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- /*
- * libev solaris event port backend
- *
- * Copyright (c) 2007,2008,2009,2010,2011,2019 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.
- */
-
- /* useful reading:
- *
- * http://bugs.opensolaris.org/view_bug.do?bug_id=6268715 (random results)
- * http://bugs.opensolaris.org/view_bug.do?bug_id=6455223 (just totally broken)
- * http://bugs.opensolaris.org/view_bug.do?bug_id=6873782 (manpage ETIME)
- * http://bugs.opensolaris.org/view_bug.do?bug_id=6874410 (implementation ETIME)
- * http://www.mail-archive.com/networking-discuss@opensolaris.org/msg11898.html ETIME vs. nget
- * http://src.opensolaris.org/source/xref/onnv/onnv-gate/usr/src/lib/libc/port/gen/event_port.c (libc)
- * http://cvs.opensolaris.org/source/xref/onnv/onnv-gate/usr/src/uts/common/fs/portfs/port.c#1325 (kernel)
- */
-
- #include <sys/types.h>
- #include <sys/time.h>
- #include <poll.h>
- #include <port.h>
- #include <string.h>
- #include <errno.h>
-
- inline_speed
- void
- port_associate_and_check (EV_P_ int fd, int ev)
- {
- if (0 >
- port_associate (
- backend_fd, PORT_SOURCE_FD, fd,
- (ev & EV_READ ? POLLIN : 0)
- | (ev & EV_WRITE ? POLLOUT : 0),
- 0
- )
- )
- {
- if (errno == EBADFD)
- {
- assert (("libev: port_associate found invalid fd", errno != EBADFD));
- fd_kill (EV_A_ fd);
- }
- else
- ev_syserr ("(libev) port_associate");
- }
- }
-
- static void
- port_modify (EV_P_ int fd, int oev, int nev)
- {
- /* we need to reassociate no matter what, as closes are
- * once more silently being discarded.
- */
- if (!nev)
- {
- if (oev)
- port_dissociate (backend_fd, PORT_SOURCE_FD, fd);
- }
- else
- port_associate_and_check (EV_A_ fd, nev);
- }
-
- static void
- port_poll (EV_P_ ev_tstamp timeout)
- {
- int res, i;
- struct timespec ts;
- uint_t nget = 1;
-
- /* we initialise this to something we will skip in the loop, as */
- /* port_getn can return with nget unchanged, but no indication */
- /* whether it was the original value or has been updated :/ */
- port_events [0].portev_source = 0;
-
- EV_RELEASE_CB;
- EV_TS_SET (ts, timeout);
- res = port_getn (backend_fd, port_events, port_eventmax, &nget, &ts);
- EV_ACQUIRE_CB;
-
- /* port_getn may or may not set nget on error */
- /* so we rely on port_events [0].portev_source not being updated */
- if (res == -1 && errno != ETIME && errno != EINTR)
- ev_syserr ("(libev) port_getn (see http://bugs.opensolaris.org/view_bug.do?bug_id=6268715, try LIBEV_FLAGS=3 env variable)");
-
- for (i = 0; i < nget; ++i)
- {
- if (port_events [i].portev_source == PORT_SOURCE_FD)
- {
- int fd = port_events [i].portev_object;
-
- fd_event (
- EV_A_
- fd,
- (port_events [i].portev_events & (POLLOUT | POLLERR | POLLHUP) ? EV_WRITE : 0)
- | (port_events [i].portev_events & (POLLIN | POLLERR | POLLHUP) ? EV_READ : 0)
- );
-
- fd_change (EV_A_ fd, EV__IOFDSET);
- }
- }
-
- if (ecb_expect_false (nget == port_eventmax))
- {
- ev_free (port_events);
- port_eventmax = array_nextsize (sizeof (port_event_t), port_eventmax, port_eventmax + 1);
- port_events = (port_event_t *)ev_malloc (sizeof (port_event_t) * port_eventmax);
- }
- }
-
- inline_size
- int
- port_init (EV_P_ int flags)
- {
- /* Initialize the kernel queue */
- if ((backend_fd = port_create ()) < 0)
- return 0;
-
- assert (("libev: PORT_SOURCE_FD must not be zero", PORT_SOURCE_FD));
-
- fcntl (backend_fd, F_SETFD, FD_CLOEXEC); /* not sure if necessary, hopefully doesn't hurt */
-
- /* if my reading of the opensolaris kernel sources are correct, then
- * opensolaris does something very stupid: it checks if the time has already
- * elapsed and doesn't round up if that is the case, otherwise it DOES round
- * up. Since we can't know what the case is, we need to guess by using a
- * "large enough" timeout. Normally, 1e-9 would be correct.
- */
- backend_mintime = EV_TS_CONST (1e-3); /* needed to compensate for port_getn returning early */
- backend_modify = port_modify;
- backend_poll = port_poll;
-
- port_eventmax = 64; /* initial number of events receivable per poll */
- port_events = (port_event_t *)ev_malloc (sizeof (port_event_t) * port_eventmax);
-
- return EVBACKEND_PORT;
- }
-
- inline_size
- void
- port_destroy (EV_P)
- {
- ev_free (port_events);
- }
-
- inline_size
- void
- port_fork (EV_P)
- {
- close (backend_fd);
-
- while ((backend_fd = port_create ()) < 0)
- ev_syserr ("(libev) port");
-
- fcntl (backend_fd, F_SETFD, FD_CLOEXEC);
-
- /* re-register interest in fds */
- fd_rearm_all (EV_A);
- }
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