1 /* dl_aix.xs
2 *
3 * Written: 8/31/94 by Wayne Scott (wscott@ichips.intel.com)
4 *
5 * All I did was take Jens-Uwe Mager's libdl emulation library for
6 * AIX and merged it with the dl_dlopen.xs file to create a dynamic library
7 * package that works for AIX.
8 *
9 * I did change all malloc's, free's, strdup's, calloc's to use the perl
10 * equilvant. I also removed some stuff we will not need. Call fini()
11 * on startup... It can probably be trimmed more.
12 */
13
14 #define PERLIO_NOT_STDIO 0
15 #define PERL_EXT
16 #define PERL_IN_DL_AIX_XS
17
18 /*
19 * On AIX 4.3 and above the emulation layer is not needed any more, and
20 * indeed if perl uses its emulation and perl is linked into apache
21 * which is supposed to use the native dlopen conflicts arise.
22 * Jens-Uwe Mager jum@helios.de
23 */
24 #ifdef USE_NATIVE_DLOPEN
25
26 #include "EXTERN.h"
27 #include "perl.h"
28 #include "XSUB.h"
29 #include <dlfcn.h>
30
31 #include "dlutils.c" /* SaveError() etc */
32
33 #else
34
35 /*
36 * @(#)dlfcn.c 1.5 revision of 93/02/14 20:14:17
37 * This is an unpublished work copyright (c) 1992 Helios Software GmbH
38 * 3000 Hannover 1, Germany
39 */
40 #include "EXTERN.h"
41 #include "perl.h"
42 #include "XSUB.h"
43
44 /* When building as a 64-bit binary on AIX, define this to get the
45 * correct structure definitions. Also determines the field-name
46 * macros and gates some logic in readEntries(). -- Steven N. Hirsch
47 * <hirschs@btv.ibm.com> */
48 #ifdef USE_64_BIT_ALL
49 # define __XCOFF64__
50 # define __XCOFF32__
51 #endif
52
53 #include <stdio.h>
54 #include <errno.h>
55 #include <string.h>
56 #include <stdlib.h>
57 #include <sys/types.h>
58 #include <sys/ldr.h>
59 #include <a.out.h>
60 #undef FREAD
61 #undef FWRITE
62 #include <ldfcn.h>
63
64 #ifdef USE_64_BIT_ALL
65 # define AIX_SCNHDR SCNHDR_64
66 # define AIX_LDHDR LDHDR_64
67 # define AIX_LDSYM LDSYM_64
68 # define AIX_LDHDRSZ LDHDRSZ_64
69 #else
70 # define AIX_SCNHDR SCNHDR
71 # define AIX_LDHDR LDHDR
72 # define AIX_LDSYM LDSYM
73 # define AIX_LDHDRSZ LDHDRSZ
74 #endif
75
76 /* When using Perl extensions written in C++ the longer versions
77 * of load() and unload() from libC and libC_r need to be used,
78 * otherwise statics in the extensions won't get initialized right.
79 * -- Stephanie Beals <bealzy@us.ibm.com> */
80
81 /* Older AIX C compilers cannot deal with C++ double-slash comments in
82 the ibmcxx and/or xlC includes. Since we only need a single file,
83 be more fine-grained about what's included <hirschs@btv.ibm.com> */
84
85 #ifdef USE_libC /* The define comes, when it comes, from hints/aix.pl. */
86 # define LOAD loadAndInit
87 # define UNLOAD terminateAndUnload
88 # if defined(USE_vacpp_load_h)
89 # include "/usr/vacpp/include/load.h"
90 # elif defined(USE_ibmcxx_load_h)
91 # include "/usr/ibmcxx/include/load.h"
92 # elif defined(USE_xlC_load_h)
93 # include "/usr/lpp/xlC/include/load.h"
94 # elif defined(USE_load_h)
95 # include "/usr/include/load.h"
96 # endif
97 #else
98 # define LOAD load
99 # define UNLOAD unload
100 #endif
101
102 /*
103 * AIX 4.3 does remove some useful definitions from ldfcn.h. Define
104 * these here to compensate for that lossage.
105 */
106 #ifndef BEGINNING
107 # define BEGINNING SEEK_SET
108 #endif
109 #ifndef FSEEK
110 # define FSEEK(ldptr,o,p) fseek(IOPTR(ldptr),(p==BEGINNING)?(OFFSET(ldptr) +o):o,p)
111 #endif
112 #ifndef FREAD
113 # define FREAD(p,s,n,ldptr) fread(p,s,n,IOPTR(ldptr))
114 #endif
115
116 #ifndef RTLD_LAZY
117 # define RTLD_LAZY 0
118 #endif
119 #ifndef RTLD_GLOBAL
120 # define RTLD_GLOBAL 0
121 #endif
122
123 /*
124 * We simulate dlopen() et al. through a call to load. Because AIX has
125 * no call to find an exported symbol we read the loader section of the
126 * loaded module and build a list of exported symbols and their virtual
127 * address.
128 */
129
130 typedef struct {
131 char *name; /* the symbols's name */
132 void *addr; /* its relocated virtual address */
133 } Export, *ExportPtr;
134
135 /*
136 * The void * handle returned from dlopen is actually a ModulePtr.
137 */
138 typedef struct Module {
139 struct Module *next;
140 char *name; /* module name for refcounting */
141 int refCnt; /* the number of references */
142 void *entry; /* entry point from load */
143 int nExports; /* the number of exports found */
144 ExportPtr exports; /* the array of exports */
145 } Module, *ModulePtr;
146
147 typedef struct {
148 /*
149 * We keep a list of all loaded modules to be able to reference count
150 * duplicate dlopen's.
151 */
152 ModulePtr x_modList;
153
154 /*
155 * The last error from one of the dl* routines is kept in static
156 * variables here. Each error is returned only once to the caller.
157 */
158 char x_errbuf[BUFSIZ];
159 int x_errvalid;
160 void * x_mainModule;
161 } my_cxtx_t; /* this *must* be named my_cxtx_t */
162
163 #define DL_CXT_EXTRA /* ask for dl_cxtx to be defined in dlutils.c */
164 #include "dlutils.c" /* SaveError() etc */
165
166 #define dl_modList (dl_cxtx.x_modList)
167 #define dl_errbuf (dl_cxtx.x_errbuf)
168 #define dl_errvalid (dl_cxtx.x_errvalid)
169 #define dl_mainModule (dl_cxtx.x_mainModule)
170
171 static void caterr(char *);
172 static int readExports(ModulePtr);
173 static void *findMain(void);
174
175 /* these statics are ok because they're constants */
176 static char *strerror_failed = "(strerror failed)";
177 static char *strerror_r_failed = "(strerror_r failed)";
178
strerrorcat(char * str,int err)179 char *strerrorcat(char *str, int err) {
180 int strsiz = strlen(str);
181 int msgsiz;
182 char *msg;
183
184 dTHX;
185
186 if ((msg = strerror(err)) == 0)
187 msg = strerror_failed;
188 msgsiz = strlen(msg); /* Note msg = buf and free() above. */
189 if (strsiz + msgsiz < BUFSIZ) /* Do not move this after #endif. */
190 strcat(str, msg);
191
192 return str;
193 }
194
strerrorcpy(char * str,int err)195 char *strerrorcpy(char *str, int err) {
196 int msgsiz;
197 char *msg;
198
199 dTHX;
200
201 if ((msg = strerror(err)) == 0)
202 msg = strerror_failed;
203 msgsiz = strlen(msg); /* Note msg = buf and free() above. */
204 if (msgsiz < BUFSIZ) /* Do not move this after #endif. */
205 strcpy(str, msg);
206
207 return str;
208 }
209
210 /* ARGSUSED */
dlopen(char * path,int mode)211 void *dlopen(char *path, int mode)
212 {
213 dTHX;
214 dMY_CXT;
215 ModulePtr mp;
216
217 /*
218 * Upon the first call register a terminate handler that will
219 * close all libraries.
220 */
221 if (dl_mainModule == NULL) {
222 if ((dl_mainModule = findMain()) == NULL)
223 return NULL;
224 }
225 /*
226 * Scan the list of modules if have the module already loaded.
227 */
228 for (mp = dl_modList; mp; mp = mp->next)
229 if (strEQ(mp->name, path)) {
230 mp->refCnt++;
231 return mp;
232 }
233 Newxz(mp,1,Module);
234 if (mp == NULL) {
235 dl_errvalid++;
236 strcpy(dl_errbuf, "Newz: ");
237 strerrorcat(dl_errbuf, errno);
238 return NULL;
239 }
240
241 if ((mp->name = savepv(path)) == NULL) {
242 dl_errvalid++;
243 strcpy(dl_errbuf, "savepv: ");
244 strerrorcat(dl_errbuf, errno);
245 safefree(mp);
246 return NULL;
247 }
248
249 /*
250 * load should be declared load(const char *...). Thus we
251 * cast the path to a normal char *. Ugly.
252 */
253 if ((mp->entry = (void *)LOAD((char *)path,
254 #ifdef L_LIBPATH_EXEC
255 L_LIBPATH_EXEC |
256 #endif
257 L_NOAUTODEFER,
258 NULL)) == NULL) {
259 int saverrno = errno;
260
261 safefree(mp->name);
262 safefree(mp);
263 dl_errvalid++;
264 strcpy(dl_errbuf, "dlopen: ");
265 strcat(dl_errbuf, path);
266 strcat(dl_errbuf, ": ");
267 /*
268 * If AIX says the file is not executable, the error
269 * can be further described by querying the loader about
270 * the last error.
271 */
272 if (saverrno == ENOEXEC) {
273 char *moreinfo[BUFSIZ/sizeof(char *)];
274 if (loadquery(L_GETMESSAGES, moreinfo, sizeof(moreinfo)) == -1)
275 strerrorcpy(dl_errbuf, saverrno);
276 else {
277 char **p;
278 for (p = moreinfo; *p; p++)
279 caterr(*p);
280 }
281 } else
282 strerrorcat(dl_errbuf, saverrno);
283 return NULL;
284 }
285 mp->refCnt = 1;
286 mp->next = dl_modList;
287 dl_modList = mp;
288 /*
289 * Assume anonymous exports come from the module this dlopen
290 * is linked into, that holds true as long as dlopen and all
291 * of the perl core are in the same shared object. Also bind
292 * against the main part, in the case a perl is not the main
293 * part, e.g mod_perl as DSO in Apache so perl modules can
294 * also reference Apache symbols.
295 */
296 if (loadbind(0, (void *)dlopen, mp->entry) == -1 ||
297 loadbind(0, dl_mainModule, mp->entry)) {
298 int saverrno = errno;
299
300 dlclose(mp);
301 dl_errvalid++;
302 strcpy(dl_errbuf, "loadbind: ");
303 strerrorcat(dl_errbuf, saverrno);
304 return NULL;
305 }
306 if (readExports(mp) == -1) {
307 dlclose(mp);
308 return NULL;
309 }
310 return mp;
311 }
312
313 /*
314 * Attempt to decipher an AIX loader error message and append it
315 * to our static error message buffer.
316 */
caterr(char * s)317 static void caterr(char *s)
318 {
319 dTHX;
320 dMY_CXT;
321 char *p = s;
322
323 while (isDIGIT(*p))
324 p++;
325 switch(atoi(s)) {
326 case L_ERROR_TOOMANY:
327 strcat(dl_errbuf, "too many errors");
328 break;
329 case L_ERROR_NOLIB:
330 strcat(dl_errbuf, "can't load library");
331 strcat(dl_errbuf, p);
332 break;
333 case L_ERROR_UNDEF:
334 strcat(dl_errbuf, "can't find symbol");
335 strcat(dl_errbuf, p);
336 break;
337 case L_ERROR_RLDBAD:
338 strcat(dl_errbuf, "bad RLD");
339 strcat(dl_errbuf, p);
340 break;
341 case L_ERROR_FORMAT:
342 strcat(dl_errbuf, "bad exec format in");
343 strcat(dl_errbuf, p);
344 break;
345 case L_ERROR_ERRNO:
346 strerrorcat(dl_errbuf, atoi(++p));
347 break;
348 default:
349 strcat(dl_errbuf, s);
350 break;
351 }
352 }
353
dlsym(void * handle,const char * symbol)354 void *dlsym(void *handle, const char *symbol)
355 {
356 dTHX;
357 dMY_CXT;
358 ModulePtr mp = (ModulePtr)handle;
359 ExportPtr ep;
360 int i;
361
362 /*
363 * Could speed up search, but I assume that one assigns
364 * the result to function pointers anyways.
365 */
366 for (ep = mp->exports, i = mp->nExports; i; i--, ep++)
367 if (strEQ(ep->name, symbol))
368 return ep->addr;
369 dl_errvalid++;
370 strcpy(dl_errbuf, "dlsym: undefined symbol ");
371 strcat(dl_errbuf, symbol);
372 return NULL;
373 }
374
dlerror(void)375 char *dlerror(void)
376 {
377 dTHX;
378 dMY_CXT;
379 if (dl_errvalid) {
380 dl_errvalid = 0;
381 return dl_errbuf;
382 }
383 return NULL;
384 }
385
dlclose(void * handle)386 int dlclose(void *handle)
387 {
388 dTHX;
389 dMY_CXT;
390 ModulePtr mp = (ModulePtr)handle;
391 int result;
392 ModulePtr mp1;
393
394 if (--mp->refCnt > 0)
395 return 0;
396 result = UNLOAD(mp->entry);
397 if (result == -1) {
398 dl_errvalid++;
399 strerrorcpy(dl_errbuf, errno);
400 }
401 if (mp->exports) {
402 ExportPtr ep;
403 int i;
404 for (ep = mp->exports, i = mp->nExports; i; i--, ep++)
405 if (ep->name)
406 safefree(ep->name);
407 safefree(mp->exports);
408 }
409 if (mp == dl_modList)
410 dl_modList = mp->next;
411 else {
412 for (mp1 = dl_modList; mp1; mp1 = mp1->next)
413 if (mp1->next == mp) {
414 mp1->next = mp->next;
415 break;
416 }
417 }
418 safefree(mp->name);
419 safefree(mp);
420 return result;
421 }
422
423 /* Added by Wayne Scott
424 * This is needed because the ldopen system call calls
425 * calloc to allocated a block of date. The ldclose call calls free.
426 * Without this we get this system calloc and perl's free, resulting
427 * in a "Bad free" message. This way we always use perl's malloc.
428 */
calloc(size_t ne,size_t sz)429 void *calloc(size_t ne, size_t sz)
430 {
431 void *out;
432
433 out = (void *) safemalloc(ne*sz);
434 memzero(out, ne*sz);
435 return(out);
436 }
437
438 /*
439 * Build the export table from the XCOFF .loader section.
440 */
readExports(ModulePtr mp)441 static int readExports(ModulePtr mp)
442 {
443 dTHX;
444 dMY_CXT;
445 LDFILE *ldp = NULL;
446 AIX_SCNHDR sh;
447 AIX_LDHDR *lhp;
448 char *ldbuf;
449 AIX_LDSYM *ls;
450 int i;
451 ExportPtr ep;
452
453 if ((ldp = ldopen(mp->name, ldp)) == NULL) {
454 struct ld_info *lp;
455 char *buf;
456 int size = 4*1024;
457 if (errno != ENOENT) {
458 dl_errvalid++;
459 strcpy(dl_errbuf, "readExports: ");
460 strerrorcat(dl_errbuf, errno);
461 return -1;
462 }
463 /*
464 * The module might be loaded due to the LIBPATH
465 * environment variable. Search for the loaded
466 * module using L_GETINFO.
467 */
468 if ((buf = safemalloc(size)) == NULL) {
469 dl_errvalid++;
470 strcpy(dl_errbuf, "readExports: ");
471 strerrorcat(dl_errbuf, errno);
472 return -1;
473 }
474 while ((i = loadquery(L_GETINFO, buf, size)) == -1 && errno == ENOMEM) {
475 safefree(buf);
476 size += 4*1024;
477 if ((buf = safemalloc(size)) == NULL) {
478 dl_errvalid++;
479 strcpy(dl_errbuf, "readExports: ");
480 strerrorcat(dl_errbuf, errno);
481 return -1;
482 }
483 }
484 if (i == -1) {
485 dl_errvalid++;
486 strcpy(dl_errbuf, "readExports: ");
487 strerrorcat(dl_errbuf, errno);
488 safefree(buf);
489 return -1;
490 }
491 /*
492 * Traverse the list of loaded modules. The entry point
493 * returned by LOAD() does actually point to the data
494 * segment origin.
495 */
496 lp = (struct ld_info *)buf;
497 while (lp) {
498 if (lp->ldinfo_dataorg == mp->entry) {
499 ldp = ldopen(lp->ldinfo_filename, ldp);
500 break;
501 }
502 if (lp->ldinfo_next == 0)
503 lp = NULL;
504 else
505 lp = (struct ld_info *)((char *)lp + lp->ldinfo_next);
506 }
507 safefree(buf);
508 if (!ldp) {
509 dl_errvalid++;
510 strcpy(dl_errbuf, "readExports: ");
511 strerrorcat(dl_errbuf, errno);
512 return -1;
513 }
514 }
515 #ifdef USE_64_BIT_ALL
516 if (TYPE(ldp) != U803XTOCMAGIC) {
517 #else
518 if (TYPE(ldp) != U802TOCMAGIC) {
519 #endif
520 dl_errvalid++;
521 strcpy(dl_errbuf, "readExports: bad magic");
522 while(ldclose(ldp) == FAILURE)
523 ;
524 return -1;
525 }
526 if (ldnshread(ldp, _LOADER, &sh) != SUCCESS) {
527 dl_errvalid++;
528 strcpy(dl_errbuf, "readExports: cannot read loader section header");
529 while(ldclose(ldp) == FAILURE)
530 ;
531 return -1;
532 }
533 /*
534 * We read the complete loader section in one chunk, this makes
535 * finding long symbol names residing in the string table easier.
536 */
537 if ((ldbuf = (char *)safemalloc(sh.s_size)) == NULL) {
538 dl_errvalid++;
539 strcpy(dl_errbuf, "readExports: ");
540 strerrorcat(dl_errbuf, errno);
541 while(ldclose(ldp) == FAILURE)
542 ;
543 return -1;
544 }
545 if (FSEEK(ldp, sh.s_scnptr, BEGINNING) != OKFSEEK) {
546 dl_errvalid++;
547 strcpy(dl_errbuf, "readExports: cannot seek to loader section");
548 safefree(ldbuf);
549 while(ldclose(ldp) == FAILURE)
550 ;
551 return -1;
552 }
553 /* This first case is a hack, since it assumes that the 3rd parameter to
554 FREAD is 1. See the redefinition of FREAD above to see how this works. */
555 if (FREAD(ldbuf, sh.s_size, 1, ldp) != 1) {
556 dl_errvalid++;
557 strcpy(dl_errbuf, "readExports: cannot read loader section");
558 safefree(ldbuf);
559 while(ldclose(ldp) == FAILURE)
560 ;
561 return -1;
562 }
563 lhp = (AIX_LDHDR *)ldbuf;
564 ls = (AIX_LDSYM *)(ldbuf+AIX_LDHDRSZ);
565 /*
566 * Count the number of exports to include in our export table.
567 */
568 for (i = lhp->l_nsyms; i; i--, ls++) {
569 if (!LDR_EXPORT(*ls))
570 continue;
571 mp->nExports++;
572 }
573 Newxz(mp->exports, mp->nExports, Export);
574 if (mp->exports == NULL) {
575 dl_errvalid++;
576 strcpy(dl_errbuf, "readExports: ");
577 strerrorcat(dl_errbuf, errno);
578 safefree(ldbuf);
579 while(ldclose(ldp) == FAILURE)
580 ;
581 return -1;
582 }
583 /*
584 * Fill in the export table. All entries are relative to
585 * the entry point we got from load.
586 */
587 ep = mp->exports;
588 ls = (AIX_LDSYM *)(ldbuf+AIX_LDHDRSZ);
589 for (i = lhp->l_nsyms; i; i--, ls++) {
590 char *symname;
591 if (!LDR_EXPORT(*ls))
592 continue;
593 #ifndef USE_64_BIT_ALL
594 if (ls->l_zeroes == 0)
595 #endif
596 symname = ls->l_offset+lhp->l_stoff+ldbuf;
597 #ifndef USE_64_BIT_ALL
598 else
599 symname = ls->l_name;
600 #endif
601 ep->name = savepv(symname);
602 ep->addr = (void *)((unsigned long)mp->entry + ls->l_value);
603 ep++;
604 }
605 safefree(ldbuf);
606 while(ldclose(ldp) == FAILURE)
607 ;
608 return 0;
609 }
610
611 /*
612 * Find the main modules entry point. This is used as export pointer
613 * for loadbind() to be able to resolve references to the main part.
614 */
615 static void * findMain(void)
616 {
617 dTHX;
618 dMY_CXT;
619 struct ld_info *lp;
620 char *buf;
621 int size = 4*1024;
622 int i;
623 void *ret;
624
625 if ((buf = safemalloc(size)) == NULL) {
626 dl_errvalid++;
627 strcpy(dl_errbuf, "findMain: ");
628 strerrorcat(dl_errbuf, errno);
629 return NULL;
630 }
631 while ((i = loadquery(L_GETINFO, buf, size)) == -1 && errno == ENOMEM) {
632 safefree(buf);
633 size += 4*1024;
634 if ((buf = safemalloc(size)) == NULL) {
635 dl_errvalid++;
636 strcpy(dl_errbuf, "findMain: ");
637 strerrorcat(dl_errbuf, errno);
638 return NULL;
639 }
640 }
641 if (i == -1) {
642 dl_errvalid++;
643 strcpy(dl_errbuf, "findMain: ");
644 strerrorcat(dl_errbuf, errno);
645 safefree(buf);
646 return NULL;
647 }
648 /*
649 * The first entry is the main module. The entry point
650 * returned by load() does actually point to the data
651 * segment origin.
652 */
653 lp = (struct ld_info *)buf;
654 ret = lp->ldinfo_dataorg;
655 safefree(buf);
656 return ret;
657 }
658 #endif /* USE_NATIVE_DLOPEN */
659
660 /* dl_dlopen.xs
661 *
662 * Platform: SunOS/Solaris, possibly others which use dlopen.
663 * Author: Paul Marquess (Paul.Marquess@btinternet.com)
664 * Created: 10th July 1994
665 *
666 * Modified:
667 * 15th July 1994 - Added code to explicitly save any error messages.
668 * 3rd August 1994 - Upgraded to v3 spec.
669 * 9th August 1994 - Changed to use IV
670 * 10th August 1994 - Tim Bunce: Added RTLD_LAZY, switchable debugging,
671 * basic FreeBSD support, removed ClearError
672 *
673 */
674
675 /* Porting notes:
676
677 see dl_dlopen.xs
678
679 */
680
681 static void
682 dl_private_init(pTHX)
683 {
684 (void)dl_generic_private_init(aTHX);
685 }
686
687 MODULE = DynaLoader PACKAGE = DynaLoader
688
689 BOOT:
690 (void)dl_private_init(aTHX);
691
692
693 void
694 dl_load_file(filename, flags=0)
695 char * filename
696 int flags
697 PREINIT:
698 void *retv;
699 PPCODE:
700 DLDEBUG(1,PerlIO_printf(Perl_debug_log, "dl_load_file(%s,%x):\n", filename,flags));
701 if (flags & 0x01)
702 Perl_warn(aTHX_ "Can't make loaded symbols global on this platform while loading %s",filename);
703 retv = dlopen(filename, RTLD_GLOBAL|RTLD_LAZY) ;
704 DLDEBUG(2,PerlIO_printf(Perl_debug_log, " libref=%x\n", retv));
705 ST(0) = newSV_type_mortal(SVt_IV);
706 if (retv == NULL)
707 SaveError(aTHX_ "%s",dlerror()) ;
708 else
709 sv_setiv( ST(0), PTR2IV(retv) );
710 XSRETURN(1);
711
712 int
713 dl_unload_file(libref)
714 void * libref
715 CODE:
716 DLDEBUG(1,PerlIO_printf(Perl_debug_log, "dl_unload_file(%lx):\n", libref));
717 RETVAL = (dlclose(libref) == 0 ? 1 : 0);
718 if (!RETVAL)
719 SaveError(aTHX_ "%s", dlerror()) ;
720 DLDEBUG(2,PerlIO_printf(Perl_debug_log, " retval = %d\n", RETVAL));
721 OUTPUT:
722 RETVAL
723
724 void
725 dl_find_symbol(libhandle, symbolname, ign_err=0)
726 void * libhandle
727 char * symbolname
728 int ign_err
729 PREINIT:
730 void *retv;
731 CODE:
732 DLDEBUG(2,PerlIO_printf(Perl_debug_log, "dl_find_symbol(handle=%x, symbol=%s)\n",
733 libhandle, symbolname));
734 retv = dlsym(libhandle, symbolname);
735 DLDEBUG(2,PerlIO_printf(Perl_debug_log, " symbolref = %x\n", retv));
736 ST(0) = newSV_type_mortal(SVt_IV);
737 if (retv == NULL) {
738 if (!ign_err)
739 SaveError(aTHX_ "%s", dlerror());
740 } else
741 sv_setiv( ST(0), PTR2IV(retv));
742
743
744 void
745 dl_undef_symbols()
746 CODE:
747
748
749
750 # These functions should not need changing on any platform:
751
752 void
753 dl_install_xsub(perl_name, symref, filename="$Package")
754 char * perl_name
755 void * symref
756 const char * filename
757 CODE:
758 DLDEBUG(2,PerlIO_printf(Perl_debug_log, "dl_install_xsub(name=%s, symref=%x)\n",
759 perl_name, symref));
760 ST(0) = sv_2mortal(newRV((SV*)newXS_flags(perl_name,
761 (void(*)(pTHX_ CV *))symref,
762 filename, NULL,
763 XS_DYNAMIC_FILENAME)));
764
765
766 SV *
767 dl_error()
768 CODE:
769 dMY_CXT;
770 RETVAL = newSVsv(MY_CXT.x_dl_last_error);
771 OUTPUT:
772 RETVAL
773
774 #if defined(USE_ITHREADS)
775
776 void
777 CLONE(...)
778 CODE:
779 MY_CXT_CLONE;
780
781 PERL_UNUSED_VAR(items);
782
783 /* MY_CXT_CLONE just does a memcpy on the whole structure, so to avoid
784 * using Perl variables that belong to another thread, we create our
785 * own for this thread.
786 */
787 MY_CXT.x_dl_last_error = newSVpvs("");
788
789 #endif
790
791 # end.
792