252 lines
6.1 KiB
C
252 lines
6.1 KiB
C
/*
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* PPP Timer Processing Module
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*
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* Written by Toshiharu OHNO (tony-o@iij.ad.jp)
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*
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* Copyright (C) 1993, Internet Initiative Japan, Inc. All rights reserverd.
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*
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* Redistribution and use in source and binary forms are permitted
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* provided that the above copyright notice and this paragraph are
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* duplicated in all such forms and that any documentation,
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* advertising materials, and other materials related to such
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* distribution and use acknowledge that the software was developed
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* by the Internet Initiative Japan, Inc. The name of the
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* IIJ may not be used to endorse or promote products derived
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* from this software without specific prior written permission.
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
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* WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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*
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* $Id: timer.c,v 1.33 1999/05/09 20:02:28 brian Exp $
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*
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* TODO:
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*/
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#include <errno.h>
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#include <signal.h>
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#include <stdio.h>
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#include <string.h>
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#include <sys/time.h>
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#include <termios.h>
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#include "log.h"
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#include "sig.h"
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#include "timer.h"
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#include "descriptor.h"
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#include "prompt.h"
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static struct pppTimer *TimerList = NULL;
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static void StopTimerNoBlock(struct pppTimer *);
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static const char *
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tState2Nam(u_int state)
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{
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static const char *StateNames[] = { "stopped", "running", "expired" };
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if (state >= sizeof StateNames / sizeof StateNames[0])
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return "unknown";
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return StateNames[state];
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}
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void
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timer_Stop(struct pppTimer *tp)
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{
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int omask;
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omask = sigblock(sigmask(SIGALRM));
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StopTimerNoBlock(tp);
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sigsetmask(omask);
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}
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void
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timer_Start(struct pppTimer *tp)
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{
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struct pppTimer *t, *pt;
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u_long ticks = 0;
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int omask;
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omask = sigblock(sigmask(SIGALRM));
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if (tp->state != TIMER_STOPPED)
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StopTimerNoBlock(tp);
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if (tp->load == 0) {
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log_Printf(LogTIMER, "%s timer[%p] has 0 load!\n", tp->name, tp);
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sigsetmask(omask);
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return;
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}
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pt = NULL;
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for (t = TimerList; t; t = t->next) {
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if (ticks + t->rest >= tp->load)
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break;
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ticks += t->rest;
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pt = t;
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}
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tp->state = TIMER_RUNNING;
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tp->rest = tp->load - ticks;
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if (t)
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log_Printf(LogTIMER, "timer_Start: Inserting %s timer[%p] before %s "
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"timer[%p], delta = %ld\n", tp->name, tp, t->name, t, tp->rest);
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else
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log_Printf(LogTIMER, "timer_Start: Inserting %s timer[%p]\n", tp->name, tp);
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/* Insert given *tp just before *t */
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tp->next = t;
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if (pt) {
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pt->next = tp;
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} else {
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TimerList = tp;
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timer_InitService(0); /* Start the Timer Service */
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}
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if (t)
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t->rest -= tp->rest;
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sigsetmask(omask);
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}
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static void
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StopTimerNoBlock(struct pppTimer *tp)
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{
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struct pppTimer *t, *pt;
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/*
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* A RUNNING timer must be removed from TimerList (->next list).
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* A STOPPED timer isn't in any list, but may have a bogus [e]next field.
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* An EXPIRED timer is in the ->enext list.
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*/
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if (tp->state != TIMER_RUNNING) {
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tp->next = NULL;
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tp->state = TIMER_STOPPED;
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return;
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}
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pt = NULL;
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for (t = TimerList; t != tp && t != NULL; t = t->next)
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pt = t;
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if (t) {
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if (pt) {
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pt->next = t->next;
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} else {
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TimerList = t->next;
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if (TimerList == NULL) /* Last one ? */
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timer_TermService(); /* Terminate Timer Service */
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}
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if (t->next)
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t->next->rest += tp->rest;
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} else
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log_Printf(LogERROR, "Oops, %s timer not found!!\n", tp->name);
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tp->next = NULL;
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tp->state = TIMER_STOPPED;
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}
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static void
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TimerService(void)
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{
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struct pppTimer *tp, *exp, *next;
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if (log_IsKept(LogTIMER)) {
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static time_t t; /* Only show timers globally every second */
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time_t n = time(NULL);
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if (n > t)
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timer_Show(LogTIMER, NULL);
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t = n;
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}
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tp = TimerList;
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if (tp) {
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tp->rest = 0;
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/* Multiple timers might expire at once. Create a list of expired timers */
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exp = NULL;
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do {
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tp->state = TIMER_EXPIRED;
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next = tp->next;
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tp->enext = exp;
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exp = tp;
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tp = next;
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} while (tp && tp->rest == 0);
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TimerList = tp;
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if (TimerList != NULL) /* Any timers remaining ? */
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timer_InitService(1); /* Restart the Timer Service */
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else
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timer_TermService(); /* Stop the Timer Service */
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/* Process all expired timers */
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while (exp) {
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next = exp->enext;
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exp->enext = NULL;
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if (exp->func)
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(*exp->func)(exp->arg);
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exp = next;
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}
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}
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}
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void
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timer_Show(int LogLevel, struct prompt *prompt)
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{
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struct itimerval itimer;
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struct pppTimer *pt;
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u_long rest = 0;
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/* Adjust our first delta so that it reflects what's really happening */
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if (TimerList && getitimer(ITIMER_REAL, &itimer) == 0)
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TimerList->rest = itimer.it_value.tv_sec * SECTICKS +
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itimer.it_value.tv_usec / TICKUNIT;
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#define SECS(val) ((val) / SECTICKS)
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#define HSECS(val) (((val) % SECTICKS) * 100 / SECTICKS)
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#define DISP \
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"%s timer[%p]: freq = %ld.%02lds, next = %lu.%02lus, state = %s\n", \
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pt->name, pt, SECS(pt->load), HSECS(pt->load), SECS(rest), \
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HSECS(rest), tState2Nam(pt->state)
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if (!prompt)
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log_Printf(LogLevel, "---- Begin of Timer Service List---\n");
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for (pt = TimerList; pt; pt = pt->next) {
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rest += pt->rest;
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if (prompt)
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prompt_Printf(prompt, DISP);
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else
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log_Printf(LogLevel, DISP);
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}
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if (!prompt)
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log_Printf(LogLevel, "---- End of Timer Service List ---\n");
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}
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void
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timer_InitService(int restart)
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{
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struct itimerval itimer;
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if (TimerList) {
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if (!restart)
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sig_signal(SIGALRM, (void (*)(int))TimerService);
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itimer.it_interval.tv_sec = 0;
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itimer.it_interval.tv_usec = 0;
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itimer.it_value.tv_sec = TimerList->rest / SECTICKS;
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itimer.it_value.tv_usec = (TimerList->rest % SECTICKS) * TICKUNIT;
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if (setitimer(ITIMER_REAL, &itimer, NULL) == -1)
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log_Printf(LogERROR, "Unable to set itimer (%s)\n", strerror(errno));
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}
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}
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void
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timer_TermService(void)
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{
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struct itimerval itimer;
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itimer.it_interval.tv_usec = itimer.it_interval.tv_sec = 0;
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itimer.it_value.tv_usec = itimer.it_value.tv_sec = 0;
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if (setitimer(ITIMER_REAL, &itimer, NULL) == -1)
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log_Printf(LogERROR, "Unable to set itimer (%s)\n", strerror(errno));
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sig_signal(SIGALRM, SIG_IGN);
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}
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