1 /*- 2 * Copyright (c) 1996 - 2001 Brian Somers <brian@Awfulhak.org> 3 * based on work by Toshiharu OHNO <tony-o@iij.ad.jp> 4 * Internet Initiative Japan, Inc (IIJ) 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 * 28 * $FreeBSD: src/usr.sbin/ppp/timer.c,v 1.38.2.3 2002/09/01 02:12:32 brian Exp $ 29 * $DragonFly: src/usr.sbin/ppp/timer.c,v 1.2 2003/06/17 04:30:01 dillon Exp $ 30 */ 31 32 #include <errno.h> 33 #include <signal.h> 34 #include <stdarg.h> 35 #include <stdio.h> 36 #include <string.h> 37 #include <sys/time.h> 38 #include <termios.h> 39 40 #include "log.h" 41 #include "sig.h" 42 #include "timer.h" 43 #include "descriptor.h" 44 #include "prompt.h" 45 46 47 #define RESTVAL(t) \ 48 ((t).it_value.tv_sec * SECTICKS + (t).it_value.tv_usec / TICKUNIT + \ 49 ((((t).it_value.tv_usec % TICKUNIT) >= (TICKUNIT >> 1)) ? 1 : 0)) 50 51 static struct pppTimer *TimerList = NULL, *ExpiredList = NULL; 52 53 static void StopTimerNoBlock(struct pppTimer *); 54 55 static const char * 56 tState2Nam(u_int state) 57 { 58 static const char * const StateNames[] = { "stopped", "running", "expired" }; 59 60 if (state >= sizeof StateNames / sizeof StateNames[0]) 61 return "unknown"; 62 return StateNames[state]; 63 } 64 65 void 66 timer_Stop(struct pppTimer *tp) 67 { 68 sigset_t mask, omask; 69 70 sigemptyset(&mask); 71 sigaddset(&mask, SIGALRM); 72 sigprocmask(SIG_BLOCK, &mask, &omask); 73 StopTimerNoBlock(tp); 74 sigprocmask(SIG_SETMASK, &omask, NULL); 75 } 76 77 void 78 timer_Start(struct pppTimer *tp) 79 { 80 struct itimerval itimer; 81 struct pppTimer *t, *pt; 82 u_long ticks = 0; 83 sigset_t mask, omask; 84 85 sigemptyset(&mask); 86 sigaddset(&mask, SIGALRM); 87 sigprocmask(SIG_BLOCK, &mask, &omask); 88 89 if (tp->state != TIMER_STOPPED) 90 StopTimerNoBlock(tp); 91 92 if (tp->load == 0) { 93 log_Printf(LogTIMER, "%s timer[%p] has 0 load!\n", tp->name, tp); 94 sigprocmask(SIG_SETMASK, &omask, NULL); 95 return; 96 } 97 98 /* Adjust our first delta so that it reflects what's really happening */ 99 if (TimerList && getitimer(ITIMER_REAL, &itimer) == 0) 100 TimerList->rest = RESTVAL(itimer); 101 102 pt = NULL; 103 for (t = TimerList; t; t = t->next) { 104 if (ticks + t->rest >= tp->load) 105 break; 106 ticks += t->rest; 107 pt = t; 108 } 109 110 tp->state = TIMER_RUNNING; 111 tp->rest = tp->load - ticks; 112 113 if (t) 114 log_Printf(LogTIMER, "timer_Start: Inserting %s timer[%p] before %s " 115 "timer[%p], delta = %ld\n", tp->name, tp, t->name, t, tp->rest); 116 else 117 log_Printf(LogTIMER, "timer_Start: Inserting %s timer[%p]\n", tp->name, tp); 118 119 /* Insert given *tp just before *t */ 120 tp->next = t; 121 if (pt) { 122 pt->next = tp; 123 } else { 124 TimerList = tp; 125 timer_InitService(t != NULL); /* [re]Start the Timer Service */ 126 } 127 if (t) 128 t->rest -= tp->rest; 129 130 sigprocmask(SIG_SETMASK, &omask, NULL); 131 } 132 133 static void 134 StopTimerNoBlock(struct pppTimer *tp) 135 { 136 struct pppTimer *t, *pt; 137 138 /* 139 * A RUNNING timer must be removed from TimerList (->next list). 140 * A STOPPED timer isn't in any list, but may have a bogus [e]next field. 141 * An EXPIRED timer is in the ->enext list. 142 */ 143 144 if (tp->state == TIMER_STOPPED) 145 return; 146 147 pt = NULL; 148 for (t = TimerList; t != tp && t != NULL; t = t->next) 149 pt = t; 150 151 if (t) { 152 if (pt) 153 pt->next = t->next; 154 else { 155 TimerList = t->next; 156 if (TimerList == NULL) /* Last one ? */ 157 timer_TermService(); /* Terminate Timer Service */ 158 } 159 if (t->next) { 160 if (!pt) { /* t (tp) was the first in the list */ 161 struct itimerval itimer; 162 163 if (getitimer(ITIMER_REAL, &itimer) == 0) 164 t->rest = RESTVAL(itimer); 165 } 166 t->next->rest += t->rest; 167 if (!pt) /* t->next is now the first in the list */ 168 timer_InitService(1); 169 } 170 } else { 171 /* Search for any pending expired timers */ 172 pt = NULL; 173 for (t = ExpiredList; t != tp && t != NULL; t = t->enext) 174 pt = t; 175 176 if (t) { 177 if (pt) 178 pt->enext = t->enext; 179 else 180 ExpiredList = t->enext; 181 } else if (tp->state == TIMER_RUNNING) 182 log_Printf(LogERROR, "Oops, %s timer not found!!\n", tp->name); 183 } 184 185 tp->next = tp->enext = NULL; 186 tp->state = TIMER_STOPPED; 187 } 188 189 static void 190 TimerService(void) 191 { 192 struct pppTimer *tp, *exp, *next; 193 194 if (log_IsKept(LogTIMER)) { 195 static time_t t; /* Only show timers globally every second */ 196 time_t n = time(NULL); 197 198 if (n > t) 199 timer_Show(LogTIMER, NULL); 200 t = n; 201 } 202 203 tp = TimerList; 204 if (tp) { 205 tp->rest = 0; 206 207 /* Multiple timers might expire at once. Create a list of expired timers */ 208 exp = NULL; 209 do { 210 tp->state = TIMER_EXPIRED; 211 next = tp->next; 212 tp->enext = exp; 213 exp = tp; 214 tp = next; 215 } while (tp && tp->rest == 0); 216 217 TimerList = tp; 218 if (TimerList != NULL) /* Any timers remaining ? */ 219 timer_InitService(1); /* Restart the Timer Service */ 220 else 221 timer_TermService(); /* Stop the Timer Service */ 222 223 /* Process all expired timers */ 224 while (exp) { 225 ExpiredList = exp->enext; 226 exp->enext = NULL; 227 if (exp->func) 228 (*exp->func)(exp->arg); 229 exp = ExpiredList; 230 } 231 } 232 } 233 234 void 235 timer_Show(int LogLevel, struct prompt *prompt) 236 { 237 struct itimerval itimer; 238 struct pppTimer *pt; 239 u_long rest = 0; 240 241 /* Adjust our first delta so that it reflects what's really happening */ 242 if (TimerList && getitimer(ITIMER_REAL, &itimer) == 0) 243 TimerList->rest = RESTVAL(itimer); 244 245 #define SECS(val) ((val) / SECTICKS) 246 #define HSECS(val) (((val) % SECTICKS) * 100 / SECTICKS) 247 #define DISP \ 248 "%s timer[%p]: freq = %ld.%02lds, next = %lu.%02lus, state = %s\n", \ 249 pt->name, pt, SECS(pt->load), HSECS(pt->load), SECS(rest), \ 250 HSECS(rest), tState2Nam(pt->state) 251 252 if (!prompt) 253 log_Printf(LogLevel, "---- Begin of Timer Service List---\n"); 254 255 for (pt = TimerList; pt; pt = pt->next) { 256 rest += pt->rest; 257 if (prompt) 258 prompt_Printf(prompt, DISP); 259 else 260 log_Printf(LogLevel, DISP); 261 } 262 263 if (!prompt) 264 log_Printf(LogLevel, "---- End of Timer Service List ---\n"); 265 } 266 267 void 268 timer_InitService(int restart) 269 { 270 struct itimerval itimer; 271 272 if (TimerList) { 273 if (!restart) 274 sig_signal(SIGALRM, (void (*)(int))TimerService); 275 itimer.it_interval.tv_sec = 0; 276 itimer.it_interval.tv_usec = 0; 277 itimer.it_value.tv_sec = TimerList->rest / SECTICKS; 278 itimer.it_value.tv_usec = (TimerList->rest % SECTICKS) * TICKUNIT; 279 if (setitimer(ITIMER_REAL, &itimer, NULL) == -1) 280 log_Printf(LogERROR, "Unable to set itimer (%s)\n", strerror(errno)); 281 } 282 } 283 284 void 285 timer_TermService(void) 286 { 287 struct itimerval itimer; 288 289 itimer.it_interval.tv_usec = itimer.it_interval.tv_sec = 0; 290 itimer.it_value.tv_usec = itimer.it_value.tv_sec = 0; 291 if (setitimer(ITIMER_REAL, &itimer, NULL) == -1) 292 log_Printf(LogERROR, "Unable to set itimer (%s)\n", strerror(errno)); 293 sig_signal(SIGALRM, SIG_IGN); 294 } 295