1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 22 /* 23 * Copyright (c) 1992, 2010, Oracle and/or its affiliates. All rights reserved. 24 * Copyright 2014 Garrett D'Amore <garrett@damore.org> 25 * Copyright (c) 2017, Joyent, Inc. 26 */ 27 28 /* 29 * Implementation of all external interfaces between ld.so.1 and libc. 30 * 31 * This file started as a set of routines that provided synchronization and 32 * locking operations using calls to libthread. libthread has merged with libc 33 * under the Unified Process Model (UPM), and things have gotten a lot simpler. 34 * This file continues to establish and redirect various events within ld.so.1 35 * to interfaces within libc. 36 * 37 * Until libc is loaded and relocated, any external interfaces are captured 38 * locally. Each link-map list maintains its own set of external vectors, as 39 * each link-map list typically provides its own libc. Although this per-link- 40 * map list vectoring provides a degree of flexibility, there is a protocol 41 * expected when calling various libc interfaces. 42 * 43 * i. Any new alternative link-map list should call CI_THRINIT, and then call 44 * CI_TLS_MODADD to register any TLS for each object of that link-map list 45 * (this item is labeled i. as auditors can be the first objects loaded, 46 * and they exist on their own lik-map list). 47 * 48 * ii. For the primary link-map list, CI_TLS_STATMOD must be called first to 49 * register any static TLS. This routine is called regardless of there 50 * being any TLS, as this routine also establishes the link-map list as the 51 * primary list and fixes the association of uberdata). CI_THRINIT should 52 * then be called. 53 * 54 * iii. Any objects added to an existing link-map list (primary or alternative) 55 * should call CI_TLS_MODADD to register any additional TLS. 56 * 57 * These events are established by: 58 * 59 * i. Typically, libc is loaded as part of the primary dependencies of any 60 * link-map list (since the Unified Process Model (UPM), libc can't be 61 * lazily loaded). To minimize the possibility of loading and registering 62 * objects, and then tearing them down (because of a relocation error), 63 * external vectors are established as part of load_completion(). This 64 * routine is called on completion of any operation that can cause objects 65 * to be loaded. This point of control insures the objects have been fully 66 * analyzed and relocated, and moved to their controlling link-map list. 67 * The external vectors are established prior to any .inits being fired. 68 * 69 * ii. Calls to CI_THRINIT, and CI_TLS_MODADD also occur as part of 70 * load_completion(). CI_THRINIT is only called once for each link-map 71 * control list. 72 * 73 * iii. Calls to CI_TLS_STATMOD, and CI_THRINIT occur for the primary link-map 74 * list in the final stages of setup(). 75 * 76 * The interfaces provide by libc can be divided into two families. The first 77 * family consists of those interfaces that should be called from the link-map 78 * list. It's possible that these interfaces convey state concerning the 79 * link-map list they are part of: 80 * 81 * CI_ATEXIT 82 * CI TLS_MODADD 83 * CI_TLS_MODREM 84 * CI_TLS_STATMOD 85 * CI_THRINIT 86 * 87 * The second family are global in nature, that is, the link-map list from 88 * which they are called provides no state information. In fact, for 89 * CI_BIND_GUARD, the calling link-map isn't even known. The link-map can only 90 * be deduced after ld.so.1's global lock has been obtained. Therefore, the 91 * following interfaces are also maintained as global: 92 * 93 * CI_LCMESSAGES 94 * CI_BIND_GUARD 95 * CI_BIND_CLEAR 96 * CI_THR_SELF 97 * 98 * Note, it is possible that these global interfaces are obtained from an 99 * alternative link-map list that gets torn down because of a processing 100 * failure (unlikely, because the link-map list components must be analyzed 101 * and relocated prior to load_completion(), but perhaps the tear down is still 102 * a possibility). Thus the global interfaces may have to be replaced. Once 103 * the interfaces have been obtained from the primary link-map, they can 104 * remain fixed, as the primary link-map isn't going to go anywhere. 105 * 106 * The last wrinkle in the puzzle is what happens if an alternative link-map 107 * is loaded with no libc dependency? In this case, the alternative objects 108 * can not call CI_THRINIT, can not be allowed to use TLS, and will not receive 109 * any atexit processing. 110 * 111 * The history of these external interfaces is defined by their version: 112 * 113 * TI_VERSION == 1 114 * Under this model libthread provided rw_rwlock/rw_unlock, through which 115 * all rt_mutex_lock/rt_mutex_unlock calls were vectored. 116 * Under libc/libthread these interfaces provided _sigon/_sigoff (unlike 117 * lwp/libthread that provided signal blocking via bind_guard/bind_clear). 118 * 119 * TI_VERSION == 2 120 * Under this model only libthreads bind_guard/bind_clear and thr_self 121 * interfaces were used. Both libthreads blocked signals under the 122 * bind_guard/bind_clear interfaces. Lower level locking is derived 123 * from internally bound _lwp_ interfaces. This removes recursive 124 * problems encountered when obtaining locking interfaces from libthread. 125 * The use of mutexes over reader/writer locks also enables the use of 126 * condition variables for controlling thread concurrency (allows access 127 * to objects only after their .init has completed). 128 * 129 * NOTE, the TI_VERSION indicated the ti_interface version number, where the 130 * ti_interface was a large vector of functions passed to both libc (to override 131 * the thread stub interfaces) and ld.so.1. ld.so.1 used only a small subset of 132 * these interfaces. 133 * 134 * CI_VERSION == 1 135 * Introduced with CI_VERSION & CI_ATEXIT 136 * 137 * CI_VERSION == 2 (Solaris 8 update 2). 138 * Added support for CI_LCMESSAGES 139 * 140 * CI_VERSION == 3 (Solaris 9). 141 * Added the following versions to the CI table: 142 * 143 * CI_BIND_GUARD, CI_BIND_CLEAR, CI_THR_SELF 144 * CI_TLS_MODADD, CI_TLS_MOD_REMOVE, CI_TLS_STATMOD 145 * 146 * This version introduced the DT_SUNW_RTLDINFO structure as a mechanism 147 * to handshake with ld.so.1. 148 * 149 * CI_VERSION == 4 (Solaris 10). 150 * Added the CI_THRINIT handshake as part of the libc/libthread unified 151 * process model. libc now initializes the current thread pointer from 152 * this interface (and no longer relies on the INITFIRST flag - which 153 * others have started to camp out on). 154 * 155 * CI_VERSION == 5 (Solaris 11). 156 * Use of "protected" references within libc, so that symbols are 157 * pre-bound, and don't require ld.so.1 binding. This implementation 158 * protects libc's critical regions from being vectored to auditors. 159 * 160 * CI_VERSION == 6 (Solaris 11). 161 * Added the CI_CRITICAL handshake, to allow "mem*" family to be reexposed 162 * as "global", and thus be redirected to auxiliary filters. 163 * 164 * Release summary: 165 * 166 * Solaris 8 CI_ATEXIT via _ld_libc() 167 * TI_* via _ld_concurrency() 168 * 169 * Solaris 9 CI_ATEXIT and CI_LCMESSAGES via _ld_libc() 170 * CI_* via RTLDINFO and _ld_libc() - new libthread 171 * TI_* via _ld_concurrency() - old libthread 172 * 173 * Solaris 10 CI_ATEXIT and CI_LCMESSAGES via _ld_libc() 174 * CI_* via RTLDINFO and _ld_libc() - new libthread 175 */ 176 177 #include <sys/debug.h> 178 #include <synch.h> 179 #include <signal.h> 180 #include <thread.h> 181 #include <synch.h> 182 #include <strings.h> 183 #include <stdio.h> 184 #include <libintl.h> 185 #include <debug.h> 186 #include <libc_int.h> 187 #include "_elf.h" 188 #include "_rtld.h" 189 190 /* 191 * This interface provides the unified process model communication between 192 * ld.so.1 and libc. This interface can be called a number of times: 193 * 194 * - Initially, this interface is called to process RTLDINFO. This data 195 * structure is typically provided by libc, and contains the address of 196 * libc interfaces that must be called to initialize threads information. 197 * 198 * - _ld_libc(), this interface can also be called by libc at process 199 * initialization, after libc has been loaded and relocated, but before 200 * control has been passed to any user code (.init's or main()). This 201 * call provides additional libc interface information that ld.so.1 must 202 * call during process execution. 203 * 204 * - _ld_libc() can also be called by libc during process execution to 205 * re-establish interfaces such as the locale. 206 */ 207 static void 208 get_lcinterface(Rt_map *lmp, Lc_interface *funcs) 209 { 210 int threaded = 0, entry = 0, tag; 211 Lm_list *lml; 212 Lc_desc *lcp; 213 214 if ((lmp == NULL) || (funcs == NULL)) 215 return; 216 217 /* 218 * Once the process is active, ensure we grab a lock. 219 */ 220 if (rtld_flags & RT_FL_APPLIC) 221 entry = enter(0); 222 223 lml = LIST(lmp); 224 lcp = &lml->lm_lcs[0]; 225 226 DBG_CALL(Dbg_util_nl(lml, DBG_NL_STD)); 227 228 for (tag = funcs->ci_tag; tag; tag = (++funcs)->ci_tag) { 229 char *gptr; 230 char *lptr = funcs->ci_un.ci_ptr; 231 232 DBG_CALL(Dbg_util_lcinterface(lmp, tag, lptr)); 233 234 if (tag >= CI_MAX) 235 continue; 236 237 /* 238 * Maintain all interfaces on a per-link-map basis. Note, for 239 * most interfaces, only the first interface is used for any 240 * link-map list. This prevents accidents with developers who 241 * manage to load two different versions of libc. 242 */ 243 if ((lcp[tag].lc_lmp) && 244 (tag != CI_LCMESSAGES) && (tag != CI_VERSION)) { 245 DBG_CALL(Dbg_unused_lcinterface(lmp, 246 lcp[tag].lc_lmp, tag)); 247 continue; 248 } 249 250 lcp[tag].lc_un.lc_ptr = lptr; 251 lcp[tag].lc_lmp = lmp; 252 253 gptr = glcs[tag].lc_un.lc_ptr; 254 255 /* 256 * Process any interfaces that must be maintained on a global 257 * basis. 258 */ 259 switch (tag) { 260 case CI_ATEXIT: 261 break; 262 263 case CI_LCMESSAGES: 264 /* 265 * At startup, ld.so.1 can establish a locale from one 266 * of the locale family of environment variables (see 267 * ld_str_env() and readenv_user()). During process 268 * execution the locale can also be changed by the user. 269 * This interface is called from libc should the locale 270 * be modified. Presently, only one global locale is 271 * maintained for all link-map lists, and only objects 272 * on the primrary link-map may change this locale. 273 */ 274 if ((lml->lm_flags & LML_FLG_BASELM) && 275 ((gptr == NULL) || (strcmp(gptr, lptr) != 0))) { 276 /* 277 * If we've obtained a message locale (typically 278 * supplied via libc's setlocale()), then 279 * register the locale for use in dgettext() so 280 * as to reestablish the locale for ld.so.1's 281 * messages. 282 */ 283 if (gptr) { 284 free((void *)gptr); 285 rtld_flags |= RT_FL_NEWLOCALE; 286 } 287 glcs[tag].lc_un.lc_ptr = strdup(lptr); 288 289 /* 290 * Clear any cached messages. 291 */ 292 bzero(err_strs, sizeof (err_strs)); 293 nosym_str = NULL; 294 } 295 break; 296 297 case CI_BIND_GUARD: 298 case CI_BIND_CLEAR: 299 case CI_THR_SELF: 300 case CI_CRITICAL: 301 /* 302 * If the global vector is unset, or this is the primary 303 * link-map, set the global vector. 304 */ 305 if ((gptr == NULL) || (lml->lm_flags & LML_FLG_BASELM)) 306 glcs[tag].lc_un.lc_ptr = lptr; 307 308 /* FALLTHROUGH */ 309 310 case CI_TLS_MODADD: 311 case CI_TLS_MODREM: 312 case CI_TLS_STATMOD: 313 case CI_THRINIT: 314 threaded++; 315 break; 316 317 case CI_VERSION: 318 if ((rtld_flags2 & RT_FL2_RTLDSEEN) == 0) { 319 Aliste idx; 320 Lm_list *lml2; 321 int version; 322 323 rtld_flags2 |= RT_FL2_RTLDSEEN; 324 325 version = funcs->ci_un.ci_val; 326 #if defined(CI_V_FIVE) 327 if (version >= CI_V_FIVE) { 328 thr_flg_nolock = THR_FLG_NOLOCK; 329 thr_flg_reenter = THR_FLG_REENTER; 330 } 331 #endif 332 if (version < CI_V_FOUR) 333 break; 334 335 rtld_flags2 |= RT_FL2_UNIFPROC; 336 337 /* 338 * We might have seen an auditor which is not 339 * dependent on libc. Such an auditor's link 340 * map list has LML_FLG_HOLDLOCK set. This 341 * lock needs to be dropped. Refer to 342 * audit_setup() in audit.c. 343 */ 344 if ((rtld_flags2 & RT_FL2_HASAUDIT) == 0) 345 break; 346 347 /* 348 * Yes, we did. Take care of them. 349 */ 350 for (APLIST_TRAVERSE(dynlm_list, idx, lml2)) { 351 Rt_map *map = (Rt_map *)lml2->lm_head; 352 353 if (FLAGS(map) & FLG_RT_AUDIT) { 354 lml2->lm_flags &= 355 ~LML_FLG_HOLDLOCK; 356 } 357 } 358 } 359 break; 360 361 default: 362 break; 363 } 364 } 365 366 if (threaded) { 367 /* 368 * If a version of libc gives us only a subset of the TLS 369 * interfaces, it's confused and we discard the whole lot. 370 */ 371 if (((lcp[CI_TLS_MODADD].lc_un.lc_func != NULL) && 372 (lcp[CI_TLS_MODREM].lc_un.lc_func != NULL) && 373 (lcp[CI_TLS_STATMOD].lc_un.lc_func != NULL)) == 0) { 374 lcp[CI_TLS_MODADD].lc_un.lc_func = NULL; 375 lcp[CI_TLS_MODREM].lc_un.lc_func = NULL; 376 lcp[CI_TLS_STATMOD].lc_un.lc_func = NULL; 377 } 378 379 /* 380 * Indicate that we're now thread capable. 381 */ 382 if ((lml->lm_flags & LML_FLG_RTLDLM) == 0) 383 rtld_flags |= RT_FL_THREADS; 384 } 385 386 if (entry) 387 leave(lml, 0); 388 } 389 390 /* 391 * At this point we know we have a set of objects that have been fully analyzed 392 * and relocated. Prior to the next major step of running .init sections (ie. 393 * running user code), retrieve any RTLDINFO interfaces. 394 */ 395 int 396 rt_get_extern(Lm_list *lml, Rt_map *lmp) 397 { 398 if (lml->lm_rti) { 399 Aliste idx; 400 Rti_desc *rti; 401 402 for (ALIST_TRAVERSE(lml->lm_rti, idx, rti)) 403 get_lcinterface(rti->rti_lmp, rti->rti_info); 404 405 free(lml->lm_rti); 406 lml->lm_rti = 0; 407 } 408 409 /* 410 * Perform some sanity checks. If we have TLS requirements we better 411 * have the associated external interfaces. 412 */ 413 if (lml->lm_tls && 414 (lml->lm_lcs[CI_TLS_STATMOD].lc_un.lc_func == NULL)) { 415 eprintf(lml, ERR_FATAL, MSG_INTL(MSG_TLS_NOSUPPORT), 416 NAME(lmp)); 417 return (0); 418 } 419 return (1); 420 } 421 422 /* 423 * Provide an interface for libc to communicate additional interface 424 * information. 425 */ 426 void 427 _ld_libc(void *ptr) 428 { 429 get_lcinterface(_caller(caller(), CL_EXECDEF), (Lc_interface *)ptr); 430 } 431 432 static int bindmask = 0; 433 434 int 435 rt_bind_guard(int flags) 436 { 437 int (*fptr)(int); 438 int bindflag; 439 440 if ((fptr = glcs[CI_BIND_GUARD].lc_un.lc_func) != NULL) { 441 return ((*fptr)(flags)); 442 } else { 443 bindflag = (flags & THR_FLG_RTLD); 444 if ((bindflag & bindmask) == 0) { 445 bindmask |= bindflag; 446 return (1); 447 } 448 return (0); 449 } 450 } 451 452 int 453 rt_bind_clear(int flags) 454 { 455 int (*fptr)(int); 456 int bindflag; 457 458 if ((fptr = glcs[CI_BIND_CLEAR].lc_un.lc_func) != NULL) { 459 return ((*fptr)(flags)); 460 } else { 461 bindflag = (flags & THR_FLG_RTLD); 462 if (bindflag == 0) 463 return (bindmask); 464 else { 465 bindmask &= ~bindflag; 466 return (0); 467 } 468 } 469 } 470 471 /* 472 * Make sure threads have been initialized. This interface is called once for 473 * each link-map list. 474 */ 475 void 476 rt_thr_init(Lm_list *lml) 477 { 478 int (*fptr)(void); 479 480 if ((fptr = lml->lm_lcs[CI_THRINIT].lc_un.lc_func) != NULL) { 481 lml->lm_lcs[CI_THRINIT].lc_un.lc_func = NULL; 482 483 leave(lml, thr_flg_reenter); 484 (void) (*fptr)(); 485 (void) enter(thr_flg_reenter); 486 487 /* 488 * If this is an alternative link-map list, and this is the 489 * first call to initialize threads, don't let the destination 490 * libc be deleted. It is possible that an auditors complete 491 * initialization fails, but there is presently no main link-map 492 * list. As this libc has established the thread pointer, don't 493 * delete this libc, otherwise the initialization of libc on the 494 * main link-map can be compromised during its threads 495 * initialization. 496 */ 497 if (((lml->lm_flags & LML_FLG_BASELM) == 0) && 498 ((rtld_flags2 & RT_FL2_PLMSETUP) == 0)) 499 MODE(lml->lm_lcs[CI_THRINIT].lc_lmp) |= RTLD_NODELETE; 500 } 501 } 502 503 thread_t 504 rt_thr_self() 505 { 506 thread_t (*fptr)(void); 507 508 if ((fptr = (thread_t (*)())glcs[CI_THR_SELF].lc_un.lc_func) != NULL) 509 return ((*fptr)()); 510 511 return (1); 512 } 513 514 int 515 rt_mutex_lock(Rt_lock *mp) 516 { 517 return (_lwp_mutex_lock((lwp_mutex_t *)mp)); 518 } 519 520 int 521 rt_mutex_unlock(Rt_lock *mp) 522 { 523 return (_lwp_mutex_unlock((lwp_mutex_t *)mp)); 524 } 525 526 /* 527 * Test whether we're in a libc critical region. Certain function references, 528 * like the "mem*" family, might require binding. Although these functions can 529 * safely bind to auxiliary filtees, they should not be captured by auditors. 530 */ 531 int 532 rt_critical() 533 { 534 int (*fptr)(void); 535 536 if ((fptr = glcs[CI_CRITICAL].lc_un.lc_func) != NULL) 537 return ((*fptr)()); 538 539 return (0); 540 } 541 542 /* 543 * Mutex interfaces to resolve references from any objects extracted from 544 * libc_pic.a. Note, as ld.so.1 is essentially single threaded these can be 545 * noops. 546 */ 547 #pragma weak lmutex_lock = mutex_lock 548 /* ARGSUSED */ 549 int 550 mutex_lock(mutex_t *mp) 551 { 552 return (0); 553 } 554 555 #pragma weak lmutex_unlock = mutex_unlock 556 /* ARGSUSED */ 557 int 558 mutex_unlock(mutex_t *mp) 559 { 560 return (0); 561 } 562 563 /* ARGSUSED */ 564 int 565 mutex_init(mutex_t *mp, int type, void *arg) 566 { 567 return (0); 568 } 569 570 /* ARGSUSED */ 571 int 572 mutex_destroy(mutex_t *mp) 573 { 574 return (0); 575 } 576 577 /* 578 * This is needed to satisfy sysconf() (case _SC_THREAD_STACK_MIN) 579 */ 580 size_t 581 thr_min_stack() 582 { 583 return (sizeof (uintptr_t) * 1024); 584 } 585 586 /* 587 * Local str[n]casecmp() interfaces for the dynamic linker, 588 * to avoid problems when linking with libc_pic.a 589 */ 590 int 591 strcasecmp(const char *s1, const char *s2) 592 { 593 extern int ascii_strcasecmp(const char *, const char *); 594 595 return (ascii_strcasecmp(s1, s2)); 596 } 597 598 int 599 strncasecmp(const char *s1, const char *s2, size_t n) 600 { 601 extern int ascii_strncasecmp(const char *, const char *, size_t); 602 603 return (ascii_strncasecmp(s1, s2, n)); 604 } 605 606 /* 607 * The following functions are cancellation points in libc. 608 * They are called from other functions in libc that we extract 609 * and use directly. We don't do cancellation while we are in 610 * the dynamic linker, so we redefine these to call the primitive, 611 * non-cancellation interfaces. 612 */ 613 int 614 close(int fildes) 615 { 616 extern int __close(int); 617 618 return (__close(fildes)); 619 } 620 621 int 622 fcntl(int fildes, int cmd, ...) 623 { 624 extern int __fcntl(int, int, ...); 625 intptr_t arg; 626 va_list ap; 627 628 va_start(ap, cmd); 629 arg = va_arg(ap, intptr_t); 630 va_end(ap); 631 return (__fcntl(fildes, cmd, arg)); 632 } 633 634 int 635 open(const char *path, int oflag, ...) 636 { 637 extern int __open(const char *, int, mode_t); 638 mode_t mode; 639 va_list ap; 640 641 va_start(ap, oflag); 642 mode = va_arg(ap, mode_t); 643 va_end(ap); 644 return (__open(path, oflag, mode)); 645 } 646 647 int 648 openat(int fd, const char *path, int oflag, ...) 649 { 650 extern int __openat(int, const char *, int, mode_t); 651 mode_t mode; 652 va_list ap; 653 654 va_start(ap, oflag); 655 mode = va_arg(ap, mode_t); 656 va_end(ap); 657 return (__openat(fd, path, oflag, mode)); 658 } 659 660 ssize_t 661 read(int fd, void *buf, size_t size) 662 { 663 extern ssize_t __read(int, void *, size_t); 664 return (__read(fd, buf, size)); 665 } 666 667 ssize_t 668 write(int fd, const void *buf, size_t size) 669 { 670 extern ssize_t __write(int, const void *, size_t); 671 return (__write(fd, buf, size)); 672 } 673 674 /* 675 * ASCII versions of ctype character classification functions. This avoids 676 * pulling in the entire locale framework that is in libc. 677 */ 678 679 int 680 isdigit(int c) 681 { 682 return ((c >= '0' && c <= '9') ? 1 : 0); 683 } 684 685 int 686 isupper(int c) 687 { 688 return ((c >= 'A' && c <= 'Z') ? 1 : 0); 689 } 690 691 int 692 islower(int c) 693 { 694 return ((c >= 'a' && c <= 'z') ? 1 : 0); 695 } 696 697 int 698 isspace(int c) 699 { 700 return (((c == ' ') || (c == '\t') || (c == '\r') || (c == '\n') || 701 (c == '\v') || (c == '\f')) ? 1 : 0); 702 } 703 704 int 705 isxdigit(int c) 706 { 707 return ((isdigit(c) || (c >= 'A' && c <= 'F') || 708 (c >= 'a' && c <= 'f')) ? 1 : 0); 709 } 710 711 int 712 isalpha(int c) 713 { 714 return ((isupper(c) || islower(c)) ? 1 : 0); 715 } 716 717 int 718 isalnum(int c) 719 { 720 return ((isalpha(c) || isdigit(c)) ? 1 : 0); 721 } 722 723 #if defined(__i386) || defined(__amd64) 724 /* 725 * Instead of utilizing the comm page for clock_gettime and gettimeofday, rtld 726 * uses the raw syscall instead. Doing so decreases the surface of symbols 727 * needed from libc for a modest performance cost. 728 */ 729 extern int __clock_gettime_sys(clockid_t, struct timespec *); 730 731 int 732 __clock_gettime(clockid_t clock_id, struct timespec *tp) 733 { 734 return (__clock_gettime_sys(clock_id, tp)); 735 } 736 737 int 738 gettimeofday(struct timeval *tv, void *tz) 739 { 740 if (tv != NULL) { 741 /* 742 * Perform the same logic as the libc gettimeofday() when it 743 * lacks comm page support: Make the clock_gettime syscall and 744 * divide out the tv_usec field as required. 745 */ 746 __clock_gettime_sys(CLOCK_REALTIME, (timespec_t *)tv); 747 tv->tv_usec /= 1000; 748 } 749 750 return (0); 751 } 752 #endif /* defined(__i386) || defined(__amd64) */ 753 754 /* 755 * In a similar vein to the is* functions above, we also have to define our own 756 * version of strerror, as it is implemented in terms of the locale aware 757 * strerror_l, and we'd rather not have the full set of libc symbols used here. 758 */ 759 extern const char _sys_errs[]; 760 extern const int _sys_index[]; 761 extern int _sys_num_err; 762 763 char * 764 strerror(int errnum) 765 { 766 if (errnum < _sys_num_err && errnum >= 0) { 767 return (dgettext("SUNW_OST_OSLIB", 768 (char *)&_sys_errs[_sys_index[errnum]])); 769 } 770 771 errno = EINVAL; 772 return (dgettext("SUNW_OST_OSLIB", "Unknown error")); 773 } 774