/* * Copyright 2007 Marc Alexander Lehmann <libev@schmorp.de> * * Redistribution and use in source and binary forms, with or without * modification, 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 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, * 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. */ #include <sys/types.h> #include <sys/time.h> #include <poll.h> #include <port.h> #include <string.h> #include <errno.h> 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 (port_fd, PORT_SOURCE_FD, fd); } else if (0 > port_associate ( port_fd, PORT_SOURCE_FD, fd, (nev & EV_READ ? POLLIN : 0) | (nev & EV_WRITE ? POLLOUT : 0), 0 ) ) { if (errno == EBADFD) fd_kill (EV_A_ fd); else syserr ("(libev) port_associate"); } } static void port_poll (EV_P_ ev_tstamp timeout) { int res, i; struct timespec ts; uint_t nget = 1; ts.tv_sec = (time_t)timeout; ts.tv_nsec = (long)(timeout - (ev_tstamp)ts.tv_sec) * 1e9; res = port_getn (port_fd, port_events, port_eventmax, &nget, &ts); if (res < 0) { if (errno != EINTR && errno != ETIME) syserr ("(libev) port_getn"); return; } 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) ); anfds [fd].events = 0; /* event received == disassociated */ fd_change (EV_A_ fd); /* need to reify later */ } } if (expect_false (nget == port_eventmax)) { ev_free (port_events); port_eventmax = array_roundsize (port_event_t, port_eventmax << 1); port_events = (port_event_t *)ev_malloc (sizeof (port_event_t) * port_eventmax); } } static int port_init (EV_P_ int flags) { /* Initalize the kernel queue */ if ((port_fd = port_create ()) < 0) return 0; fcntl (port_fd, F_SETFD, FD_CLOEXEC); /* not sure if necessary, hopefully doesn't hurt */ backend_fudge = 1e-3; /* needed to compensate for port_getn returning early */ backend_modify = port_modify; backend_poll = port_poll; port_eventmax = 64; /* intiial number of events receivable per poll */ port_events = (port_event_t *)ev_malloc (sizeof (port_event_t) * port_eventmax); return EVBACKEND_PORT; } static void port_destroy (EV_P) { close (port_fd); ev_free (port_events); } static void port_fork (EV_P) { close (port_fd); while ((port_fd = port_create ()) < 0) syserr ("(libev) port"); fcntl (port_fd, F_SETFD, FD_CLOEXEC); /* re-register interest in fds */ fd_rearm_all (EV_A); }