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 2016 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 &&
372 lcp[CI_TLS_MODREM].lc_un.lc_func &&
373 lcp[CI_TLS_STATMOD].lc_un.lc_func) == NULL) {
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 void (*fptr)(void);
479
480 if ((fptr =
481 (void (*)())lml->lm_lcs[CI_THRINIT].lc_un.lc_func) != NULL) {
482 lml->lm_lcs[CI_THRINIT].lc_un.lc_func = NULL;
483
484 leave(lml, thr_flg_reenter);
485 (*fptr)();
486 (void) enter(thr_flg_reenter);
487
488 /*
489 * If this is an alternative link-map list, and this is the
490 * first call to initialize threads, don't let the destination
491 * libc be deleted. It is possible that an auditors complete
492 * initialization fails, but there is presently no main link-map
493 * list. As this libc has established the thread pointer, don't
494 * delete this libc, otherwise the initialization of libc on the
495 * main link-map can be compromised during its threads
496 * initialization.
497 */
498 if (((lml->lm_flags & LML_FLG_BASELM) == 0) &&
499 ((rtld_flags2 & RT_FL2_PLMSETUP) == 0))
500 MODE(lml->lm_lcs[CI_THRINIT].lc_lmp) |= RTLD_NODELETE;
501 }
502 }
503
504 thread_t
505 rt_thr_self()
506 {
507 thread_t (*fptr)(void);
508
509 if ((fptr = (thread_t (*)())glcs[CI_THR_SELF].lc_un.lc_func) != NULL)
510 return ((*fptr)());
511
512 return (1);
513 }
514
515 int
516 rt_mutex_lock(Rt_lock *mp)
517 {
518 return (_lwp_mutex_lock((lwp_mutex_t *)mp));
519 }
520
521 int
522 rt_mutex_unlock(Rt_lock *mp)
523 {
524 return (_lwp_mutex_unlock((lwp_mutex_t *)mp));
525 }
526
527 /*
528 * Test whether we're in a libc critical region. Certain function references,
529 * like the "mem*" family, might require binding. Although these functions can
530 * safely bind to auxiliary filtees, they should not be captured by auditors.
531 */
532 int
533 rt_critical()
534 {
535 int (*fptr)(void);
536
537 if ((fptr = glcs[CI_CRITICAL].lc_un.lc_func) != NULL)
538 return ((*fptr)());
539
540 return (0);
541 }
542
543 /*
544 * Mutex interfaces to resolve references from any objects extracted from
545 * libc_pic.a. Note, as ld.so.1 is essentially single threaded these can be
546 * noops.
547 */
548 #pragma weak lmutex_lock = mutex_lock
549 /* ARGSUSED */
550 int
551 mutex_lock(mutex_t *mp)
552 {
553 return (0);
554 }
555
556 #pragma weak lmutex_unlock = mutex_unlock
557 /* ARGSUSED */
558 int
559 mutex_unlock(mutex_t *mp)
560 {
561 return (0);
562 }
563
564 /* ARGSUSED */
565 int
566 mutex_init(mutex_t *mp, int type, void *arg)
567 {
568 return (0);
569 }
570
571 /* ARGSUSED */
572 int
573 mutex_destroy(mutex_t *mp)
574 {
575 return (0);
576 }
577
578 /*
579 * This is needed to satisfy sysconf() (case _SC_THREAD_STACK_MIN)
580 */
581 size_t
582 thr_min_stack()
583 {
584 return (sizeof (uintptr_t) * 1024);
585 }
586
587 /*
588 * Local str[n]casecmp() interfaces for the dynamic linker,
589 * to avoid problems when linking with libc_pic.a
590 */
591 int
592 strcasecmp(const char *s1, const char *s2)
593 {
594 extern int ascii_strcasecmp(const char *, const char *);
595
596 return (ascii_strcasecmp(s1, s2));
597 }
598
599 int
600 strncasecmp(const char *s1, const char *s2, size_t n)
601 {
602 extern int ascii_strncasecmp(const char *, const char *, size_t);
603
604 return (ascii_strncasecmp(s1, s2, n));
605 }
606
607 /*
608 * The following functions are cancellation points in libc.
609 * They are called from other functions in libc that we extract
610 * and use directly. We don't do cancellation while we are in
611 * the dynamic linker, so we redefine these to call the primitive,
612 * non-cancellation interfaces.
613 */
614 int
615 close(int fildes)
616 {
617 extern int __close(int);
618
619 return (__close(fildes));
620 }
621
622 int
623 fcntl(int fildes, int cmd, ...)
624 {
625 extern int __fcntl(int, int, ...);
626 intptr_t arg;
627 va_list ap;
628
629 va_start(ap, cmd);
630 arg = va_arg(ap, intptr_t);
631 va_end(ap);
632 return (__fcntl(fildes, cmd, arg));
633 }
634
635 int
636 open(const char *path, int oflag, ...)
637 {
638 extern int __open(const char *, int, mode_t);
639 mode_t mode;
640 va_list ap;
641
642 va_start(ap, oflag);
643 mode = va_arg(ap, mode_t);
644 va_end(ap);
645 return (__open(path, oflag, mode));
646 }
647
648 int
649 openat(int fd, const char *path, int oflag, ...)
650 {
651 extern int __openat(int, const char *, int, mode_t);
652 mode_t mode;
653 va_list ap;
654
655 va_start(ap, oflag);
656 mode = va_arg(ap, mode_t);
657 va_end(ap);
658 return (__openat(fd, path, oflag, mode));
659 }
660
661 ssize_t
662 read(int fd, void *buf, size_t size)
663 {
664 extern ssize_t __read(int, void *, size_t);
665 return (__read(fd, buf, size));
666 }
667
668 ssize_t
669 write(int fd, const void *buf, size_t size)
670 {
671 extern ssize_t __write(int, const void *, size_t);
672 return (__write(fd, buf, size));
673 }
674
675 /*
676 * ASCII versions of ctype character classification functions. This avoids
677 * pulling in the entire locale framework that is in libc.
678 */
679
680 int
681 isdigit(int c)
682 {
683 return ((c >= '0' && c <= '9') ? 1 : 0);
684 }
685
686 int
687 isupper(int c)
688 {
689 return ((c >= 'A' && c <= 'Z') ? 1 : 0);
690 }
691
692 int
693 islower(int c)
694 {
695 return ((c >= 'a' && c <= 'z') ? 1 : 0);
696 }
697
698 int
699 isspace(int c)
700 {
701 return (((c == ' ') || (c == '\t') || (c == '\r') || (c == '\n') ||
702 (c == '\v') || (c == '\f')) ? 1 : 0);
703 }
704
705 int
706 isxdigit(int c)
707 {
708 return ((isdigit(c) || (c >= 'A' && c <= 'F') ||
709 (c >= 'a' && c <= 'f')) ? 1 : 0);
710 }
711
712 int
713 isalpha(int c)
714 {
715 return ((isupper(c) || islower(c)) ? 1 : 0);
716 }
717
718 int
719 isalnum(int c)
720 {
721 return ((isalpha(c) || isdigit(c)) ? 1 : 0);
722 }
723
724 #if defined(__i386) || defined(__amd64)
725 /*
726 * Instead of utilizing the comm page for clock_gettime, rtld uses the raw
727 * syscall instead. Doing so decreases the surface of symbols needed from libc
728 * for a modest performance cost.
729 */
730 extern int __clock_gettime_sys(clockid_t, struct timespec *);
731
732 int
733 __clock_gettime(clockid_t clock_id, struct timespec *tp)
734 {
735 return (__clock_gettime_sys(clock_id, tp));
736 }
737 #endif /* defined(__i386) || defined(__amd64) */
738
739 /*
740 * In a similar vein to the is* functions above, we also have to define our own
741 * version of strerror, as it is implemented in terms of the locale aware
742 * strerror_l, and we'd rather not have the full set of libc symbols used here.
743 */
744 extern const char _sys_errs[];
745 extern const int _sys_index[];
746 extern int _sys_num_err;
747
748 char *
749 strerror(int errnum)
750 {
751 if (errnum < _sys_num_err && errnum >= 0) {
752 return (dgettext("SUNW_OST_OSLIB",
753 (char *)&_sys_errs[_sys_index[errnum]]));
754 }
755
756 errno = EINVAL;
757 return (dgettext("SUNW_OST_OSLIB", "Unknown error"));
758 }