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 * $FreeBSD$ 29 */ 30 31 #include <errno.h> 32 #include <signal.h> 33 #include <stdio.h> 34 #include <string.h> 35 #include <sys/time.h> 36 #include <termios.h> 37 38 #include "log.h" 39 #include "sig.h" 40 #include "timer.h" 41 #include "descriptor.h" 42 #include "prompt.h" 43 44 45 #define RESTVAL(t) \ 46 ((t).it_value.tv_sec * SECTICKS + (t).it_value.tv_usec / TICKUNIT + \ 47 ((((t).it_value.tv_usec % TICKUNIT) >= (TICKUNIT >> 1)) ? 1 : 0)) 48 49 static struct pppTimer *TimerList = NULL, *ExpiredList = NULL; 50 51 static void StopTimerNoBlock(struct pppTimer *); 52 53 static const char * 54 tState2Nam(u_int state) 55 { 56 static const char * const StateNames[] = { "stopped", "running", "expired" }; 57 58 if (state >= sizeof StateNames / sizeof StateNames[0]) 59 return "unknown"; 60 return StateNames[state]; 61 } 62 63 void 64 timer_Stop(struct pppTimer *tp) 65 { 66 int omask; 67 68 omask = sigblock(sigmask(SIGALRM)); 69 StopTimerNoBlock(tp); 70 sigsetmask(omask); 71 } 72 73 void 74 timer_Start(struct pppTimer *tp) 75 { 76 struct itimerval itimer; 77 struct pppTimer *t, *pt; 78 u_long ticks = 0; 79 int omask; 80 81 omask = sigblock(sigmask(SIGALRM)); 82 83 if (tp->state != TIMER_STOPPED) 84 StopTimerNoBlock(tp); 85 86 if (tp->load == 0) { 87 log_Printf(LogTIMER, "%s timer[%p] has 0 load!\n", tp->name, tp); 88 sigsetmask(omask); 89 return; 90 } 91 92 /* Adjust our first delta so that it reflects what's really happening */ 93 if (TimerList && getitimer(ITIMER_REAL, &itimer) == 0) 94 TimerList->rest = RESTVAL(itimer); 95 96 pt = NULL; 97 for (t = TimerList; t; t = t->next) { 98 if (ticks + t->rest >= tp->load) 99 break; 100 ticks += t->rest; 101 pt = t; 102 } 103 104 tp->state = TIMER_RUNNING; 105 tp->rest = tp->load - ticks; 106 107 if (t) 108 log_Printf(LogTIMER, "timer_Start: Inserting %s timer[%p] before %s " 109 "timer[%p], delta = %ld\n", tp->name, tp, t->name, t, tp->rest); 110 else 111 log_Printf(LogTIMER, "timer_Start: Inserting %s timer[%p]\n", tp->name, tp); 112 113 /* Insert given *tp just before *t */ 114 tp->next = t; 115 if (pt) { 116 pt->next = tp; 117 } else { 118 TimerList = tp; 119 timer_InitService(t != NULL); /* [re]Start the Timer Service */ 120 } 121 if (t) 122 t->rest -= tp->rest; 123 124 sigsetmask(omask); 125 } 126 127 static void 128 StopTimerNoBlock(struct pppTimer *tp) 129 { 130 struct pppTimer *t, *pt; 131 132 /* 133 * A RUNNING timer must be removed from TimerList (->next list). 134 * A STOPPED timer isn't in any list, but may have a bogus [e]next field. 135 * An EXPIRED timer is in the ->enext list. 136 */ 137 138 if (tp->state == TIMER_STOPPED) 139 return; 140 141 pt = NULL; 142 for (t = TimerList; t != tp && t != NULL; t = t->next) 143 pt = t; 144 145 if (t) { 146 if (pt) 147 pt->next = t->next; 148 else { 149 TimerList = t->next; 150 if (TimerList == NULL) /* Last one ? */ 151 timer_TermService(); /* Terminate Timer Service */ 152 } 153 if (t->next) { 154 if (!pt) { /* t (tp) was the first in the list */ 155 struct itimerval itimer; 156 157 if (getitimer(ITIMER_REAL, &itimer) == 0) 158 t->rest = RESTVAL(itimer); 159 } 160 t->next->rest += t->rest; 161 if (!pt) /* t->next is now the first in the list */ 162 timer_InitService(1); 163 } 164 } else { 165 /* Search for any pending expired timers */ 166 pt = NULL; 167 for (t = ExpiredList; t != tp && t != NULL; t = t->enext) 168 pt = t; 169 170 if (t) { 171 if (pt) 172 pt->enext = t->enext; 173 else 174 ExpiredList = t->enext; 175 } else if (tp->state == TIMER_RUNNING) 176 log_Printf(LogERROR, "Oops, %s timer not found!!\n", tp->name); 177 } 178 179 tp->next = tp->enext = NULL; 180 tp->state = TIMER_STOPPED; 181 } 182 183 static void 184 TimerService(void) 185 { 186 struct pppTimer *tp, *exp, *next; 187 188 if (log_IsKept(LogTIMER)) { 189 static time_t t; /* Only show timers globally every second */ 190 time_t n = time(NULL); 191 192 if (n > t) 193 timer_Show(LogTIMER, NULL); 194 t = n; 195 } 196 197 tp = TimerList; 198 if (tp) { 199 tp->rest = 0; 200 201 /* Multiple timers might expire at once. Create a list of expired timers */ 202 exp = NULL; 203 do { 204 tp->state = TIMER_EXPIRED; 205 next = tp->next; 206 tp->enext = exp; 207 exp = tp; 208 tp = next; 209 } while (tp && tp->rest == 0); 210 211 TimerList = tp; 212 if (TimerList != NULL) /* Any timers remaining ? */ 213 timer_InitService(1); /* Restart the Timer Service */ 214 else 215 timer_TermService(); /* Stop the Timer Service */ 216 217 /* Process all expired timers */ 218 while (exp) { 219 ExpiredList = exp->enext; 220 exp->enext = NULL; 221 if (exp->func) 222 (*exp->func)(exp->arg); 223 exp = ExpiredList; 224 } 225 } 226 } 227 228 void 229 timer_Show(int LogLevel, struct prompt *prompt) 230 { 231 struct itimerval itimer; 232 struct pppTimer *pt; 233 u_long rest = 0; 234 235 /* Adjust our first delta so that it reflects what's really happening */ 236 if (TimerList && getitimer(ITIMER_REAL, &itimer) == 0) 237 TimerList->rest = RESTVAL(itimer); 238 239 #define SECS(val) ((val) / SECTICKS) 240 #define HSECS(val) (((val) % SECTICKS) * 100 / SECTICKS) 241 #define DISP \ 242 "%s timer[%p]: freq = %ld.%02lds, next = %lu.%02lus, state = %s\n", \ 243 pt->name, pt, SECS(pt->load), HSECS(pt->load), SECS(rest), \ 244 HSECS(rest), tState2Nam(pt->state) 245 246 if (!prompt) 247 log_Printf(LogLevel, "---- Begin of Timer Service List---\n"); 248 249 for (pt = TimerList; pt; pt = pt->next) { 250 rest += pt->rest; 251 if (prompt) 252 prompt_Printf(prompt, DISP); 253 else 254 log_Printf(LogLevel, DISP); 255 } 256 257 if (!prompt) 258 log_Printf(LogLevel, "---- End of Timer Service List ---\n"); 259 } 260 261 void 262 timer_InitService(int restart) 263 { 264 struct itimerval itimer; 265 266 if (TimerList) { 267 if (!restart) 268 sig_signal(SIGALRM, (void (*)(int))TimerService); 269 itimer.it_interval.tv_sec = 0; 270 itimer.it_interval.tv_usec = 0; 271 itimer.it_value.tv_sec = TimerList->rest / SECTICKS; 272 itimer.it_value.tv_usec = (TimerList->rest % SECTICKS) * TICKUNIT; 273 if (setitimer(ITIMER_REAL, &itimer, NULL) == -1) 274 log_Printf(LogERROR, "Unable to set itimer (%s)\n", strerror(errno)); 275 } 276 } 277 278 void 279 timer_TermService(void) 280 { 281 struct itimerval itimer; 282 283 itimer.it_interval.tv_usec = itimer.it_interval.tv_sec = 0; 284 itimer.it_value.tv_usec = itimer.it_value.tv_sec = 0; 285 if (setitimer(ITIMER_REAL, &itimer, NULL) == -1) 286 log_Printf(LogERROR, "Unable to set itimer (%s)\n", strerror(errno)); 287 sig_signal(SIGALRM, SIG_IGN); 288 } 289