src/WINNT/afsd/cm_daemon.c

   1 /*
   2  * Copyright 2000, International Business Machines Corporation and others.
   3  * All Rights Reserved.
   4  *
   5  * This software has been released under the terms of the IBM Public
   6  * License.  For details, see the LICENSE file in the top-level source
   7  * directory or online at http://www.openafs.org/dl/license10.html
   8  */
   9
  10 #include <afs/param.h>
  11 #include <afs/stds.h>
  12
  13 #include <windows.h>
  14 #include <winsock2.h>
  15 #include <iphlpapi.h>
  16 #include <stdlib.h>
  17 #include <malloc.h>
  18 #include <string.h>
  19
  20 #include "afsd.h"
  21
  22 #include <rx/rx.h>
  23 #include <rx/rx_prototypes.h>
  24 #include <WINNT/afsreg.h>
  25
  26 #include "afsicf.h"
  27
  28 /* in seconds */
  29 long cm_daemonCheckDownInterval  = 180;
  30 long cm_daemonCheckUpInterval    = 240;
  31 long cm_daemonCheckVolInterval   = 3600;
  32 long cm_daemonCheckCBInterval    = 60;
  33 long cm_daemonCheckVolCBInterval = 0;
  34 long cm_daemonCheckLockInterval  = 60;
  35 long cm_daemonTokenCheckInterval = 180;
  36 long cm_daemonCheckOfflineVolInterval = 600;
  37
  38 osi_rwlock_t cm_daemonLock;
  39
  40 long cm_bkgQueueCount;          /* # of queued requests */
  41
  42 int cm_bkgWaitingForCount;      /* true if someone's waiting for cm_bkgQueueCount to drop */
  43
  44 cm_bkgRequest_t *cm_bkgListp;           /* first elt in the list of requests */
  45 cm_bkgRequest_t *cm_bkgListEndp;        /* last elt in the list of requests */
  46
  47 static int daemon_ShutdownFlag = 0;
  48 static int cm_nDaemons = 0;
  49
  50 static EVENT_HANDLE cm_Daemon_ShutdownEvent = NULL;
  51 static EVENT_HANDLE cm_IPAddrDaemon_ShutdownEvent = NULL;
  52 static EVENT_HANDLE cm_BkgDaemon_ShutdownEvent[CM_MAX_DAEMONS] =
  53        {NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL};
  54
  55 void cm_IpAddrDaemon(long parm)
  56 {
  57     extern void smb_CheckVCs(void);
  58     char * name = "cm_IPAddrDaemon_ShutdownEvent";
  59
  60     cm_IPAddrDaemon_ShutdownEvent = thrd_CreateEvent(NULL, FALSE, FALSE, name);
  61     if ( GetLastError() == ERROR_ALREADY_EXISTS )
  62         afsi_log("Event Object Already Exists: %s", name);
  63
  64     rx_StartClientThread();
  65
  66     while (daemon_ShutdownFlag == 0) {
  67         DWORD Result;
  68
  69         thrd_SetEvent(cm_IPAddrDaemon_ShutdownEvent);
  70         Result = NotifyAddrChange(NULL,NULL);
  71         if (Result == NO_ERROR && daemon_ShutdownFlag == 0) {
  72             thrd_ResetEvent(cm_IPAddrDaemon_ShutdownEvent);
  73             Sleep(2500);
  74             if (daemon_ShutdownFlag == 0) {
  75                 osi_Log0(afsd_logp, "cm_IpAddrDaemon CheckDownServers");
  76                 cm_CheckServers(CM_FLAG_CHECKVLDBSERVERS | CM_FLAG_CHECKUPSERVERS | CM_FLAG_CHECKDOWNSERVERS, NULL);
  77                 cm_ForceNewConnectionsAllServers();
  78                 cm_CheckServers(CM_FLAG_CHECKFILESERVERS | CM_FLAG_CHECKUPSERVERS | CM_FLAG_CHECKDOWNSERVERS, NULL);
  79                 smb_CheckVCs();
  80                 cm_VolStatus_Network_Addr_Change();
  81             }
  82         }
  83     }
  84
  85     thrd_SetEvent(cm_IPAddrDaemon_ShutdownEvent);
  86 }
  87
  88 void cm_BkgDaemon(void * parm)
  89 {
  90     cm_bkgRequest_t *rp;
  91     afs_int32 code;
  92     char name[32] = "";
  93     long daemonID = (long)parm;
  94
  95     snprintf(name, sizeof(name), "cm_BkgDaemon_ShutdownEvent%d", daemonID);
  96
  97     cm_BkgDaemon_ShutdownEvent[daemonID] = thrd_CreateEvent(NULL, FALSE, FALSE, name);
  98     if ( GetLastError() == ERROR_ALREADY_EXISTS )
  99         afsi_log("Event Object Already Exists: %s", name);
 100
 101     rx_StartClientThread();
 102
 103     lock_ObtainWrite(&cm_daemonLock);
 104     while (daemon_ShutdownFlag == 0) {
 105         if (!cm_bkgListEndp) {
 106             osi_SleepW((LONG_PTR)&cm_bkgListp, &cm_daemonLock);
 107             lock_ObtainWrite(&cm_daemonLock);
 108             continue;
 109         }
 110
 111         /* we found a request */
 112         for (rp = cm_bkgListEndp; rp; rp = (cm_bkgRequest_t *) osi_QPrev(&rp->q))
 113         {
 114             if (cm_ServerAvailable(&rp->scp->fid, rp->userp))
 115                 break;
 116         }
 117         if (rp == NULL) {
 118             /* we couldn't find a request that we could process at the current time */
 119             lock_ReleaseWrite(&cm_daemonLock);
 120             Sleep(1000);
 121             lock_ObtainWrite(&cm_daemonLock);
 122             continue;
 123         }
 124
 125         osi_QRemoveHT((osi_queue_t **) &cm_bkgListp, (osi_queue_t **) &cm_bkgListEndp, &rp->q);
 126         osi_assertx(cm_bkgQueueCount-- > 0, "cm_bkgQueueCount 0");
 127         lock_ReleaseWrite(&cm_daemonLock);
 128
 129         osi_Log1(afsd_logp,"cm_BkgDaemon processing request 0x%p", rp);
 130
 131 #ifdef DEBUG_REFCOUNT
 132         osi_Log2(afsd_logp,"cm_BkgDaemon (before) scp 0x%x ref %d",rp->scp, rp->scp->refCount);
 133 #endif
 134         code = (*rp->procp)(rp->scp, rp->p1, rp->p2, rp->p3, rp->p4, rp->userp);
 135 #ifdef DEBUG_REFCOUNT
 136         osi_Log2(afsd_logp,"cm_BkgDaemon (after) scp 0x%x ref %d",rp->scp, rp->scp->refCount);
 137 #endif
 138         if (code == 0) {
 139             cm_ReleaseUser(rp->userp);
 140             cm_ReleaseSCache(rp->scp);
 141             free(rp);
 142         }
 143
 144         lock_ObtainWrite(&cm_daemonLock);
 145
 146         switch ( code ) {
 147         case 0: /* success */
 148             osi_Log1(afsd_logp,"cm_BkgDaemon SUCCESS: request 0x%p", rp);
 149             break;
 150         case CM_ERROR_TIMEDOUT: /* or server restarting */
 151         case CM_ERROR_RETRY:
 152         case CM_ERROR_WOULDBLOCK:
 153         case CM_ERROR_ALLBUSY:
 154         case CM_ERROR_ALLDOWN:
 155         case CM_ERROR_ALLOFFLINE:
 156         case CM_ERROR_PARTIALWRITE:
 157             osi_Log2(afsd_logp,"cm_BkgDaemon re-queueing failed request 0x%p code 0x%x",
 158                      rp, code);
 159             cm_bkgQueueCount++;
 160             osi_QAddT((osi_queue_t **) &cm_bkgListp, (osi_queue_t **)&cm_bkgListEndp, &rp->q);
 161             break;
 162         default:
 163             osi_Log2(afsd_logp,"cm_BkgDaemon FAILED: request dropped 0x%p code 0x%x",
 164                      rp, code);
 165         }
 166     }
 167     lock_ReleaseWrite(&cm_daemonLock);
 168
 169     thrd_SetEvent(cm_BkgDaemon_ShutdownEvent[daemonID]);
 170
 171 }
 172
 173 void cm_QueueBKGRequest(cm_scache_t *scp, cm_bkgProc_t *procp, afs_uint32 p1, afs_uint32 p2, afs_uint32 p3, afs_uint32 p4,
 174         cm_user_t *userp)
 175 {
 176     cm_bkgRequest_t *rp;
 177
 178     rp = malloc(sizeof(*rp));
 179     memset(rp, 0, sizeof(*rp));
 180
 181     cm_HoldSCache(scp);
 182     rp->scp = scp;
 183     cm_HoldUser(userp);
 184     rp->userp = userp;
 185     rp->procp = procp;
 186     rp->p1 = p1;
 187     rp->p2 = p2;
 188     rp->p3 = p3;
 189     rp->p4 = p4;
 190
 191     lock_ObtainWrite(&cm_daemonLock);
 192     cm_bkgQueueCount++;
 193     osi_QAdd((osi_queue_t **) &cm_bkgListp, &rp->q);
 194     if (!cm_bkgListEndp)
 195         cm_bkgListEndp = rp;
 196     lock_ReleaseWrite(&cm_daemonLock);
 197
 198     osi_Wakeup((LONG_PTR) &cm_bkgListp);
 199 }
 200
 201 static int
 202 IsWindowsFirewallPresent(void)
 203 {
 204     SC_HANDLE scm;
 205     SC_HANDLE svc;
 206     BOOLEAN flag;
 207     BOOLEAN result = FALSE;
 208     LPQUERY_SERVICE_CONFIG pConfig = NULL;
 209     DWORD BufSize;
 210     LONG status;
 211
 212     /* Open services manager */
 213     scm = OpenSCManager(NULL, NULL, GENERIC_READ);
 214     if (!scm) return FALSE;
 215
 216     /* Open Windows Firewall service */
 217     svc = OpenService(scm, "MpsSvc", SERVICE_QUERY_CONFIG);
 218     if (!svc) {
 219         afsi_log("MpsSvc Service could not be opened for query: 0x%x", GetLastError());
 220         svc = OpenService(scm, "SharedAccess", SERVICE_QUERY_CONFIG);
 221         if (!svc)
 222             afsi_log("SharedAccess Service could not be opened for query: 0x%x", GetLastError());
 223     }
 224     if (!svc)
 225         goto close_scm;
 226
 227     /* Query Windows Firewall service config, first just to get buffer size */
 228     /* Expected to fail, so don't test return value */
 229     (void) QueryServiceConfig(svc, NULL, 0, &BufSize);
 230     status = GetLastError();
 231     if (status != ERROR_INSUFFICIENT_BUFFER)
 232         goto close_svc;
 233
 234     /* Allocate buffer */
 235     pConfig = (LPQUERY_SERVICE_CONFIG)GlobalAlloc(GMEM_FIXED,BufSize);
 236     if (!pConfig)
 237         goto close_svc;
 238
 239     /* Query Windows Firewall service config, this time for real */
 240     flag = QueryServiceConfig(svc, pConfig, BufSize, &BufSize);
 241     if (!flag) {
 242         afsi_log("QueryServiceConfig failed: 0x%x", GetLastError());
 243         goto free_pConfig;
 244     }
 245
 246     /* Is it autostart? */
 247     afsi_log("AutoStart 0x%x", pConfig->dwStartType);
 248     if (pConfig->dwStartType < SERVICE_DEMAND_START)
 249         result = TRUE;
 250
 251   free_pConfig:
 252     GlobalFree(pConfig);
 253   close_svc:
 254     CloseServiceHandle(svc);
 255   close_scm:
 256     CloseServiceHandle(scm);
 257
 258     return result;
 259 }
 260
 261 void
 262 cm_DaemonCheckInit(void)
 263 {
 264     HKEY parmKey;
 265     DWORD dummyLen;
 266     DWORD dummy;
 267     DWORD code;
 268
 269     code = RegOpenKeyEx(HKEY_LOCAL_MACHINE, AFSREG_CLT_SVC_PARAM_SUBKEY,
 270                          0, KEY_QUERY_VALUE, &parmKey);
 271     if (code)
 272         return;
 273
 274     dummyLen = sizeof(DWORD);
 275     code = RegQueryValueEx(parmKey, "daemonCheckDownInterval", NULL, NULL,
 276                             (BYTE *) &dummy, &dummyLen);
 277     if (code == ERROR_SUCCESS)
 278         cm_daemonCheckDownInterval = dummy;
 279     afsi_log("daemonCheckDownInterval is %d", cm_daemonCheckDownInterval);
 280
 281     dummyLen = sizeof(DWORD);
 282     code = RegQueryValueEx(parmKey, "daemonCheckUpInterval", NULL, NULL,
 283                             (BYTE *) &dummy, &dummyLen);
 284     if (code == ERROR_SUCCESS)
 285         cm_daemonCheckUpInterval = dummy;
 286     afsi_log("daemonCheckUpInterval is %d", cm_daemonCheckUpInterval);
 287
 288     dummyLen = sizeof(DWORD);
 289     code = RegQueryValueEx(parmKey, "daemonCheckVolInterval", NULL, NULL,
 290                             (BYTE *) &dummy, &dummyLen);
 291     if (code == ERROR_SUCCESS)
 292         cm_daemonCheckVolInterval = dummy;
 293     afsi_log("daemonCheckVolInterval is %d", cm_daemonCheckVolInterval);
 294
 295     dummyLen = sizeof(DWORD);
 296     code = RegQueryValueEx(parmKey, "daemonCheckCBInterval", NULL, NULL,
 297                             (BYTE *) &dummy, &dummyLen);
 298     if (code == ERROR_SUCCESS)
 299         cm_daemonCheckCBInterval = dummy;
 300     afsi_log("daemonCheckCBInterval is %d", cm_daemonCheckCBInterval);
 301
 302     dummyLen = sizeof(DWORD);
 303     code = RegQueryValueEx(parmKey, "daemonCheckVolCBInterval", NULL, NULL,
 304                             (BYTE *) &dummy, &dummyLen);
 305     if (code == ERROR_SUCCESS)
 306         cm_daemonCheckVolCBInterval = dummy;
 307     afsi_log("daemonCheckVolCBInterval is %d", cm_daemonCheckVolCBInterval);
 308
 309     dummyLen = sizeof(DWORD);
 310     code = RegQueryValueEx(parmKey, "daemonCheckLockInterval", NULL, NULL,
 311                             (BYTE *) &dummy, &dummyLen);
 312     if (code == ERROR_SUCCESS)
 313         cm_daemonCheckLockInterval = dummy;
 314     afsi_log("daemonCheckLockInterval is %d", cm_daemonCheckLockInterval);
 315
 316     dummyLen = sizeof(DWORD);
 317     code = RegQueryValueEx(parmKey, "daemonCheckTokenInterval", NULL, NULL,
 318                             (BYTE *) &dummy, &dummyLen);
 319     if (code == ERROR_SUCCESS)
 320         cm_daemonTokenCheckInterval = dummy;
 321     afsi_log("daemonCheckTokenInterval is %d", cm_daemonTokenCheckInterval);
 322
 323     dummyLen = sizeof(DWORD);
 324     code = RegQueryValueEx(parmKey, "daemonCheckOfflineVolInterval", NULL, NULL,
 325                             (BYTE *) &dummy, &dummyLen);
 326     if (code == ERROR_SUCCESS)
 327         cm_daemonCheckOfflineVolInterval = dummy;
 328     afsi_log("daemonCheckOfflineVolInterval is %d", cm_daemonCheckOfflineVolInterval);
 329
 330     RegCloseKey(parmKey);
 331 }
 332
 333 /* periodic check daemon */
 334 void cm_Daemon(long parm)
 335 {
 336     time_t now;
 337     time_t lastLockCheck;
 338     time_t lastVolCheck;
 339     time_t lastCBExpirationCheck;
 340     time_t lastVolCBRenewalCheck;
 341     time_t lastDownServerCheck;
 342     time_t lastUpServerCheck;
 343     time_t lastTokenCacheCheck;
 344     time_t lastBusyVolCheck;
 345     char thostName[200];
 346     unsigned long code;
 347     struct hostent *thp;
 348     HMODULE hHookDll;
 349     char * name = "cm_Daemon_ShutdownEvent";
 350     int configureFirewall = IsWindowsFirewallPresent();
 351
 352     cm_Daemon_ShutdownEvent = thrd_CreateEvent(NULL, FALSE, FALSE, name);
 353     if ( GetLastError() == ERROR_ALREADY_EXISTS )
 354         afsi_log("Event Object Already Exists: %s", name);
 355
 356     if (!configureFirewall) {
 357         afsi_log("No Windows Firewall detected");
 358     }
 359
 360     /* ping all file servers, up or down, with unauthenticated connection,
 361      * to find out whether we have all our callbacks from the server still.
 362      * Also, ping down VLDBs.
 363      */
 364     /*
 365      * Seed the random number generator with our own address, so that
 366      * clients starting at the same time don't all do vol checks at the
 367      * same time.
 368      */
 369     gethostname(thostName, sizeof(thostName));
 370     thp = gethostbyname(thostName);
 371     if (thp == NULL)    /* In djgpp, gethostname returns the netbios
 372                            name of the machine.  gethostbyname will fail
 373                            looking this up if it differs from DNS name. */
 374         code = 0;
 375     else
 376         memcpy(&code, thp->h_addr_list[0], 4);
 377
 378     srand(ntohl(code));
 379
 380     cm_DaemonCheckInit();
 381
 382     now = osi_Time();
 383     lastVolCheck = now - cm_daemonCheckVolInterval/2 + (rand() % cm_daemonCheckVolInterval);
 384     lastCBExpirationCheck = now - cm_daemonCheckCBInterval/2 + (rand() % cm_daemonCheckCBInterval);
 385     if (cm_daemonCheckVolCBInterval)
 386         lastVolCBRenewalCheck = now - cm_daemonCheckVolCBInterval/2 + (rand() % cm_daemonCheckVolCBInterval);
 387     lastLockCheck = now - cm_daemonCheckLockInterval/2 + (rand() % cm_daemonCheckLockInterval);
 388     lastDownServerCheck = now - cm_daemonCheckDownInterval/2 + (rand() % cm_daemonCheckDownInterval);
 389     lastUpServerCheck = now - cm_daemonCheckUpInterval/2 + (rand() % cm_daemonCheckUpInterval);
 390     lastTokenCacheCheck = now - cm_daemonTokenCheckInterval/2 + (rand() % cm_daemonTokenCheckInterval);
 391     lastBusyVolCheck = now - cm_daemonCheckOfflineVolInterval/2 * (rand() % cm_daemonCheckOfflineVolInterval);
 392
 393     while (daemon_ShutdownFlag == 0) {
 394         /* check to see if the listener threads halted due to network
 395          * disconnect or other issues.  If so, attempt to restart them.
 396          */
 397         smb_RestartListeners();
 398
 399         if (daemon_ShutdownFlag == 1)
 400             break;
 401
 402         if (configureFirewall) {
 403             /* Open Microsoft Firewall to allow in port 7001 */
 404             switch (icf_CheckAndAddAFSPorts(AFS_PORTSET_CLIENT)) {
 405             case 0:
 406                 afsi_log("Windows Firewall Configuration succeeded");
 407                 configureFirewall = 0;
 408                 break;
 409             case 1:
 410                 afsi_log("Invalid Windows Firewall Port Set");
 411                 break;
 412             case 2:
 413                 afsi_log("Unable to open Windows Firewall Profile");
 414                 break;
 415             case 3:
 416                 afsi_log("Unable to create/modify Windows Firewall Port entries");
 417                 break;
 418             default:
 419                 afsi_log("Unknown Windows Firewall Configuration error");
 420             }
 421         }
 422
 423         /* find out what time it is */
 424         now = osi_Time();
 425
 426         /* check down servers */
 427         if (now > lastDownServerCheck + cm_daemonCheckDownInterval &&
 428             daemon_ShutdownFlag == 0) {
 429             lastDownServerCheck = now;
 430             osi_Log0(afsd_logp, "cm_Daemon CheckDownServers");
 431             cm_CheckServers(CM_FLAG_CHECKDOWNSERVERS, NULL);
 432             if (daemon_ShutdownFlag == 1)
 433                 break;
 434             now = osi_Time();
 435         }
 436
 437         /* check up servers */
 438         if (now > lastUpServerCheck + cm_daemonCheckUpInterval &&
 439             daemon_ShutdownFlag == 0) {
 440             lastUpServerCheck = now;
 441             osi_Log0(afsd_logp, "cm_Daemon CheckUpServers");
 442             cm_CheckServers(CM_FLAG_CHECKUPSERVERS, NULL);
 443             if (daemon_ShutdownFlag == 1)
 444                 break;
 445             now = osi_Time();
 446         }
 447
 448         if (now > lastVolCheck + cm_daemonCheckVolInterval &&
 449             daemon_ShutdownFlag == 0) {
 450             lastVolCheck = now;
 451             cm_RefreshVolumes();
 452             if (daemon_ShutdownFlag == 1)
 453                 break;
 454             now = osi_Time();
 455         }
 456
 457         if (cm_daemonCheckVolCBInterval &&
 458             now > lastVolCBRenewalCheck + cm_daemonCheckVolCBInterval &&
 459             daemon_ShutdownFlag == 0) {
 460             lastVolCBRenewalCheck = now;
 461             cm_VolumeRenewROCallbacks();
 462             if (daemon_ShutdownFlag == 1)
 463                 break;
 464             now = osi_Time();
 465         }
 466
 467         if (now > lastBusyVolCheck + cm_daemonCheckOfflineVolInterval &&
 468             daemon_ShutdownFlag == 0) {
 469             lastVolCheck = now;
 470             cm_CheckOfflineVolumes();
 471             if (daemon_ShutdownFlag == 1)
 472                 break;
 473             now = osi_Time();
 474         }
 475
 476         if (now > lastCBExpirationCheck + cm_daemonCheckCBInterval &&
 477             daemon_ShutdownFlag == 0) {
 478             lastCBExpirationCheck = now;
 479             cm_CheckCBExpiration();
 480             if (daemon_ShutdownFlag == 1)
 481                 break;
 482             now = osi_Time();
 483         }
 484
 485         if (now > lastLockCheck + cm_daemonCheckLockInterval &&
 486             daemon_ShutdownFlag == 0) {
 487             lastLockCheck = now;
 488             cm_CheckLocks();
 489             if (daemon_ShutdownFlag == 1)
 490                 break;
 491             now = osi_Time();
 492         }
 493
 494         if (now > lastTokenCacheCheck + cm_daemonTokenCheckInterval &&
 495             daemon_ShutdownFlag == 0) {
 496             lastTokenCacheCheck = now;
 497             cm_CheckTokenCache(now);
 498             if (daemon_ShutdownFlag == 1)
 499                 break;
 500             now = osi_Time();
 501         }
 502
 503         /* allow an exit to be called prior to stopping the service */
 504         hHookDll = LoadLibrary(AFSD_HOOK_DLL);
 505         if (hHookDll)
 506         {
 507             BOOL hookRc = TRUE;
 508             AfsdDaemonHook daemonHook = ( AfsdDaemonHook ) GetProcAddress(hHookDll, AFSD_DAEMON_HOOK);
 509             if (daemonHook)
 510             {
 511                 hookRc = daemonHook();
 512             }
 513             FreeLibrary(hHookDll);
 514             hHookDll = NULL;
 515
 516             if (hookRc == FALSE)
 517             {
 518                 SetEvent(WaitToTerminate);
 519             }
 520         }
 521
 522         if (daemon_ShutdownFlag == 1) {
 523             break;
 524         }
 525         thrd_Sleep(30 * 1000);          /* sleep 30 seconds */
 526     }
 527     thrd_SetEvent(cm_Daemon_ShutdownEvent);
 528 }
 529
 530 void cm_DaemonShutdown(void)
 531 {
 532     int i;
 533     DWORD code;
 534
 535     daemon_ShutdownFlag = 1;
 536     osi_Wakeup((LONG_PTR) &cm_bkgListp);
 537
 538     /* wait for shutdown */
 539     if (cm_Daemon_ShutdownEvent)
 540         code = thrd_WaitForSingleObject_Event(cm_Daemon_ShutdownEvent, INFINITE);
 541
 542     for ( i=0; i<cm_nDaemons; i++) {
 543         if (cm_BkgDaemon_ShutdownEvent[i])
 544             code = thrd_WaitForSingleObject_Event(cm_BkgDaemon_ShutdownEvent[i], INFINITE);
 545     }
 546
 547     if (cm_IPAddrDaemon_ShutdownEvent)
 548         code = thrd_WaitForSingleObject_Event(cm_IPAddrDaemon_ShutdownEvent, INFINITE);
 549 }
 550
 551 void cm_InitDaemon(int nDaemons)
 552 {
 553     static osi_once_t once;
 554     long pid;
 555     thread_t phandle;
 556     int i;
 557
 558     cm_nDaemons = (nDaemons > CM_MAX_DAEMONS) ? CM_MAX_DAEMONS : nDaemons;
 559
 560     if (osi_Once(&once)) {
 561         lock_InitializeRWLock(&cm_daemonLock, "cm_daemonLock");
 562         osi_EndOnce(&once);
 563
 564         /* creating IP Address Change monitor daemon */
 565         phandle = thrd_Create((SecurityAttrib) 0, 0,
 566                                (ThreadFunc) cm_IpAddrDaemon, 0, 0, &pid, "cm_IpAddrDaemon");
 567         osi_assertx(phandle != NULL, "cm_IpAddrDaemon thread creation failure");
 568         thrd_CloseHandle(phandle);
 569
 570         /* creating pinging daemon */
 571         phandle = thrd_Create((SecurityAttrib) 0, 0,
 572                                (ThreadFunc) cm_Daemon, 0, 0, &pid, "cm_Daemon");
 573         osi_assertx(phandle != NULL, "cm_Daemon thread creation failure");
 574         thrd_CloseHandle(phandle);
 575
 576         for(i=0; i < cm_nDaemons; i++) {
 577             phandle = thrd_Create((SecurityAttrib) 0, 0,
 578                                    (ThreadFunc) cm_BkgDaemon, (LPVOID)i, 0, &pid,
 579                                    "cm_BkgDaemon");
 580             osi_assertx(phandle != NULL, "cm_BkgDaemon thread creation failure");
 581             thrd_CloseHandle(phandle);
 582         }
 583     }
 584 }