/* * 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 <assert.h> #ifndef WIN32 # include <sys/time.h> #endif #ifdef EV_EVENT_H # include EV_EVENT_H #else # include "event.h" #endif #if EV_MULTIPLICITY # define dLOOPev struct ev_loop *loop = (struct ev_loop *)ev->ev_base # define dLOOPbase struct ev_loop *loop = (struct ev_loop *)base #else # define dLOOPev # define dLOOPbase #endif /* never accessed, will always be cast from/to ev_loop */ struct event_base { int dummy; }; static struct event_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_MULTIPLICITY if (x_cur) x_cur = (struct event_base *)ev_loop_new (EVFLAG_AUTO); else x_cur = (struct event_base *)ev_default_loop (EVFLAG_AUTO); #else assert (("multiple event bases not supported when not compiled with EV_MULTIPLICITY", !x_cur)); x_cur = (struct event_base *)(long)ev_default_loop (EVFLAG_AUTO); #endif return x_cur; } void event_base_free (struct event_base *base) { dLOOPbase; #if EV_MULTIPLICITY if (ev_default_loop (EVMETHOD_AUTO) != loop) ev_loop_destroy (loop); #endif } int event_dispatch (void) { return event_base_dispatch (x_cur); } #ifdef EV_STANDALONE void event_set_log_callback (event_log_cb cb) { /* nop */ } #endif int event_loop (int flags) { return event_base_loop (x_cur, flags); } int event_loopexit (struct timeval *tv) { return event_base_loopexit (x_cur, tv); } static void x_cb (struct event *ev, int revents) { revents &= EV_READ | EV_WRITE | EV_TIMEOUT | EV_SIGNAL; ev->ev_res = revents; ev->ev_callback (ev->ev_fd, (short)revents, ev->ev_arg); } static void x_cb_sig (EV_P_ struct ev_signal *w, int revents) { struct event *ev = (struct event *)(((char *)w) - offsetof (struct event, iosig.sig)); if (revents & EV_ERROR) event_del (ev); x_cb (ev, revents); } static void x_cb_io (EV_P_ struct ev_io *w, int revents) { struct event *ev = (struct event *)(((char *)w) - offsetof (struct event, iosig.io)); if (revents & EV_ERROR) event_del (ev); else if (!(ev->ev_events & EV_PERSIST) && ev_is_active (w)) { ev_io_stop (EV_A_ w); ev->ev_flags &= ~EVLIST_INSERTED; } x_cb (ev, revents); } static void x_cb_to (EV_P_ struct ev_timer *w, int revents) { struct event *ev = (struct event *)(((char *)w) - offsetof (struct event, to)); event_del (ev); x_cb (ev, revents); } void event_set (struct event *ev, int fd, short events, void (*cb)(int, short, void *), void *arg) { if (events & EV_SIGNAL) ev_init (&ev->iosig.sig, x_cb_sig); else ev_init (&ev->iosig.io, x_cb_io); ev_init (&ev->to, x_cb_to); ev->ev_base = x_cur; /* not threadsafe, but its like libevent works */ ev->ev_fd = fd; ev->ev_events = events; ev->ev_pri = 0; ev->ev_callback = cb; ev->ev_arg = arg; ev->ev_res = 0; ev->ev_flags = EVLIST_INIT; } int event_once (int fd, short events, void (*cb)(int, short, void *), void *arg, struct timeval *tv) { return event_base_once (x_cur, fd, events, cb, arg, tv); } int event_add (struct event *ev, struct timeval *tv) { dLOOPev; /* disable all watchers */ event_del (ev); if (ev->ev_events & EV_SIGNAL) { ev_signal_set (&ev->iosig.sig, ev->ev_fd); ev_signal_start (EV_A_ &ev->iosig.sig); ev->ev_flags |= EVLIST_SIGNAL; } else if (ev->ev_events & (EV_READ | EV_WRITE)) { ev_io_set (&ev->iosig.io, ev->ev_fd, ev->ev_events & (EV_READ | EV_WRITE)); ev_io_start (EV_A_ &ev->iosig.io); ev->ev_flags |= EVLIST_INSERTED; } if (tv) { ev_timer_set (&ev->to, tv_get (tv), 0.); ev_timer_start (EV_A_ &ev->to); ev->ev_flags |= EVLIST_TIMEOUT; } ev->ev_flags |= EVLIST_ACTIVE; return 0; } int event_del (struct event *ev) { dLOOPev; if (ev->ev_events & EV_SIGNAL) { /* sig */ if (ev_is_active (&ev->iosig.sig)) ev_signal_stop (EV_A_ &ev->iosig.sig); } else if (ev->ev_events & (EV_READ | EV_WRITE)) { /* io */ if (ev_is_active (&ev->iosig.io)) ev_io_stop (EV_A_ &ev->iosig.io); } if (ev_is_active (&ev->to)) ev_timer_stop (EV_A_ &ev->to); ev->ev_flags = EVLIST_INIT; return 0; } void event_active (struct event *ev, int res, short ncalls) { dLOOPev; if (res & EV_TIMEOUT) ev_feed_event (EV_A_ &ev->to, res & EV_TIMEOUT); if (res & EV_SIGNAL) ev_feed_event (EV_A_ &ev->iosig.sig, res & EV_SIGNAL); if (res & (EV_READ | EV_WRITE)) ev_feed_event (EV_A_ &ev->iosig.io, res & (EV_READ | EV_WRITE)); } int event_pending (struct event *ev, short events, struct timeval *tv) { short revents = 0; dLOOPev; if (ev->ev_events & EV_SIGNAL) { /* sig */ if (ev_is_active (&ev->iosig.sig) || ev_is_pending (&ev->iosig.sig)) revents |= EV_SIGNAL; } else if (ev->ev_events & (EV_READ | EV_WRITE)) { /* io */ if (ev_is_active (&ev->iosig.io) || ev_is_pending (&ev->iosig.io)) revents |= ev->ev_events & (EV_READ | EV_WRITE); } if (ev->ev_events & EV_TIMEOUT || ev_is_active (&ev->to) || ev_is_pending (&ev->to)) { revents |= EV_TIMEOUT; if (tv) tv_set (tv, ev_now (EV_A)); /* not sure if this is right :) */ } 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) { dLOOPbase; ev_loop (EV_A_ flags); return 0; } int event_base_dispatch (struct event_base *base) { return event_base_loop (base, 0); } static void x_loopexit_cb (int revents, void *base) { dLOOPbase; ev_unloop (EV_A_ EVUNLOOP_ONCE); } int event_base_loopexit (struct event_base *base, struct timeval *tv) { ev_tstamp after = tv_get (tv); dLOOPbase; ev_once (EV_A_ -1, 0, after >= 0. ? after : 0., x_loopexit_cb, (void *)base); return -1; } 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 = (struct x_once *)arg; once->cb (once->fd, (short)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 = (struct x_once *)malloc (sizeof (struct x_once)); dLOOPbase; if (!once) return -1; once->fd = fd; once->cb = cb; once->arg = arg; ev_once (EV_A_ 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) { /*dLOOPbase;*/ return 0; }