/* * libevent compatibility layer * * Copyright (c) 2007,2008,2009,2010,2012 Marc Alexander Lehmann * All rights reserved. * * Redistribution and use in source and binary forms, with or without modifica- * tion, 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 MER- * CHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPE- * CIAL, 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 OTH- * ERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED * OF THE POSSIBILITY OF SUCH DAMAGE. * * Alternatively, the contents of this file may be used under the terms of * the GNU General Public License ("GPL") version 2 or any later version, * in which case the provisions of the GPL are applicable instead of * the above. If you wish to allow the use of your version of this file * only under the terms of the GPL and not to allow others to use your * version of this file under the BSD license, indicate your decision * by deleting the provisions above and replace them with the notice * and other provisions required by the GPL. If you do not delete the * provisions above, a recipient may use your version of this file under * either the BSD or the GPL. */ #include #include #include #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 *ev_x_cur; static ev_tstamp ev_tv_get (struct timeval *tv) { if (tv) { ev_tstamp after = tv->tv_sec + tv->tv_usec * 1e-6; return after ? after : 1e-6; } else return -1.; } #define EVENT_STRINGIFY(s) # s #define EVENT_VERSION(a,b) EVENT_STRINGIFY (a) "." EVENT_STRINGIFY (b) const char * event_get_version (void) { /* returns ABI, not API or library, version */ 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 (ev_x_cur) ev_x_cur = (struct event_base *)ev_loop_new (EVFLAG_AUTO); else ev_x_cur = (struct event_base *)ev_default_loop (EVFLAG_AUTO); #else assert (("libev: multiple event bases not supported when not compiled with EV_MULTIPLICITY", !ev_x_cur)); ev_x_cur = (struct event_base *)(long)ev_default_loop (EVFLAG_AUTO); #endif return ev_x_cur; } const char * event_base_get_method (const struct event_base *base) { return "libev"; } struct event_base * event_base_new (void) { #if EV_MULTIPLICITY return (struct event_base *)ev_loop_new (EVFLAG_AUTO); #else assert (("libev: multiple event bases not supported when not compiled with EV_MULTIPLICITY")); return NULL; #endif } void event_base_free (struct event_base *base) { dLOOPbase; #if EV_MULTIPLICITY if (!ev_is_default_loop (loop)) ev_loop_destroy (loop); #endif } int event_dispatch (void) { return event_base_dispatch (ev_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 (ev_x_cur, flags); } int event_loopexit (struct timeval *tv) { return event_base_loopexit (ev_x_cur, tv); } event_callback_fn event_get_callback (const struct event *ev) { return ev->ev_callback; } static void ev_x_cb (struct event *ev, int revents) { revents &= EV_READ | EV_WRITE | EV_TIMER | EV_SIGNAL; ev->ev_res = revents; ev->ev_callback (ev->ev_fd, (short)revents, ev->ev_arg); } static void ev_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); ev_x_cb (ev, revents); } static void ev_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) || !(ev->ev_events & EV_PERSIST)) event_del (ev); ev_x_cb (ev, revents); } static void ev_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); 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, ev_x_cb_sig); else ev_init (&ev->iosig.io, ev_x_cb_io); ev_init (&ev->to, ev_x_cb_to); ev->ev_base = ev_x_cur; /* not threadsafe, but it's how 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 (ev_x_cur, fd, events, cb, arg, tv); } int event_add (struct event *ev, struct timeval *tv) { dLOOPev; if (ev->ev_events & EV_SIGNAL) { if (!ev_is_active (&ev->iosig.sig)) { 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)) { if (!ev_is_active (&ev->iosig.io)) { 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->to.repeat = ev_tv_get (tv); ev_timer_again (EV_A_ &ev->to); ev->ev_flags |= EVLIST_TIMEOUT; } else { ev_timer_stop (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) ev_signal_stop (EV_A_ &ev->iosig.sig); else if (ev->ev_events & (EV_READ | EV_WRITE)) 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) { ev_tstamp at = ev_now (EV_A); tv->tv_sec = (long)at; tv->tv_usec = (long)((at - (ev_tstamp)tv->tv_sec) * 1e6); } } return events & revents; } int event_priority_init (int npri) { return event_base_priority_init (ev_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; return !ev_run (EV_A_ flags); } int event_base_dispatch (struct event_base *base) { return event_base_loop (base, 0); } static void ev_x_loopexit_cb (int revents, void *base) { dLOOPbase; ev_break (EV_A_ EVBREAK_ONE); } int event_base_loopexit (struct event_base *base, struct timeval *tv) { ev_tstamp after = ev_tv_get (tv); dLOOPbase; ev_once (EV_A_ -1, 0, after >= 0. ? after : 0., ev_x_loopexit_cb, (void *)base); return 0; } struct ev_x_once { int fd; void (*cb)(int, short, void *); void *arg; }; static void ev_x_once_cb (int revents, void *arg) { struct ev_x_once *once = (struct ev_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 ev_x_once *once = (struct ev_x_once *)malloc (sizeof (struct ev_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), ev_tv_get (tv), ev_x_once_cb, (void *)once); return 0; } int event_base_priority_init (struct event_base *base, int npri) { /*dLOOPbase;*/ return 0; }