summaryrefslogtreecommitdiffstats
path: root/rubbos/app/httpd-2.0.64/srclib/apr/dso/aix/dso.c
blob: 25f6262af867cac2d55bc709b5682a2edb7a6731 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
/* Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

/*
 *  dso.c -- DSO system function emulation for AIX
 *
 *  This is *only* intended for AIX < 4.3.
 */

/*
 *  Based on libdl (dlfcn.c/dlfcn.h) which is
 *  Copyright (c) 1992,1993,1995,1996,1997,1988
 *  Jens-Uwe Mager, Helios Software GmbH, Hannover, Germany.
 *
 *  Not derived from licensed software.
 *
 *  Permission is granted to freely use, copy, modify, and redistribute
 *  this software, provided that the author is not construed to be liable
 *  for any results of using the software, alterations are clearly marked
 *  as such, and this notice is not modified.
 *
 *  Changes marked with `--jwe' were made on April 7 1996 by
 *  John W. Eaton <jwe@bevo.che.wisc.edu> to support g++ 
 *
 *  Bundled, stripped and adjusted on April 1998 as one single source file 
 *  for inclusion into the Apache HTTP server by 
 *  Ralf S. Engelschall <rse@apache.org>
 *
 *  Added to APR by David Reid April 2000
 */

#include <stdio.h>
#include <errno.h>
#include <string.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/ldr.h>
#include <a.out.h>
#include "apr_arch_dso.h"
#include "apr_portable.h"

#if APR_HAS_DSO

#undef FREAD
#undef FWRITE
#include <ldfcn.h>

/*
 * AIX 4.3 does remove some useful definitions from ldfcn.h. Define
 * these here to compensate for that lossage.
 */
#ifndef BEGINNING
#define BEGINNING SEEK_SET
#endif
#ifndef FSEEK
#define FSEEK(ldptr,o,p)   fseek(IOPTR(ldptr),(p==BEGINNING)?(OFFSET(ldptr) +o):o,p)
#endif
#ifndef FREAD
#define FREAD(p,s,n,ldptr) fread(p,s,n,IOPTR(ldptr))
#endif

/*
 * Mode flags for the dlopen routine.
 */
#undef  RTLD_LAZY
#define RTLD_LAZY	1	/* lazy function call binding */
#undef  RTLD_NOW
#define RTLD_NOW	2	/* immediate function call binding */
#undef  RTLD_GLOBAL
#define RTLD_GLOBAL	0x100	/* allow symbols to be global */

/*
 * To be able to initialize, a library may provide a dl_info structure
 * that contains functions to be called to initialize and terminate.
 */
struct dl_info {
    void (*init) (void);
    void (*fini) (void);
};

/* APR functions...
 *
 * As the AIX functions have been declared in the header file we just
 * add the basic "wrappers" here.
 */

APR_DECLARE(apr_status_t) apr_os_dso_handle_put(apr_dso_handle_t **aprdso,
                                                apr_os_dso_handle_t osdso,
                                                apr_pool_t *pool)
{
    *aprdso = apr_pcalloc(pool, sizeof **aprdso);
    (*aprdso)->handle = osdso;
    (*aprdso)->pool = pool;
    return APR_SUCCESS;
}

APR_DECLARE(apr_status_t) apr_os_dso_handle_get(apr_os_dso_handle_t *osdso,
                                                apr_dso_handle_t *aprdso)
{
    *osdso = aprdso->handle;
    return APR_SUCCESS;
}

static apr_status_t dso_cleanup(void *thedso)
{
    apr_dso_handle_t *dso = thedso;

    if (dso->handle != NULL && dlclose(dso->handle) != 0)
        return APR_EINIT;
    dso->handle = NULL;

    return APR_SUCCESS;
}

APR_DECLARE(apr_status_t) apr_dso_load(apr_dso_handle_t **res_handle, 
                                       const char *path, apr_pool_t *ctx)
{
    void *os_handle = dlopen((char *)path, RTLD_NOW | RTLD_GLOBAL);

    *res_handle = apr_pcalloc(ctx, sizeof(*res_handle));

    if(os_handle == NULL) {
        (*res_handle)->errormsg = dlerror();       
        return APR_EDSOOPEN;
    }

    (*res_handle)->handle = (void*)os_handle;
    (*res_handle)->pool = ctx;
    (*res_handle)->errormsg = NULL;

    apr_pool_cleanup_register(ctx, *res_handle, dso_cleanup, apr_pool_cleanup_null);

    return APR_SUCCESS;
}

APR_DECLARE(apr_status_t) apr_dso_unload(apr_dso_handle_t *handle)
{
    return apr_pool_cleanup_run(handle->pool, handle, dso_cleanup);
}

APR_DECLARE(apr_status_t) apr_dso_sym(apr_dso_handle_sym_t *ressym, 
                                      apr_dso_handle_t *handle, 
                                      const char *symname)
{
    void *retval = dlsym(handle->handle, symname);

    if (retval == NULL) {
        handle->errormsg = dlerror();
        return APR_ESYMNOTFOUND;
    }

    *ressym = retval;
    return APR_SUCCESS;
}

APR_DECLARE(const char *) apr_dso_error(apr_dso_handle_t *dso, char *buffer, apr_size_t buflen)
{
    if (dso->errormsg) {
        apr_cpystrn(buffer, dso->errormsg, buflen);
        return dso->errormsg;
    }
    return "No Error";
}



/*
 * We simulate dlopen() et al. through a call to load. Because AIX has
 * no call to find an exported symbol we read the loader section of the
 * loaded module and build a list of exported symbols and their virtual
 * address.
 */

typedef struct {
    char *name;			/* the symbols's name */
    void *addr;			/* its relocated virtual address */
} Export, *ExportPtr;

/*
 * xlC uses the following structure to list its constructors and
 * destructors. This is gleaned from the output of munch.
 */
typedef struct {
    void (*init) (void);	/* call static constructors */
    void (*term) (void);	/* call static destructors */
} Cdtor, *CdtorPtr;

typedef void (*GccCDtorPtr) (void);

/*
 * The void * handle returned from dlopen is actually a ModulePtr.
 */
typedef struct Module {
    struct Module *next;
    char *name;			/* module name for refcounting */
    int refCnt;			/* the number of references */
    void *entry;		/* entry point from load */
    struct dl_info *info;	/* optional init/terminate functions */
    CdtorPtr cdtors;		/* optional C++ constructors */
    GccCDtorPtr gcc_ctor;	/* g++ constructors  --jwe */
    GccCDtorPtr gcc_dtor;	/* g++ destructors  --jwe */
    int nExports;		/* the number of exports found */
    ExportPtr exports;		/* the array of exports */
} Module, *ModulePtr;

/*
 * We keep a list of all loaded modules to be able to call the fini
 * handlers and destructors at atexit() time.
 */
static ModulePtr modList;

/*
 * The last error from one of the dl* routines is kept in static
 * variables here. Each error is returned only once to the caller.
 */
static char errbuf[BUFSIZ];
static int errvalid;

/*
 * The `fixed' gcc header files on AIX 3.2.5 provide a prototype for
 * strdup().  --jwe
 */
extern char *strdup(const char *);
static void caterr(char *);
static int readExports(ModulePtr);
static void terminate(void);
static void *findMain(void);

void *dlopen(const char *path, int mode)
{
    register ModulePtr mp;
    static void *mainModule;

    /*
     * Upon the first call register a terminate handler that will
     * close all libraries. Also get a reference to the main module
     * for use with loadbind.
     */
    if (!mainModule) {
	if ((mainModule = findMain()) == NULL)
	    return NULL;
	atexit(terminate);
    }
    /*
     * Scan the list of modules if we have the module already loaded.
     */
    for (mp = modList; mp; mp = mp->next)
	if (strcmp(mp->name, path) == 0) {
	    mp->refCnt++;
	    return mp;
	}
    if ((mp = (ModulePtr) calloc(1, sizeof(*mp))) == NULL) {
	errvalid++;
	strcpy(errbuf, "calloc: ");
	strcat(errbuf, strerror(errno));
	return NULL;
    }
    if ((mp->name = strdup(path)) == NULL) {
	errvalid++;
	strcpy(errbuf, "strdup: ");
	strcat(errbuf, strerror(errno));
	free(mp);
	return NULL;
    }
    /*
     * load should be declared load(const char *...). Thus we
     * cast the path to a normal char *. Ugly.
     */
    if ((mp->entry = (void *) loadAndInit((char *) path, L_NOAUTODEFER, NULL)) == NULL) {
	free(mp->name);
	free(mp);
	errvalid++;
	strcpy(errbuf, "dlopen: ");
	strcat(errbuf, path);
	strcat(errbuf, ": ");
	/*
	 * If AIX says the file is not executable, the error
	 * can be further described by querying the loader about
	 * the last error.
	 */
	if (errno == ENOEXEC) {
	    char *tmp[BUFSIZ / sizeof(char *)];
	    if (loadquery(L_GETMESSAGES, tmp, sizeof(tmp)) == -1)
		strcpy(errbuf, strerror(errno));
	    else {
		char **p;
		for (p = tmp; *p; p++)
		    caterr(*p);
	    }
	}
	else
	    strcat(errbuf, strerror(errno));
	return NULL;
    }
    mp->refCnt = 1;
    mp->next = modList;
    modList = mp;
    if (loadbind(0, mainModule, mp->entry) == -1) {
	dlclose(mp);
	errvalid++;
	strcpy(errbuf, "loadbind: ");
	strcat(errbuf, strerror(errno));
	return NULL;
    }
    /*
     * If the user wants global binding, loadbind against all other
     * loaded modules.
     */
    if (mode & RTLD_GLOBAL) {
	register ModulePtr mp1;
	for (mp1 = mp->next; mp1; mp1 = mp1->next)
	    if (loadbind(0, mp1->entry, mp->entry) == -1) {
		dlclose(mp);
		errvalid++;
		strcpy(errbuf, "loadbind: ");
		strcat(errbuf, strerror(errno));
		return NULL;
	    }
    }
    if (readExports(mp) == -1) {
	dlclose(mp);
	return NULL;
    }
    /*
     * If there is a dl_info structure, call the init function.
     */
    if (mp->info = (struct dl_info *) dlsym(mp, "dl_info")) {
	if (mp->info->init)
	    (*mp->info->init) ();
    }
    else
	errvalid = 0;
    /*
     * If the shared object was compiled using xlC we will need
     * to call static constructors (and later on dlclose destructors).
     */
    if (mp->cdtors = (CdtorPtr) dlsym(mp, "__cdtors")) {
	CdtorPtr cp = mp->cdtors;
	while (cp->init || cp->term) {
	    if (cp->init && cp->init != (void (*)(void)) 0xffffffff)
		(*cp->init) ();
	    cp++;
	}
	/*
	 * If the shared object was compiled using g++, we will need
	 * to call global constructors using the _GLOBAL__DI function,
	 * and later, global destructors using the _GLOBAL_DD
	 * funciton.  --jwe
	 */
    }
    else if (mp->gcc_ctor = (GccCDtorPtr) dlsym(mp, "_GLOBAL__DI")) {
	(*mp->gcc_ctor) ();
	mp->gcc_dtor = (GccCDtorPtr) dlsym(mp, "_GLOBAL__DD");
    }
    else
	errvalid = 0;
    return mp;
}

/*
 * Attempt to decipher an AIX loader error message and append it
 * to our static error message buffer.
 */
static void caterr(char *s)
{
    register char *p = s;

    while (*p >= '0' && *p <= '9')
	p++;
    switch (atoi(s)) {
    case L_ERROR_TOOMANY:
	strcat(errbuf, "to many errors");
	break;
    case L_ERROR_NOLIB:
	strcat(errbuf, "can't load library");
	strcat(errbuf, p);
	break;
    case L_ERROR_UNDEF:
	strcat(errbuf, "can't find symbol");
	strcat(errbuf, p);
	break;
    case L_ERROR_RLDBAD:
	strcat(errbuf, "bad RLD");
	strcat(errbuf, p);
	break;
    case L_ERROR_FORMAT:
	strcat(errbuf, "bad exec format in");
	strcat(errbuf, p);
	break;
    case L_ERROR_ERRNO:
	strcat(errbuf, strerror(atoi(++p)));
	break;
    default:
	strcat(errbuf, s);
	break;
    }
}

void *dlsym(void *handle, const char *symbol)
{
    register ModulePtr mp = (ModulePtr) handle;
    register ExportPtr ep;
    register int i;

    /*
     * Could speed up the search, but I assume that one assigns
     * the result to function pointers anyways.
     */
    for (ep = mp->exports, i = mp->nExports; i; i--, ep++)
	if (strcmp(ep->name, symbol) == 0)
	    return ep->addr;
    errvalid++;
    strcpy(errbuf, "dlsym: undefined symbol ");
    strcat(errbuf, symbol);
    return NULL;
}

const char *dlerror(void)
{
    if (errvalid) {
	errvalid = 0;
	return errbuf;
    }
    return NULL;
}

int dlclose(void *handle)
{
    register ModulePtr mp = (ModulePtr) handle;
    int result;
    register ModulePtr mp1;

    if (--mp->refCnt > 0)
	return 0;
    if (mp->info && mp->info->fini)
	(*mp->info->fini) ();
    if (mp->cdtors) {
	CdtorPtr cp = mp->cdtors;
	while (cp->init || cp->term) {
	    if (cp->term && cp->init != (void (*)(void)) 0xffffffff)
		(*cp->term) ();
	    cp++;
	}
	/*
	 * If the function to handle global destructors for g++
	 * exists, call it.  --jwe
	 */
    }
    else if (mp->gcc_dtor) {
	(*mp->gcc_dtor) ();
    }
    result = unload(mp->entry);
    if (result == -1) {
	errvalid++;
	strcpy(errbuf, strerror(errno));
    }
    if (mp->exports) {
	register ExportPtr ep;
	register int i;
	for (ep = mp->exports, i = mp->nExports; i; i--, ep++)
	    if (ep->name)
		free(ep->name);
	free(mp->exports);
    }
    if (mp == modList)
	modList = mp->next;
    else {
	for (mp1 = modList; mp1; mp1 = mp1->next)
	    if (mp1->next == mp) {
		mp1->next = mp->next;
		break;
	    }
    }
    free(mp->name);
    free(mp);
    return result;
}

static void terminate(void)
{
    while (modList)
	dlclose(modList);
}

/*
 * Build the export table from the XCOFF .loader section.
 */
static int readExports(ModulePtr mp)
{
    LDFILE *ldp = NULL;
    SCNHDR sh, shdata;
    LDHDR *lhp;
    char *ldbuf;
    LDSYM *ls;
    int i;
    ExportPtr ep;
    struct ld_info *lp;
    char *buf;
    int size = 4 * 1024;
    void *dataorg;

    /*
     * The module might be loaded due to the LIBPATH
     * environment variable. Search for the loaded
     * module using L_GETINFO.
     */
    if ((buf = malloc(size)) == NULL) {
	errvalid++;
	strcpy(errbuf, "readExports: ");
	strcat(errbuf, strerror(errno));
	return -1;
    }
    while ((i = loadquery(L_GETINFO, buf, size)) == -1 && errno == ENOMEM) {
	free(buf);
	size += 4 * 1024;
	if ((buf = malloc(size)) == NULL) {
	    errvalid++;
	    strcpy(errbuf, "readExports: ");
	    strcat(errbuf, strerror(errno));
	    return -1;
	}
    }
    if (i == -1) {
	errvalid++;
	strcpy(errbuf, "readExports: ");
	strcat(errbuf, strerror(errno));
	free(buf);
	return -1;
    }
    /*
     * Traverse the list of loaded modules. The entry point
     * returned by load() does actually point to the TOC
     * entry contained in the data segment.
     */
    lp = (struct ld_info *) buf;
    while (lp) {
	if ((unsigned long) mp->entry >= (unsigned long) lp->ldinfo_dataorg &&
	    (unsigned long) mp->entry < (unsigned long) lp->ldinfo_dataorg +
	    lp->ldinfo_datasize) {
	    dataorg = lp->ldinfo_dataorg;
	    ldp = ldopen(lp->ldinfo_filename, ldp);
	    break;
	}
	if (lp->ldinfo_next == 0)
	    lp = NULL;
	else
	    lp = (struct ld_info *) ((char *) lp + lp->ldinfo_next);
    }
    free(buf);
    if (!ldp) {
	errvalid++;
	strcpy(errbuf, "readExports: ");
	strcat(errbuf, strerror(errno));
	return -1;
    }
    if (TYPE(ldp) != U802TOCMAGIC) {
	errvalid++;
	strcpy(errbuf, "readExports: bad magic");
	while (ldclose(ldp) == FAILURE);
	return -1;
    }
    /*
     * Get the padding for the data section. This is needed for
     * AIX 4.1 compilers. This is used when building the final
     * function pointer to the exported symbol.
     */
    if (ldnshread(ldp, _DATA, &shdata) != SUCCESS) {
	errvalid++;
	strcpy(errbuf, "readExports: cannot read data section header");
	while (ldclose(ldp) == FAILURE);
	return -1;
    }
    if (ldnshread(ldp, _LOADER, &sh) != SUCCESS) {
	errvalid++;
	strcpy(errbuf, "readExports: cannot read loader section header");
	while (ldclose(ldp) == FAILURE);
	return -1;
    }
    /*
     * We read the complete loader section in one chunk, this makes
     * finding long symbol names residing in the string table easier.
     */
    if ((ldbuf = (char *) malloc(sh.s_size)) == NULL) {
	errvalid++;
	strcpy(errbuf, "readExports: ");
	strcat(errbuf, strerror(errno));
	while (ldclose(ldp) == FAILURE);
	return -1;
    }
    if (FSEEK(ldp, sh.s_scnptr, BEGINNING) != OKFSEEK) {
	errvalid++;
	strcpy(errbuf, "readExports: cannot seek to loader section");
	free(ldbuf);
	while (ldclose(ldp) == FAILURE);
	return -1;
    }
    if (FREAD(ldbuf, sh.s_size, 1, ldp) != 1) {
	errvalid++;
	strcpy(errbuf, "readExports: cannot read loader section");
	free(ldbuf);
	while (ldclose(ldp) == FAILURE);
	return -1;
    }
    lhp = (LDHDR *) ldbuf;
    ls = (LDSYM *) (ldbuf + LDHDRSZ);
    /*
     * Count the number of exports to include in our export table.
     */
    for (i = lhp->l_nsyms; i; i--, ls++) {
	if (!LDR_EXPORT(*ls))
	    continue;
	mp->nExports++;
    }
    if ((mp->exports = (ExportPtr) calloc(mp->nExports, sizeof(*mp->exports))) == NULL) {
	errvalid++;
	strcpy(errbuf, "readExports: ");
	strcat(errbuf, strerror(errno));
	free(ldbuf);
	while (ldclose(ldp) == FAILURE);
	return -1;
    }
    /*
     * Fill in the export table. All entries are relative to
     * the beginning of the data origin.
     */
    ep = mp->exports;
    ls = (LDSYM *) (ldbuf + LDHDRSZ);
    for (i = lhp->l_nsyms; i; i--, ls++) {
	char *symname;
	char tmpsym[SYMNMLEN + 1];
	if (!LDR_EXPORT(*ls))
	    continue;
	if (ls->l_zeroes == 0)
	    symname = ls->l_offset + lhp->l_stoff + ldbuf;
	else {
	    /*
	     * The l_name member is not zero terminated, we
	     * must copy the first SYMNMLEN chars and make
	     * sure we have a zero byte at the end.
	     */
	    strncpy(tmpsym, ls->l_name, SYMNMLEN);
	    tmpsym[SYMNMLEN] = '\0';
	    symname = tmpsym;
	}
	ep->name = strdup(symname);
	ep->addr = (void *) ((unsigned long) dataorg +
			     ls->l_value - shdata.s_vaddr);
	ep++;
    }
    free(ldbuf);
    while (ldclose(ldp) == FAILURE);
    return 0;
}

/*
 * Find the main modules data origin. This is used as export pointer
 * for loadbind() to be able to resolve references to the main part.
 */
static void *findMain(void)
{
    struct ld_info *lp;
    char *buf;
    int size = 4 * 1024;
    int i;
    void *ret;

    if ((buf = malloc(size)) == NULL) {
	errvalid++;
	strcpy(errbuf, "findMain: ");
	strcat(errbuf, strerror(errno));
	return NULL;
    }
    while ((i = loadquery(L_GETINFO, buf, size)) == -1 && errno == ENOMEM) {
	free(buf);
	size += 4 * 1024;
	if ((buf = malloc(size)) == NULL) {
	    errvalid++;
	    strcpy(errbuf, "findMain: ");
	    strcat(errbuf, strerror(errno));
	    return NULL;
	}
    }
    if (i == -1) {
	errvalid++;
	strcpy(errbuf, "findMain: ");
	strcat(errbuf, strerror(errno));
	free(buf);
	return NULL;
    }
    /*
     * The first entry is the main module. The data segment
     * starts with the TOC entries for all exports, so the
     * data segment origin works as argument for loadbind.
     */
    lp = (struct ld_info *) buf;
    ret = lp->ldinfo_dataorg;
    free(buf);
    return ret;
}

#endif