1de7b4b805
Mainly focus on files that use BSD 2-Clause license, however the tool I was using misidentified many licenses so this was mostly a manual - error prone - task. The Software Package Data Exchange (SPDX) group provides a specification to make it easier for automated tools to detect and summarize well known opensource licenses. We are gradually adopting the specification, noting that the tags are considered only advisory and do not, in any way, superceed or replace the license texts. No functional change intended.
305 lines
8.1 KiB
C
305 lines
8.1 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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* Copyright (c) 1996 - 2001, 2009 Brian Somers <brian@Awfulhak.org>
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* based on work by Toshiharu OHNO <tony-o@iij.ad.jp>
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* Internet Initiative Japan, Inc (IIJ)
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#include <errno.h>
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#include <signal.h>
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#include <stdarg.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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#define RESTVAL(t) \
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((t).it_value.tv_sec * SECTICKS + (t).it_value.tv_usec / TICKUNIT + \
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((((t).it_value.tv_usec % TICKUNIT) >= (TICKUNIT >> 1)) ? 1 : 0))
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static struct pppTimer *TimerList = NULL, *ExpiredList = 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 * const 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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sigset_t mask, omask;
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sigemptyset(&mask);
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sigaddset(&mask, SIGALRM);
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sigprocmask(SIG_BLOCK, &mask, &omask);
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StopTimerNoBlock(tp);
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sigprocmask(SIG_SETMASK, &omask, NULL);
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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 itimerval itimer;
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struct pppTimer *t, *pt;
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u_long ticks = 0;
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sigset_t mask, omask;
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sigemptyset(&mask);
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sigaddset(&mask, SIGALRM);
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sigprocmask(SIG_BLOCK, &mask, &omask);
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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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sigprocmask(SIG_SETMASK, &omask, NULL);
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return;
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}
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/*
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* We just need to insert tp in the correct relative place. We don't
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* need to adjust TimerList->rest (yet).
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*/
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if (TimerList && getitimer(ITIMER_REAL, &itimer) == 0)
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ticks = RESTVAL(itimer) - TimerList->rest;
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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(t != NULL); /* [re]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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sigprocmask(SIG_SETMASK, &omask, NULL);
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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 itimerval itimer;
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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_STOPPED)
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return;
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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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if (!pt && getitimer(ITIMER_REAL, &itimer) == 0)
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t->next->rest += RESTVAL(itimer); /* t (tp) was the first in the list */
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else
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t->next->rest += t->rest;
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if (!pt && t->next->rest > 0) /* t->next is now the first in the list */
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timer_InitService(1);
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}
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} else {
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/* Search for any pending expired timers */
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pt = NULL;
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for (t = ExpiredList; t != tp && t != NULL; t = t->enext)
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pt = t;
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if (t) {
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if (pt)
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pt->enext = t->enext;
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else
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ExpiredList = t->enext;
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} else if (tp->state == TIMER_RUNNING)
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log_Printf(LogERROR, "Oops, %s timer not found!!\n", tp->name);
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}
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tp->next = tp->enext = 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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ExpiredList = 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 = ExpiredList;
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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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long rest;
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/*
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* Adjust the base time so that the deltas reflect what's really
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* happening. Changing TimerList->rest might cause it to become zero
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* (if getitimer() returns a value close to zero), and the
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* timer_InitService() call will call setitimer() with zero it_value,
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* stopping the itimer... so be careful!
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*/
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if (TimerList && getitimer(ITIMER_REAL, &itimer) == 0)
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rest = RESTVAL(itimer) - TimerList->rest;
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else
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rest = 0;
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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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