summaryrefslogtreecommitdiffstats
path: root/Python/importdl.c
blob: 00a033e92c51ee5b3e520f5608f8aa49d56484ee (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
/***********************************************************
Copyright 1991-1995 by Stichting Mathematisch Centrum, Amsterdam,
The Netherlands.

                        All Rights Reserved

Permission to use, copy, modify, and distribute this software and its 
documentation for any purpose and without fee is hereby granted, 
provided that the above copyright notice appear in all copies and that
both that copyright notice and this permission notice appear in 
supporting documentation, and that the names of Stichting Mathematisch
Centrum or CWI not be used in advertising or publicity pertaining to
distribution of the software without specific, written prior permission.

STICHTING MATHEMATISCH CENTRUM DISCLAIMS ALL WARRANTIES WITH REGARD TO
THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
FITNESS, IN NO EVENT SHALL STICHTING MATHEMATISCH CENTRUM BE LIABLE
FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

******************************************************************/

/* Support for dynamic loading of extension modules */
/* If no dynamic linking is supported, this file still generates some code! */

#include "allobjects.h"
#include "osdefs.h"
#include "importdl.h"

extern int verbose; /* Defined in pythonrun.c */

/* Explanation of some of the the various #defines used by dynamic linking...

   symbol	-- defined for:

   DYNAMIC_LINK -- any kind of dynamic linking
   USE_RLD	-- NeXT dynamic linking (currently disabled)
   USE_DL	-- Jack's dl for IRIX 4 or GNU dld with emulation for Jack's dl
   USE_SHLIB	-- SunOS or IRIX 5 (SVR4?) shared libraries
   _AIX		-- AIX style dynamic linking
   NT		-- NT style dynamic linking (using DLLs)
   _DL_FUNCPTR_DEFINED	-- if the typedef dl_funcptr has been defined
   WITH_MAC_DL	-- Mac dynamic linking (highly experimental)
   SHORT_EXT	-- short extension for dynamic module, e.g. ".so"
   LONG_EXT	-- long extension, e.g. "module.so"
   hpux		-- HP-UX Dynamic Linking - defined by the compiler
   __NetBSD__	-- NetBSD shared libraries (not quite SVR4 compatible)

   (The other WITH_* symbols are used only once, to set the
   appropriate symbols.)
*/

/* Configure dynamic linking */

#ifdef hpux
#define DYNAMIC_LINK
#include <errno.h>
typedef void (*dl_funcptr)();
#define _DL_FUNCPTR_DEFINED 1
#define SHORT_EXT ".sl"
#define LONG_EXT "module.sl"
#endif 

#ifdef __NetBSD__
#define DYNAMIC_LINK
#define USE_SHLIB

#define dlerror() "error in dynamic linking"
#endif

#ifdef NT
#define DYNAMIC_LINK
#include <windows.h>
typedef FARPROC dl_funcptr;
#define _DL_FUNCPTR_DEFINED
#define SHORT_EXT ".pyd"
#define LONG_EXT "module.pyd"
#endif

#ifdef WITH_RLD
#define DYNAMIC_LINK
#define USE_RLD
#endif

#ifdef WITH_SGI_DL
#define DYNAMIC_LINK
#define USE_DL
#endif

#ifdef WITH_DL_DLD
#define DYNAMIC_LINK
#define USE_DL
#endif

#ifdef WITH_MAC_DL
#define DYNAMIC_LINK
#endif

#if !defined(DYNAMIC_LINK) && defined(HAVE_DLFCN_H) && defined(HAVE_DLOPEN)
#define DYNAMIC_LINK
#define USE_SHLIB
#endif

#ifdef _AIX
#define DYNAMIC_LINK
#include <sys/ldr.h>
typedef void (*dl_funcptr)();
#define _DL_FUNCPTR_DEFINED
static void aix_loaderror(char *name);
#endif

#ifdef DYNAMIC_LINK

#ifdef USE_SHLIB
#ifdef __NetBSD__
#include <nlist.h>
#include <link.h>
#else
#include <dlfcn.h>
#endif
#ifndef _DL_FUNCPTR_DEFINED
typedef void (*dl_funcptr)();
#endif
#ifndef RTLD_LAZY
#define RTLD_LAZY 1
#endif
#define SHORT_EXT ".so"
#define LONG_EXT "module.so"
#endif /* USE_SHLIB */

#if defined(USE_DL) || defined(hpux)
#include "dl.h"
#endif

#ifdef WITH_MAC_DL
#include "dynamic_load.h"
#endif

#ifdef USE_RLD
#include <mach-o/rld.h>
#define FUNCNAME_PATTERN "_init%.200s"
#ifndef _DL_FUNCPTR_DEFINED
typedef void (*dl_funcptr)();
#endif
#endif /* USE_RLD */

extern char *getprogramname();

#ifndef FUNCNAME_PATTERN
#if defined(__hp9000s300) || defined(__NetBSD__)
#define FUNCNAME_PATTERN "_init%.200s"
#else
#define FUNCNAME_PATTERN "init%.200s"
#endif
#endif

#if !defined(SHORT_EXT) && !defined(LONG_EXT)
#define SHORT_EXT ".o"
#define LONG_EXT "module.o"
#endif /* !SHORT_EXT && !LONG_EXT */

#endif /* DYNAMIC_LINK */

/* Max length of module suffix searched for -- accommodates "module.so" */
#ifndef MAXSUFFIXSIZE
#define MAXSUFFIXSIZE 10
#endif

/* Pass it on to import.c */
int import_maxsuffixsize = MAXSUFFIXSIZE;

struct filedescr import_filetab[] = {
#ifdef SHORT_EXT
	{SHORT_EXT, "rb", C_EXTENSION},
#endif /* !SHORT_EXT */
#ifdef LONG_EXT
	{LONG_EXT, "rb", C_EXTENSION},
#endif /* !LONG_EXT */
	{".py", "r", PY_SOURCE},
	{".pyc", "rb", PY_COMPILED},
	{0, 0}
};

object *
load_dynamic_module(name, pathname)
	char *name;
	char *pathname;
{
#ifndef DYNAMIC_LINK
	err_setstr(ImportError, "dynamically linked modules not supported");
	return NULL;
#else
	object *m;
	char funcname[258];
	dl_funcptr p = NULL;
	sprintf(funcname, FUNCNAME_PATTERN, name);
#ifdef WITH_MAC_DL
	{
		object *v = dynamic_load(pathname);
		if (v == NULL)
			return NULL;
	}
#else /* !WITH_MAC_DL */
#ifdef USE_SHLIB
	{
#ifdef RTLD_NOW
		/* RTLD_NOW: resolve externals now
		   (i.e. core dump now if some are missing) */
		void *handle = dlopen(pathname, RTLD_NOW);
#else
		void *handle;
		if (verbose)
			printf("dlopen(\"%s\", %d);\n", pathname, RTLD_LAZY);
		handle = dlopen(pathname, RTLD_LAZY);
#endif /* RTLD_NOW */
		if (handle == NULL) {
			err_setstr(ImportError, dlerror());
			return NULL;
		}
		p = (dl_funcptr) dlsym(handle, funcname);
	}
#endif /* USE_SHLIB */
#ifdef _AIX
	p = (dl_funcptr) load(pathname, 1, 0);
	if (p == NULL) {
		aix_loaderror(pathname);
		return NULL;
	}
#endif /* _AIX */
#ifdef NT
	{
		HINSTANCE hDLL;
		hDLL = LoadLibrary(pathname);
		if (hDLL==NULL){
			char errBuf[64];
			sprintf(errBuf, "DLL load failed with error code %d",
				GetLastError());
			err_setstr(ImportError, errBuf);
		return NULL;
		}
		p = GetProcAddress(hDLL, funcname);
	}
#endif /* NT */
#ifdef USE_DL
	p =  dl_loadmod(getprogramname(), pathname, funcname);
#endif /* USE_DL */
#ifdef USE_RLD
	{
		NXStream *errorStream;
		struct mach_header *new_header;
		const char *filenames[2];
		long ret;
		unsigned long ptr;

		errorStream = NXOpenMemory(NULL, 0, NX_WRITEONLY);
		filenames[0] = pathname;
		filenames[1] = NULL;
		ret = rld_load(errorStream, &new_header, 
				filenames, NULL);

		/* extract the error messages for the exception */
		if(!ret) {
			char *streamBuf;
			int len, maxLen;

			NXPutc(errorStream, (char)0);

			NXGetMemoryBuffer(errorStream,
				&streamBuf, &len, &maxLen);
			err_setstr(ImportError, streamBuf);
		}

		if(ret && rld_lookup(errorStream, funcname, &ptr))
			p = (dl_funcptr) ptr;

		NXCloseMemory(errorStream, NX_FREEBUFFER);

		if(!ret)
			return NULL;
	}
#endif /* USE_RLD */
#ifdef hpux
	{
		shl_t lib;
		int flags;

		flags = BIND_DEFERRED;
		if (verbose)
                {
                        flags = BIND_IMMEDIATE | BIND_NONFATAL | BIND_VERBOSE;
                        printf("shl_load %s\n",pathname);
                }
                lib = shl_load(pathname, flags, 0);
                if (lib == NULL)
                {
                        char buf[256];
                        if (verbose)
                                perror(pathname);
                        sprintf(buf, "Failed to load %.200s", pathname);
                        err_setstr(ImportError, buf);
                        return NULL;
                }
                if (verbose)
                        printf("shl_findsym %s\n", funcname);
                shl_findsym(&lib, funcname, TYPE_UNDEFINED, (void *) &p);
                if (p == NULL && verbose)
                        perror(funcname);
	}
#endif /* hpux */
	if (p == NULL) {
		err_setstr(ImportError,
		   "dynamic module does not define init function");
		return NULL;
	}
	(*p)();

#endif /* !WITH_MAC_DL */
	m = dictlookup(import_modules, name);
	if (m == NULL) {
		if (err_occurred() == NULL)
			err_setstr(SystemError,
				   "dynamic module not initialized properly");
		return NULL;
	}
	if (verbose)
		fprintf(stderr,
			"import %s # dynamically loaded from %s\n",
			name, pathname);
	INCREF(m);
	return m;
#endif /* DYNAMIC_LINK */
}


#ifdef _AIX

#include <ctype.h>	/* for isdigit()	*/
#include <errno.h>	/* for global errno	*/
#include <string.h>	/* for strerror()	*/

void aix_loaderror(char *pathname)
{

	char *message[8], errbuf[1024];
	int i,j;

	struct errtab { 
		int errno;
		char *errstr;
	} load_errtab[] = {
		{L_ERROR_TOOMANY,	"to many errors, rest skipped."},
		{L_ERROR_NOLIB,		"can't load library:"},
		{L_ERROR_UNDEF,		"can't find symbol in library:"},
		{L_ERROR_RLDBAD,
		 "RLD index out of range or bad relocation type:"},
		{L_ERROR_FORMAT,	"not a valid, executable xcoff file:"},
		{L_ERROR_MEMBER,
		 "file not an archive or does not contain requested member:"},
		{L_ERROR_TYPE,		"symbol table mismatch:"},
		{L_ERROR_ALIGN,		"text allignment in file is wrong."},
		{L_ERROR_SYSTEM,	"System error:"},
		{L_ERROR_ERRNO,		NULL}
	};

#define LOAD_ERRTAB_LEN	(sizeof(load_errtab)/sizeof(load_errtab[0]))
#define ERRBUF_APPEND(s) strncat(errbuf, s, sizeof(errbuf)-strlen(errbuf)-1)

	sprintf(errbuf, " from module %.200s ", pathname);

	if (!loadquery(1, &message[0], sizeof(message))) 
		ERRBUF_APPEND(strerror(errno));
	for(i = 0; message[i] && *message[i]; i++) {
		int nerr = atoi(message[i]);
		for (j=0; j<LOAD_ERRTAB_LEN ; j++) {
		    if (nerr == load_errtab[i].errno && load_errtab[i].errstr)
			ERRBUF_APPEND(load_errtab[i].errstr);
		}
		while (isdigit(*message[i])) message[i]++ ; 
		ERRBUF_APPEND(message[i]);
		ERRBUF_APPEND("\n");
	}
	errbuf[strlen(errbuf)-1] = '\0';	/* trim off last newline */
	err_setstr(ImportError, errbuf); 
	return; 
}

#endif /* _AIX */