X-Git-Url: https://git.llucax.com/software/libev.git/blobdiff_plain/8ee8df9cf84f6ae595eb82ebe7e5eb119112087e..40ea26d7fa3e9214a7da4bb1280515948e1a1568:/ev_kqueue.c diff --git a/ev_kqueue.c b/ev_kqueue.c index e68654f..7a34e9b 100644 --- a/ev_kqueue.c +++ b/ev_kqueue.c @@ -1,31 +1,32 @@ - /* - * Copyright 2007 Marc Alexander Lehmann - * Copyright 2000-2002 Niels Provos + * libev kqueue backend + * + * Copyright (c) 2007 Marc Alexander Lehmann * 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 @@ -35,145 +36,158 @@ #include #include -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 ()) == -1) - { - free (kqueueop); - return; - } + if ((backend_fd = kqueue ()) < 0) + return 0; - /* Initalize fields */ - kq_changes = malloc (NEVENT * sizeof (struct kevent)); - if (!kq_changes) - return; + fcntl (backend_fd, F_SETFD, FD_CLOEXEC); /* not sure if necessary, hopefully doesn't hurt */ - events = malloc (NEVENT * sizeof (struct kevent)); - if (!events) - { - free (kq_changes); - return; - } + /* 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; - /* Check for Mac OS X kqueue bug. */ - kq_changes [0].ident = -1; - kq_changes [0].filter = EVFILT_READ; - kq_changes [0].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, kq_changes, 1, kq_events, NEVENT, NULL) != 1 - || kq_events[0].ident != -1 - || kq_events[0].flags != EV_ERROR) - { - /* detected broken kqueue */ - free (kq_changes); - free (kq_events); - close (kq_fd); - return; - } + 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); }