freebsd-dev/usr.sbin/ppp/timer.c
1996-01-10 21:28:04 +00:00

291 lines
6.5 KiB
C

/*
* PPP Timer Processing Module
*
* Written by Toshiharu OHNO (tony-o@iij.ad.jp)
*
* Copyright (C) 1993, Internet Initiative Japan, Inc. All rights reserverd.
*
* Redistribution and use in source and binary forms are permitted
* provided that the above copyright notice and this paragraph are
* duplicated in all such forms and that any documentation,
* advertising materials, and other materials related to such
* distribution and use acknowledge that the software was developed
* by the Internet Initiative Japan, Inc. The name of the
* IIJ may not be used to endorse or promote products derived
* from this software without specific prior written permission.
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
* WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*
* $Id: timer.c,v 1.4 1995/05/30 03:50:59 rgrimes Exp $
*
* TODO:
*/
#include "defs.h"
#include <sys/time.h>
#include <signal.h>
#include "timeout.h"
#ifdef SIGALRM
#include <errno.h>
#endif
void StopTimerNoBlock( struct pppTimer *);
void ShowTimers(void);
void
StopTimer( struct pppTimer *tp )
{
#ifdef SIGALRM
int omask;
omask = sigblock(sigmask(SIGALRM));
#endif
StopTimerNoBlock(tp);
#ifdef SIGALRM
sigsetmask(omask);
#endif
}
void
StartTimer(tp)
struct pppTimer *tp;
{
struct pppTimer *t, *pt;
u_long ticks = 0;
#ifdef SIGALRM
int omask;
omask = sigblock(sigmask(SIGALRM));
#endif
if (tp->state != TIMER_STOPPED) {
StopTimerNoBlock(tp);
}
if (tp->load == 0) {
#ifdef DEBUG
logprintf("timer %x has 0 load!\n", tp);
#endif
sigsetmask(omask);
return;
}
pt = NULL;
for (t = TimerList; t; t = t->next) {
#ifdef DEBUG
logprintf("StartTimer: %x(%d): ticks: %d, rest: %d\n", t, t->state, ticks, t->rest);
#endif
if (ticks + t->rest >= tp->load)
break;
ticks += t->rest;
pt = t;
}
tp->state = TIMER_RUNNING;
tp->rest = tp->load - ticks;
#ifdef DEBUG
logprintf("Inserting %x before %x, rest = %d\n", tp, t, tp->rest);
#endif
/* Insert given *tp just before *t */
tp->next = t;
if (pt) {
pt->next = tp;
} else {
InitTimerService();
TimerList = tp;
}
if (t)
t->rest -= tp->rest;
#ifdef SIGALRM
sigsetmask(omask);
#endif
}
void
StopTimerNoBlock(tp)
struct pppTimer *tp;
{
struct pppTimer *t, *pt;
/*
* A Running Timer should be removing TimerList,
* But STOPPED/EXPIRED is already removing TimerList.
* So just marked as TIMER_STOPPED.
* Do not change tp->enext!! (Might be Called by expired proc)
*/
#ifdef DEBUG
logprintf("StopTimer: %x, next = %x state=%x\n", tp, tp->next, tp->state);
#endif
if (tp->state != TIMER_RUNNING) {
tp->next = NULL;
tp->state = TIMER_STOPPED;
return;
}
pt = NULL;
for (t = TimerList; t != tp && t !=NULL ; t = t->next)
pt = t;
if (t) {
if (pt) {
pt->next = t->next;
} else {
TimerList = t->next;
if ( TimerList == NULL ) /* Last one ? */
TermTimerService(); /* Terminate Timer Service */
}
if (t->next)
t->next->rest += tp->rest;
} else {
logprintf("Oops, timer not found!!\n");
}
tp->next = NULL;
tp->state = TIMER_STOPPED;
}
void
TimerService()
{
struct pppTimer *tp, *exp, *wt;
#ifdef DEBUG
ShowTimers();
#endif
tp = TimerList;
if (tp) {
tp->rest--;
if (tp->rest == 0) {
/*
* Multiple timers may expires at once. Create list of expired timers.
*/
exp = NULL;
do {
tp->state = TIMER_EXPIRED;
wt = tp->next;
tp->enext = exp;
exp = tp;
#ifdef DEBUG
logprintf("Add %x to exp\n", tp);
#endif
tp = wt;
} while (tp && (tp->rest == 0));
TimerList = tp;
if ( TimerList == NULL ) /* No timers ? */
TermTimerService(); /* Terminate Timer Service */
#ifdef DEBUG
logprintf("TimerService: next is %x(%d)\n",
TimerList, TimerList? TimerList->rest : 0);
#endif
/*
* Process all expired timers.
*/
while (exp) {
#ifdef notdef
StopTimer(exp);
#endif
if (exp->func)
(*exp->func)(exp->arg);
/*
* Just Removing each item from expired list
* And exp->enext will be intialized at next expire
* in this funtion.
*/
exp = exp->enext;
}
}
}
}
void
ShowTimers()
{
struct pppTimer *pt;
logprintf("---- Begin of Timer Service List---\n");
for (pt = TimerList; pt; pt = pt->next)
logprintf("%x: load = %d, rest = %d, state =%x\n",
pt, pt->load, pt->rest, pt->state);
logprintf("---- End of Timer Service List ---\n");
}
#ifdef SIGALRM
u_int
sleep( u_int sec )
{
struct timeval to,st,et;
long sld, nwd, std;
gettimeofday( &st, NULL );
to.tv_sec = sec;
to.tv_usec = 0;
std = st.tv_sec * 1000000 + st.tv_usec;
for (;;) {
if ( select ( 0, NULL, NULL, NULL, &to) == 0 ||
errno != EINTR ) {
break;
} else {
gettimeofday( &et, NULL );
sld = to.tv_sec * 1000000 + to.tv_sec;
nwd = et.tv_sec * 1000000 + et.tv_usec - std;
if ( sld > nwd )
sld -= nwd;
else
sld = 1; /* Avoid both tv_sec/usec is 0 */
/* Calculate timeout value for select */
to.tv_sec = sld / 1000000;
to.tv_usec = sld % 1000000;
}
}
return (0L);
}
void usleep( u_int usec)
{
struct timeval to,st,et;
long sld, nwd, std;
gettimeofday( &st, NULL );
to.tv_sec = 0;
to.tv_usec = usec;
std = st.tv_sec * 1000000 + st.tv_usec;
for (;;) {
if ( select ( 0, NULL, NULL, NULL, &to) == 0 ||
errno != EINTR ) {
break;
} else {
gettimeofday( &et, NULL );
sld = to.tv_sec * 1000000 + to.tv_sec;
nwd = et.tv_sec * 1000000 + et.tv_usec - std;
if ( sld > nwd )
sld -= nwd;
else
sld = 1; /* Avoid both tv_sec/usec is 0 */
/* Calculate timeout value for select */
to.tv_sec = sld / 1000000;
to.tv_usec = sld % 1000000;
}
}
}
void InitTimerService( void ) {
struct itimerval itimer;
signal(SIGALRM, (void (*)(int))TimerService);
itimer.it_interval.tv_sec = itimer.it_value.tv_sec = 0;
itimer.it_interval.tv_usec = itimer.it_value.tv_usec = TICKUNIT;
setitimer(ITIMER_REAL, &itimer, NULL);
}
void TermTimerService( void ) {
struct itimerval itimer;
itimer.it_interval.tv_sec = itimer.it_value.tv_sec = 0;
itimer.it_value.tv_usec = itimer.it_value.tv_sec = 0;
setitimer(ITIMER_REAL, &itimer, NULL);
/*
* Notes: after disabling timer here, we will get one
* SIGALRM will be got.
*/
signal(SIGALRM, SIG_IGN);
}
#endif