1 /* 2 * PPP Timer Processing Module 3 * 4 * Written by Toshiharu OHNO (tony-o@iij.ad.jp) 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 * $Id: timer.c,v 1.26 1997/12/29 22:23:52 brian Exp $ 21 * 22 * TODO: 23 */ 24 25 #include <signal.h> 26 #ifdef SIGALRM 27 #include <errno.h> 28 #endif 29 #include <sys/time.h> 30 #include <unistd.h> 31 32 #include "command.h" 33 #include "mbuf.h" 34 #include "log.h" 35 #include "sig.h" 36 #include "timer.h" 37 38 static struct pppTimer *TimerList = NULL; 39 40 static void StopTimerNoBlock(struct pppTimer *); 41 static void InitTimerService(void); 42 43 void 44 StopTimer(struct pppTimer * tp) 45 { 46 #ifdef SIGALRM 47 int omask; 48 49 omask = sigblock(sigmask(SIGALRM)); 50 #endif 51 StopTimerNoBlock(tp); 52 #ifdef SIGALRM 53 sigsetmask(omask); 54 #endif 55 } 56 57 void 58 StartTimer(struct pppTimer * tp) 59 { 60 struct pppTimer *t, *pt; 61 u_long ticks = 0; 62 63 #ifdef SIGALRM 64 int omask; 65 66 omask = sigblock(sigmask(SIGALRM)); 67 #endif 68 69 if (tp->state != TIMER_STOPPED) { 70 StopTimerNoBlock(tp); 71 } 72 if (tp->load == 0) { 73 LogPrintf(LogDEBUG, "timer %x has 0 load!\n", tp); 74 sigsetmask(omask); 75 return; 76 } 77 pt = NULL; 78 for (t = TimerList; t; t = t->next) { 79 LogPrintf(LogDEBUG, "StartTimer: %x(%d): ticks: %d, rest: %d\n", 80 t, t->state, ticks, t->rest); 81 if (ticks + t->rest >= tp->load) 82 break; 83 ticks += t->rest; 84 pt = t; 85 } 86 87 tp->state = TIMER_RUNNING; 88 tp->rest = tp->load - ticks; 89 LogPrintf(LogDEBUG, "StartTimer: Inserting %x before %x, rest = %d\n", 90 tp, t, tp->rest); 91 /* Insert given *tp just before *t */ 92 tp->next = t; 93 if (pt) { 94 pt->next = tp; 95 } else { 96 InitTimerService(); 97 TimerList = tp; 98 } 99 if (t) 100 t->rest -= tp->rest; 101 102 #ifdef SIGALRM 103 sigsetmask(omask); 104 #endif 105 } 106 107 static void 108 StopTimerNoBlock(struct pppTimer * tp) 109 { 110 struct pppTimer *t, *pt; 111 112 /* 113 * A Running Timer should be removing TimerList, But STOPPED/EXPIRED is 114 * already removing TimerList. So just marked as TIMER_STOPPED. Do not 115 * change tp->enext!! (Might be Called by expired proc) 116 */ 117 LogPrintf(LogDEBUG, "StopTimer: %x, next = %x state=%x\n", 118 tp, tp->next, tp->state); 119 if (tp->state != TIMER_RUNNING) { 120 tp->next = NULL; 121 tp->state = TIMER_STOPPED; 122 return; 123 } 124 pt = NULL; 125 for (t = TimerList; t != tp && t != NULL; t = t->next) 126 pt = t; 127 if (t) { 128 if (pt) { 129 pt->next = t->next; 130 } else { 131 TimerList = t->next; 132 if (TimerList == NULL) /* Last one ? */ 133 TermTimerService(); /* Terminate Timer Service */ 134 } 135 if (t->next) 136 t->next->rest += tp->rest; 137 } else 138 LogPrintf(LogERROR, "Oops, timer not found!!\n"); 139 140 tp->next = NULL; 141 tp->state = TIMER_STOPPED; 142 } 143 144 static void 145 TimerService() 146 { 147 struct pppTimer *tp, *exp, *wt; 148 149 if (LogIsKept(LogDEBUG)) 150 ShowTimers(); 151 tp = TimerList; 152 if (tp) { 153 tp->rest--; 154 if (tp->rest == 0) { 155 156 /* 157 * Multiple timers may expires at once. Create list of expired timers. 158 */ 159 exp = NULL; 160 do { 161 tp->state = TIMER_EXPIRED; 162 wt = tp->next; 163 tp->enext = exp; 164 exp = tp; 165 LogPrintf(LogDEBUG, "TimerService: Add %x to exp\n", tp); 166 tp = wt; 167 } while (tp && (tp->rest == 0)); 168 169 TimerList = tp; 170 if (TimerList == NULL) /* No timers ? */ 171 TermTimerService(); /* Terminate Timer Service */ 172 LogPrintf(LogDEBUG, "TimerService: next is %x(%d)\n", 173 TimerList, TimerList ? TimerList->rest : 0); 174 175 /* 176 * Process all expired timers. 177 */ 178 while (exp) { 179 #ifdef notdef 180 StopTimer(exp); 181 #endif 182 if (exp->func) 183 (*exp->func) (exp->arg); 184 185 /* 186 * Just Removing each item from expired list And exp->enext will be 187 * intialized at next expire in this funtion. 188 */ 189 exp = exp->enext; 190 } 191 } 192 } 193 } 194 195 void 196 ShowTimers() 197 { 198 struct pppTimer *pt; 199 200 LogPrintf(LogDEBUG, "---- Begin of Timer Service List---\n"); 201 for (pt = TimerList; pt; pt = pt->next) 202 LogPrintf(LogDEBUG, "%x: load = %d, rest = %d, state =%x\n", 203 pt, pt->load, pt->rest, pt->state); 204 LogPrintf(LogDEBUG, "---- End of Timer Service List ---\n"); 205 } 206 207 #ifdef SIGALRM 208 209 static void 210 nointr_dosleep(u_int sec, u_int usec) 211 { 212 struct timeval to, st, et; 213 214 gettimeofday(&st, NULL); 215 et.tv_sec = st.tv_sec + sec; 216 et.tv_usec = st.tv_usec + usec; 217 to.tv_sec = sec; 218 to.tv_usec = usec; 219 for (;;) { 220 if (select(0, NULL, NULL, NULL, &to) == 0 || 221 errno != EINTR) { 222 break; 223 } else { 224 gettimeofday(&to, NULL); 225 if (to.tv_sec > et.tv_sec + 1 || 226 (to.tv_sec == et.tv_sec + 1 && to.tv_usec > et.tv_usec) || 227 to.tv_sec < st.tv_sec || 228 (to.tv_sec == st.tv_sec && to.tv_usec < st.tv_usec)) { 229 LogPrintf(LogWARN, "Clock adjusted between %d and %d seconds " 230 "during sleep !\n", 231 to.tv_sec - st.tv_sec, sec + to.tv_sec - st.tv_sec); 232 st.tv_sec = to.tv_sec; 233 st.tv_usec = to.tv_usec; 234 et.tv_sec = st.tv_sec + sec; 235 et.tv_usec = st.tv_usec + usec; 236 to.tv_sec = sec; 237 to.tv_usec = usec; 238 } else if (to.tv_sec > et.tv_sec || 239 (to.tv_sec == et.tv_sec && to.tv_usec >= et.tv_usec)) { 240 break; 241 } else { 242 to.tv_sec = et.tv_sec - to.tv_sec; 243 if (et.tv_usec < to.tv_usec) { 244 to.tv_sec--; 245 to.tv_usec = 1000000 + et.tv_usec - to.tv_usec; 246 } else 247 to.tv_usec = et.tv_usec - to.tv_usec; 248 } 249 } 250 } 251 } 252 253 void 254 nointr_sleep(u_int sec) 255 { 256 nointr_dosleep(sec, 0); 257 } 258 259 void 260 nointr_usleep(u_int usec) 261 { 262 nointr_dosleep(0, usec); 263 } 264 265 static void 266 InitTimerService() 267 { 268 struct itimerval itimer; 269 270 pending_signal(SIGALRM, (void (*) (int)) TimerService); 271 itimer.it_interval.tv_sec = itimer.it_value.tv_sec = 0; 272 itimer.it_interval.tv_usec = itimer.it_value.tv_usec = TICKUNIT; 273 if (setitimer(ITIMER_REAL, &itimer, NULL) == -1) 274 LogPrintf(LogERROR, "Unable to set itimer.\n"); 275 } 276 277 void 278 TermTimerService(void) 279 { 280 struct itimerval itimer; 281 282 itimer.it_interval.tv_usec = itimer.it_interval.tv_sec = 0; 283 itimer.it_value.tv_usec = itimer.it_value.tv_sec = 0; 284 if (setitimer(ITIMER_REAL, &itimer, NULL) == -1) 285 LogPrintf(LogERROR, "Unable to set itimer.\n"); 286 pending_signal(SIGALRM, SIG_IGN); 287 } 288 289 #endif 290