source: trunk/sys/libcrypto/err_def.c @ 1

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1/* crypto/err/err_def.c */
2/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
3 * All rights reserved.
4 *
5 * This package is an SSL implementation written
6 * by Eric Young (eay@cryptsoft.com).
7 * The implementation was written so as to conform with Netscapes SSL.
8 *
9 * This library is free for commercial and non-commercial use as long as
10 * the following conditions are aheared to.  The following conditions
11 * apply to all code found in this distribution, be it the RC4, RSA,
12 * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
13 * included with this distribution is covered by the same copyright terms
14 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
15 *
16 * Copyright remains Eric Young's, and as such any Copyright notices in
17 * the code are not to be removed.
18 * If this package is used in a product, Eric Young should be given attribution
19 * as the author of the parts of the library used.
20 * This can be in the form of a textual message at program startup or
21 * in documentation (online or textual) provided with the package.
22 *
23 * Redistribution and use in source and binary forms, with or without
24 * modification, are permitted provided that the following conditions
25 * are met:
26 * 1. Redistributions of source code must retain the copyright
27 *    notice, this list of conditions and the following disclaimer.
28 * 2. Redistributions in binary form must reproduce the above copyright
29 *    notice, this list of conditions and the following disclaimer in the
30 *    documentation and/or other materials provided with the distribution.
31 * 3. All advertising materials mentioning features or use of this software
32 *    must display the following acknowledgement:
33 *    "This product includes cryptographic software written by
34 *     Eric Young (eay@cryptsoft.com)"
35 *    The word 'cryptographic' can be left out if the rouines from the library
36 *    being used are not cryptographic related :-).
37 * 4. If you include any Windows specific code (or a derivative thereof) from
38 *    the apps directory (application code) you must include an acknowledgement:
39 *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
40 *
41 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
42 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
43 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
44 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
45 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
46 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
47 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
49 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
50 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
51 * SUCH DAMAGE.
52 *
53 * The licence and distribution terms for any publically available version or
54 * derivative of this code cannot be changed.  i.e. this code cannot simply be
55 * copied and put under another distribution licence
56 * [including the GNU Public Licence.]
57 */
58/* ====================================================================
59 * Copyright (c) 1998-2001 The OpenSSL Project.  All rights reserved.
60 *
61 * Redistribution and use in source and binary forms, with or without
62 * modification, are permitted provided that the following conditions
63 * are met:
64 *
65 * 1. Redistributions of source code must retain the above copyright
66 *    notice, this list of conditions and the following disclaimer.
67 *
68 * 2. Redistributions in binary form must reproduce the above copyright
69 *    notice, this list of conditions and the following disclaimer in
70 *    the documentation and/or other materials provided with the
71 *    distribution.
72 *
73 * 3. All advertising materials mentioning features or use of this
74 *    software must display the following acknowledgment:
75 *    "This product includes software developed by the OpenSSL Project
76 *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
77 *
78 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
79 *    endorse or promote products derived from this software without
80 *    prior written permission. For written permission, please contact
81 *    openssl-core@openssl.org.
82 *
83 * 5. Products derived from this software may not be called "OpenSSL"
84 *    nor may "OpenSSL" appear in their names without prior written
85 *    permission of the OpenSSL Project.
86 *
87 * 6. Redistributions of any form whatsoever must retain the following
88 *    acknowledgment:
89 *    "This product includes software developed by the OpenSSL Project
90 *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
91 *
92 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
93 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
94 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
95 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
96 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
97 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
98 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
99 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
100 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
101 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
102 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
103 * OF THE POSSIBILITY OF SUCH DAMAGE.
104 * ====================================================================
105 *
106 * This product includes cryptographic software written by Eric Young
107 * (eay@cryptsoft.com).  This product includes software written by Tim
108 * Hudson (tjh@cryptsoft.com).
109 *
110 */
111
112#include <stdio.h>
113#include <stdarg.h>
114#include <string.h>
115#include <openssl/cryptlib.h>
116#include <openssl/lhash.h>
117#include <openssl/crypto.h>
118#include <openssl/buffer.h>
119#include <openssl/bio.h>
120#include <openssl/err.h>
121
122#define err_clear_data(p,i) \
123        do { \
124        if (((p)->err_data[i] != NULL) && \
125                (p)->err_data_flags[i] & ERR_TXT_MALLOCED) \
126                {  \
127                OPENSSL_free((p)->err_data[i]); \
128                (p)->err_data[i]=NULL; \
129                } \
130        (p)->err_data_flags[i]=0; \
131        } while(0)
132
133#define err_clear(p,i) \
134        do { \
135        (p)->err_flags[i]=0; \
136        (p)->err_buffer[i]=0; \
137        err_clear_data(p,i); \
138        (p)->err_file[i]=NULL; \
139        (p)->err_line[i]= -1; \
140        } while(0)
141
142static void err_load_strings(int lib, ERR_STRING_DATA *str);
143
144static void ERR_STATE_free(ERR_STATE *s);
145
146/* Define the predeclared (but externally opaque) "ERR_FNS" type */
147struct st_ERR_FNS
148        {
149        /* Works on the "error_hash" string table */
150        LHASH *(*cb_err_get)(int create);
151        void (*cb_err_del)(void);
152        ERR_STRING_DATA *(*cb_err_get_item)(const ERR_STRING_DATA *);
153        ERR_STRING_DATA *(*cb_err_set_item)(ERR_STRING_DATA *);
154        ERR_STRING_DATA *(*cb_err_del_item)(ERR_STRING_DATA *);
155        /* Works on the "thread_hash" error-state table */
156        LHASH *(*cb_thread_get)(int create);
157        void (*cb_thread_release)(LHASH **hash);
158        ERR_STATE *(*cb_thread_get_item)(const ERR_STATE *);
159        ERR_STATE *(*cb_thread_set_item)(ERR_STATE *);
160        void (*cb_thread_del_item)(const ERR_STATE *);
161        /* Returns the next available error "library" numbers */
162        int (*cb_get_next_lib)(void);
163        };
164
165/* Predeclarations of the "err_defaults" functions */
166static LHASH *int_err_get(int create);
167static void int_err_del(void);
168static ERR_STRING_DATA *int_err_get_item(const ERR_STRING_DATA *);
169static ERR_STRING_DATA *int_err_set_item(ERR_STRING_DATA *);
170static ERR_STRING_DATA *int_err_del_item(ERR_STRING_DATA *);
171static LHASH *int_thread_get(int create);
172static void int_thread_release(LHASH **hash);
173static ERR_STATE *int_thread_get_item(const ERR_STATE *);
174static ERR_STATE *int_thread_set_item(ERR_STATE *);
175static void int_thread_del_item(const ERR_STATE *);
176static int int_err_get_next_lib(void);
177/* The static ERR_FNS table using these defaults functions */
178static const ERR_FNS err_defaults =
179        {
180        int_err_get,
181        int_err_del,
182        int_err_get_item,
183        int_err_set_item,
184        int_err_del_item,
185        int_thread_get,
186        int_thread_release,
187        int_thread_get_item,
188        int_thread_set_item,
189        int_thread_del_item,
190        int_err_get_next_lib
191        };
192
193/* The replacable table of ERR_FNS functions we use at run-time */
194static const ERR_FNS *err_fns = NULL;
195
196/* Eg. rather than using "err_get()", use "ERRFN(err_get)()". */
197#define ERRFN(a) err_fns->cb_##a
198
199/* The internal state used by "err_defaults" - as such, the setting, reading,
200 * creating, and deleting of this data should only be permitted via the
201 * "err_defaults" functions. This way, a linked module can completely defer all
202 * ERR state operation (together with requisite locking) to the implementations
203 * and state in the loading application. */
204static LHASH *int_error_hash = NULL;
205static LHASH *int_thread_hash = NULL;
206static int int_thread_hash_references = 0;
207static int int_err_library_number= ERR_LIB_USER;
208
209/* Internal function that checks whether "err_fns" is set and if not, sets it to
210 * the defaults. */
211static void err_fns_check(void)
212        {
213        if (err_fns) return;
214       
215        CRYPTO_w_lock(CRYPTO_LOCK_ERR);
216        if (!err_fns)
217                err_fns = &err_defaults;
218        CRYPTO_w_unlock(CRYPTO_LOCK_ERR);
219        }
220
221/* API functions to get or set the underlying ERR functions. */
222
223const ERR_FNS *ERR_get_implementation(void)
224        {
225        err_fns_check();
226        return err_fns;
227        }
228
229int ERR_set_implementation(const ERR_FNS *fns)
230        {
231        int ret = 0;
232
233        CRYPTO_w_lock(CRYPTO_LOCK_ERR);
234        /* It's too late if 'err_fns' is non-NULL. BTW: not much point setting
235         * an error is there?! */
236        if (!err_fns)
237                {
238                err_fns = fns;
239                ret = 1;
240                }
241        CRYPTO_w_unlock(CRYPTO_LOCK_ERR);
242        return ret;
243        }
244
245/* These are the callbacks provided to "lh_new()" when creating the LHASH tables
246 * internal to the "err_defaults" implementation. */
247
248/* static unsigned long err_hash(ERR_STRING_DATA *a); */
249static unsigned long err_hash(const void *a_void);
250/* static int err_cmp(ERR_STRING_DATA *a, ERR_STRING_DATA *b); */
251static int err_cmp(const void *a_void, const void *b_void);
252/* static unsigned long pid_hash(ERR_STATE *pid); */
253static unsigned long pid_hash(const void *pid_void);
254/* static int pid_cmp(ERR_STATE *a,ERR_STATE *pid); */
255static int pid_cmp(const void *a_void,const void *pid_void);
256
257/* The internal functions used in the "err_defaults" implementation */
258
259static LHASH *int_err_get(int create)
260        {
261        LHASH *ret = NULL;
262
263        CRYPTO_w_lock(CRYPTO_LOCK_ERR);
264        if (!int_error_hash && create)
265                {
266                CRYPTO_push_info("int_err_get (err.c)");
267                int_error_hash = lh_new(err_hash, err_cmp);
268                CRYPTO_pop_info();
269                }
270        if (int_error_hash)
271                ret = int_error_hash;
272        CRYPTO_w_unlock(CRYPTO_LOCK_ERR);
273
274        return ret;
275        }
276
277static void int_err_del(void)
278        {
279        CRYPTO_w_lock(CRYPTO_LOCK_ERR);
280        if (int_error_hash)
281                {
282                lh_free(int_error_hash);
283                int_error_hash = NULL;
284                }
285        CRYPTO_w_unlock(CRYPTO_LOCK_ERR);
286        }
287
288static ERR_STRING_DATA *int_err_get_item(const ERR_STRING_DATA *d)
289        {
290        ERR_STRING_DATA *p;
291        LHASH *hash;
292
293        err_fns_check();
294        hash = ERRFN(err_get)(0);
295        if (!hash)
296                return NULL;
297
298        CRYPTO_r_lock(CRYPTO_LOCK_ERR);
299        p = (ERR_STRING_DATA *)lh_retrieve(hash, d);
300        CRYPTO_r_unlock(CRYPTO_LOCK_ERR);
301
302        return p;
303        }
304
305static ERR_STRING_DATA *int_err_set_item(ERR_STRING_DATA *d)
306        {
307        ERR_STRING_DATA *p;
308        LHASH *hash;
309
310        err_fns_check();
311        hash = ERRFN(err_get)(1);
312        if (!hash)
313                return NULL;
314
315        CRYPTO_w_lock(CRYPTO_LOCK_ERR);
316        p = (ERR_STRING_DATA *)lh_insert(hash, d);
317        CRYPTO_w_unlock(CRYPTO_LOCK_ERR);
318
319        return p;
320        }
321
322static ERR_STRING_DATA *int_err_del_item(ERR_STRING_DATA *d)
323        {
324        ERR_STRING_DATA *p;
325        LHASH *hash;
326
327        err_fns_check();
328        hash = ERRFN(err_get)(0);
329        if (!hash)
330                return NULL;
331
332        CRYPTO_w_lock(CRYPTO_LOCK_ERR);
333        p = (ERR_STRING_DATA *)lh_delete(hash, d);
334        CRYPTO_w_unlock(CRYPTO_LOCK_ERR);
335
336        return p;
337        }
338
339static LHASH *int_thread_get(int create)
340        {
341        LHASH *ret = NULL;
342
343        CRYPTO_w_lock(CRYPTO_LOCK_ERR);
344        if (!int_thread_hash && create)
345                {
346                CRYPTO_push_info("int_thread_get (err.c)");
347                int_thread_hash = lh_new(pid_hash, pid_cmp);
348                CRYPTO_pop_info();
349                }
350        if (int_thread_hash)
351                {
352                int_thread_hash_references++;
353                ret = int_thread_hash;
354                }
355        CRYPTO_w_unlock(CRYPTO_LOCK_ERR);
356        return ret;
357        }
358
359static void int_thread_release(LHASH **hash)
360        {
361        int i;
362
363        if (hash == NULL || *hash == NULL)
364                return;
365
366        i = CRYPTO_add(&int_thread_hash_references, -1, CRYPTO_LOCK_ERR);
367
368#ifdef REF_PRINT
369        fprintf(stderr,"%4d:%s\n",int_thread_hash_references,"ERR");
370#endif
371        if (i > 0) return;
372#ifdef REF_CHECK
373        if (i < 0)
374                {
375                fprintf(stderr,"int_thread_release, bad reference count\n");
376                abort(); /* ok */
377                }
378#endif
379        *hash = NULL;
380        }
381
382static ERR_STATE *int_thread_get_item(const ERR_STATE *d)
383        {
384        ERR_STATE *p;
385        LHASH *hash;
386
387        err_fns_check();
388        hash = ERRFN(thread_get)(0);
389        if (!hash)
390                return NULL;
391
392        CRYPTO_r_lock(CRYPTO_LOCK_ERR);
393        p = (ERR_STATE *)lh_retrieve(hash, d);
394        CRYPTO_r_unlock(CRYPTO_LOCK_ERR);
395
396        ERRFN(thread_release)(&hash);
397        return p;
398        }
399
400static ERR_STATE *int_thread_set_item(ERR_STATE *d)
401        {
402        ERR_STATE *p;
403        LHASH *hash;
404
405        err_fns_check();
406        hash = ERRFN(thread_get)(1);
407        if (!hash)
408                return NULL;
409
410        CRYPTO_w_lock(CRYPTO_LOCK_ERR);
411        p = (ERR_STATE *)lh_insert(hash, d);
412        CRYPTO_w_unlock(CRYPTO_LOCK_ERR);
413
414        ERRFN(thread_release)(&hash);
415        return p;
416        }
417
418static void int_thread_del_item(const ERR_STATE *d)
419        {
420        ERR_STATE *p;
421        LHASH *hash;
422
423        err_fns_check();
424        hash = ERRFN(thread_get)(0);
425        if (!hash)
426                return;
427
428        CRYPTO_w_lock(CRYPTO_LOCK_ERR);
429        p = (ERR_STATE *)lh_delete(hash, d);
430        /* make sure we don't leak memory */
431        if (int_thread_hash_references == 1
432                && int_thread_hash && (lh_num_items(int_thread_hash) == 0))
433                {
434                lh_free(int_thread_hash);
435                int_thread_hash = NULL;
436                }
437        CRYPTO_w_unlock(CRYPTO_LOCK_ERR);
438
439        ERRFN(thread_release)(&hash);
440        if (p)
441                ERR_STATE_free(p);
442        }
443
444static int int_err_get_next_lib(void)
445        {
446        int ret;
447
448        CRYPTO_w_lock(CRYPTO_LOCK_ERR);
449        ret = int_err_library_number++;
450        CRYPTO_w_unlock(CRYPTO_LOCK_ERR);
451
452        return ret;
453        }
454
455static void ERR_STATE_free(ERR_STATE *s)
456        {
457        int i;
458
459        if (s == NULL)
460            return;
461
462        for (i=0; i<ERR_NUM_ERRORS; i++)
463                {
464                err_clear_data(s,i);
465                }
466        OPENSSL_free(s);
467        }
468
469static void err_load_strings(int lib, ERR_STRING_DATA *str)
470        {
471        while (str->error)
472                {
473                if (lib)
474                        str->error|=ERR_PACK(lib,0,0);
475                ERRFN(err_set_item)(str);
476                str++;
477                }
478        }
479
480void ERR_load_strings(int lib, ERR_STRING_DATA *str)
481        {
482        err_fns_check();
483        err_load_strings(lib, str);
484        }
485
486void ERR_unload_strings(int lib, ERR_STRING_DATA *str)
487        {
488        while (str->error)
489                {
490                if (lib)
491                        str->error|=ERR_PACK(lib,0,0);
492                ERRFN(err_del_item)(str);
493                str++;
494                }
495        }
496
497void ERR_free_strings(void)
498        {
499        err_fns_check();
500        ERRFN(err_del)();
501        }
502
503LHASH *ERR_get_string_table(void)
504        {
505        err_fns_check();
506        return ERRFN(err_get)(0);
507        }
508
509LHASH *ERR_get_err_state_table(void)
510        {
511        err_fns_check();
512        return ERRFN(thread_get)(0);
513        }
514
515void ERR_release_err_state_table(LHASH **hash)
516        {
517        err_fns_check();
518        ERRFN(thread_release)(hash);
519        }
520
521const char *ERR_lib_error_string(unsigned long e)
522        {
523        ERR_STRING_DATA d,*p;
524        unsigned long l;
525
526        err_fns_check();
527        l=ERR_GET_LIB(e);
528        d.error=ERR_PACK(l,0,0);
529        p=ERRFN(err_get_item)(&d);
530        return((p == NULL)?NULL:p->string);
531        }
532
533const char *ERR_func_error_string(unsigned long e)
534        {
535        ERR_STRING_DATA d,*p;
536        unsigned long l,f;
537
538        err_fns_check();
539        l=ERR_GET_LIB(e);
540        f=ERR_GET_FUNC(e);
541        d.error=ERR_PACK(l,f,0);
542        p=ERRFN(err_get_item)(&d);
543        return((p == NULL)?NULL:p->string);
544        }
545
546const char *ERR_reason_error_string(unsigned long e)
547        {
548        ERR_STRING_DATA d,*p=NULL;
549        unsigned long l,r;
550
551        err_fns_check();
552        l=ERR_GET_LIB(e);
553        r=ERR_GET_REASON(e);
554        d.error=ERR_PACK(l,0,r);
555        p=ERRFN(err_get_item)(&d);
556        if (!p)
557                {
558                d.error=ERR_PACK(0,0,r);
559                p=ERRFN(err_get_item)(&d);
560                }
561        return((p == NULL)?NULL:p->string);
562        }
563
564/* static unsigned long err_hash(ERR_STRING_DATA *a) */
565static unsigned long err_hash(const void *a_void)
566        {
567        unsigned long ret,l;
568
569        l=((const ERR_STRING_DATA *)a_void)->error;
570        ret=l^ERR_GET_LIB(l)^ERR_GET_FUNC(l);
571        return(ret^ret%19*13);
572        }
573
574/* static int err_cmp(ERR_STRING_DATA *a, ERR_STRING_DATA *b) */
575static int err_cmp(const void *a_void, const void *b_void)
576        {
577        return((int)(((const ERR_STRING_DATA *)a_void)->error -
578                        ((const ERR_STRING_DATA *)b_void)->error));
579        }
580
581/* static unsigned long pid_hash(ERR_STATE *a) */
582static unsigned long pid_hash(const void *a_void)
583        {
584        return(((const ERR_STATE *)a_void)->pid*13);
585        }
586
587/* static int pid_cmp(ERR_STATE *a, ERR_STATE *b) */
588static int pid_cmp(const void *a_void, const void *b_void)
589        {
590        return((int)((long)((const ERR_STATE *)a_void)->pid -
591                        (long)((const ERR_STATE *)b_void)->pid));
592        }
593#ifdef OPENSSL_FIPS
594static void int_err_remove_state(unsigned long pid)
595#else
596void ERR_remove_state(unsigned long pid)
597#endif
598        {
599        ERR_STATE tmp;
600
601        err_fns_check();
602        if (pid == 0)
603                pid=(unsigned long)CRYPTO_thread_id();
604        tmp.pid=pid;
605        /* thread_del_item automatically destroys the LHASH if the number of
606         * items reaches zero. */
607        ERRFN(thread_del_item)(&tmp);
608        }
609
610#ifdef OPENSSL_FIPS
611        static ERR_STATE *int_err_get_state(void)
612#else
613ERR_STATE *ERR_get_state(void)
614#endif
615        {
616        static ERR_STATE fallback;
617        ERR_STATE *ret,tmp,*tmpp=NULL;
618        int i;
619        unsigned long pid;
620
621        err_fns_check();
622        pid=(unsigned long)CRYPTO_thread_id();
623        tmp.pid=pid;
624        ret=ERRFN(thread_get_item)(&tmp);
625
626        /* ret == the error state, if NULL, make a new one */
627        if (ret == NULL)
628                {
629                ret=(ERR_STATE *)OPENSSL_malloc(sizeof(ERR_STATE));
630                if (ret == NULL) return(&fallback);
631                ret->pid=pid;
632                ret->top=0;
633                ret->bottom=0;
634                for (i=0; i<ERR_NUM_ERRORS; i++)
635                        {
636                        ret->err_data[i]=NULL;
637                        ret->err_data_flags[i]=0;
638                        }
639                tmpp = ERRFN(thread_set_item)(ret);
640                /* To check if insertion failed, do a get. */
641                if (ERRFN(thread_get_item)(ret) != ret)
642                        {
643                        ERR_STATE_free(ret); /* could not insert it */
644                        return(&fallback);
645                        }
646                /* If a race occured in this function and we came second, tmpp
647                 * is the first one that we just replaced. */
648                if (tmpp)
649                        ERR_STATE_free(tmpp);
650                }
651        return ret;
652        }
653
654#ifdef OPENSSL_FIPS
655void int_ERR_lib_init(void)
656        {
657        int_ERR_set_state_func(int_err_get_state, int_err_remove_state);
658        }
659#endif
660
661int ERR_get_next_error_library(void)
662        {
663        err_fns_check();
664        return ERRFN(get_next_lib)();
665        }
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