8db50c03e6
When receiving bans from a bursting server, if kline_delay is set to 0 (the default), rb_event_addonce will be called to schedule an event for 0 seconds in the future. While this works fine for the fallback rb_event_run function, the epoll implementation ends up scheduling a timerfd for the event in the past, which is then never executed. While fixing this, I also made rb_event_add and rb_event_addonce reject attempts to add events scheduled for 0 seconds in the future; they're instead rewritten to run 1 second in the future.
352 lines
8 KiB
C
352 lines
8 KiB
C
/*
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* ircd-ratbox: A slightly useful ircd.
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* event.c: Event functions.
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*
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* Copyright (C) 1998-2000 Regents of the University of California
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* Copyright (C) 2001-2002 Hybrid Development Team
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* Copyright (C) 2002-2005 ircd-ratbox development team
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*
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* Code borrowed from the squid web cache by Adrian Chadd.
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* Original header:
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*
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* DEBUG: section 41 Event Processing
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* AUTHOR: Henrik Nordstrom
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*
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* SQUID Internet Object Cache http://squid.nlanr.net/Squid/
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* ----------------------------------------------------------
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*
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* Squid is the result of efforts by numerous individuals from the
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* Internet community. Development is led by Duane Wessels of the
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* National Laboratory for Applied Network Research and funded by the
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* National Science Foundation. Squid is Copyrighted (C) 1998 by
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* the Regents of the University of California. Please see the
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* COPYRIGHT file for full details. Squid incorporates software
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* developed and/or copyrighted by other sources. Please see the
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* CREDITS file for full details.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301
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* USA
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*
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* $Id: event.c 26272 2008-12-10 05:55:10Z androsyn $
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*/
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#include <libratbox_config.h>
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#include <ratbox_lib.h>
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#include <commio-int.h>
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#include <event-int.h>
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#define EV_NAME_LEN 33
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static char last_event_ran[EV_NAME_LEN];
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static rb_dlink_list event_list;
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static time_t event_time_min = -1;
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/*
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* struct ev_entry *
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* rb_event_find(EVH *func, void *arg)
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*
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* Input: Event function and the argument passed to it
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* Output: Index to the slow in the event_table
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* Side Effects: None
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*/
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static struct ev_entry *
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rb_event_find(EVH * func, void *arg)
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{
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rb_dlink_node *ptr;
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struct ev_entry *ev;
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RB_DLINK_FOREACH(ptr, event_list.head)
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{
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ev = ptr->data;
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if((ev->func == func) && (ev->arg == arg))
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return ev;
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}
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return NULL;
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}
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/*
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* struct ev_entry *
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* rb_event_add(const char *name, EVH *func, void *arg, time_t when)
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*
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* Input: Name of event, function to call, arguments to pass, and frequency
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* of the event.
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* Output: None
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* Side Effects: Adds the event to the event list.
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*/
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struct ev_entry *
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rb_event_add(const char *name, EVH * func, void *arg, time_t when)
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{
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if (rb_unlikely(when <= 0)) {
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rb_lib_log("rb_event_add: tried to schedule %s event with a delay of "
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"%d seconds", name, (int) when);
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when = 1;
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}
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struct ev_entry *ev;
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ev = rb_malloc(sizeof(struct ev_entry));
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ev->func = func;
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ev->name = rb_strndup(name, EV_NAME_LEN);
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ev->arg = arg;
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ev->when = rb_current_time() + when;
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ev->next = when;
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ev->frequency = when;
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if((ev->when < event_time_min) || (event_time_min == -1))
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{
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event_time_min = ev->when;
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}
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rb_dlinkAdd(ev, &ev->node, &event_list);
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rb_io_sched_event(ev, when);
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return ev;
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}
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struct ev_entry *
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rb_event_addonce(const char *name, EVH * func, void *arg, time_t when)
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{
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if (rb_unlikely(when <= 0)) {
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rb_lib_log("rb_event_addonce: tried to schedule %s event to run in "
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"%d seconds", name, (int) when);
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when = 1;
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}
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struct ev_entry *ev;
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ev = rb_malloc(sizeof(struct ev_entry));
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ev->func = func;
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ev->name = rb_strndup(name, EV_NAME_LEN);
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ev->arg = arg;
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ev->when = rb_current_time() + when;
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ev->next = when;
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ev->frequency = 0;
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if((ev->when < event_time_min) || (event_time_min == -1))
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event_time_min = ev->when;
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rb_dlinkAdd(ev, &ev->node, &event_list);
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rb_io_sched_event(ev, when);
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return ev;
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}
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/*
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* void rb_event_delete(struct ev_entry *ev)
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*
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* Input: pointer to ev_entry for the event
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* Output: None
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* Side Effects: Removes the event from the event list
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*/
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void
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rb_event_delete(struct ev_entry *ev)
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{
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if(ev == NULL)
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return;
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rb_dlinkDelete(&ev->node, &event_list);
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rb_io_unsched_event(ev);
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rb_free(ev->name);
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rb_free(ev);
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}
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/*
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* void rb_event_find_delete(EVH *func, void *arg)
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*
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* Input: pointer to func and data
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* Output: None
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* Side Effects: Removes the event from the event list
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*/
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void
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rb_event_find_delete(EVH * func, void *arg)
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{
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rb_event_delete(rb_event_find(func, arg));
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}
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/*
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* struct ev_entry *
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* rb_event_addish(const char *name, EVH *func, void *arg, time_t delta_isa)
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*
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* Input: Name of event, function to call, arguments to pass, and frequency
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* of the event.
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* Output: None
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* Side Effects: Adds the event to the event list within +- 1/3 of the
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* specified frequency.
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*/
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struct ev_entry *
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rb_event_addish(const char *name, EVH * func, void *arg, time_t delta_ish)
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{
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if(delta_ish >= 3.0)
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{
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const time_t two_third = (2 * delta_ish) / 3;
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delta_ish = two_third + ((rand() % 1000) * two_third) / 1000;
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/*
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* XXX I hate the above magic, I don't even know if its right.
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* Grr. -- adrian
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*/
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}
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return rb_event_add(name, func, arg, delta_ish);
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}
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void
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rb_run_event(struct ev_entry *ev)
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{
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rb_strlcpy(last_event_ran, ev->name, sizeof(last_event_ran));
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ev->func(ev->arg);
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if(!ev->frequency)
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{
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rb_event_delete(ev);
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return;
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}
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ev->when = rb_current_time() + ev->frequency;
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if((ev->when < event_time_min) || (event_time_min == -1))
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event_time_min = ev->when;
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}
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/*
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* void rb_event_run(void)
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*
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* Input: None
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* Output: None
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* Side Effects: Runs pending events in the event list
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*/
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void
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rb_event_run(void)
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{
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rb_dlink_node *ptr, *next;
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struct ev_entry *ev;
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if(rb_io_supports_event())
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return;
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event_time_min = -1;
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RB_DLINK_FOREACH_SAFE(ptr, next, event_list.head)
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{
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ev = ptr->data;
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if(ev->when <= rb_current_time())
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{
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rb_strlcpy(last_event_ran, ev->name, sizeof(last_event_ran));
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ev->func(ev->arg);
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/* event is scheduled more than once */
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if(ev->frequency)
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{
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ev->when = rb_current_time() + ev->frequency;
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if((ev->when < event_time_min) || (event_time_min == -1))
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event_time_min = ev->when;
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}
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else
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{
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rb_dlinkDelete(&ev->node, &event_list);
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rb_free(ev);
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}
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}
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else
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{
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if((ev->when < event_time_min) || (event_time_min == -1))
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event_time_min = ev->when;
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}
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}
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}
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void
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rb_event_io_register_all(void)
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{
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rb_dlink_node *ptr;
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struct ev_entry *ev;
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if(!rb_io_supports_event())
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return;
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RB_DLINK_FOREACH(ptr, event_list.head)
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{
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ev = ptr->data;
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rb_io_sched_event(ev, ev->next);
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}
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}
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/*
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* void rb_event_init(void)
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*
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* Input: None
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* Output: None
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* Side Effects: Initializes the event system.
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*/
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void
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rb_event_init(void)
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{
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rb_strlcpy(last_event_ran, "NONE", sizeof(last_event_ran));
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}
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void
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rb_dump_events(void (*func) (char *, void *), void *ptr)
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{
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int len;
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char buf[512];
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rb_dlink_node *dptr;
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struct ev_entry *ev;
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len = sizeof(buf);
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rb_snprintf(buf, len, "Last event to run: %s", last_event_ran);
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func(buf, ptr);
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rb_strlcpy(buf, "Operation Next Execution", len);
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func(buf, ptr);
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RB_DLINK_FOREACH(dptr, event_list.head)
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{
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ev = dptr->data;
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rb_snprintf(buf, len, "%-28s %-4ld seconds", ev->name,
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ev->when - (long)rb_current_time());
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func(buf, ptr);
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}
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}
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/*
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* void rb_set_back_events(time_t by)
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* Input: Time to set back events by.
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* Output: None.
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* Side-effects: Sets back all events by "by" seconds.
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*/
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void
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rb_set_back_events(time_t by)
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{
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rb_dlink_node *ptr;
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struct ev_entry *ev;
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RB_DLINK_FOREACH(ptr, event_list.head)
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{
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ev = ptr->data;
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if(ev->when > by)
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ev->when -= by;
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else
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ev->when = 0;
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}
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}
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void
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rb_event_update(struct ev_entry *ev, time_t freq)
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{
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if(ev == NULL)
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return;
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ev->frequency = freq;
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/* update when its scheduled to run if its higher
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* than the new frequency
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*/
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if((rb_current_time() + freq) < ev->when)
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ev->when = rb_current_time() + freq;
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return;
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}
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time_t
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rb_event_next(void)
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{
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return event_time_min;
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}
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