353 lines
7.9 KiB
C
353 lines
7.9 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307
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* USA
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*
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* $Id: event.c 498 2006-01-15 16:40:33Z jilles $
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*/
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/*
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* How its used:
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*
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* Should be pretty self-explanatory. Events are added to the static
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* array event_table with a frequency time telling eventRun how often
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* to execute it.
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*/
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#include "stdinc.h"
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#include "config.h"
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#include "ircd.h"
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#include "event.h"
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#include "client.h"
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#include "send.h"
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#include "memory.h"
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#include "s_log.h"
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#include "numeric.h"
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static const char *last_event_ran = NULL;
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struct ev_entry event_table[MAX_EVENTS];
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static time_t event_time_min = -1;
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/*
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* void eventAdd(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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void
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eventAdd(const char *name, EVH * func, void *arg, time_t when)
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{
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int i;
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/* find first inactive index */
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for (i = 0; i < MAX_EVENTS; i++)
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{
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if(event_table[i].active == 0)
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{
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event_table[i].func = func;
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event_table[i].name = name;
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event_table[i].arg = arg;
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event_table[i].when = CurrentTime + when;
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event_table[i].frequency = when;
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event_table[i].active = 1;
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if((event_table[i].when < event_time_min) || (event_time_min == -1))
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event_time_min = event_table[i].when;
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return;
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}
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}
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/* erk! couldnt add to event table */
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sendto_realops_snomask(SNO_DEBUG, L_ALL, "Unable to add event [%s] to event table", name);
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}
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void
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eventAddOnce(const char *name, EVH *func, void *arg, time_t when)
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{
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int i;
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/* find first inactive index */
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for (i = 0; i < MAX_EVENTS; i++)
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{
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if(event_table[i].active == 0)
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{
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event_table[i].func = func;
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event_table[i].name = name;
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event_table[i].arg = arg;
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event_table[i].when = CurrentTime + when;
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event_table[i].frequency = 0;
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event_table[i].active = 1;
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if ((event_table[i].when < event_time_min) || (event_time_min == -1))
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event_time_min = event_table[i].when;
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return;
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}
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}
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/* erk! couldnt add to event table */
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sendto_realops_snomask(SNO_DEBUG, L_ALL,
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"Unable to add event [%s] to event table", name);
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}
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/*
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* void eventDelete(EVH *func, void *arg)
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*
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* Input: Function handler, argument that was passed.
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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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eventDelete(EVH * func, void *arg)
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{
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int i;
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i = eventFind(func, arg);
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if(i == -1)
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return;
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event_table[i].name = NULL;
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event_table[i].func = NULL;
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event_table[i].arg = NULL;
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event_table[i].active = 0;
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}
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/*
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* void eventAddIsh(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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void
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eventAddIsh(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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eventAdd(name, func, arg, delta_ish);
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}
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/*
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* void eventRun(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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eventRun(void)
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{
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int i;
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for (i = 0; i < MAX_EVENTS; i++)
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{
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if(event_table[i].active && (event_table[i].when <= CurrentTime))
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{
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last_event_ran = event_table[i].name;
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event_table[i].func(event_table[i].arg);
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event_time_min = -1;
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/* event is scheduled more than once */
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if(event_table[i].frequency)
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event_table[i].when = CurrentTime + event_table[i].frequency;
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else
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{
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event_table[i].name = NULL;
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event_table[i].func = NULL;
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event_table[i].arg = NULL;
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event_table[i].active = 0;
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}
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}
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}
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}
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/*
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* time_t eventNextTime(void)
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*
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* Input: None
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* Output: Specifies the next time eventRun() should be run
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* Side Effects: None
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*/
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time_t
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eventNextTime(void)
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{
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int i;
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if(event_time_min == -1)
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{
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for (i = 0; i < MAX_EVENTS; i++)
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{
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if(event_table[i].active &&
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((event_table[i].when < event_time_min) || (event_time_min == -1)))
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event_time_min = event_table[i].when;
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}
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}
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return event_time_min;
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}
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/*
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* void eventInit(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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eventInit(void)
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{
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last_event_ran = NULL;
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memset((void *) event_table, 0, sizeof(event_table));
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}
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/*
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* int eventFind(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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int
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eventFind(EVH * func, void *arg)
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{
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int i;
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for (i = 0; i < MAX_EVENTS; i++)
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{
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if((event_table[i].func == func) &&
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(event_table[i].arg == arg) && event_table[i].active)
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return i;
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}
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return -1;
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}
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/*
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* void show_events(struct Client *source_p)
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*
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* Input: Client requesting the event
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* Output: List of events
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* Side Effects: None
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*/
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void
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show_events(struct Client *source_p)
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{
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int i;
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if(last_event_ran)
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sendto_one_numeric(source_p, RPL_STATSDEBUG,
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"E :Last event to run: %s",
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last_event_ran);
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sendto_one_numeric(source_p, RPL_STATSDEBUG,
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"E :Operation Next Execution");
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for (i = 0; i < MAX_EVENTS; i++)
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{
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if(event_table[i].active)
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{
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sendto_one_numeric(source_p, RPL_STATSDEBUG,
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"E :%-28s %-4d seconds",
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event_table[i].name,
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(int)(event_table[i].when - CurrentTime));
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}
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}
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}
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/*
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* void 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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set_back_events(time_t by)
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{
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int i;
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for (i = 0; i < MAX_EVENTS; i++)
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{
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if(event_table[i].when > by)
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event_table[i].when -= by;
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else
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event_table[i].when = 0;
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}
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}
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void
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eventUpdate(const char *name, time_t freq)
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{
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int i;
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for(i = 0; i < MAX_EVENTS; i++)
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{
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if(event_table[i].active &&
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!irccmp(event_table[i].name, name))
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{
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event_table[i].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((CurrentTime + freq) < event_table[i].when)
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event_table[i].when = CurrentTime + freq;
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return;
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}
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}
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}
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