_WRITE)
- kqueue_change (fd, EVFILT_WRITE, EV_ADD, NOTE_EOF);
- else
- kqueue_change (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);
+
+ if (nev & EV_WRITE)
+ kqueue_change (EV_A_ fd, EVFILT_WRITE, EV_ADD, NOTE_EOF);
}
static void
-kqueue_poll (ev_tstamp timeout)
+kqueue_poll (EV_P_ ev_tstamp timeout)
{
int res, i;
struct timespec ts;
+ /* need to resize so there is enough space for errors */
+ if (kqueue_changecnt > kqueue_eventmax)
+ {
+ ev_free (kqueue_events);
+ kqueue_eventmax = array_roundsize (struct kevent, 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 (kq_fd, kq_changes, kq_changecnt, kq_events, kq_eventmax, &ts);
- kq_changecnt = 0;
+ ts.tv_nsec = (long)((timeout - (ev_tstamp)ts.tv_sec) * 1e9);
+ res = kevent (backend_fd, kqueue_changes, kqueue_changecnt, kqueue_events, kqueue_eventmax, &ts);
+ kqueue_changecnt = 0;
if (res < 0)
- return;
+ {
+ if (errno != EINTR)
+ syserr ("(libev) kevent");
+
+ return;
+ }
for (i = 0; i < res; ++i)
{
- if (kq_events [i].flags & EV_ERROR)
+ int fd = kqueue_events [i].ident;
+
+ if (expect_false (kqueue_events [i].flags & EV_ERROR))
{
- /*
- * Error messages that can happen, when a delete fails.
- * EBADF happens when the file discriptor has been
- * closed,
- * ENOENT when the file discriptor was closed and
- * then reopened.
- * EINVAL for some reasons not understood; EINVAL
- * should not be returned ever; but FreeBSD does :-\
- * An error is also indicated when a callback deletes
- * an event we are still processing. In that case
- * the data field is set to ENOENT.
- */
- if (events [i].data == EBADF)
- fd_kill (events [i].ident);
+ int err = kqueue_events [i].data;
+
+ /* we are only interested in errors for fds that we are interested in :) */
+ if (anfds [fd].events)
+ {
+ if (err == ENOENT) /* resubmit changes on ENOENT */
+ kqueue_modify (EV_A_ fd, 0, anfds [fd].events);
+ else if (err == EBADF) /* on EBADF, we re-check the fd */
+ {
+ if (fd_valid (fd))
+ kqueue_modify (EV_A_ fd, 0, anfds [fd].events);
+ else
+ fd_kill (EV_A_ fd);
+ }
+ else /* on all other errors, we error out on the fd */
+ fd_kill (EV_A_ fd);
+ }
}
else
- event (
- events [i].ident,
- events [i].filter == EVFILT_READ ? EV_READ
- : events [i].filter == EVFILT_WRITE ? EV_WRITE
+ fd_event (
+ EV_A_
+ fd,
+ kqueue_events [i].filter == EVFILT_READ ? EV_READ
+ : kqueue_events [i].filter == EVFILT_WRITE ? EV_WRITE
: 0
);
}
- if (expect_false (res == kq_eventmax))
+ if (expect_false (res == kqueue_eventmax))
{
- free (kq_events);
- kq_eventmax = array_roundsize (kq_events, kq_eventmax << 1);
- kq_events = malloc (sizeof (struct kevent) * kq_eventmax);
+ ev_free (kqueue_events);
+ kqueue_eventmax = array_roundsize (struct kevent, kqueue_eventmax << 1);
+ kqueue_events = (struct kevent *)ev_malloc (sizeof (struct kevent) * kqueue_eventmax);
}
}
-static void
-kqueue_init (struct event_base *base)
+static int
+kqueue_init (EV_P_ int flags)
{
struct kevent ch, ev;
/* Initalize the kernel queue */
- if ((kq_fd = kqueue ()) < 0)
- return;
-
- /* 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 events[0]. If kqueue is broken, then
- * kevent will fail.
- */
- if (kevent (kq_fd, &ch, 1, &ev, 1, 0) != 1
- || ev.ident != -1
- || ev.flags != EV_ERROR)
- {
- /* detected broken kqueue */
- close (kq_fd);
- return;
- }
+ if ((backend_fd = kqueue ()) < 0)
+ 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; /* initial number of events receivable per poll */
+ kqueue_events = (struct kevent *)ev_malloc (sizeof (struct kevent) * kqueue_eventmax);
+
+ kqueue_changes = 0;
+ kqueue_changemax = 0;
+ kqueue_changecnt = 0;
+
+ return EVBACKEND_KQUEUE;
+}
+
+static void
+kqueue_destroy (EV_P)
+{
+ close (backend_fd);
+
+ ev_free (kqueue_events);
+ ev_free (kqueue_changes);
+}
+
+static void
+kqueue_fork (EV_P)
+{
+ close (backend_fd);
+
+ while ((backend_fd = kqueue ()) < 0)
+ syserr ("(libev) kqueue");
- ev_method = EVMETHOD_KQUEUE;
- method_fudge = 1e-3; /* needed to compensate for kevent returning early */
- method_modify = kq_modify;
- method_poll = kq_poll;
+ fcntl (backend_fd, F_SETFD, FD_CLOEXEC);
- kq_eventmax = 64; /* intiial number of events receivable per poll */
- kq_events = malloc (sizeof (struct kevent) * kq_eventmax);
+ /* re-register interest in fds */
+ fd_rearm_all (EV_A);
}
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