/*- * Copyright (c) 1996 - 2001 Brian Somers * based on work by Toshiharu OHNO * 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 1.38.2.3 2002/09/01 02:12:32 brian Exp $ * $DragonFly: src/usr.sbin/ppp/timer.c,v 1.3 2008/05/19 10:19:49 corecode Exp $ */ #include #include #include #include #include #include #include #include #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; } /* Adjust our first delta so that it reflects what's really happening */ if (TimerList && getitimer(ITIMER_REAL, &itimer) == 0) TimerList->rest = RESTVAL(itimer); 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 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) { /* t (tp) was the first in the list */ struct itimerval itimer; if (getitimer(ITIMER_REAL, &itimer) == 0) t->rest = RESTVAL(itimer); } t->next->rest += t->rest; if (!pt) /* 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; u_long rest = 0; /* Adjust our first delta so that it reflects what's really happening */ if (TimerList && getitimer(ITIMER_REAL, &itimer) == 0) TimerList->rest = RESTVAL(itimer); #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); }