293 lines
6.5 KiB
C
293 lines
6.5 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 1.15 1997/05/09 20:48:21 brian Exp $
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*
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* TODO:
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*/
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#include "defs.h"
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#include <sys/time.h>
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#include <signal.h>
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#include "timeout.h"
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#ifdef SIGALRM
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#include <errno.h>
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#endif
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#include "sig.h"
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void StopTimerNoBlock( struct pppTimer *);
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void ShowTimers(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(tp)
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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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#ifdef DEBUG
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logprintf("timer %x has 0 load!\n", tp);
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#endif
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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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#ifdef DEBUG
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logprintf("StartTimer: %x(%d): ticks: %d, rest: %d\n", t, t->state, ticks, t->rest);
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#endif
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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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#ifdef DEBUG
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logprintf("Inserting %x before %x, rest = %d\n", tp, t, tp->rest);
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#endif
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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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void
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StopTimerNoBlock(tp)
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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,
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* But STOPPED/EXPIRED is already removing TimerList.
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* So just marked as TIMER_STOPPED.
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* Do not change tp->enext!! (Might be Called by expired proc)
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*/
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#ifdef DEBUG
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logprintf("StopTimer: %x, next = %x state=%x\n", tp, tp->next, tp->state);
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#endif
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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("Oops, timer not found!!\n");
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}
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tp->next = NULL;
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tp->state = TIMER_STOPPED;
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}
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void
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TimerService()
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{
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struct pppTimer *tp, *exp, *wt;
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#ifdef DEBUG
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ShowTimers();
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#endif
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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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#ifdef DEBUG
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logprintf("Add %x to exp\n", tp);
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#endif
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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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#ifdef DEBUG
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logprintf("TimerService: next is %x(%d)\n",
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TimerList, TimerList? TimerList->rest : 0);
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#endif
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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
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* And exp->enext will be intialized at next expire
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* 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("---- Begin of Timer Service List---\n");
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for (pt = TimerList; pt; pt = pt->next)
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logprintf("%x: load = %d, rest = %d, state =%x\n",
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pt, pt->load, pt->rest, pt->state);
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logprintf("---- End of Timer Service List ---\n");
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}
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#ifdef SIGALRM
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u_int
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sleep( u_int sec )
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{
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struct timeval to,st,et;
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long sld, nwd, std;
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gettimeofday( &st, NULL );
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to.tv_sec = sec;
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to.tv_usec = 0;
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std = st.tv_sec * 1000000 + st.tv_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( &et, NULL );
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sld = to.tv_sec * 1000000 + to.tv_sec;
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nwd = et.tv_sec * 1000000 + et.tv_usec - std;
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if ( sld > nwd )
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sld -= nwd;
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else
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sld = 1; /* Avoid both tv_sec/usec is 0 */
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/* Calculate timeout value for select */
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to.tv_sec = sld / 1000000;
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to.tv_usec = sld % 1000000;
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}
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}
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return (0L);
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}
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void usleep( u_int usec)
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{
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struct timeval to,st,et;
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long sld, nwd, std;
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gettimeofday( &st, NULL );
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to.tv_sec = 0;
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to.tv_usec = usec;
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std = st.tv_sec * 1000000 + st.tv_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( &et, NULL );
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sld = to.tv_sec * 1000000 + to.tv_sec;
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nwd = et.tv_sec * 1000000 + et.tv_usec - std;
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if ( sld > nwd )
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sld -= nwd;
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else
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sld = 1; /* Avoid both tv_sec/usec is 0 */
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/* Calculate timeout value for select */
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to.tv_sec = sld / 1000000;
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to.tv_usec = sld % 1000000;
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}
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}
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}
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void InitTimerService( void ) {
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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("Unable to set itimer.\n");
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}
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}
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void TermTimerService( void ) {
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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("Unable to set itimer.\n");
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}
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pending_signal(SIGALRM, SIG_IGN);
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}
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#endif
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