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-rw-r--r--src/timer.c302
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diff --git a/src/timer.c b/src/timer.c
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+++ b/src/timer.c
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+/*-
+ * Copyright (c) 1996 - 2001, 2009 Brian Somers <brian@Awfulhak.org>
+ * based on work by Toshiharu OHNO <tony-o@iij.ad.jp>
+ * Internet Initiative Japan, Inc (IIJ)
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * $FreeBSD: src/usr.sbin/ppp/timer.c,v 1.47.24.1.4.1 2010/12/21 17:10:29 kensmith Exp $
+ */
+
+#include <errno.h>
+#include <signal.h>
+#include <stdarg.h>
+#include <stdio.h>
+#include <string.h>
+#include <sys/time.h>
+#include <termios.h>
+
+#include "log.h"
+#include "sig.h"
+#include "timer.h"
+#include "descriptor.h"
+#include "prompt.h"
+
+
+#define RESTVAL(t) \
+ ((t).it_value.tv_sec * SECTICKS + (t).it_value.tv_usec / TICKUNIT + \
+ ((((t).it_value.tv_usec % TICKUNIT) >= (TICKUNIT >> 1)) ? 1 : 0))
+
+static struct pppTimer *TimerList = NULL, *ExpiredList = NULL;
+
+static void StopTimerNoBlock(struct pppTimer *);
+
+static const char *
+tState2Nam(u_int state)
+{
+ static const char * const StateNames[] = { "stopped", "running", "expired" };
+
+ if (state >= sizeof StateNames / sizeof StateNames[0])
+ return "unknown";
+ return StateNames[state];
+}
+
+void
+timer_Stop(struct pppTimer *tp)
+{
+ sigset_t mask, omask;
+
+ sigemptyset(&mask);
+ sigaddset(&mask, SIGALRM);
+ sigprocmask(SIG_BLOCK, &mask, &omask);
+ StopTimerNoBlock(tp);
+ sigprocmask(SIG_SETMASK, &omask, NULL);
+}
+
+void
+timer_Start(struct pppTimer *tp)
+{
+ struct itimerval itimer;
+ struct pppTimer *t, *pt;
+ u_long ticks = 0;
+ sigset_t mask, omask;
+
+ sigemptyset(&mask);
+ sigaddset(&mask, SIGALRM);
+ sigprocmask(SIG_BLOCK, &mask, &omask);
+
+ if (tp->state != TIMER_STOPPED)
+ StopTimerNoBlock(tp);
+
+ if (tp->load == 0) {
+ log_Printf(LogTIMER, "%s timer[%p] has 0 load!\n", tp->name, tp);
+ sigprocmask(SIG_SETMASK, &omask, NULL);
+ return;
+ }
+
+ /*
+ * We just need to insert tp in the correct relative place. We don't
+ * need to adjust TimerList->rest (yet).
+ */
+ if (TimerList && getitimer(ITIMER_REAL, &itimer) == 0)
+ ticks = RESTVAL(itimer) - TimerList->rest;
+
+ pt = NULL;
+ for (t = TimerList; t; t = t->next) {
+ if (ticks + t->rest >= tp->load)
+ break;
+ ticks += t->rest;
+ pt = t;
+ }
+
+ tp->state = TIMER_RUNNING;
+ tp->rest = tp->load - ticks;
+
+ if (t)
+ log_Printf(LogTIMER, "timer_Start: Inserting %s timer[%p] before %s "
+ "timer[%p], delta = %ld\n", tp->name, tp, t->name, t, tp->rest);
+ else
+ log_Printf(LogTIMER, "timer_Start: Inserting %s timer[%p]\n", tp->name, tp);
+
+ /* Insert given *tp just before *t */
+ tp->next = t;
+ if (pt) {
+ pt->next = tp;
+ } else {
+ TimerList = tp;
+ timer_InitService(t != NULL); /* [re]Start the Timer Service */
+ }
+ if (t)
+ t->rest -= tp->rest;
+
+ sigprocmask(SIG_SETMASK, &omask, NULL);
+}
+
+static void
+StopTimerNoBlock(struct pppTimer *tp)
+{
+ struct itimerval itimer;
+ struct pppTimer *t, *pt;
+
+ /*
+ * A RUNNING timer must be removed from TimerList (->next list).
+ * A STOPPED timer isn't in any list, but may have a bogus [e]next field.
+ * An EXPIRED timer is in the ->enext list.
+ */
+
+ if (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 ? */
+ timer_TermService(); /* Terminate Timer Service */
+ }
+ if (t->next) {
+ if (!pt && getitimer(ITIMER_REAL, &itimer) == 0)
+ t->next->rest += RESTVAL(itimer); /* t (tp) was the first in the list */
+ else
+ t->next->rest += t->rest;
+ if (!pt && t->next->rest > 0) /* t->next is now the first in the list */
+ timer_InitService(1);
+ }
+ } else {
+ /* Search for any pending expired timers */
+ pt = NULL;
+ for (t = ExpiredList; t != tp && t != NULL; t = t->enext)
+ pt = t;
+
+ if (t) {
+ if (pt)
+ pt->enext = t->enext;
+ else
+ ExpiredList = t->enext;
+ } else if (tp->state == TIMER_RUNNING)
+ log_Printf(LogERROR, "Oops, %s timer not found!!\n", tp->name);
+ }
+
+ tp->next = tp->enext = NULL;
+ tp->state = TIMER_STOPPED;
+}
+
+static void
+TimerService(void)
+{
+ struct pppTimer *tp, *exp, *next;
+
+ if (log_IsKept(LogTIMER)) {
+ static time_t t; /* Only show timers globally every second */
+ time_t n = time(NULL);
+
+ if (n > t)
+ timer_Show(LogTIMER, NULL);
+ t = n;
+ }
+
+ tp = TimerList;
+ if (tp) {
+ tp->rest = 0;
+
+ /* Multiple timers might expire at once. Create a list of expired timers */
+ exp = NULL;
+ do {
+ tp->state = TIMER_EXPIRED;
+ next = tp->next;
+ tp->enext = exp;
+ exp = tp;
+ tp = next;
+ } while (tp && tp->rest == 0);
+
+ TimerList = tp;
+ if (TimerList != NULL) /* Any timers remaining ? */
+ timer_InitService(1); /* Restart the Timer Service */
+ else
+ timer_TermService(); /* Stop the Timer Service */
+
+ /* Process all expired timers */
+ while (exp) {
+ ExpiredList = exp->enext;
+ exp->enext = NULL;
+ if (exp->func)
+ (*exp->func)(exp->arg);
+ exp = ExpiredList;
+ }
+ }
+}
+
+void
+timer_Show(int LogLevel, struct prompt *prompt)
+{
+ struct itimerval itimer;
+ struct pppTimer *pt;
+ long rest;
+
+ /*
+ * Adjust the base time so that the deltas reflect what's really
+ * happening. Changing TimerList->rest might cause it to become zero
+ * (if getitimer() returns a value close to zero), and the
+ * timer_InitService() call will call setitimer() with zero it_value,
+ * stopping the itimer... so be careful!
+ */
+ if (TimerList && getitimer(ITIMER_REAL, &itimer) == 0)
+ rest = RESTVAL(itimer) - TimerList->rest;
+ else
+ rest = 0;
+
+#define SECS(val) ((val) / SECTICKS)
+#define HSECS(val) (((val) % SECTICKS) * 100 / SECTICKS)
+#define DISP \
+ "%s timer[%p]: freq = %ld.%02lds, next = %lu.%02lus, state = %s\n", \
+ pt->name, pt, SECS(pt->load), HSECS(pt->load), SECS(rest), \
+ HSECS(rest), tState2Nam(pt->state)
+
+ if (!prompt)
+ log_Printf(LogLevel, "---- Begin of Timer Service List---\n");
+
+ for (pt = TimerList; pt; pt = pt->next) {
+ rest += pt->rest;
+ if (prompt)
+ prompt_Printf(prompt, DISP);
+ else
+ log_Printf(LogLevel, DISP);
+ }
+
+ if (!prompt)
+ log_Printf(LogLevel, "---- End of Timer Service List ---\n");
+}
+
+void
+timer_InitService(int restart)
+{
+ struct itimerval itimer;
+
+ if (TimerList) {
+ if (!restart)
+ sig_signal(SIGALRM, (void (*)(int))TimerService);
+ itimer.it_interval.tv_sec = 0;
+ itimer.it_interval.tv_usec = 0;
+ itimer.it_value.tv_sec = TimerList->rest / SECTICKS;
+ itimer.it_value.tv_usec = (TimerList->rest % SECTICKS) * TICKUNIT;
+ if (setitimer(ITIMER_REAL, &itimer, NULL) == -1)
+ log_Printf(LogERROR, "Unable to set itimer (%s)\n", strerror(errno));
+ }
+}
+
+void
+timer_TermService(void)
+{
+ struct itimerval itimer;
+
+ itimer.it_interval.tv_usec = itimer.it_interval.tv_sec = 0;
+ itimer.it_value.tv_usec = itimer.it_value.tv_sec = 0;
+ if (setitimer(ITIMER_REAL, &itimer, NULL) == -1)
+ log_Printf(LogERROR, "Unable to set itimer (%s)\n", strerror(errno));
+ sig_signal(SIGALRM, SIG_IGN);
+}
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