diff options
Diffstat (limited to 'libev/ev_kqueue.c')
| -rw-r--r-- | libev/ev_kqueue.c | 224 |
1 files changed, 224 insertions, 0 deletions
diff --git a/libev/ev_kqueue.c b/libev/ev_kqueue.c new file mode 100644 index 0000000..69c5147 --- /dev/null +++ b/libev/ev_kqueue.c @@ -0,0 +1,224 @@ +/* + * libev kqueue backend + * + * Copyright (c) 2007,2008,2009,2010,2011,2012,2013,2016,2019 Marc Alexander Lehmann <libev@schmorp.de> + * All rights reserved. + * + * 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. + * + * 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. + */ + +#include <sys/types.h> +#include <sys/time.h> +#include <sys/event.h> +#include <string.h> +#include <errno.h> + +inline_speed +void +kqueue_change (EV_P_ int fd, int filter, int flags, int fflags) +{ + ++kqueue_changecnt; + array_needsize (struct kevent, kqueue_changes, kqueue_changemax, kqueue_changecnt, array_needsize_noinit); + + EV_SET (&kqueue_changes [kqueue_changecnt - 1], fd, filter, flags, fflags, 0, 0); +} + +/* OS X at least needs this */ +#ifndef EV_ENABLE +# define EV_ENABLE 0 +#endif +#ifndef NOTE_EOF +# define NOTE_EOF 0 +#endif + +static void +kqueue_modify (EV_P_ int fd, int oev, int nev) +{ + if (oev != nev) + { + 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); + } + + /* 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 | EV_ENABLE, NOTE_EOF); + + if (nev & EV_WRITE) + kqueue_change (EV_A_ fd, EVFILT_WRITE, EV_ADD | EV_ENABLE, NOTE_EOF); +} + +static void +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_nextsize (sizeof (struct kevent), kqueue_eventmax, kqueue_changecnt); + kqueue_events = (struct kevent *)ev_malloc (sizeof (struct kevent) * kqueue_eventmax); + } + + EV_RELEASE_CB; + EV_TS_SET (ts, timeout); + res = kevent (backend_fd, kqueue_changes, kqueue_changecnt, kqueue_events, kqueue_eventmax, &ts); + EV_ACQUIRE_CB; + kqueue_changecnt = 0; + + if (ecb_expect_false (res < 0)) + { + if (errno != EINTR) + ev_syserr ("(libev) kqueue kevent"); + + return; + } + + for (i = 0; i < res; ++i) + { + int fd = kqueue_events [i].ident; + + if (ecb_expect_false (kqueue_events [i].flags & EV_ERROR)) + { + 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 + { + assert (("libev: kqueue found invalid fd", 0)); + fd_kill (EV_A_ fd); + } + } + else /* on all other errors, we error out on the fd */ + { + assert (("libev: kqueue found invalid fd", 0)); + fd_kill (EV_A_ fd); + } + } + } + else + fd_event ( + EV_A_ + fd, + kqueue_events [i].filter == EVFILT_READ ? EV_READ + : kqueue_events [i].filter == EVFILT_WRITE ? EV_WRITE + : 0 + ); + } + + if (ecb_expect_false (res == kqueue_eventmax)) + { + ev_free (kqueue_events); + kqueue_eventmax = array_nextsize (sizeof (struct kevent), kqueue_eventmax, kqueue_eventmax + 1); + kqueue_events = (struct kevent *)ev_malloc (sizeof (struct kevent) * kqueue_eventmax); + } +} + +inline_size +int +kqueue_init (EV_P_ int flags) +{ + /* initialize the kernel queue */ + kqueue_fd_pid = getpid (); + if ((backend_fd = kqueue ()) < 0) + return 0; + + fcntl (backend_fd, F_SETFD, FD_CLOEXEC); /* not sure if necessary, hopefully doesn't hurt */ + + backend_mintime = EV_TS_CONST (1e-9); /* apparently, they did the right thing in freebsd */ + 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; +} + +inline_size +void +kqueue_destroy (EV_P) +{ + ev_free (kqueue_events); + ev_free (kqueue_changes); +} + +inline_size +void +kqueue_fork (EV_P) +{ + /* some BSD kernels don't just destroy the kqueue itself, + * but also close the fd, which isn't documented, and + * impossible to support properly. + * we remember the pid of the kqueue call and only close + * the fd if the pid is still the same. + * this leaks fds on sane kernels, but BSD interfaces are + * notoriously buggy and rarely get fixed. + */ + pid_t newpid = getpid (); + + if (newpid == kqueue_fd_pid) + close (backend_fd); + + kqueue_fd_pid = newpid; + while ((backend_fd = kqueue ()) < 0) + ev_syserr ("(libev) kqueue"); + + fcntl (backend_fd, F_SETFD, FD_CLOEXEC); + + /* re-register interest in fds */ + fd_rearm_all (EV_A); +} + +/* sys/event.h defines EV_ERROR */ +#undef EV_ERROR + |