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Marc Alexander Lehmann
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LICENSE
9
LICENSE
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@ -21,3 +21,12 @@ DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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NOTE: parts of the library might be under a different license:
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* event.h is same license as above, but is closely modelled after libevent,
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so its license might apply even though its not obviously derived from it
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(it's the 3-clause bsd license).
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* evdns.c is under public domain (so it says) but was taken out of libevent,
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so its license might apply.
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@ -0,0 +1,347 @@
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/*
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* libevent compatibility layer
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*
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* Copyright (c) 2007 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
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* modification, are permitted provided that the following conditions are
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* met:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* * Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials provided
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* with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <stddef.h>
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#include <stdlib.h>
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#include <sys/time.h>
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#include "event.h"
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struct event_base
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{
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int dummy;
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};
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static int x_actives;
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static struct event_base x_base, *x_cur;
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static void
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tv_set (struct timeval *tv, ev_tstamp at)
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{
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tv->tv_sec = (long)at;
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tv->tv_usec = (long)((at - (ev_tstamp)tv->tv_sec) * 1e6);
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}
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static ev_tstamp
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tv_get (struct timeval *tv)
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{
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if (tv)
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return tv->tv_sec + tv->tv_usec * 1e-6;
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else
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return -1.;
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}
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#define EVENT_VERSION(a,b) # a "." # b
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const char *event_get_version (void)
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{
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return EVENT_VERSION (EV_VERSION_MAJOR, EV_VERSION_MINOR);
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}
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const char *event_get_method (void)
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{
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return "libev";
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}
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void *event_init (void)
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{
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if (ev_init (0))
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return x_cur = &x_base;
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return 0;
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}
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void event_base_free (struct event_base *base)
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{
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/* nop */
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}
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int event_dispatch (void)
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{
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return event_base_dispatch (x_cur);
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}
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void event_set_log_callback (event_log_cb cb)
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{
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/* nop */
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}
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int event_loop (int flags)
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{
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return event_base_loop (x_cur, flags);
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}
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int event_loopexit (struct timeval *tv)
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{
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event_base_loopexit (x_cur, tv);
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}
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static void
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x_cb (struct event *ev, int revents)
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{
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if (ev_is_active (&ev->sig))
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{
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ev_signal_stop (&ev->sig);
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--x_actives;
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}
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if (!(ev->ev_events & EV_PERSIST) && ev_is_active (&ev->io))
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{
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ev_io_stop (&ev->io);
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--x_actives;
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}
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revents &= EV_READ | EV_WRITE | EV_TIMEOUT | EV_SIGNAL;
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if (revents & EV_TIMEOUT)
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--x_actives;
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ev->ev_res = revents;
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ev->ev_callback (ev->ev_fd, revents, ev->ev_arg);
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}
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static void
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x_cb_io (struct ev_io *w, int revents)
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{
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x_cb ((struct event *)(((char *)w) - offsetof (struct event, io)), revents);
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}
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static void
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x_cb_to (struct ev_timer *w, int revents)
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{
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x_cb ((struct event *)(((char *)w) - offsetof (struct event, to)), revents);
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}
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static void
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x_cb_sig (struct ev_signal *w, int revents)
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{
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x_cb ((struct event *)(((char *)w) - offsetof (struct event, sig)), revents);
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}
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void event_set (struct event *ev, int fd, short events, void (*cb)(int, short, void *), void *arg)
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{
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ev_watcher_init (&ev->io, x_cb_io);
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ev_watcher_init (&ev->to, x_cb_to);
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ev_watcher_init (&ev->sig, x_cb_sig);
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ev->ev_base = x_cur;
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ev->ev_fd = fd;
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ev->ev_events = events;
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ev->ev_pri = 0;
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ev->ev_callback = cb;
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ev->ev_arg = arg;
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ev->ev_res = 0;
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}
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int event_once (int fd, short events, void (*cb)(int, short, void *), void *arg, struct timeval *tv)
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{
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event_base_once (x_cur, fd, events, cb, arg, tv);
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}
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int event_add (struct event *ev, struct timeval *tv)
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{
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if (tv)
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{
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if (ev_is_active (&ev->to))
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{
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ev_timer_stop (&ev->to);
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--x_actives;
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}
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ev_timer_set (&ev->to, tv_get (tv), 0.);
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ev_timer_start (&ev->to);
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++x_actives;
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}
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if (ev->ev_events & (EV_READ|EV_WRITE))
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{
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if (ev_is_active (&ev->io))
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{
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ev_io_stop (&ev->io);
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--x_actives;
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}
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ev_io_set (&ev->io, ev->ev_fd, ev->ev_events);
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ev_io_start (&ev->io);
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++x_actives;
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}
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if (ev->ev_events & EV_SIGNAL)
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{
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if (ev_is_active (&ev->sig))
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{
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ev_signal_stop (&ev->sig);
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--x_actives;
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}
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ev_signal_set (&ev->sig, ev->ev_fd);
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ev_signal_start (&ev->sig);
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++x_actives;
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}
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return 0;
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}
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int event_del (struct event *ev)
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{
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if (ev_is_active (&ev->io))
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{
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ev_io_stop (&ev->io);
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--x_actives;
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}
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if (ev_is_active (&ev->to))
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{
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ev_timer_stop (&ev->to);
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--x_actives;
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}
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if (ev_is_active (&ev->sig))
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{
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ev_signal_stop (&ev->sig);
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--x_actives;
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}
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return 0;
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}
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void event_active (struct event *ev, int fd, short events)
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{
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/* unclear what this does, likely internal-use */
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}
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int event_pending (struct event *ev, short events, struct timeval *tv)
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{
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short revents;
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if (ev->io.pending)
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revents |= ev->ev_events & (EV_READ | EV_WRITE);
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if (ev->to.pending)
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{
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revents |= EV_TIMEOUT;
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if (tv)
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tv_set (tv, ev_now); /* not sure if this is right :) */
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}
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if (ev->sig.pending)
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revents |= EV_SIGNAL;
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return events & revents;
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}
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int event_priority_init (int npri)
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{
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return event_base_priority_init (x_cur, npri);
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}
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int event_priority_set (struct event *ev, int pri)
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{
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ev->ev_pri = pri;
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return 0;
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}
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int event_base_set (struct event_base *base, struct event *ev)
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{
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ev->ev_base = base;
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return 0;
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}
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int event_base_loop (struct event_base *base, int flags)
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{
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do
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{
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ev_loop (flags | EVLOOP_ONESHOT);
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}
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while (!(flags & (EVLOOP_ONESHOT | EVLOOP_NONBLOCK)) && x_actives && !ev_loop_done);
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return 0;
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}
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int event_base_dispatch (struct event_base *base)
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{
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return event_base_loop (base, 0);
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}
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static void
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x_loopexit_cb (int revents, void *arg)
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{
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ev_loop_done = 2;
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}
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int event_base_loopexit (struct event_base *base, struct timeval *tv)
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{
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ev_tstamp after = tv_get (tv);
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ev_once (-1, 0, after >= 0. ? after : 0., x_loopexit_cb, (void *)base);
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}
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struct x_once
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{
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int fd;
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void (*cb)(int, short, void *);
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void *arg;
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};
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static void
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x_once_cb (int revents, void *arg)
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{
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struct x_once *once = arg;
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once->cb (once->fd, revents, once->arg);
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free (once);
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}
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int event_base_once (struct event_base *base, int fd, short events, void (*cb)(int, short, void *), void *arg, struct timeval *tv)
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{
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struct x_once *once = malloc (sizeof (struct x_once));
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if (!once)
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return -1;
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once->fd = fd;
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once->cb = cb;
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once->arg = arg;
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ev_once (fd, events & (EV_READ|EV_WRITE), tv_get (tv), x_once_cb, (void *)once);
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return 0;
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}
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int event_base_priority_init (struct event_base *base, int npri)
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{
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return 0;
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}
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