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added libev files
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wangyu-
189
libev/ev_port.c
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189
libev/ev_port.c
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/*
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* libev solaris event port backend
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*
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* Copyright (c) 2007,2008,2009,2010,2011 Marc Alexander Lehmann <libev@schmorp.de>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without modifica-
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* tion, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MER-
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* CHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
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* EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPE-
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* CIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTH-
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* ERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* Alternatively, the contents of this file may be used under the terms of
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* the GNU General Public License ("GPL") version 2 or any later version,
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* in which case the provisions of the GPL are applicable instead of
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* the above. If you wish to allow the use of your version of this file
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* only under the terms of the GPL and not to allow others to use your
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* version of this file under the BSD license, indicate your decision
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* by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL. If you do not delete the
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* provisions above, a recipient may use your version of this file under
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* either the BSD or the GPL.
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*/
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/* useful reading:
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*
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* http://bugs.opensolaris.org/view_bug.do?bug_id=6268715 (random results)
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* http://bugs.opensolaris.org/view_bug.do?bug_id=6455223 (just totally broken)
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* http://bugs.opensolaris.org/view_bug.do?bug_id=6873782 (manpage ETIME)
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* http://bugs.opensolaris.org/view_bug.do?bug_id=6874410 (implementation ETIME)
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* http://www.mail-archive.com/networking-discuss@opensolaris.org/msg11898.html ETIME vs. nget
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* http://src.opensolaris.org/source/xref/onnv/onnv-gate/usr/src/lib/libc/port/gen/event_port.c (libc)
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* http://cvs.opensolaris.org/source/xref/onnv/onnv-gate/usr/src/uts/common/fs/portfs/port.c#1325 (kernel)
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*/
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#include <sys/types.h>
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#include <sys/time.h>
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#include <poll.h>
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#include <port.h>
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#include <string.h>
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#include <errno.h>
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inline_speed
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void
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port_associate_and_check (EV_P_ int fd, int ev)
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{
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if (0 >
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port_associate (
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backend_fd, PORT_SOURCE_FD, fd,
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(ev & EV_READ ? POLLIN : 0)
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| (ev & EV_WRITE ? POLLOUT : 0),
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0
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)
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)
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{
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if (errno == EBADFD)
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fd_kill (EV_A_ fd);
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else
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ev_syserr ("(libev) port_associate");
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}
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}
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static void
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port_modify (EV_P_ int fd, int oev, int nev)
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{
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/* we need to reassociate no matter what, as closes are
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* once more silently being discarded.
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*/
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if (!nev)
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{
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if (oev)
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port_dissociate (backend_fd, PORT_SOURCE_FD, fd);
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}
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else
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port_associate_and_check (EV_A_ fd, nev);
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}
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static void
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port_poll (EV_P_ ev_tstamp timeout)
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{
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int res, i;
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struct timespec ts;
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uint_t nget = 1;
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/* we initialise this to something we will skip in the loop, as */
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/* port_getn can return with nget unchanged, but no indication */
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/* whether it was the original value or has been updated :/ */
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port_events [0].portev_source = 0;
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EV_RELEASE_CB;
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EV_TS_SET (ts, timeout);
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res = port_getn (backend_fd, port_events, port_eventmax, &nget, &ts);
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EV_ACQUIRE_CB;
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/* port_getn may or may not set nget on error */
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/* so we rely on port_events [0].portev_source not being updated */
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if (res == -1 && errno != ETIME && errno != EINTR)
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ev_syserr ("(libev) port_getn (see http://bugs.opensolaris.org/view_bug.do?bug_id=6268715, try LIBEV_FLAGS=3 env variable)");
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for (i = 0; i < nget; ++i)
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{
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if (port_events [i].portev_source == PORT_SOURCE_FD)
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{
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int fd = port_events [i].portev_object;
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fd_event (
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EV_A_
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fd,
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(port_events [i].portev_events & (POLLOUT | POLLERR | POLLHUP) ? EV_WRITE : 0)
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| (port_events [i].portev_events & (POLLIN | POLLERR | POLLHUP) ? EV_READ : 0)
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);
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fd_change (EV_A_ fd, EV__IOFDSET);
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}
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}
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if (expect_false (nget == port_eventmax))
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{
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ev_free (port_events);
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port_eventmax = array_nextsize (sizeof (port_event_t), port_eventmax, port_eventmax + 1);
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port_events = (port_event_t *)ev_malloc (sizeof (port_event_t) * port_eventmax);
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}
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}
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inline_size
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int
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port_init (EV_P_ int flags)
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{
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/* Initialize the kernel queue */
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if ((backend_fd = port_create ()) < 0)
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return 0;
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assert (("libev: PORT_SOURCE_FD must not be zero", PORT_SOURCE_FD));
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fcntl (backend_fd, F_SETFD, FD_CLOEXEC); /* not sure if necessary, hopefully doesn't hurt */
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/* if my reading of the opensolaris kernel sources are correct, then
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* opensolaris does something very stupid: it checks if the time has already
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* elapsed and doesn't round up if that is the case,m otherwise it DOES round
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* up. Since we can't know what the case is, we need to guess by using a
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* "large enough" timeout. Normally, 1e-9 would be correct.
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*/
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backend_mintime = 1e-3; /* needed to compensate for port_getn returning early */
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backend_modify = port_modify;
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backend_poll = port_poll;
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port_eventmax = 64; /* initial number of events receivable per poll */
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port_events = (port_event_t *)ev_malloc (sizeof (port_event_t) * port_eventmax);
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return EVBACKEND_PORT;
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}
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inline_size
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void
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port_destroy (EV_P)
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{
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ev_free (port_events);
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}
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inline_size
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void
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port_fork (EV_P)
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{
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close (backend_fd);
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while ((backend_fd = port_create ()) < 0)
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ev_syserr ("(libev) port");
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fcntl (backend_fd, F_SETFD, FD_CLOEXEC);
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/* re-register interest in fds */
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fd_rearm_all (EV_A);
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}
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