diff options
Diffstat (limited to 'event.c')
| -rw-r--r-- | event.c | 347 |
1 files changed, 347 insertions, 0 deletions
@@ -0,0 +1,347 @@ +/* + * libevent compatibility layer + * + * Copyright (c) 2007 Marc Alexander Lehmann <libev@schmorp.de> + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are + * met: + * + * * Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * + * * 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 COPYRIGHT HOLDERS AND CONTRIBUTORS + * "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 COPYRIGHT + * OWNER OR CONTRIBUTORS 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 <stddef.h> +#include <stdlib.h> +#include <sys/time.h> + +#include "event.h" + +struct event_base +{ + int dummy; +}; + +static int x_actives; + +static struct event_base x_base, *x_cur; + +static void +tv_set (struct timeval *tv, ev_tstamp at) +{ + tv->tv_sec = (long)at; + tv->tv_usec = (long)((at - (ev_tstamp)tv->tv_sec) * 1e6); +} + +static ev_tstamp +tv_get (struct timeval *tv) +{ + if (tv) + return tv->tv_sec + tv->tv_usec * 1e-6; + else + return -1.; +} + +#define EVENT_VERSION(a,b) # a "." # b + +const char *event_get_version (void) +{ + return EVENT_VERSION (EV_VERSION_MAJOR, EV_VERSION_MINOR); +} + +const char *event_get_method (void) +{ + return "libev"; +} + +void *event_init (void) +{ + if (ev_init (0)) + return x_cur = &x_base; + + return 0; +} + +void event_base_free (struct event_base *base) +{ + /* nop */ +} + +int event_dispatch (void) +{ + return event_base_dispatch (x_cur); +} + +void event_set_log_callback (event_log_cb cb) +{ + /* nop */ +} + +int event_loop (int flags) +{ + return event_base_loop (x_cur, flags); +} + +int event_loopexit (struct timeval *tv) +{ + event_base_loopexit (x_cur, tv); +} + +static void +x_cb (struct event *ev, int revents) +{ + if (ev_is_active (&ev->sig)) + { + ev_signal_stop (&ev->sig); + --x_actives; + } + + if (!(ev->ev_events & EV_PERSIST) && ev_is_active (&ev->io)) + { + ev_io_stop (&ev->io); + --x_actives; + } + + revents &= EV_READ | EV_WRITE | EV_TIMEOUT | EV_SIGNAL; + + if (revents & EV_TIMEOUT) + --x_actives; + + ev->ev_res = revents; + ev->ev_callback (ev->ev_fd, revents, ev->ev_arg); +} + +static void +x_cb_io (struct ev_io *w, int revents) +{ + x_cb ((struct event *)(((char *)w) - offsetof (struct event, io)), revents); +} + +static void +x_cb_to (struct ev_timer *w, int revents) +{ + x_cb ((struct event *)(((char *)w) - offsetof (struct event, to)), revents); +} + +static void +x_cb_sig (struct ev_signal *w, int revents) +{ + x_cb ((struct event *)(((char *)w) - offsetof (struct event, sig)), revents); +} + +void event_set (struct event *ev, int fd, short events, void (*cb)(int, short, void *), void *arg) +{ + ev_watcher_init (&ev->io, x_cb_io); + ev_watcher_init (&ev->to, x_cb_to); + ev_watcher_init (&ev->sig, x_cb_sig); + + ev->ev_base = x_cur; + ev->ev_fd = fd; + ev->ev_events = events; + ev->ev_pri = 0; + ev->ev_callback = cb; + ev->ev_arg = arg; + ev->ev_res = 0; +} + +int event_once (int fd, short events, void (*cb)(int, short, void *), void *arg, struct timeval *tv) +{ + event_base_once (x_cur, fd, events, cb, arg, tv); +} + +int event_add (struct event *ev, struct timeval *tv) +{ + if (tv) + { + if (ev_is_active (&ev->to)) + { + ev_timer_stop (&ev->to); + --x_actives; + } + + ev_timer_set (&ev->to, tv_get (tv), 0.); + ev_timer_start (&ev->to); + ++x_actives; + } + + if (ev->ev_events & (EV_READ|EV_WRITE)) + { + if (ev_is_active (&ev->io)) + { + ev_io_stop (&ev->io); + --x_actives; + } + + ev_io_set (&ev->io, ev->ev_fd, ev->ev_events); + ev_io_start (&ev->io); + ++x_actives; + } + + if (ev->ev_events & EV_SIGNAL) + { + if (ev_is_active (&ev->sig)) + { + ev_signal_stop (&ev->sig); + --x_actives; + } + + ev_signal_set (&ev->sig, ev->ev_fd); + ev_signal_start (&ev->sig); + ++x_actives; + } + + return 0; +} + +int event_del (struct event *ev) +{ + if (ev_is_active (&ev->io)) + { + ev_io_stop (&ev->io); + --x_actives; + } + + if (ev_is_active (&ev->to)) + { + ev_timer_stop (&ev->to); + --x_actives; + } + + if (ev_is_active (&ev->sig)) + { + ev_signal_stop (&ev->sig); + --x_actives; + } + + return 0; +} + +void event_active (struct event *ev, int fd, short events) +{ + /* unclear what this does, likely internal-use */ +} + +int event_pending (struct event *ev, short events, struct timeval *tv) +{ + short revents; + + if (ev->io.pending) + revents |= ev->ev_events & (EV_READ | EV_WRITE); + + if (ev->to.pending) + { + revents |= EV_TIMEOUT; + + if (tv) + tv_set (tv, ev_now); /* not sure if this is right :) */ + } + + if (ev->sig.pending) + revents |= EV_SIGNAL; + + return events & revents; +} + +int event_priority_init (int npri) +{ + return event_base_priority_init (x_cur, npri); +} + +int event_priority_set (struct event *ev, int pri) +{ + ev->ev_pri = pri; + + return 0; +} + +int event_base_set (struct event_base *base, struct event *ev) +{ + ev->ev_base = base; + + return 0; +} + +int event_base_loop (struct event_base *base, int flags) +{ + do + { + ev_loop (flags | EVLOOP_ONESHOT); + } + while (!(flags & (EVLOOP_ONESHOT | EVLOOP_NONBLOCK)) && x_actives && !ev_loop_done); + + return 0; +} + +int event_base_dispatch (struct event_base *base) +{ + return event_base_loop (base, 0); +} + +static void +x_loopexit_cb (int revents, void *arg) +{ + ev_loop_done = 2; +} + +int event_base_loopexit (struct event_base *base, struct timeval *tv) +{ + ev_tstamp after = tv_get (tv); + + ev_once (-1, 0, after >= 0. ? after : 0., x_loopexit_cb, (void *)base); +} + +struct x_once +{ + int fd; + void (*cb)(int, short, void *); + void *arg; +}; + +static void +x_once_cb (int revents, void *arg) +{ + struct x_once *once = arg; + + once->cb (once->fd, revents, once->arg); + free (once); +} + +int event_base_once (struct event_base *base, int fd, short events, void (*cb)(int, short, void *), void *arg, struct timeval *tv) +{ + struct x_once *once = malloc (sizeof (struct x_once)); + + if (!once) + return -1; + + once->fd = fd; + once->cb = cb; + once->arg = arg; + + ev_once (fd, events & (EV_READ|EV_WRITE), tv_get (tv), x_once_cb, (void *)once); + + return 0; +} + +int event_base_priority_init (struct event_base *base, int npri) +{ + return 0; +} + |