1 /* $NetBSD: nsdispatch.c,v 1.34 2009/02/05 13:21:11 lukem Exp $ */ 2 3 /*- 4 * Copyright (c) 1997, 1998, 1999, 2004 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Luke Mewburn; and by Jason R. Thorpe. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 /*- 33 * Copyright (c) 2003 Networks Associates Technology, Inc. 34 * All rights reserved. 35 * 36 * Portions of this software were developed for the FreeBSD Project by 37 * Jacques A. Vidrine, Safeport Network Services, and Network 38 * Associates Laboratories, the Security Research Division of Network 39 * Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035 40 * ("CBOSS"), as part of the DARPA CHATS research program. 41 * 42 * Redistribution and use in source and binary forms, with or without 43 * modification, are permitted provided that the following conditions 44 * are met: 45 * 1. Redistributions of source code must retain the above copyright 46 * notice, this list of conditions and the following disclaimer. 47 * 2. Redistributions in binary form must reproduce the above copyright 48 * notice, this list of conditions and the following disclaimer in the 49 * documentation and/or other materials provided with the distribution. 50 * 51 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 52 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 53 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 54 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 55 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 56 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 57 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 58 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 59 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 60 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 61 * SUCH DAMAGE. 62 */ 63 64 #include <sys/cdefs.h> 65 #if defined(LIBC_SCCS) && !defined(lint) 66 __RCSID("$NetBSD: nsdispatch.c,v 1.34 2009/02/05 13:21:11 lukem Exp $"); 67 #endif /* LIBC_SCCS and not lint */ 68 69 #include "namespace.h" 70 71 #include <sys/types.h> 72 #include <sys/param.h> 73 #include <sys/stat.h> 74 #include <sys/queue.h> 75 76 #include <assert.h> 77 #ifdef __ELF__ 78 #include <dlfcn.h> 79 #endif /* __ELF__ */ 80 #include <err.h> 81 #include <fcntl.h> 82 #define _NS_PRIVATE 83 #include <nsswitch.h> 84 #include <stdarg.h> 85 #include <stdio.h> 86 #include <stdlib.h> 87 #include <string.h> 88 #include <unistd.h> 89 90 #include "reentrant.h" 91 92 extern FILE *_nsyyin; 93 extern int _nsyyparse(void); 94 95 96 #ifdef __weak_alias 97 __weak_alias(nsdispatch,_nsdispatch) 98 #endif 99 100 101 /* 102 * default sourcelist: `files' 103 */ 104 const ns_src __nsdefaultsrc[] = { 105 { NSSRC_FILES, NS_SUCCESS }, 106 { 0, 0 }, 107 }; 108 109 const ns_src __nsdefaultcompat[] = { 110 { NSSRC_COMPAT, NS_SUCCESS }, 111 { 0, 0 } 112 }; 113 114 const ns_src __nsdefaultcompat_forceall[] = { 115 { NSSRC_COMPAT, NS_SUCCESS | NS_FORCEALL }, 116 { 0, 0 } 117 }; 118 119 const ns_src __nsdefaultfiles[] = { 120 { NSSRC_FILES, NS_SUCCESS }, 121 { 0, 0 }, 122 }; 123 124 const ns_src __nsdefaultfiles_forceall[] = { 125 { NSSRC_FILES, NS_SUCCESS | NS_FORCEALL }, 126 { 0, 0 }, 127 }; 128 129 const ns_src __nsdefaultnis[] = { 130 { NSSRC_NIS, NS_SUCCESS }, 131 { 0, 0 } 132 }; 133 134 const ns_src __nsdefaultnis_forceall[] = { 135 { NSSRC_NIS, NS_SUCCESS | NS_FORCEALL }, 136 { 0, 0 } 137 }; 138 139 140 /* Database, source mappings. */ 141 static u_int _nsmapsize; 142 static ns_dbt *_nsmap; 143 144 /* Nsswitch modules. */ 145 static u_int _nsmodsize; 146 static ns_mod *_nsmod; 147 148 /* Placeholder for built-in modules' dlopen() handles. */ 149 static void *_nsbuiltin = &_nsbuiltin; 150 151 #ifdef _REENTRANT 152 /* 153 * Global nsswitch data structures are mostly read-only, but we update them 154 * when we read or re-read nsswitch.conf. 155 */ 156 static rwlock_t _nslock = RWLOCK_INITIALIZER; 157 158 /* 159 * List of threads currently in nsdispatch(). We use this to detect 160 * recursive calls and avoid reloading configuration in such cases, 161 * which could cause deadlock. 162 */ 163 struct _ns_drec { 164 LIST_ENTRY(_ns_drec) list; 165 thr_t thr; 166 }; 167 static LIST_HEAD(, _ns_drec) _ns_drec = LIST_HEAD_INITIALIZER(&_ns_drec); 168 static mutex_t _ns_drec_lock = MUTEX_INITIALIZER; 169 #endif /* _REENTRANT */ 170 171 172 /* 173 * Runtime determination of whether we are dynamically linked or not. 174 */ 175 #ifdef __ELF__ 176 extern int _DYNAMIC __weak_reference(_DYNAMIC); 177 #define is_dynamic() (&_DYNAMIC != NULL) 178 #else 179 #define is_dynamic() (0) /* don't bother - switch to ELF! */ 180 #endif /* __ELF__ */ 181 182 183 /* 184 * size of dynamic array chunk for _nsmap and _nsmap[x].srclist (and other 185 * growing arrays). 186 */ 187 #define NSELEMSPERCHUNK 8 188 189 /* 190 * Dynamically growable arrays are used for lists of databases, sources, 191 * and modules. The following "vector" API is used to isolate the 192 * common operations. 193 */ 194 typedef void (*_nsvect_free_elem)(void *); 195 196 static void * 197 _nsvect_append(const void *elem, void *vec, u_int *count, size_t esize) 198 { 199 void *p; 200 201 if ((*count % NSELEMSPERCHUNK) == 0) { 202 p = realloc(vec, (*count + NSELEMSPERCHUNK) * esize); 203 if (p == NULL) 204 return (NULL); 205 vec = p; 206 } 207 memmove((void *)(((uintptr_t)vec) + (*count * esize)), elem, esize); 208 (*count)++; 209 return (vec); 210 } 211 212 static void * 213 _nsvect_elem(u_int i, void *vec, u_int count, size_t esize) 214 { 215 216 if (i < count) 217 return ((void *)((uintptr_t)vec + (i * esize))); 218 else 219 return (NULL); 220 } 221 222 static void 223 _nsvect_free(void *vec, u_int *count, size_t esize, _nsvect_free_elem free_elem) 224 { 225 void *elem; 226 u_int i; 227 228 for (i = 0; i < *count; i++) { 229 elem = _nsvect_elem(i, vec, *count, esize); 230 if (elem != NULL) 231 (*free_elem)(elem); 232 } 233 if (vec != NULL) 234 free(vec); 235 *count = 0; 236 } 237 #define _NSVECT_FREE(v, c, s, f) \ 238 do { \ 239 _nsvect_free((v), (c), (s), (f)); \ 240 (v) = NULL; \ 241 } while (/*CONSTCOND*/0) 242 243 static int 244 _nsdbtcmp(const void *a, const void *b) 245 { 246 247 return (strcasecmp(((const ns_dbt *)a)->name, 248 ((const ns_dbt *)b)->name)); 249 } 250 251 static int 252 _nsmodcmp(const void *a, const void *b) 253 { 254 255 return (strcasecmp(((const ns_mod *)a)->name, 256 ((const ns_mod *)b)->name)); 257 } 258 259 static int 260 _nsmtabcmp(const void *a, const void *b) 261 { 262 int cmp; 263 264 cmp = strcmp(((const ns_mtab *)a)->name, 265 ((const ns_mtab *)b)->name); 266 if (cmp) 267 return (cmp); 268 269 return (strcasecmp(((const ns_mtab *)a)->database, 270 ((const ns_mtab *)b)->database)); 271 } 272 273 static void 274 _nsmodfree(ns_mod *mod) 275 { 276 277 free(__UNCONST(mod->name)); 278 if (mod->handle == NULL) 279 return; 280 if (mod->unregister != NULL) 281 (*mod->unregister)(mod->mtab, mod->mtabsize); 282 #ifdef __ELF__ 283 if (mod->handle != _nsbuiltin) 284 (void) dlclose(mod->handle); 285 #endif /* __ELF__ */ 286 } 287 288 /* 289 * Load a built-in or dyanamically linked module. If the `reg_fn' 290 * argument is non-NULL, assume a built-in module and use `reg_fn' 291 * to register it. Otherwise, search for a dynamic nsswitch module. 292 */ 293 static int 294 _nsloadmod(const char *source, nss_module_register_fn reg_fn) 295 { 296 #ifdef __ELF__ 297 char buf[PATH_MAX]; 298 #endif 299 ns_mod mod, *new; 300 301 memset(&mod, 0, sizeof(mod)); 302 mod.name = strdup(source); 303 if (mod.name == NULL) 304 return (-1); 305 306 if (reg_fn != NULL) { 307 /* 308 * The placeholder is required, as a NULL handle 309 * represents an invalid module. 310 */ 311 mod.handle = _nsbuiltin; 312 } else if (!is_dynamic()) { 313 goto out; 314 } else { 315 #ifdef __ELF__ 316 if (snprintf(buf, sizeof(buf), "nss_%s.so.%d", mod.name, 317 NSS_MODULE_INTERFACE_VERSION) >= (int)sizeof(buf)) 318 goto out; 319 mod.handle = dlopen(buf, RTLD_LOCAL | RTLD_LAZY); 320 if (mod.handle == NULL) { 321 #ifdef _NSS_DEBUG 322 /* 323 * This gets pretty annoying, since the built-in 324 * sources are not yet modules. 325 */ 326 /* XXX log some error? */ 327 #endif 328 goto out; 329 } 330 reg_fn = (nss_module_register_fn) dlsym(mod.handle, 331 "nss_module_register"); 332 if (reg_fn == NULL) { 333 (void) dlclose(mod.handle); 334 mod.handle = NULL; 335 /* XXX log some error? */ 336 goto out; 337 } 338 #else /* ! __ELF__ */ 339 mod.handle = NULL; 340 #endif /* __ELF__ */ 341 } 342 mod.mtab = (*reg_fn)(mod.name, &mod.mtabsize, &mod.unregister); 343 if (mod.mtab == NULL || mod.mtabsize == 0) { 344 #ifdef __ELF__ 345 if (mod.handle != _nsbuiltin) 346 (void) dlclose(mod.handle); 347 #endif /* __ELF__ */ 348 mod.handle = NULL; 349 /* XXX log some error? */ 350 goto out; 351 } 352 if (mod.mtabsize > 1) 353 qsort(mod.mtab, mod.mtabsize, sizeof(mod.mtab[0]), 354 _nsmtabcmp); 355 out: 356 new = _nsvect_append(&mod, _nsmod, &_nsmodsize, sizeof(*_nsmod)); 357 if (new == NULL) { 358 _nsmodfree(&mod); 359 return (-1); 360 } 361 _nsmod = new; 362 /* _nsmodsize already incremented */ 363 364 qsort(_nsmod, _nsmodsize, sizeof(*_nsmod), _nsmodcmp); 365 return (0); 366 } 367 368 static void 369 _nsloadbuiltin(void) 370 { 371 372 /* Do nothing, for now. */ 373 } 374 375 int 376 _nsdbtaddsrc(ns_dbt *dbt, const ns_src *src) 377 { 378 void *new; 379 const ns_mod *mod; 380 ns_mod modkey; 381 382 _DIAGASSERT(dbt != NULL); 383 _DIAGASSERT(src != NULL); 384 385 new = _nsvect_append(src, dbt->srclist, &dbt->srclistsize, 386 sizeof(*src)); 387 if (new == NULL) 388 return (-1); 389 dbt->srclist = new; 390 /* dbt->srclistsize already incremented */ 391 392 modkey.name = src->name; 393 mod = bsearch(&modkey, _nsmod, _nsmodsize, sizeof(*_nsmod), 394 _nsmodcmp); 395 if (mod == NULL) 396 return (_nsloadmod(src->name, NULL)); 397 398 return (0); 399 } 400 401 void 402 _nsdbtdump(const ns_dbt *dbt) 403 { 404 unsigned int i; 405 406 _DIAGASSERT(dbt != NULL); 407 408 printf("%s (%d source%s):", dbt->name, dbt->srclistsize, 409 dbt->srclistsize == 1 ? "" : "s"); 410 for (i = 0; i < dbt->srclistsize; i++) { 411 printf(" %s", dbt->srclist[i].name); 412 if (!(dbt->srclist[i].flags & 413 (NS_UNAVAIL|NS_NOTFOUND|NS_TRYAGAIN)) && 414 (dbt->srclist[i].flags & NS_SUCCESS)) 415 continue; 416 printf(" ["); 417 if (!(dbt->srclist[i].flags & NS_SUCCESS)) 418 printf(" SUCCESS=continue"); 419 if (dbt->srclist[i].flags & NS_UNAVAIL) 420 printf(" UNAVAIL=return"); 421 if (dbt->srclist[i].flags & NS_NOTFOUND) 422 printf(" NOTFOUND=return"); 423 if (dbt->srclist[i].flags & NS_TRYAGAIN) 424 printf(" TRYAGAIN=return"); 425 printf(" ]"); 426 } 427 printf("\n"); 428 } 429 430 static void 431 _nssrclist_free(ns_src **src, u_int srclistsize) 432 { 433 u_int i; 434 435 for (i = 0; i < srclistsize; i++) { 436 if ((*src)[i].name != NULL) 437 free(__UNCONST((*src)[i].name)); 438 } 439 free(*src); 440 *src = NULL; 441 } 442 443 static void 444 _nsdbtfree(ns_dbt *dbt) 445 { 446 447 _nssrclist_free(&dbt->srclist, dbt->srclistsize); 448 if (dbt->name != NULL) 449 free(__UNCONST(dbt->name)); 450 } 451 452 int 453 _nsdbtput(const ns_dbt *dbt) 454 { 455 ns_dbt *p; 456 void *new; 457 u_int i; 458 459 _DIAGASSERT(dbt != NULL); 460 461 for (i = 0; i < _nsmapsize; i++) { 462 p = _nsvect_elem(i, _nsmap, _nsmapsize, sizeof(*_nsmap)); 463 if (strcasecmp(dbt->name, p->name) == 0) { 464 /* overwrite existing entry */ 465 if (p->srclist != NULL) 466 _nssrclist_free(&p->srclist, p->srclistsize); 467 memmove(p, dbt, sizeof(*dbt)); 468 return (0); 469 } 470 } 471 new = _nsvect_append(dbt, _nsmap, &_nsmapsize, sizeof(*_nsmap)); 472 if (new == NULL) 473 return (-1); 474 _nsmap = new; 475 /* _nsmapsize already incremented */ 476 477 return (0); 478 } 479 480 /* 481 * This function is called each time nsdispatch() is called. If this 482 * is the first call, or if the configuration has changed, (re-)prepare 483 * the global data used by NSS. 484 */ 485 static int 486 _nsconfigure(void) 487 { 488 #ifdef _REENTRANT 489 static mutex_t _nsconflock = MUTEX_INITIALIZER; 490 #endif 491 static time_t _nsconfmod; 492 struct stat statbuf; 493 494 mutex_lock(&_nsconflock); 495 496 if (stat(_PATH_NS_CONF, &statbuf) == -1) { 497 /* 498 * No nsswitch.conf; just use whatever configuration we 499 * currently have, or fall back on the defaults specified 500 * by the caller. 501 */ 502 mutex_unlock(&_nsconflock); 503 return (0); 504 } 505 506 if (statbuf.st_mtime <= _nsconfmod) { 507 /* Internal state is up-to-date with nsswitch.conf. */ 508 mutex_unlock(&_nsconflock); 509 return (0); 510 } 511 512 /* 513 * Ok, we've decided we need to update the nsswitch configuration 514 * structures. Acquire a write-lock on _nslock while continuing 515 * to hold _nsconflock. Acquiring a write-lock blocks while 516 * waiting for other threads already holding a read-lock to clear. 517 * We hold _nsconflock for the duration, and update the time stamp 518 * at the end of the update operation, at which time we release 519 * both locks. 520 */ 521 rwlock_wrlock(&_nslock); 522 523 _nsyyin = fopen(_PATH_NS_CONF, "r"); 524 if (_nsyyin == NULL) { 525 /* 526 * Unable to open nsswitch.conf; behave as though the 527 * stat() above failed. Even though we have already 528 * updated _nsconfmod, if the file reappears, the 529 * mtime will change. 530 */ 531 goto out; 532 } 533 534 _NSVECT_FREE(_nsmap, &_nsmapsize, sizeof(*_nsmap), 535 (_nsvect_free_elem) _nsdbtfree); 536 _NSVECT_FREE(_nsmod, &_nsmodsize, sizeof(*_nsmod), 537 (_nsvect_free_elem) _nsmodfree); 538 539 _nsloadbuiltin(); 540 541 _nsyyparse(); 542 (void) fclose(_nsyyin); 543 if (_nsmapsize != 0) 544 qsort(_nsmap, _nsmapsize, sizeof(*_nsmap), _nsdbtcmp); 545 546 _nsconfmod = statbuf.st_mtime; 547 548 out: 549 rwlock_unlock(&_nslock); 550 mutex_unlock(&_nsconflock); 551 return (0); 552 } 553 554 static nss_method 555 _nsmethod(const char *source, const char *database, const char *method, 556 const ns_dtab disp_tab[], void **cb_data) 557 { 558 int curdisp; 559 ns_mod *mod, modkey; 560 ns_mtab *mtab, mtabkey; 561 562 if (disp_tab != NULL) { 563 for (curdisp = 0; disp_tab[curdisp].src != NULL; curdisp++) { 564 if (strcasecmp(source, disp_tab[curdisp].src) == 0) { 565 *cb_data = disp_tab[curdisp].cb_data; 566 return (disp_tab[curdisp].callback); 567 } 568 } 569 } 570 571 modkey.name = source; 572 mod = bsearch(&modkey, _nsmod, _nsmodsize, sizeof(*_nsmod), 573 _nsmodcmp); 574 if (mod != NULL && mod->handle != NULL) { 575 mtabkey.database = database; 576 mtabkey.name = method; 577 mtab = bsearch(&mtabkey, mod->mtab, mod->mtabsize, 578 sizeof(mod->mtab[0]), _nsmtabcmp); 579 if (mtab != NULL) { 580 *cb_data = mtab->mdata; 581 return (mtab->method); 582 } 583 } 584 585 *cb_data = NULL; 586 return (NULL); 587 } 588 589 int 590 /*ARGSUSED*/ 591 nsdispatch(void *retval, const ns_dtab disp_tab[], const char *database, 592 const char *method, const ns_src defaults[], ...) 593 { 594 static int _nsdispatching; 595 #ifdef _REENTRANT 596 struct _ns_drec drec, *ldrec; 597 #endif 598 va_list ap; 599 int i, result; 600 ns_dbt key; 601 const ns_dbt *dbt; 602 const ns_src *srclist; 603 int srclistsize; 604 nss_method cb; 605 void *cb_data; 606 607 /* retval may be NULL */ 608 /* disp_tab may be NULL */ 609 _DIAGASSERT(database != NULL); 610 _DIAGASSERT(method != NULL); 611 _DIAGASSERT(defaults != NULL); 612 if (database == NULL || method == NULL || defaults == NULL) 613 return (NS_UNAVAIL); 614 615 /* 616 * In both the threaded and non-threaded cases, avoid reloading 617 * the configuration if the current thread is already running 618 * nsdispatch() (i.e. recursive call). 619 * 620 * In the non-threaded case, this avoids changing the data structures 621 * while we're using them. 622 * 623 * In the threaded case, this avoids trying to take a write lock 624 * while the current thread holds a read lock (which would result 625 * in deadlock). 626 */ 627 #ifdef _REENTRANT 628 if (__isthreaded) { 629 drec.thr = thr_self(); 630 mutex_lock(&_ns_drec_lock); 631 LIST_FOREACH(ldrec, &_ns_drec, list) { 632 if (ldrec->thr == drec.thr) 633 break; 634 } 635 LIST_INSERT_HEAD(&_ns_drec, &drec, list); 636 mutex_unlock(&_ns_drec_lock); 637 if (ldrec == NULL && _nsconfigure()) { 638 mutex_lock(&_ns_drec_lock); 639 LIST_REMOVE(&drec, list); 640 mutex_unlock(&_ns_drec_lock); 641 return (NS_UNAVAIL); 642 } 643 } else 644 #endif /* _REENTRANT */ 645 if (_nsdispatching++ == 0 && _nsconfigure()) { 646 _nsdispatching--; 647 return (NS_UNAVAIL); 648 } 649 650 rwlock_rdlock(&_nslock); 651 652 key.name = database; 653 dbt = bsearch(&key, _nsmap, _nsmapsize, sizeof(*_nsmap), _nsdbtcmp); 654 if (dbt != NULL) { 655 srclist = dbt->srclist; 656 srclistsize = dbt->srclistsize; 657 } else { 658 srclist = defaults; 659 srclistsize = 0; 660 while (srclist[srclistsize].name != NULL) 661 srclistsize++; 662 } 663 result = 0; 664 665 for (i = 0; i < srclistsize; i++) { 666 cb = _nsmethod(srclist[i].name, database, method, 667 disp_tab, &cb_data); 668 result = 0; 669 if (cb != NULL) { 670 va_start(ap, defaults); 671 result = (*cb)(retval, cb_data, ap); 672 va_end(ap); 673 if (defaults[0].flags & NS_FORCEALL) 674 continue; 675 if (result & srclist[i].flags) 676 break; 677 } 678 } 679 result &= NS_STATUSMASK; /* clear private flags in result */ 680 681 rwlock_unlock(&_nslock); 682 683 #ifdef _REENTRANT 684 if (__isthreaded) { 685 mutex_lock(&_ns_drec_lock); 686 LIST_REMOVE(&drec, list); 687 mutex_unlock(&_ns_drec_lock); 688 } else 689 #endif /* _REENTRANT */ 690 _nsdispatching--; 691 692 return (result ? result : NS_NOTFOUND); 693 } 694