aboutsummaryrefslogtreecommitdiffstatshomepage
path: root/libraries/eina/src/lib/eina_module.c
blob: 0dd19a6623d5079a6920f5618ef5272055dbf2c4 (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
/* EINA - EFL data type library
 * Copyright (C) 2007-2008 Jorge Luis Zapata Muga, Cedric BAIL
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library;
 * if not, see <http://www.gnu.org/licenses/>.
 */

#ifdef HAVE_CONFIG_H
# include "config.h"
#endif

#ifdef HAVE_ALLOCA_H
# include <alloca.h>
#elif defined __GNUC__
# define alloca __builtin_alloca
#elif defined _AIX
# define alloca __alloca
#elif defined _MSC_VER
# include <malloc.h>
# define alloca _alloca
#else
# include <stddef.h>
# ifdef  __cplusplus
extern "C"
# endif
void *alloca (size_t);
#endif

#include <stdio.h>
#include <sys/types.h>
#include <string.h>

#ifdef HAVE_LIBGEN_H
# include <libgen.h>
#endif

#ifdef HAVE_DLOPEN
# include <dlfcn.h>
#endif

#ifdef HAVE_EVIL
# include <Evil.h>
#endif

#ifdef HAVE_ESCAPE
# include <Escape.h>
#endif

#include "eina_config.h"
#include "eina_private.h"
#include "eina_error.h"
#include "eina_file.h"
#include "eina_log.h"

/* undefs EINA_ARG_NONULL() so NULL checks are not compiled out! */
#include "eina_safety_checks.h"
#include "eina_module.h"

/*============================================================================*
*                                  Local                                     *
*============================================================================*/

/**
 * @cond LOCAL
 */

static int EINA_MODULE_LOG_DOM = -1;
#ifdef ERR
#undef ERR
#endif
#define ERR(...) EINA_LOG_DOM_ERR(EINA_MODULE_LOG_DOM, __VA_ARGS__)

#ifdef WRN
#undef WRN
#endif
#define WRN(...) EINA_LOG_DOM_WARN(EINA_MODULE_LOG_DOM, __VA_ARGS__)

#ifdef DBG
#undef DBG
#endif
#define DBG(...) EINA_LOG_DOM_DBG(EINA_MODULE_LOG_DOM, __VA_ARGS__)

#ifdef _WIN32
# define SEP_C '\\'
# define SEP_S "\\"
#else
# define SEP_C '/'
# define SEP_S "/"
#endif

#define EINA_MODULE_SYMBOL_INIT "__eina_module_init"
#define EINA_MODULE_SYMBOL_SHUTDOWN "__eina_module_shutdown"

struct _Eina_Module
{
   void *handle;
   int ref;
   const char file[];
};

typedef struct _Dir_List_Get_Cb_Data
{
   Eina_Module_Cb cb;
   void *data;
   Eina_Array *array;
} Dir_List_Get_Cb_Data;

typedef struct _Dir_List_Cb_Data
{
   Eina_Module_Cb cb;
   void *data;
} Dir_List_Cb_Data;

static Eina_Bool _dir_list_get_cb(Eina_Module *m, void *data)
{
   Dir_List_Get_Cb_Data *cb_data = data;
   Eina_Bool ret = EINA_TRUE;

   if (cb_data->cb)
      ret = cb_data->cb(m, cb_data->data);

   if (ret)
      eina_array_push(cb_data->array, m);

   return ret;
}

static void _dir_list_cb(const char *name, const char *path, void *data)
{
   Dir_List_Cb_Data *cb_data = data;
   size_t length;

   length = strlen(name);
   if (length < sizeof(SHARED_LIB_SUFFIX)) /* x.so */
      return;

   if (!strcmp(name + length - sizeof(SHARED_LIB_SUFFIX) + 1,
               SHARED_LIB_SUFFIX))
     {
        char *file;
        Eina_Module *m;

        length = strlen(path) + strlen(name) + 2;

        file = alloca(sizeof (char) * length);

        snprintf(file, length, "%s" SEP_S "%s", path, name);
        m = eina_module_new(file);
        if (!m)
          {
             return; /* call the user provided cb on this module */

          }

        if (!cb_data->cb(m, cb_data->data))
           eina_module_free(m);
     }
}

static void _dir_arch_list_cb(const char *name, const char *path, void *data)
{
   Dir_List_Get_Cb_Data *cb_data = data;
   Eina_Module *m;
   char *file = NULL;
   size_t length;

   length = strlen(path) + 1 + strlen(name) + 1 +
      strlen((char *)(cb_data->data)) + 1 + sizeof("module") +
      sizeof(SHARED_LIB_SUFFIX) + 1;

   file = alloca(length);
   snprintf(file, length, "%s" SEP_S "%s" SEP_S "%s" SEP_S "module" SHARED_LIB_SUFFIX,
            path, name, (char *)(cb_data->data));
   m = eina_module_new(file);
   if (!m)
      return;

   eina_array_push(cb_data->array, m);
}

/**
 * @endcond
 */


/*============================================================================*
*                                 Global                                     *
*============================================================================*/

/**
 * @cond LOCAL
 */

static const char EINA_ERROR_WRONG_MODULE_STR[] =
   "Wrong file format or no file module found";
static const char EINA_ERROR_MODULE_INIT_FAILED_STR[] =
   "Module initialisation function failed";

EAPI Eina_Error EINA_ERROR_WRONG_MODULE = 0;
EAPI Eina_Error EINA_ERROR_MODULE_INIT_FAILED = 0;

/**
 * @endcond
 */

/**
 * @internal
 * @brief Initialize the module loader module.
 *
 * @return #EINA_TRUE on success, #EINA_FALSE on failure.
 *
 * This function sets up the module loader module of Eina. It is
 * called by eina_init().
 *
 * This function sets up the module module of Eina. It also registers
 * the errors #EINA_ERROR_WRONG_MODULE and
 * #EINA_ERROR_MODULE_INIT_FAILED.
 *
 * @see eina_init()
 */
Eina_Bool
eina_module_init(void)
{
   EINA_MODULE_LOG_DOM = eina_log_domain_register
         ("eina_module", EINA_LOG_COLOR_DEFAULT);
   if (EINA_MODULE_LOG_DOM < 0)
     {
        EINA_LOG_ERR("Could not register log domain: eina_module");
        return EINA_FALSE;
     }

#define EEMR(n) n = eina_error_msg_static_register(n ## _STR)
   EEMR(EINA_ERROR_WRONG_MODULE);
   EEMR(EINA_ERROR_MODULE_INIT_FAILED);
#undef EEMR

   return EINA_TRUE;
}

/**
 * @internal
 * @brief Shut down the module loader module.
 *
 * @return #EINA_TRUE on success, #EINA_FALSE on failure.
 *
 * This function shuts down the module loader module set up by
 * eina_module_init(). It is called by eina_shutdown().
 *
 * @see eina_shutdown()
 */
Eina_Bool
eina_module_shutdown(void)
{
   /* TODO should we store every module when "new" is called and
    * delete the list of modules here
    */

   eina_log_domain_unregister(EINA_MODULE_LOG_DOM);
   EINA_MODULE_LOG_DOM = -1;
   return EINA_TRUE;
}

/*============================================================================*
*                                   API                                      *
*============================================================================*/

EAPI Eina_Module *eina_module_new(const char *file)
{
   Eina_Module *m;
   size_t len;

   EINA_SAFETY_ON_NULL_RETURN_VAL(file, NULL);
   /* TODO check that the file exists. Update doc too */

   len = strlen(file);
   EINA_SAFETY_ON_FALSE_RETURN_VAL(len > 0, NULL);

   m = malloc(sizeof(Eina_Module) + len + 1);
   if (!m)
     {
        ERR("could not malloc(%lu)",
            (unsigned long)(sizeof(Eina_Module) + len + 1));
        return NULL;
     }

   memcpy((char *)m->file, file, len + 1);
   m->ref = 0;
   m->handle = NULL;
   DBG("m=%p, file=%s", m, file);

   return m;
}

EAPI Eina_Bool eina_module_free(Eina_Module *m)
{
   EINA_SAFETY_ON_NULL_RETURN_VAL(m, EINA_FALSE);

   DBG("m=%p, handle=%p, file=%s, refs=%d", m, m->handle, m->file, m->ref);

   if (m->handle)
      if (eina_module_unload(m) == EINA_FALSE)
         return EINA_FALSE;

   free(m);
   return EINA_TRUE;
}

EAPI Eina_Bool eina_module_load(Eina_Module *m)
{
#ifdef HAVE_DLOPEN
   void *dl_handle;
   Eina_Module_Init *initcall;

   EINA_SAFETY_ON_NULL_RETURN_VAL(m, EINA_FALSE);

   DBG("m=%p, handle=%p, file=%s, refs=%d", m, m->handle, m->file, m->ref);

   if (m->handle)
      goto loaded;

   dl_handle = dlopen(m->file, RTLD_NOW);
   if (!dl_handle)
     {
        WRN("could not dlopen(\"%s\", RTLD_NOW): %s", m->file, dlerror());
        eina_error_set(EINA_ERROR_WRONG_MODULE);
        return EINA_FALSE;
     }

   initcall = dlsym(dl_handle, EINA_MODULE_SYMBOL_INIT);
   if ((!initcall) || (!(*initcall)))
      goto ok;

   if ((*initcall)() == EINA_TRUE)
      goto ok;

   WRN("could not find eina's entry symbol %s inside module %s",
       EINA_MODULE_SYMBOL_INIT, m->file);
   eina_error_set(EINA_ERROR_MODULE_INIT_FAILED);
   dlclose(dl_handle);
   return EINA_FALSE;
ok:
   DBG("successfully loaded %s", m->file);
   m->handle = dl_handle;
loaded:
   m->ref++;
   DBG("ref %d", m->ref);

   eina_error_set(0);
   return EINA_TRUE;
#else
   (void) m;
   return EINA_FALSE;
#endif
}

EAPI Eina_Bool eina_module_unload(Eina_Module *m)
{
#ifdef HAVE_DLOPEN
   Eina_Module_Shutdown *shut;
   EINA_SAFETY_ON_NULL_RETURN_VAL(m, EINA_FALSE);

   DBG("m=%p, handle=%p, file=%s, refs=%d", m, m->handle, m->file, m->ref);

   m->ref--;
   if (!m->ref)
     {
        shut = dlsym(m->handle, EINA_MODULE_SYMBOL_SHUTDOWN);
        if ((shut) && (*shut))
           (*shut)();

        dlclose(m->handle);
        m->handle = NULL;
        DBG("unloaded module %s", m->file);
        return EINA_TRUE;
     }

   return EINA_FALSE;
#else
   (void) m;
   return EINA_FALSE;
#endif
}

EAPI void *eina_module_symbol_get(const Eina_Module *m, const char *symbol)
{
#ifdef HAVE_DLOPEN
   EINA_SAFETY_ON_NULL_RETURN_VAL(m,         NULL);
   EINA_SAFETY_ON_NULL_RETURN_VAL(m->handle, NULL);
   return dlsym(m->handle, symbol);
#else
   (void) m;
   (void) symbol;
   return NULL;
#endif
}

EAPI const char *eina_module_file_get(const Eina_Module *m)
{
   EINA_SAFETY_ON_NULL_RETURN_VAL(m, NULL);
   return m->file;
}

EAPI char *eina_module_symbol_path_get(const void *symbol, const char *sub_dir)
{
#ifdef HAVE_DLADDR
   Dl_info eina_dl;

   EINA_SAFETY_ON_NULL_RETURN_VAL(symbol, NULL);

   if (dladdr(symbol, &eina_dl))
     {
        char *pos = strrchr(eina_dl.dli_fname, SEP_C);
        if (pos)
          {
             char *path;
             int l0;
             int l1;
             int l2 = 0;

             l0 = strlen(eina_dl.dli_fname);
             l1 = strlen(pos);
             if (sub_dir && (*sub_dir != '\0'))
                l2 = strlen(sub_dir);

             path = malloc(l0 - l1 + l2 + 1);
             if (path)
               {
                  memcpy(path, eina_dl.dli_fname, l0 - l1);
                  if (sub_dir && (*sub_dir != '\0'))
                     memcpy(path + l0 - l1, sub_dir, l2);

                  path[l0 - l1 + l2] = '\0';
                  return path;
               }
          }
     }
#else
   (void) symbol;
   (void) sub_dir;
#endif /* ! HAVE_DLADDR */

   return NULL;
}

EAPI char *eina_module_environment_path_get(const char *env,
                                            const char *sub_dir)
{
   const char *env_dir;

   EINA_SAFETY_ON_NULL_RETURN_VAL(env, NULL);

   env_dir = getenv(env);
   if (env_dir)
     {
        char *path;
        size_t l1;
        size_t l2 = 0;

        l1 = strlen(env_dir);
        if (sub_dir && (*sub_dir != '\0'))
           l2 = strlen(sub_dir);

        path = (char *)malloc(l1 + l2 + 1);
        if (path)
          {
                memcpy(path,      env_dir, l1);
             if (sub_dir && (*sub_dir != '\0'))
                memcpy(path + l1, sub_dir, l2);

             path[l1 + l2] = '\0';

             return path;
          }
     }

   return NULL;
}

EAPI Eina_Array *eina_module_arch_list_get(Eina_Array *array,
                                           const char *path,
                                           const char *arch)
{
   Dir_List_Get_Cb_Data list_get_cb_data;

   if ((!path) || (!arch))
      return array;

   list_get_cb_data.array = array ? array : eina_array_new(4);
   list_get_cb_data.cb = NULL;
   list_get_cb_data.data = (void *)arch;

   eina_file_dir_list(path, 0, &_dir_arch_list_cb, &list_get_cb_data);

   return list_get_cb_data.array;
}

EAPI Eina_Array *eina_module_list_get(Eina_Array *array,
                                      const char *path,
                                      Eina_Bool recursive,
                                      Eina_Module_Cb cb,
                                      void *data)
{
   Dir_List_Get_Cb_Data list_get_cb_data;
   Dir_List_Cb_Data list_cb_data;

   if (!path)
      return array;

   list_get_cb_data.array = array ? array : eina_array_new(4);
   list_get_cb_data.cb = cb;
   list_get_cb_data.data = data;

   list_cb_data.cb = &_dir_list_get_cb;
   list_cb_data.data = &list_get_cb_data;

   eina_file_dir_list(path, recursive, &_dir_list_cb, &list_cb_data);

   return list_get_cb_data.array;
}

EAPI Eina_Module *
eina_module_find(const Eina_Array *array, const char *module)
{
   unsigned int i;
   Eina_Array_Iterator iterator;
   Eina_Module *m;

   EINA_ARRAY_ITER_NEXT(array, i, m, iterator)
     {
        char *file_m;
        char *tmp;
        ssize_t len;

        /* basename() can modify its argument, so we first get a copie */
        /* do not use strdupa, as opensolaris does not have it */
        len = strlen(eina_module_file_get(m));
        tmp = alloca(len + 1);
        memcpy(tmp, eina_module_file_get(m), len + 1);
        file_m = basename(tmp);
        len = strlen(file_m);
        len -= sizeof(SHARED_LIB_SUFFIX) - 1;
        if (len <= 0)
           continue;

        if (!strncmp(module, file_m, len))
	   return m;;
     }

   return NULL;
}

EAPI void eina_module_list_load(Eina_Array *array)
{
   Eina_Array_Iterator iterator;
   Eina_Module *m;
   unsigned int i;

   EINA_SAFETY_ON_NULL_RETURN(array);
   DBG("array %p, count %u", array, array->count);
   EINA_ARRAY_ITER_NEXT(array, i, m, iterator)
     eina_module_load(m);
}

EAPI void eina_module_list_unload(Eina_Array *array)
{
   Eina_Array_Iterator iterator;
   Eina_Module *m;
   unsigned int i;

   EINA_SAFETY_ON_NULL_RETURN(array);
   DBG("array %p, count %u", array, array->count);
   EINA_ARRAY_ITER_NEXT(array, i, m, iterator)
     eina_module_unload(m);
}

EAPI void eina_module_list_free(Eina_Array *array)
{
   Eina_Array_Iterator iterator;
   Eina_Module *m;
   unsigned int i;

   EINA_SAFETY_ON_NULL_RETURN(array);
   DBG("array %p, count %u", array, array->count);
   EINA_ARRAY_ITER_NEXT(array, i, m, iterator)
     eina_module_free(m);

   eina_array_flush(array);
}