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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 & (EV_READ | EV_WRITE)); |
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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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