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 1.31 1998/06/27 14:18:11 brian Exp $ 21 * 22 * TODO: 23 */ 24 25 #include <errno.h> 26 #include <signal.h> 27 #include <stdio.h> 28 #include <sys/time.h> 29 #include <termios.h> 30 31 #include "log.h" 32 #include "sig.h" 33 #include "timer.h" 34 #include "descriptor.h" 35 #include "prompt.h" 36 37 static struct pppTimer *TimerList = NULL; 38 39 static void StopTimerNoBlock(struct pppTimer *); 40 41 static const char * 42 tState2Nam(u_int state) 43 { 44 static const char *StateNames[] = { "stopped", "running", "expired" }; 45 46 if (state >= sizeof StateNames / sizeof StateNames[0]) 47 return "unknown"; 48 return StateNames[state]; 49 } 50 51 void 52 timer_Stop(struct pppTimer * tp) 53 { 54 int omask; 55 56 omask = sigblock(sigmask(SIGALRM)); 57 StopTimerNoBlock(tp); 58 sigsetmask(omask); 59 } 60 61 void 62 timer_Start(struct pppTimer * tp) 63 { 64 struct pppTimer *t, *pt; 65 u_long ticks = 0; 66 int omask; 67 68 omask = sigblock(sigmask(SIGALRM)); 69 70 if (tp->state != TIMER_STOPPED) 71 StopTimerNoBlock(tp); 72 73 if (tp->load == 0) { 74 log_Printf(LogTIMER, "%s timer[%p] has 0 load!\n", tp->name, tp); 75 sigsetmask(omask); 76 return; 77 } 78 pt = NULL; 79 for (t = TimerList; t; t = t->next) { 80 if (ticks + t->rest >= tp->load) 81 break; 82 ticks += t->rest; 83 pt = t; 84 } 85 86 tp->state = TIMER_RUNNING; 87 tp->rest = tp->load - ticks; 88 89 if (t) 90 log_Printf(LogTIMER, "timer_Start: Inserting %s timer[%p] before %s " 91 "timer[%p], delta = %ld\n", tp->name, tp, t->name, t, tp->rest); 92 else 93 log_Printf(LogTIMER, "timer_Start: Inserting %s timer[%p]\n", tp->name, tp); 94 95 /* Insert given *tp just before *t */ 96 tp->next = t; 97 if (pt) { 98 pt->next = tp; 99 } else { 100 TimerList = tp; 101 timer_InitService(0); /* Start the Timer Service */ 102 } 103 if (t) 104 t->rest -= tp->rest; 105 106 sigsetmask(omask); 107 } 108 109 static void 110 StopTimerNoBlock(struct pppTimer * tp) 111 { 112 struct pppTimer *t, *pt; 113 114 /* 115 * A RUNNING timer must be removed from TimerList (->next list). 116 * A STOPPED timer isn't in any list, but may have a bogus [e]next field. 117 * An EXPIRED timer is in the ->enext list. 118 */ 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 timer_TermService(); /* Terminate Timer Service */ 134 } 135 if (t->next) 136 t->next->rest += tp->rest; 137 } else 138 log_Printf(LogERROR, "Oops, %s timer not found!!\n", tp->name); 139 140 tp->next = NULL; 141 tp->state = TIMER_STOPPED; 142 } 143 144 static void 145 TimerService(void) 146 { 147 struct pppTimer *tp, *exp, *next; 148 149 if (log_IsKept(LogTIMER)) { 150 static time_t t; /* Only show timers globally every second */ 151 time_t n = time(NULL); 152 153 if (n > t) 154 timer_Show(LogTIMER, NULL); 155 t = n; 156 } 157 158 tp = TimerList; 159 if (tp) { 160 tp->rest = 0; 161 162 /* Multiple timers might expire at once. Create a list of expired timers */ 163 exp = NULL; 164 do { 165 tp->state = TIMER_EXPIRED; 166 next = tp->next; 167 tp->enext = exp; 168 exp = tp; 169 tp = next; 170 } while (tp && tp->rest == 0); 171 172 TimerList = tp; 173 if (TimerList != NULL) /* Any timers remaining ? */ 174 timer_InitService(1); /* Restart the Timer Service */ 175 else 176 timer_TermService(); /* Stop the Timer Service */ 177 178 /* Process all expired timers */ 179 while (exp) { 180 next = exp->enext; 181 exp->enext = NULL; 182 if (exp->func) 183 (*exp->func)(exp->arg); 184 exp = next; 185 } 186 } 187 } 188 189 void 190 timer_Show(int LogLevel, struct prompt *prompt) 191 { 192 struct pppTimer *pt; 193 int rest = 0; 194 195 #define SECS(val) ((val) / SECTICKS) 196 #define HSECS(val) (((val) % SECTICKS) * 100 / SECTICKS) 197 #define DISP \ 198 "%s timer[%p]: freq = %ld.%02lds, next = %d.%02ds, state = %s\n", \ 199 pt->name, pt, SECS(pt->load), HSECS(pt->load), SECS(rest), \ 200 HSECS(rest), tState2Nam(pt->state) 201 202 if (!prompt) 203 log_Printf(LogLevel, "---- Begin of Timer Service List---\n"); 204 205 for (pt = TimerList; pt; pt = pt->next) { 206 rest += pt->rest; 207 if (prompt) 208 prompt_Printf(prompt, DISP); 209 else 210 log_Printf(LogLevel, DISP); 211 } 212 213 if (!prompt) 214 log_Printf(LogLevel, "---- End of Timer Service List ---\n"); 215 } 216 217 void 218 timer_InitService(int restart) 219 { 220 struct itimerval itimer; 221 222 if (TimerList) { 223 if (!restart) 224 sig_signal(SIGALRM, (void (*)(int))TimerService); 225 itimer.it_interval.tv_sec = 0; 226 itimer.it_interval.tv_usec = 0; 227 itimer.it_value.tv_sec = TimerList->rest / SECTICKS; 228 itimer.it_value.tv_usec = (TimerList->rest % SECTICKS) * TICKUNIT; 229 if (setitimer(ITIMER_REAL, &itimer, NULL) == -1) 230 log_Printf(LogERROR, "Unable to set itimer (%s)\n", sys_errlist[errno]); 231 } 232 } 233 234 void 235 timer_TermService(void) 236 { 237 struct itimerval itimer; 238 239 itimer.it_interval.tv_usec = itimer.it_interval.tv_sec = 0; 240 itimer.it_value.tv_usec = itimer.it_value.tv_sec = 0; 241 if (setitimer(ITIMER_REAL, &itimer, NULL) == -1) 242 log_Printf(LogERROR, "Unable to set itimer (%s)\n", sys_errlist[errno]); 243 sig_signal(SIGALRM, SIG_IGN); 244 } 245