1 /* 2 * PPP Timer Processing Module 3 * 4 * Written by Toshiharu OHNO ([email protected]) 5 * 6 * Copyright (C) 1993, Internet Initiative Japan, Inc. All rights reserverd. 7 * 8 * Redistribution and use in source and binary forms are permitted 9 * provided that the above copyright notice and this paragraph are 10 * duplicated in all such forms and that any documentation, 11 * advertising materials, and other materials related to such 12 * distribution and use acknowledge that the software was developed 13 * by the Internet Initiative Japan, Inc. The name of the 14 * IIJ may not be used to endorse or promote products derived 15 * from this software without specific prior written permission. 16 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR 17 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED 18 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. 19 * 20 * $FreeBSD$ 21 * 22 * TODO: 23 */ 24 25 #include <errno.h> 26 #include <signal.h> 27 #include <stdio.h> 28 #include <string.h> 29 #include <sys/time.h> 30 #include <termios.h> 31 32 #include "log.h" 33 #include "sig.h" 34 #include "timer.h" 35 #include "descriptor.h" 36 #include "prompt.h" 37 38 static struct pppTimer *TimerList = NULL, *ExpiredList = NULL; 39 40 static void StopTimerNoBlock(struct pppTimer *); 41 42 static const char * 43 tState2Nam(u_int state) 44 { 45 static const char * const StateNames[] = { "stopped", "running", "expired" }; 46 47 if (state >= sizeof StateNames / sizeof StateNames[0]) 48 return "unknown"; 49 return StateNames[state]; 50 } 51 52 void 53 timer_Stop(struct pppTimer *tp) 54 { 55 int omask; 56 57 omask = sigblock(sigmask(SIGALRM)); 58 StopTimerNoBlock(tp); 59 sigsetmask(omask); 60 } 61 62 void 63 timer_Start(struct pppTimer *tp) 64 { 65 struct itimerval itimer; 66 struct pppTimer *t, *pt; 67 u_long ticks = 0; 68 int omask; 69 70 omask = sigblock(sigmask(SIGALRM)); 71 72 if (tp->state != TIMER_STOPPED) 73 StopTimerNoBlock(tp); 74 75 if (tp->load == 0) { 76 log_Printf(LogTIMER, "%s timer[%p] has 0 load!\n", tp->name, tp); 77 sigsetmask(omask); 78 return; 79 } 80 81 /* Adjust our first delta so that it reflects what's really happening */ 82 if (TimerList && getitimer(ITIMER_REAL, &itimer) == 0) 83 TimerList->rest = itimer.it_value.tv_sec * SECTICKS + 84 itimer.it_value.tv_usec / TICKUNIT; 85 86 pt = NULL; 87 for (t = TimerList; t; t = t->next) { 88 if (ticks + t->rest >= tp->load) 89 break; 90 ticks += t->rest; 91 pt = t; 92 } 93 94 tp->state = TIMER_RUNNING; 95 tp->rest = tp->load - ticks; 96 97 if (t) 98 log_Printf(LogTIMER, "timer_Start: Inserting %s timer[%p] before %s " 99 "timer[%p], delta = %ld\n", tp->name, tp, t->name, t, tp->rest); 100 else 101 log_Printf(LogTIMER, "timer_Start: Inserting %s timer[%p]\n", tp->name, tp); 102 103 /* Insert given *tp just before *t */ 104 tp->next = t; 105 if (pt) { 106 pt->next = tp; 107 } else { 108 TimerList = tp; 109 timer_InitService(t != NULL); /* [re]Start the Timer Service */ 110 } 111 if (t) 112 t->rest -= tp->rest; 113 114 sigsetmask(omask); 115 } 116 117 static void 118 StopTimerNoBlock(struct pppTimer *tp) 119 { 120 struct pppTimer *t, *pt; 121 122 /* 123 * A RUNNING timer must be removed from TimerList (->next list). 124 * A STOPPED timer isn't in any list, but may have a bogus [e]next field. 125 * An EXPIRED timer is in the ->enext list. 126 */ 127 128 if (tp->state == TIMER_STOPPED) 129 return; 130 131 pt = NULL; 132 for (t = TimerList; t != tp && t != NULL; t = t->next) 133 pt = t; 134 135 if (t) { 136 if (pt) 137 pt->next = t->next; 138 else { 139 TimerList = t->next; 140 if (TimerList == NULL) /* Last one ? */ 141 timer_TermService(); /* Terminate Timer Service */ 142 } 143 if (t->next) { 144 if (!pt) { /* t (tp) was the first in the list */ 145 struct itimerval itimer; 146 147 if (getitimer(ITIMER_REAL, &itimer) == 0) 148 t->rest = itimer.it_value.tv_sec * SECTICKS + 149 itimer.it_value.tv_usec / TICKUNIT; 150 } 151 t->next->rest += t->rest; 152 if (!pt) /* t->next is now the first in the list */ 153 timer_InitService(1); 154 } 155 } else { 156 /* Search for any pending expired timers */ 157 pt = NULL; 158 for (t = ExpiredList; t != tp && t != NULL; t = t->enext) 159 pt = t; 160 161 if (t) { 162 if (pt) 163 pt->enext = t->enext; 164 else 165 ExpiredList = t->enext; 166 } else if (tp->state == TIMER_RUNNING) 167 log_Printf(LogERROR, "Oops, %s timer not found!!\n", tp->name); 168 } 169 170 tp->next = tp->enext = NULL; 171 tp->state = TIMER_STOPPED; 172 } 173 174 static void 175 TimerService(void) 176 { 177 struct pppTimer *tp, *exp, *next; 178 179 if (log_IsKept(LogTIMER)) { 180 static time_t t; /* Only show timers globally every second */ 181 time_t n = time(NULL); 182 183 if (n > t) 184 timer_Show(LogTIMER, NULL); 185 t = n; 186 } 187 188 tp = TimerList; 189 if (tp) { 190 tp->rest = 0; 191 192 /* Multiple timers might expire at once. Create a list of expired timers */ 193 exp = NULL; 194 do { 195 tp->state = TIMER_EXPIRED; 196 next = tp->next; 197 tp->enext = exp; 198 exp = tp; 199 tp = next; 200 } while (tp && tp->rest == 0); 201 202 TimerList = tp; 203 if (TimerList != NULL) /* Any timers remaining ? */ 204 timer_InitService(1); /* Restart the Timer Service */ 205 else 206 timer_TermService(); /* Stop the Timer Service */ 207 208 /* Process all expired timers */ 209 while (exp) { 210 ExpiredList = exp->enext; 211 exp->enext = NULL; 212 if (exp->func) 213 (*exp->func)(exp->arg); 214 exp = ExpiredList; 215 } 216 } 217 } 218 219 void 220 timer_Show(int LogLevel, struct prompt *prompt) 221 { 222 struct itimerval itimer; 223 struct pppTimer *pt; 224 u_long rest = 0; 225 226 /* Adjust our first delta so that it reflects what's really happening */ 227 if (TimerList && getitimer(ITIMER_REAL, &itimer) == 0) 228 TimerList->rest = itimer.it_value.tv_sec * SECTICKS + 229 itimer.it_value.tv_usec / TICKUNIT; 230 231 #define SECS(val) ((val) / SECTICKS) 232 #define HSECS(val) (((val) % SECTICKS) * 100 / SECTICKS) 233 #define DISP \ 234 "%s timer[%p]: freq = %ld.%02lds, next = %lu.%02lus, state = %s\n", \ 235 pt->name, pt, SECS(pt->load), HSECS(pt->load), SECS(rest), \ 236 HSECS(rest), tState2Nam(pt->state) 237 238 if (!prompt) 239 log_Printf(LogLevel, "---- Begin of Timer Service List---\n"); 240 241 for (pt = TimerList; pt; pt = pt->next) { 242 rest += pt->rest; 243 if (prompt) 244 prompt_Printf(prompt, DISP); 245 else 246 log_Printf(LogLevel, DISP); 247 } 248 249 if (!prompt) 250 log_Printf(LogLevel, "---- End of Timer Service List ---\n"); 251 } 252 253 void 254 timer_InitService(int restart) 255 { 256 struct itimerval itimer; 257 258 if (TimerList) { 259 if (!restart) 260 sig_signal(SIGALRM, (void (*)(int))TimerService); 261 itimer.it_interval.tv_sec = 0; 262 itimer.it_interval.tv_usec = 0; 263 itimer.it_value.tv_sec = TimerList->rest / SECTICKS; 264 itimer.it_value.tv_usec = (TimerList->rest % SECTICKS) * TICKUNIT; 265 if (setitimer(ITIMER_REAL, &itimer, NULL) == -1) 266 log_Printf(LogERROR, "Unable to set itimer (%s)\n", strerror(errno)); 267 } 268 } 269 270 void 271 timer_TermService(void) 272 { 273 struct itimerval itimer; 274 275 itimer.it_interval.tv_usec = itimer.it_interval.tv_sec = 0; 276 itimer.it_value.tv_usec = itimer.it_value.tv_sec = 0; 277 if (setitimer(ITIMER_REAL, &itimer, NULL) == -1) 278 log_Printf(LogERROR, "Unable to set itimer (%s)\n", strerror(errno)); 279 sig_signal(SIGALRM, SIG_IGN); 280 } 281