290 lines
6.7 KiB
C
290 lines
6.7 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 1.26 1997/12/29 22:23:52 brian Exp $
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*
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* TODO:
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*/
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#include <signal.h>
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#ifdef SIGALRM
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#include <errno.h>
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#endif
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#include <sys/time.h>
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#include <unistd.h>
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#include "command.h"
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#include "mbuf.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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static struct pppTimer *TimerList = NULL;
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static void StopTimerNoBlock(struct pppTimer *);
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static void InitTimerService(void);
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void
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StopTimer(struct pppTimer * tp)
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{
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#ifdef SIGALRM
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int omask;
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omask = sigblock(sigmask(SIGALRM));
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#endif
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StopTimerNoBlock(tp);
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#ifdef SIGALRM
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sigsetmask(omask);
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#endif
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}
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void
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StartTimer(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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#ifdef SIGALRM
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int omask;
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omask = sigblock(sigmask(SIGALRM));
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#endif
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if (tp->state != TIMER_STOPPED) {
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StopTimerNoBlock(tp);
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}
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if (tp->load == 0) {
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LogPrintf(LogDEBUG, "timer %x has 0 load!\n", 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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LogPrintf(LogDEBUG, "StartTimer: %x(%d): ticks: %d, rest: %d\n",
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t, t->state, ticks, t->rest);
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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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LogPrintf(LogDEBUG, "StartTimer: Inserting %x before %x, rest = %d\n",
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tp, t, tp->rest);
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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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InitTimerService();
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TimerList = tp;
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}
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if (t)
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t->rest -= tp->rest;
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#ifdef SIGALRM
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sigsetmask(omask);
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#endif
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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 should be removing TimerList, But STOPPED/EXPIRED is
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* already removing TimerList. So just marked as TIMER_STOPPED. Do not
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* change tp->enext!! (Might be Called by expired proc)
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*/
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LogPrintf(LogDEBUG, "StopTimer: %x, next = %x state=%x\n",
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tp, tp->next, tp->state);
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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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TermTimerService(); /* 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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LogPrintf(LogERROR, "Oops, timer not found!!\n");
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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()
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{
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struct pppTimer *tp, *exp, *wt;
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if (LogIsKept(LogDEBUG))
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ShowTimers();
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tp = TimerList;
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if (tp) {
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tp->rest--;
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if (tp->rest == 0) {
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/*
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* Multiple timers may expires at once. Create list of expired timers.
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*/
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exp = NULL;
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do {
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tp->state = TIMER_EXPIRED;
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wt = tp->next;
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tp->enext = exp;
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exp = tp;
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LogPrintf(LogDEBUG, "TimerService: Add %x to exp\n", tp);
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tp = wt;
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} while (tp && (tp->rest == 0));
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TimerList = tp;
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if (TimerList == NULL) /* No timers ? */
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TermTimerService(); /* Terminate Timer Service */
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LogPrintf(LogDEBUG, "TimerService: next is %x(%d)\n",
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TimerList, TimerList ? TimerList->rest : 0);
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/*
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* Process all expired timers.
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*/
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while (exp) {
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#ifdef notdef
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StopTimer(exp);
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#endif
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if (exp->func)
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(*exp->func) (exp->arg);
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/*
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* Just Removing each item from expired list And exp->enext will be
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* intialized at next expire in this funtion.
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*/
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exp = exp->enext;
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}
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}
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}
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}
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void
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ShowTimers()
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{
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struct pppTimer *pt;
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LogPrintf(LogDEBUG, "---- Begin of Timer Service List---\n");
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for (pt = TimerList; pt; pt = pt->next)
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LogPrintf(LogDEBUG, "%x: load = %d, rest = %d, state =%x\n",
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pt, pt->load, pt->rest, pt->state);
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LogPrintf(LogDEBUG, "---- End of Timer Service List ---\n");
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}
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#ifdef SIGALRM
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static void
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nointr_dosleep(u_int sec, u_int usec)
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{
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struct timeval to, st, et;
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gettimeofday(&st, NULL);
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et.tv_sec = st.tv_sec + sec;
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et.tv_usec = st.tv_usec + usec;
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to.tv_sec = sec;
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to.tv_usec = usec;
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for (;;) {
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if (select(0, NULL, NULL, NULL, &to) == 0 ||
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errno != EINTR) {
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break;
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} else {
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gettimeofday(&to, NULL);
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if (to.tv_sec > et.tv_sec + 1 ||
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(to.tv_sec == et.tv_sec + 1 && to.tv_usec > et.tv_usec) ||
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to.tv_sec < st.tv_sec ||
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(to.tv_sec == st.tv_sec && to.tv_usec < st.tv_usec)) {
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LogPrintf(LogWARN, "Clock adjusted between %d and %d seconds "
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"during sleep !\n",
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to.tv_sec - st.tv_sec, sec + to.tv_sec - st.tv_sec);
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st.tv_sec = to.tv_sec;
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st.tv_usec = to.tv_usec;
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et.tv_sec = st.tv_sec + sec;
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et.tv_usec = st.tv_usec + usec;
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to.tv_sec = sec;
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to.tv_usec = usec;
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} else if (to.tv_sec > et.tv_sec ||
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(to.tv_sec == et.tv_sec && to.tv_usec >= et.tv_usec)) {
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break;
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} else {
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to.tv_sec = et.tv_sec - to.tv_sec;
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if (et.tv_usec < to.tv_usec) {
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to.tv_sec--;
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to.tv_usec = 1000000 + et.tv_usec - to.tv_usec;
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} else
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to.tv_usec = et.tv_usec - to.tv_usec;
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}
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}
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}
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}
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void
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nointr_sleep(u_int sec)
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{
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nointr_dosleep(sec, 0);
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}
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void
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nointr_usleep(u_int usec)
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{
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nointr_dosleep(0, usec);
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}
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static void
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InitTimerService()
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{
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struct itimerval itimer;
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pending_signal(SIGALRM, (void (*) (int)) TimerService);
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itimer.it_interval.tv_sec = itimer.it_value.tv_sec = 0;
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itimer.it_interval.tv_usec = itimer.it_value.tv_usec = TICKUNIT;
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if (setitimer(ITIMER_REAL, &itimer, NULL) == -1)
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LogPrintf(LogERROR, "Unable to set itimer.\n");
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}
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void
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TermTimerService(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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LogPrintf(LogERROR, "Unable to set itimer.\n");
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pending_signal(SIGALRM, SIG_IGN);
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}
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#endif
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