| 1 | /* |
| 2 | SDL - Simple DirectMedia Layer |
| 3 | Copyright (C) 1997-2009 Sam Lantinga |
| 4 | |
| 5 | This library is free software; you can redistribute it and/or |
| 6 | modify it under the terms of the GNU Lesser General Public |
| 7 | License as published by the Free Software Foundation; either |
| 8 | version 2.1 of the License, or (at your option) any later version. |
| 9 | |
| 10 | This library is distributed in the hope that it will be useful, |
| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 13 | Lesser General Public License for more details. |
| 14 | |
| 15 | You should have received a copy of the GNU Lesser General Public |
| 16 | License along with this library; if not, write to the Free Software |
| 17 | Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
| 18 | |
| 19 | Sam Lantinga |
| 20 | slouken@libsdl.org |
| 21 | */ |
| 22 | #include "SDL_config.h" |
| 23 | |
| 24 | #ifdef SDL_LOADSO_DLCOMPAT |
| 25 | |
| 26 | /* Please note that dlcompat apparently ships in current Mac OS X versions |
| 27 | * as a system library that provides compatibility with the Unix "dlopen" |
| 28 | * interface. In order to allow SDL to work on older OS X releases and also |
| 29 | * not conflict with the system lib on newer versions, we include dlcompat |
| 30 | * in SDL and change the symbols to prevent symbol clash with any existing |
| 31 | * system libraries. --ryan. |
| 32 | */ |
| 33 | |
| 34 | /* here is the dlcompat license: */ |
| 35 | |
| 36 | /* |
| 37 | Copyright (c) 2002 Jorge Acereda <jacereda@users.sourceforge.net> & |
| 38 | Peter O'Gorman <ogorman@users.sourceforge.net> |
| 39 | |
| 40 | Portions may be copyright others, see the AUTHORS file included with this |
| 41 | distribution. |
| 42 | |
| 43 | Maintained by Peter O'Gorman <ogorman@users.sourceforge.net> |
| 44 | |
| 45 | Bug Reports and other queries should go to <ogorman@users.sourceforge.net> |
| 46 | |
| 47 | Permission is hereby granted, free of charge, to any person obtaining |
| 48 | a copy of this software and associated documentation files (the |
| 49 | "Software"), to deal in the Software without restriction, including |
| 50 | without limitation the rights to use, copy, modify, merge, publish, |
| 51 | distribute, sublicense, and/or sell copies of the Software, and to |
| 52 | permit persons to whom the Software is furnished to do so, subject to |
| 53 | the following conditions: |
| 54 | |
| 55 | The above copyright notice and this permission notice shall be |
| 56 | included in all copies or substantial portions of the Software. |
| 57 | |
| 58 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, |
| 59 | EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF |
| 60 | MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND |
| 61 | NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE |
| 62 | LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION |
| 63 | OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION |
| 64 | WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. |
| 65 | */ |
| 66 | |
| 67 | #include <pthread.h> |
| 68 | #include <sys/types.h> |
| 69 | #include <sys/stat.h> |
| 70 | #include <stdarg.h> |
| 71 | #include <limits.h> |
| 72 | #include <mach-o/dyld.h> |
| 73 | #include <mach-o/nlist.h> |
| 74 | #include <mach-o/getsect.h> |
| 75 | |
| 76 | #include "SDL_stdinc.h" |
| 77 | |
| 78 | /* Just playing to see if it would compile with the freebsd headers, it does, |
| 79 | * but because of the different values for RTLD_LOCAL etc, it would break binary |
| 80 | * compat... oh well |
| 81 | */ |
| 82 | #ifndef __BSD_VISIBLE |
| 83 | #define __BSD_VISIBLE 1 |
| 84 | #endif |
| 85 | |
| 86 | /*include "dlfcn.h"*/ |
| 87 | #ifdef __cplusplus |
| 88 | extern "C" { |
| 89 | #endif |
| 90 | |
| 91 | #if defined (__GNUC__) && __GNUC__ > 3 |
| 92 | #define dl_restrict __restrict |
| 93 | #else |
| 94 | #define dl_restrict |
| 95 | #endif |
| 96 | |
| 97 | #if 0 |
| 98 | #ifndef _POSIX_SOURCE |
| 99 | /* |
| 100 | * Structure filled in by dladdr(). |
| 101 | */ |
| 102 | typedef struct SDL_OSX_dl_info { |
| 103 | const char *dli_fname; /* Pathname of shared object */ |
| 104 | void *dli_fbase; /* Base address of shared object */ |
| 105 | const char *dli_sname; /* Name of nearest symbol */ |
| 106 | void *dli_saddr; /* Address of nearest symbol */ |
| 107 | } SDL_OSX_Dl_info; |
| 108 | |
| 109 | static int SDL_OSX_dladdr(const void * dl_restrict, SDL_OSX_Dl_info * dl_restrict); |
| 110 | #endif /* ! _POSIX_SOURCE */ |
| 111 | #endif /* 0 */ |
| 112 | |
| 113 | static int SDL_OSX_dlclose(void * handle); |
| 114 | static const char * SDL_OSX_dlerror(void); |
| 115 | static void * SDL_OSX_dlopen(const char *path, int mode); |
| 116 | static void * SDL_OSX_dlsym(void * dl_restrict handle, const char * dl_restrict symbol); |
| 117 | |
| 118 | #define RTLD_LAZY 0x1 |
| 119 | #define RTLD_NOW 0x2 |
| 120 | #define RTLD_LOCAL 0x4 |
| 121 | #define RTLD_GLOBAL 0x8 |
| 122 | |
| 123 | #ifndef _POSIX_SOURCE |
| 124 | #define RTLD_NOLOAD 0x10 |
| 125 | #define RTLD_NODELETE 0x80 |
| 126 | |
| 127 | /* |
| 128 | * Special handle arguments for SDL_OSX_dlsym(). |
| 129 | */ |
| 130 | #define RTLD_NEXT ((void *) -1) /* Search subsequent objects. */ |
| 131 | #define RTLD_DEFAULT ((void *) -2) /* Use default search algorithm. */ |
| 132 | #endif /* ! _POSIX_SOURCE */ |
| 133 | |
| 134 | #ifdef __cplusplus |
| 135 | } |
| 136 | #endif |
| 137 | |
| 138 | #ifndef dl_restrict |
| 139 | #define dl_restrict __restrict |
| 140 | #endif |
| 141 | /* This is not available on 10.1 */ |
| 142 | #ifndef LC_LOAD_WEAK_DYLIB |
| 143 | #define LC_LOAD_WEAK_DYLIB (0x18 | LC_REQ_DYLD) |
| 144 | #endif |
| 145 | |
| 146 | /* With this stuff here, this thing may actually compile/run on 10.0 systems |
| 147 | * Not that I have a 10.0 system to test it on anylonger |
| 148 | */ |
| 149 | #ifndef LC_REQ_DYLD |
| 150 | #define LC_REQ_DYLD 0x80000000 |
| 151 | #endif |
| 152 | #ifndef NSADDIMAGE_OPTION_RETURN_ONLY_IF_LOADED |
| 153 | #define NSADDIMAGE_OPTION_RETURN_ONLY_IF_LOADED 0x4 |
| 154 | #endif |
| 155 | #ifndef NSADDIMAGE_OPTION_RETURN_ON_ERROR |
| 156 | #define NSADDIMAGE_OPTION_RETURN_ON_ERROR 0x1 |
| 157 | #endif |
| 158 | #ifndef NSLOOKUPSYMBOLINIMAGE_OPTION_BIND |
| 159 | #define NSLOOKUPSYMBOLINIMAGE_OPTION_BIND 0x0 |
| 160 | #endif |
| 161 | #ifndef NSLOOKUPSYMBOLINIMAGE_OPTION_RETURN_ON_ERROR |
| 162 | #define NSLOOKUPSYMBOLINIMAGE_OPTION_RETURN_ON_ERROR 0x4 |
| 163 | #endif |
| 164 | /* These symbols will be looked for in dyld */ |
| 165 | static const struct mach_header *(*dyld_NSAddImage) (const char *, unsigned long) = 0; |
| 166 | static int (*dyld_NSIsSymbolNameDefinedInImage) (const struct mach_header *, const char *) = 0; |
| 167 | static NSSymbol(*dyld_NSLookupSymbolInImage) |
| 168 | (const struct mach_header *, const char *, unsigned long) = 0; |
| 169 | |
| 170 | /* Define this to make dlcompat reuse data block. This way in theory we save |
| 171 | * a little bit of overhead. However we then couldn't correctly catch excess |
| 172 | * calls to SDL_OSX_dlclose(). Hence we don't use this feature |
| 173 | */ |
| 174 | #undef REUSE_STATUS |
| 175 | |
| 176 | /* Size of the internal error message buffer (used by dlerror()) */ |
| 177 | #define ERR_STR_LEN 251 |
| 178 | |
| 179 | /* Maximum number of search paths supported by getSearchPath */ |
| 180 | #define MAX_SEARCH_PATHS 32 |
| 181 | |
| 182 | |
| 183 | #define MAGIC_DYLIB_OFI ((NSObjectFileImage) 'DYOF') |
| 184 | #define MAGIC_DYLIB_MOD ((NSModule) 'DYMO') |
| 185 | |
| 186 | /* internal flags */ |
| 187 | #define DL_IN_LIST 0x01 |
| 188 | |
| 189 | /* our mutex */ |
| 190 | static pthread_mutex_t dlcompat_mutex; |
| 191 | /* Our thread specific storage |
| 192 | */ |
| 193 | static pthread_key_t dlerror_key; |
| 194 | |
| 195 | struct dlthread |
| 196 | { |
| 197 | int lockcnt; |
| 198 | unsigned char errset; |
| 199 | char errstr[ERR_STR_LEN]; |
| 200 | }; |
| 201 | |
| 202 | /* This is our central data structure. Whenever a module is loaded via |
| 203 | * SDL_OSX_dlopen(), we create such a struct. |
| 204 | */ |
| 205 | struct dlstatus |
| 206 | { |
| 207 | struct dlstatus *next; /* pointer to next element in the linked list */ |
| 208 | NSModule module; |
| 209 | const struct mach_header *lib; |
| 210 | int refs; /* reference count */ |
| 211 | int mode; /* mode in which this module was loaded */ |
| 212 | dev_t device; |
| 213 | ino_t inode; |
| 214 | int flags; /* Any internal flags we may need */ |
| 215 | }; |
| 216 | |
| 217 | /* Head node of the dlstatus list */ |
| 218 | static struct dlstatus mainStatus = { 0, MAGIC_DYLIB_MOD, NULL, -1, RTLD_GLOBAL, 0, 0, 0 }; |
| 219 | static struct dlstatus *stqueue = &mainStatus; |
| 220 | |
| 221 | |
| 222 | /* Storage for the last error message (used by dlerror()) */ |
| 223 | /* static char err_str[ERR_STR_LEN]; */ |
| 224 | /* static int err_filled = 0; */ |
| 225 | |
| 226 | /* Prototypes to internal functions */ |
| 227 | static void debug(const char *fmt, ...); |
| 228 | static void error(const char *str, ...); |
| 229 | static const char *safegetenv(const char *s); |
| 230 | static const char *searchList(void); |
| 231 | static const char *getSearchPath(int i); |
| 232 | static const char *getFullPath(int i, const char *file); |
| 233 | static const struct stat *findFile(const char *file, const char **fullPath); |
| 234 | static int isValidStatus(struct dlstatus *status); |
| 235 | static inline int isFlagSet(int mode, int flag); |
| 236 | static struct dlstatus *lookupStatus(const struct stat *sbuf); |
| 237 | static void insertStatus(struct dlstatus *dls, const struct stat *sbuf); |
| 238 | static int promoteLocalToGlobal(struct dlstatus *dls); |
| 239 | static void *reference(struct dlstatus *dls, int mode); |
| 240 | static void *dlsymIntern(struct dlstatus *dls, const char *symbol, int canSetError); |
| 241 | static struct dlstatus *allocStatus(void); |
| 242 | static struct dlstatus *loadModule(const char *path, const struct stat *sbuf, int mode); |
| 243 | static NSSymbol search_linked_libs(const struct mach_header *mh, const char *symbol); |
| 244 | static const char *get_lib_name(const struct mach_header *mh); |
| 245 | static const struct mach_header *get_mach_header_from_NSModule(NSModule mod); |
| 246 | static void dlcompat_init_func(void); |
| 247 | static inline void dlcompat_init_check(void); |
| 248 | static inline void dolock(void); |
| 249 | static inline void dounlock(void); |
| 250 | static void dlerrorfree(void *data); |
| 251 | static void resetdlerror(void); |
| 252 | static const struct mach_header *my_find_image(const char *name); |
| 253 | static const struct mach_header *image_for_address(const void *address); |
| 254 | static inline char *dyld_error_str(void); |
| 255 | |
| 256 | #if FINK_BUILD |
| 257 | /* Two Global Functions */ |
| 258 | static void *dlsym_prepend_underscore(void *handle, const char *symbol); |
| 259 | static void *dlsym_auto_underscore(void *handle, const char *symbol); |
| 260 | |
| 261 | /* And their _intern counterparts */ |
| 262 | static void *dlsym_prepend_underscore_intern(void *handle, const char *symbol); |
| 263 | static void *dlsym_auto_underscore_intern(void *handle, const char *symbol); |
| 264 | #endif |
| 265 | |
| 266 | /* Functions */ |
| 267 | |
| 268 | static void debug(const char *fmt, ...) |
| 269 | { |
| 270 | #if DEBUG > 1 |
| 271 | va_list arg; |
| 272 | va_start(arg, fmt); |
| 273 | fprintf(stderr, "DLDEBUG: "); |
| 274 | vfprintf(stderr, fmt, arg); |
| 275 | fprintf(stderr, "\n"); |
| 276 | fflush(stderr); |
| 277 | va_end(arg); |
| 278 | #endif |
| 279 | } |
| 280 | |
| 281 | static void error(const char *str, ...) |
| 282 | { |
| 283 | va_list arg; |
| 284 | struct dlthread *tss; |
| 285 | char * err_str; |
| 286 | va_start(arg, str); |
| 287 | tss = pthread_getspecific(dlerror_key); |
| 288 | err_str = tss->errstr; |
| 289 | SDL_strlcpy(err_str, "dlcompat: ", ERR_STR_LEN); |
| 290 | vsnprintf(err_str + 10, ERR_STR_LEN - 10, str, arg); |
| 291 | va_end(arg); |
| 292 | debug("ERROR: %s\n", err_str); |
| 293 | tss->errset = 1; |
| 294 | } |
| 295 | |
| 296 | static void warning(const char *str) |
| 297 | { |
| 298 | #if DEBUG > 0 |
| 299 | fprintf(stderr, "WARNING: dlcompat: %s\n", str); |
| 300 | #endif |
| 301 | } |
| 302 | |
| 303 | static const char *safegetenv(const char *s) |
| 304 | { |
| 305 | const char *ss = SDL_getenv(s); |
| 306 | return ss ? ss : ""; |
| 307 | } |
| 308 | |
| 309 | /* because this is only used for debugging and error reporting functions, we |
| 310 | * don't really care about how elegant it is... it could use the load |
| 311 | * commands to find the install name of the library, but... |
| 312 | */ |
| 313 | static const char *get_lib_name(const struct mach_header *mh) |
| 314 | { |
| 315 | unsigned long count = _dyld_image_count(); |
| 316 | unsigned long i; |
| 317 | const char *val = NULL; |
| 318 | if (mh) |
| 319 | { |
| 320 | for (i = 0; i < count; i++) |
| 321 | { |
| 322 | if (mh == _dyld_get_image_header(i)) |
| 323 | { |
| 324 | val = _dyld_get_image_name(i); |
| 325 | break; |
| 326 | } |
| 327 | } |
| 328 | } |
| 329 | return val; |
| 330 | } |
| 331 | |
| 332 | /* Returns the mach_header for the module bu going through all the loaded images |
| 333 | * and finding the one with the same name as the module. There really ought to be |
| 334 | * an api for doing this, would be faster, but there isn't one right now |
| 335 | */ |
| 336 | static const struct mach_header *get_mach_header_from_NSModule(NSModule mod) |
| 337 | { |
| 338 | const char *mod_name = NSNameOfModule(mod); |
| 339 | const struct mach_header *mh = NULL; |
| 340 | unsigned long count = _dyld_image_count(); |
| 341 | unsigned long i; |
| 342 | debug("Module name: %s", mod_name); |
| 343 | for (i = 0; i < count; i++) |
| 344 | { |
| 345 | if (!SDL_strcmp(mod_name, _dyld_get_image_name(i))) |
| 346 | { |
| 347 | mh = _dyld_get_image_header(i); |
| 348 | break; |
| 349 | } |
| 350 | } |
| 351 | return mh; |
| 352 | } |
| 353 | |
| 354 | |
| 355 | /* Compute and return a list of all directories that we should search when |
| 356 | * trying to locate a module. We first look at the values of LD_LIBRARY_PATH |
| 357 | * and DYLD_LIBRARY_PATH, and then finally fall back to looking into |
| 358 | * /usr/lib and /lib. Since both of the environments variables can contain a |
| 359 | * list of colon seperated paths, we simply concat them and the two other paths |
| 360 | * into one big string, which we then can easily parse. |
| 361 | * Splitting this string into the actual path list is done by getSearchPath() |
| 362 | */ |
| 363 | static const char *searchList() |
| 364 | { |
| 365 | size_t buf_size; |
| 366 | static char *buf=NULL; |
| 367 | const char *ldlp = safegetenv("LD_LIBRARY_PATH"); |
| 368 | const char *dyldlp = safegetenv("DYLD_LIBRARY_PATH"); |
| 369 | const char *stdpath = SDL_getenv("DYLD_FALLBACK_LIBRARY_PATH"); |
| 370 | if (!stdpath) |
| 371 | stdpath = "/usr/local/lib:/lib:/usr/lib"; |
| 372 | if (!buf) |
| 373 | { |
| 374 | buf_size = SDL_strlen(ldlp) + SDL_strlen(dyldlp) + SDL_strlen(stdpath) + 4; |
| 375 | buf = SDL_malloc(buf_size); |
| 376 | SDL_snprintf(buf, buf_size, "%s%s%s%s%s%c", dyldlp, (dyldlp[0] ? ":" : ""), ldlp, (ldlp[0] ? ":" : ""), |
| 377 | stdpath, '\0'); |
| 378 | } |
| 379 | return buf; |
| 380 | } |
| 381 | |
| 382 | /* Returns the ith search path from the list as computed by searchList() */ |
| 383 | static const char *getSearchPath(int i) |
| 384 | { |
| 385 | static const char *list = 0; |
| 386 | static char **path = (char **)0; |
| 387 | static int end = 0; |
| 388 | static int numsize = MAX_SEARCH_PATHS; |
| 389 | static char **tmp; |
| 390 | /* So we can call SDL_free() in the "destructor" we use i=-1 to return the alloc'd array */ |
| 391 | if (i == -1) |
| 392 | { |
| 393 | return (const char*)path; |
| 394 | } |
| 395 | if (!path) |
| 396 | { |
| 397 | path = (char **)SDL_calloc(MAX_SEARCH_PATHS, sizeof(char **)); |
| 398 | } |
| 399 | if (!list && !end) |
| 400 | list = searchList(); |
| 401 | if (i >= (numsize)) |
| 402 | { |
| 403 | debug("Increasing size for long PATH"); |
| 404 | tmp = (char **)SDL_calloc((MAX_SEARCH_PATHS + numsize), sizeof(char **)); |
| 405 | if (tmp) |
| 406 | { |
| 407 | SDL_memcpy(tmp, path, sizeof(char **) * numsize); |
| 408 | SDL_free(path); |
| 409 | path = tmp; |
| 410 | numsize += MAX_SEARCH_PATHS; |
| 411 | } |
| 412 | else |
| 413 | { |
| 414 | return 0; |
| 415 | } |
| 416 | } |
| 417 | |
| 418 | while (!path[i] && !end) |
| 419 | { |
| 420 | path[i] = strsep((char **)&list, ":"); |
| 421 | |
| 422 | if (path[i][0] == 0) |
| 423 | path[i] = 0; |
| 424 | end = (list == 0); |
| 425 | } |
| 426 | return path[i]; |
| 427 | } |
| 428 | |
| 429 | static const char *getFullPath(int i, const char *file) |
| 430 | { |
| 431 | static char buf[PATH_MAX]; |
| 432 | const char *path = getSearchPath(i); |
| 433 | if (path) |
| 434 | { |
| 435 | SDL_snprintf(buf, PATH_MAX, "%s/%s", path, file); |
| 436 | } |
| 437 | return path ? buf : 0; |
| 438 | } |
| 439 | |
| 440 | /* Given a file name, try to determine the full path for that file. Starts |
| 441 | * its search in the current directory, and then tries all paths in the |
| 442 | * search list in the order they are specified there. |
| 443 | */ |
| 444 | static const struct stat *findFile(const char *file, const char **fullPath) |
| 445 | { |
| 446 | int i = 0; |
| 447 | static struct stat sbuf; |
| 448 | char *fileName; |
| 449 | debug("finding file %s", file); |
| 450 | *fullPath = file; |
| 451 | if (0 == stat(file, &sbuf)) |
| 452 | return &sbuf; |
| 453 | if (SDL_strchr(file, '/')) |
| 454 | return 0; /* If the path had a / we don't look in env var places */ |
| 455 | fileName = NULL; |
| 456 | if (!fileName) |
| 457 | fileName = (char *)file; |
| 458 | while ((*fullPath = getFullPath(i++, fileName))) |
| 459 | { |
| 460 | if (0 == stat(*fullPath, &sbuf)) |
| 461 | return &sbuf; |
| 462 | } |
| 463 | ; |
| 464 | return 0; |
| 465 | } |
| 466 | |
| 467 | /* Determine whether a given dlstatus is valid or not */ |
| 468 | static int isValidStatus(struct dlstatus *status) |
| 469 | { |
| 470 | /* Walk the list to verify status is contained in it */ |
| 471 | struct dlstatus *dls = stqueue; |
| 472 | while (dls && status != dls) |
| 473 | dls = dls->next; |
| 474 | if (dls == 0) |
| 475 | error("invalid handle"); |
| 476 | else if ((dls->module == 0) || (dls->refs == 0)) |
| 477 | error("handle to closed library"); |
| 478 | else |
| 479 | return TRUE; |
| 480 | return FALSE; |
| 481 | } |
| 482 | |
| 483 | static inline int isFlagSet(int mode, int flag) |
| 484 | { |
| 485 | return (mode & flag) == flag; |
| 486 | } |
| 487 | |
| 488 | static struct dlstatus *lookupStatus(const struct stat *sbuf) |
| 489 | { |
| 490 | struct dlstatus *dls = stqueue; |
| 491 | debug("looking for status"); |
| 492 | while (dls && ( /* isFlagSet(dls->mode, RTLD_UNSHARED) */ 0 |
| 493 | || sbuf->st_dev != dls->device || sbuf->st_ino != dls->inode)) |
| 494 | dls = dls->next; |
| 495 | return dls; |
| 496 | } |
| 497 | |
| 498 | static void insertStatus(struct dlstatus *dls, const struct stat *sbuf) |
| 499 | { |
| 500 | debug("inserting status"); |
| 501 | dls->inode = sbuf->st_ino; |
| 502 | dls->device = sbuf->st_dev; |
| 503 | dls->refs = 0; |
| 504 | dls->mode = 0; |
| 505 | if ((dls->flags & DL_IN_LIST) == 0) |
| 506 | { |
| 507 | dls->next = stqueue; |
| 508 | stqueue = dls; |
| 509 | dls->flags |= DL_IN_LIST; |
| 510 | } |
| 511 | } |
| 512 | |
| 513 | static struct dlstatus *allocStatus() |
| 514 | { |
| 515 | struct dlstatus *dls; |
| 516 | #ifdef REUSE_STATUS |
| 517 | dls = stqueue; |
| 518 | while (dls && dls->module) |
| 519 | dls = dls->next; |
| 520 | if (!dls) |
| 521 | #endif |
| 522 | dls = SDL_calloc(sizeof(*dls),1); |
| 523 | return dls; |
| 524 | } |
| 525 | |
| 526 | static int promoteLocalToGlobal(struct dlstatus *dls) |
| 527 | { |
| 528 | static int (*p) (NSModule module) = 0; |
| 529 | debug("promoting"); |
| 530 | if (!p) |
| 531 | _dyld_func_lookup("__dyld_NSMakePrivateModulePublic", (void **)&p); |
| 532 | return (dls->module == MAGIC_DYLIB_MOD) || (p && p(dls->module)); |
| 533 | } |
| 534 | |
| 535 | static void *reference(struct dlstatus *dls, int mode) |
| 536 | { |
| 537 | if (dls) |
| 538 | { |
| 539 | if (dls->module == MAGIC_DYLIB_MOD && isFlagSet(mode, RTLD_LOCAL)) |
| 540 | { |
| 541 | warning("trying to open a .dylib with RTLD_LOCAL"); |
| 542 | error("unable to open a .dylib with RTLD_LOCAL"); |
| 543 | return NULL; |
| 544 | } |
| 545 | if (isFlagSet(mode, RTLD_GLOBAL) && |
| 546 | !isFlagSet(dls->mode, RTLD_GLOBAL) && !promoteLocalToGlobal(dls)) |
| 547 | { |
| 548 | error("unable to promote local module to global"); |
| 549 | return NULL; |
| 550 | } |
| 551 | dls->mode |= mode; |
| 552 | dls->refs++; |
| 553 | } |
| 554 | else |
| 555 | debug("reference called with NULL argument"); |
| 556 | |
| 557 | return dls; |
| 558 | } |
| 559 | |
| 560 | static const struct mach_header *my_find_image(const char *name) |
| 561 | { |
| 562 | const struct mach_header *mh = 0; |
| 563 | const char *id = NULL; |
| 564 | int i = _dyld_image_count(); |
| 565 | int j; |
| 566 | mh = (struct mach_header *) |
| 567 | dyld_NSAddImage(name, NSADDIMAGE_OPTION_RETURN_ONLY_IF_LOADED | |
| 568 | NSADDIMAGE_OPTION_RETURN_ON_ERROR); |
| 569 | if (!mh) |
| 570 | { |
| 571 | for (j = 0; j < i; j++) |
| 572 | { |
| 573 | id = _dyld_get_image_name(j); |
| 574 | if (!SDL_strcmp(id, name)) |
| 575 | { |
| 576 | mh = _dyld_get_image_header(j); |
| 577 | break; |
| 578 | } |
| 579 | } |
| 580 | } |
| 581 | return mh; |
| 582 | } |
| 583 | |
| 584 | /* |
| 585 | * dyld adds libraries by first adding the directly dependant libraries in link order, and |
| 586 | * then adding the dependencies for those libraries, so we should do the same... but we don't |
| 587 | * bother adding the extra dependencies, if the symbols are neither in the loaded image nor |
| 588 | * any of it's direct dependencies, then it probably isn't there. |
| 589 | */ |
| 590 | static NSSymbol search_linked_libs(const struct mach_header * mh, const char *symbol) |
| 591 | { |
| 592 | unsigned int n; |
| 593 | struct load_command *lc = 0; |
| 594 | struct mach_header *wh; |
| 595 | NSSymbol nssym = 0; |
| 596 | if (dyld_NSAddImage && dyld_NSIsSymbolNameDefinedInImage && dyld_NSLookupSymbolInImage) |
| 597 | { |
| 598 | lc = (struct load_command *)((char *)mh + sizeof(struct mach_header)); |
| 599 | for (n = 0; n < mh->ncmds; n++, lc = (struct load_command *)((char *)lc + lc->cmdsize)) |
| 600 | { |
| 601 | if ((LC_LOAD_DYLIB == lc->cmd) || (LC_LOAD_WEAK_DYLIB == lc->cmd)) |
| 602 | { |
| 603 | if ((wh = (struct mach_header *) |
| 604 | my_find_image((char *)(((struct dylib_command *)lc)->dylib.name.offset + |
| 605 | (char *)lc)))) |
| 606 | { |
| 607 | if (dyld_NSIsSymbolNameDefinedInImage(wh, symbol)) |
| 608 | { |
| 609 | nssym = dyld_NSLookupSymbolInImage(wh, |
| 610 | symbol, |
| 611 | NSLOOKUPSYMBOLINIMAGE_OPTION_BIND | |
| 612 | NSLOOKUPSYMBOLINIMAGE_OPTION_RETURN_ON_ERROR); |
| 613 | break; |
| 614 | } |
| 615 | } |
| 616 | } |
| 617 | } |
| 618 | if ((!nssym) && NSIsSymbolNameDefined(symbol)) |
| 619 | { |
| 620 | /* I've never seen this debug message...*/ |
| 621 | debug("Symbol \"%s\" is defined but was not found", symbol); |
| 622 | } |
| 623 | } |
| 624 | return nssym; |
| 625 | } |
| 626 | |
| 627 | /* Up to the caller to SDL_free() returned string */ |
| 628 | static inline char *dyld_error_str() |
| 629 | { |
| 630 | NSLinkEditErrors dylder; |
| 631 | int dylderno; |
| 632 | const char *dylderrstr; |
| 633 | const char *dyldfile; |
| 634 | char* retStr = NULL; |
| 635 | NSLinkEditError(&dylder, &dylderno, &dyldfile, &dylderrstr); |
| 636 | if (dylderrstr && *dylderrstr) |
| 637 | { |
| 638 | retStr = SDL_strdup(dylderrstr); |
| 639 | } |
| 640 | return retStr; |
| 641 | } |
| 642 | |
| 643 | static void *dlsymIntern(struct dlstatus *dls, const char *symbol, int canSetError) |
| 644 | { |
| 645 | NSSymbol nssym = 0; |
| 646 | #ifdef __GCC__ |
| 647 | void *caller = __builtin_return_address(1); /* Be *very* careful about inlining */ |
| 648 | #else |
| 649 | void *caller = NULL; |
| 650 | #endif |
| 651 | const struct mach_header *caller_mh = 0; |
| 652 | char *savedErrorStr = NULL; |
| 653 | resetdlerror(); |
| 654 | #ifndef RTLD_SELF |
| 655 | #define RTLD_SELF ((void *) -3) |
| 656 | #endif |
| 657 | if (NULL == dls) |
| 658 | dls = RTLD_SELF; |
| 659 | if ((RTLD_NEXT == dls) || (RTLD_SELF == dls)) |
| 660 | { |
| 661 | if (dyld_NSIsSymbolNameDefinedInImage && dyld_NSLookupSymbolInImage && caller) |
| 662 | { |
| 663 | caller_mh = image_for_address(caller); |
| 664 | if (RTLD_SELF == dls) |
| 665 | { |
| 666 | /* FIXME: We should be using the NSModule api, if SELF is an MH_BUNDLE |
| 667 | * But it appears to work anyway, and looking at the code in dyld_libfuncs.c |
| 668 | * this is acceptable. |
| 669 | */ |
| 670 | if (dyld_NSIsSymbolNameDefinedInImage(caller_mh, symbol)) |
| 671 | { |
| 672 | nssym = dyld_NSLookupSymbolInImage(caller_mh, |
| 673 | symbol, |
| 674 | NSLOOKUPSYMBOLINIMAGE_OPTION_BIND | |
| 675 | NSLOOKUPSYMBOLINIMAGE_OPTION_RETURN_ON_ERROR); |
| 676 | } |
| 677 | } |
| 678 | if (!nssym) |
| 679 | { |
| 680 | if (RTLD_SELF == dls) |
| 681 | savedErrorStr = dyld_error_str(); |
| 682 | nssym = search_linked_libs(caller_mh, symbol); |
| 683 | } |
| 684 | } |
| 685 | else |
| 686 | { |
| 687 | if (canSetError) |
| 688 | error("RTLD_SELF and RTLD_NEXT are not supported"); |
| 689 | return NULL; |
| 690 | } |
| 691 | } |
| 692 | if (!nssym) |
| 693 | { |
| 694 | |
| 695 | if (RTLD_DEFAULT == dls) |
| 696 | { |
| 697 | dls = &mainStatus; |
| 698 | } |
| 699 | if (!isValidStatus(dls)) |
| 700 | return NULL; |
| 701 | |
| 702 | if (dls->module != MAGIC_DYLIB_MOD) |
| 703 | { |
| 704 | nssym = NSLookupSymbolInModule(dls->module, symbol); |
| 705 | if (!nssym && NSIsSymbolNameDefined(symbol)) |
| 706 | { |
| 707 | debug("Searching dependencies"); |
| 708 | savedErrorStr = dyld_error_str(); |
| 709 | nssym = search_linked_libs(get_mach_header_from_NSModule(dls->module), symbol); |
| 710 | } |
| 711 | } |
| 712 | else if (dls->lib && dyld_NSIsSymbolNameDefinedInImage && dyld_NSLookupSymbolInImage) |
| 713 | { |
| 714 | if (dyld_NSIsSymbolNameDefinedInImage(dls->lib, symbol)) |
| 715 | { |
| 716 | nssym = dyld_NSLookupSymbolInImage(dls->lib, |
| 717 | symbol, |
| 718 | NSLOOKUPSYMBOLINIMAGE_OPTION_BIND | |
| 719 | NSLOOKUPSYMBOLINIMAGE_OPTION_RETURN_ON_ERROR); |
| 720 | } |
| 721 | else if (NSIsSymbolNameDefined(symbol)) |
| 722 | { |
| 723 | debug("Searching dependencies"); |
| 724 | savedErrorStr = dyld_error_str(); |
| 725 | nssym = search_linked_libs(dls->lib, symbol); |
| 726 | } |
| 727 | } |
| 728 | else if (dls->module == MAGIC_DYLIB_MOD) |
| 729 | { |
| 730 | /* Global context, use NSLookupAndBindSymbol */ |
| 731 | if (NSIsSymbolNameDefined(symbol)) |
| 732 | { |
| 733 | /* There doesn't seem to be a return on error option for this call??? |
| 734 | this is potentially broken, if binding fails, it will improperly |
| 735 | exit the application. */ |
| 736 | nssym = NSLookupAndBindSymbol(symbol); |
| 737 | } |
| 738 | else |
| 739 | { |
| 740 | if (savedErrorStr) |
| 741 | SDL_free(savedErrorStr); |
| 742 | savedErrorStr = SDL_malloc(256); |
| 743 | SDL_snprintf(savedErrorStr, 256, "Symbol \"%s\" not in global context",symbol); |
| 744 | } |
| 745 | } |
| 746 | } |
| 747 | /* Error reporting */ |
| 748 | if (!nssym) |
| 749 | { |
| 750 | if (!savedErrorStr || !SDL_strlen(savedErrorStr)) |
| 751 | { |
| 752 | if (savedErrorStr) |
| 753 | SDL_free(savedErrorStr); |
| 754 | savedErrorStr = SDL_malloc(256); |
| 755 | SDL_snprintf(savedErrorStr, 256,"Symbol \"%s\" not found",symbol); |
| 756 | } |
| 757 | if (canSetError) |
| 758 | { |
| 759 | error(savedErrorStr); |
| 760 | } |
| 761 | else |
| 762 | { |
| 763 | debug(savedErrorStr); |
| 764 | } |
| 765 | if (savedErrorStr) |
| 766 | SDL_free(savedErrorStr); |
| 767 | return NULL; |
| 768 | } |
| 769 | return NSAddressOfSymbol(nssym); |
| 770 | } |
| 771 | |
| 772 | static struct dlstatus *loadModule(const char *path, const struct stat *sbuf, int mode) |
| 773 | { |
| 774 | NSObjectFileImage ofi = 0; |
| 775 | NSObjectFileImageReturnCode ofirc; |
| 776 | struct dlstatus *dls; |
| 777 | NSLinkEditErrors ler; |
| 778 | int lerno; |
| 779 | const char *errstr; |
| 780 | const char *file; |
| 781 | void (*init) (void); |
| 782 | |
| 783 | ofirc = NSCreateObjectFileImageFromFile(path, &ofi); |
| 784 | switch (ofirc) |
| 785 | { |
| 786 | case NSObjectFileImageSuccess: |
| 787 | break; |
| 788 | case NSObjectFileImageInappropriateFile: |
| 789 | if (dyld_NSAddImage && dyld_NSIsSymbolNameDefinedInImage && dyld_NSLookupSymbolInImage) |
| 790 | { |
| 791 | if (isFlagSet(mode, RTLD_LOCAL)) |
| 792 | { |
| 793 | warning("trying to open a .dylib with RTLD_LOCAL"); |
| 794 | error("unable to open this file with RTLD_LOCAL"); |
| 795 | return NULL; |
| 796 | } |
| 797 | } |
| 798 | else |
| 799 | { |
| 800 | error("opening this file is unsupported on this system"); |
| 801 | return NULL; |
| 802 | } |
| 803 | break; |
| 804 | case NSObjectFileImageFailure: |
| 805 | error("object file setup failure"); |
| 806 | return NULL; |
| 807 | case NSObjectFileImageArch: |
| 808 | error("no object for this architecture"); |
| 809 | return NULL; |
| 810 | case NSObjectFileImageFormat: |
| 811 | error("bad object file format"); |
| 812 | return NULL; |
| 813 | case NSObjectFileImageAccess: |
| 814 | error("can't read object file"); |
| 815 | return NULL; |
| 816 | default: |
| 817 | error("unknown error from NSCreateObjectFileImageFromFile()"); |
| 818 | return NULL; |
| 819 | } |
| 820 | dls = lookupStatus(sbuf); |
| 821 | if (!dls) |
| 822 | { |
| 823 | dls = allocStatus(); |
| 824 | } |
| 825 | if (!dls) |
| 826 | { |
| 827 | error("unable to allocate memory"); |
| 828 | return NULL; |
| 829 | } |
| 830 | // dls->lib = 0; |
| 831 | if (ofirc == NSObjectFileImageInappropriateFile) |
| 832 | { |
| 833 | if ((dls->lib = dyld_NSAddImage(path, NSADDIMAGE_OPTION_RETURN_ON_ERROR))) |
| 834 | { |
| 835 | debug("Dynamic lib loaded at %ld", dls->lib); |
| 836 | ofi = MAGIC_DYLIB_OFI; |
| 837 | dls->module = MAGIC_DYLIB_MOD; |
| 838 | ofirc = NSObjectFileImageSuccess; |
| 839 | /* Although it is possible with a bit of work to modify this so it works and |
| 840 | functions with RTLD_NOW, I don't deem it necessary at the moment */ |
| 841 | } |
| 842 | if (!(dls->module)) |
| 843 | { |
| 844 | NSLinkEditError(&ler, &lerno, &file, &errstr); |
| 845 | if (!errstr || (!SDL_strlen(errstr))) |
| 846 | error("Can't open this file type"); |
| 847 | else |
| 848 | error(errstr); |
| 849 | if ((dls->flags & DL_IN_LIST) == 0) |
| 850 | { |
| 851 | SDL_free(dls); |
| 852 | } |
| 853 | return NULL; |
| 854 | } |
| 855 | } |
| 856 | else |
| 857 | { |
| 858 | dls->module = NSLinkModule(ofi, path, |
| 859 | NSLINKMODULE_OPTION_RETURN_ON_ERROR | |
| 860 | NSLINKMODULE_OPTION_PRIVATE | |
| 861 | (isFlagSet(mode, RTLD_NOW) ? NSLINKMODULE_OPTION_BINDNOW : 0)); |
| 862 | NSDestroyObjectFileImage(ofi); |
| 863 | if (dls->module) |
| 864 | { |
| 865 | dls->lib = get_mach_header_from_NSModule(dls->module); |
| 866 | } |
| 867 | } |
| 868 | if (!dls->module) |
| 869 | { |
| 870 | NSLinkEditError(&ler, &lerno, &file, &errstr); |
| 871 | if ((dls->flags & DL_IN_LIST) == 0) |
| 872 | { |
| 873 | SDL_free(dls); |
| 874 | } |
| 875 | error(errstr); |
| 876 | return NULL; |
| 877 | } |
| 878 | |
| 879 | insertStatus(dls, sbuf); |
| 880 | dls = reference(dls, mode); |
| 881 | if ((init = dlsymIntern(dls, "__init", 0))) |
| 882 | { |
| 883 | debug("calling _init()"); |
| 884 | init(); |
| 885 | } |
| 886 | return dls; |
| 887 | } |
| 888 | |
| 889 | inline static void dlcompat_init_check(void) |
| 890 | { |
| 891 | static pthread_mutex_t l = PTHREAD_MUTEX_INITIALIZER; |
| 892 | static int init_done = 0; |
| 893 | |
| 894 | pthread_mutex_lock(&l); |
| 895 | if (!init_done) { |
| 896 | dlcompat_init_func(); |
| 897 | init_done = 1; |
| 898 | } |
| 899 | pthread_mutex_unlock(&l); |
| 900 | } |
| 901 | |
| 902 | static void dlcompat_init_func(void) |
| 903 | { |
| 904 | _dyld_func_lookup("__dyld_NSAddImage", (void **)&dyld_NSAddImage); |
| 905 | _dyld_func_lookup("__dyld_NSIsSymbolNameDefinedInImage", |
| 906 | (void **)&dyld_NSIsSymbolNameDefinedInImage); |
| 907 | _dyld_func_lookup("__dyld_NSLookupSymbolInImage", (void **)&dyld_NSLookupSymbolInImage); |
| 908 | if (pthread_mutex_init(&dlcompat_mutex, NULL)) |
| 909 | exit(1); |
| 910 | if (pthread_key_create(&dlerror_key, &dlerrorfree)) |
| 911 | exit(1); |
| 912 | } |
| 913 | |
| 914 | static void resetdlerror() |
| 915 | { |
| 916 | struct dlthread *tss; |
| 917 | tss = pthread_getspecific(dlerror_key); |
| 918 | tss->errset = 0; |
| 919 | } |
| 920 | |
| 921 | static void dlerrorfree(void *data) |
| 922 | { |
| 923 | SDL_free(data); |
| 924 | } |
| 925 | |
| 926 | /* We kind of want a recursive lock here, but meet a little trouble |
| 927 | * because they are not available pre OS X 10.2, so we fake it |
| 928 | * using thread specific storage to keep a lock count |
| 929 | */ |
| 930 | static inline void dolock(void) |
| 931 | { |
| 932 | int err = 0; |
| 933 | struct dlthread *tss; |
| 934 | dlcompat_init_check(); |
| 935 | tss = pthread_getspecific(dlerror_key); |
| 936 | if (!tss) |
| 937 | { |
| 938 | tss = SDL_malloc(sizeof(struct dlthread)); |
| 939 | tss->lockcnt = 0; |
| 940 | tss->errset = 0; |
| 941 | if (pthread_setspecific(dlerror_key, tss)) |
| 942 | { |
| 943 | fprintf(stderr,"dlcompat: pthread_setspecific failed\n"); |
| 944 | exit(1); |
| 945 | } |
| 946 | } |
| 947 | if (!tss->lockcnt) |
| 948 | err = pthread_mutex_lock(&dlcompat_mutex); |
| 949 | tss->lockcnt = tss->lockcnt +1; |
| 950 | if (err) |
| 951 | exit(err); |
| 952 | } |
| 953 | |
| 954 | static inline void dounlock(void) |
| 955 | { |
| 956 | int err = 0; |
| 957 | struct dlthread *tss; |
| 958 | tss = pthread_getspecific(dlerror_key); |
| 959 | tss->lockcnt = tss->lockcnt -1; |
| 960 | if (!tss->lockcnt) |
| 961 | err = pthread_mutex_unlock(&dlcompat_mutex); |
| 962 | if (err) |
| 963 | exit(err); |
| 964 | } |
| 965 | |
| 966 | static void *SDL_OSX_dlopen(const char *path, int mode) |
| 967 | { |
| 968 | const struct stat *sbuf; |
| 969 | struct dlstatus *dls; |
| 970 | const char *fullPath; |
| 971 | |
| 972 | dolock(); |
| 973 | resetdlerror(); |
| 974 | if (!path) |
| 975 | { |
| 976 | dls = &mainStatus; |
| 977 | goto dlopenok; |
| 978 | } |
| 979 | if (!(sbuf = findFile(path, &fullPath))) |
| 980 | { |
| 981 | error("file \"%s\" not found", path); |
| 982 | goto dlopenerror; |
| 983 | } |
| 984 | /* Now checks that it hasn't been closed already */ |
| 985 | if ((dls = lookupStatus(sbuf)) && (dls->refs > 0)) |
| 986 | { |
| 987 | /* debug("status found"); */ |
| 988 | dls = reference(dls, mode); |
| 989 | goto dlopenok; |
| 990 | } |
| 991 | #ifdef RTLD_NOLOAD |
| 992 | if (isFlagSet(mode, RTLD_NOLOAD)) |
| 993 | { |
| 994 | error("no existing handle and RTLD_NOLOAD specified"); |
| 995 | goto dlopenerror; |
| 996 | } |
| 997 | #endif |
| 998 | if (isFlagSet(mode, RTLD_LAZY) && isFlagSet(mode, RTLD_NOW)) |
| 999 | { |
| 1000 | error("how can I load something both RTLD_LAZY and RTLD_NOW?"); |
| 1001 | goto dlopenerror; |
| 1002 | } |
| 1003 | dls = loadModule(fullPath, sbuf, mode); |
| 1004 | |
| 1005 | dlopenok: |
| 1006 | dounlock(); |
| 1007 | return (void *)dls; |
| 1008 | dlopenerror: |
| 1009 | dounlock(); |
| 1010 | return NULL; |
| 1011 | } |
| 1012 | |
| 1013 | #if !FINK_BUILD |
| 1014 | static void *SDL_OSX_dlsym(void * dl_restrict handle, const char * dl_restrict symbol) |
| 1015 | { |
| 1016 | int sym_len = SDL_strlen(symbol); |
| 1017 | void *value = NULL; |
| 1018 | char *malloc_sym = NULL; |
| 1019 | dolock(); |
| 1020 | malloc_sym = SDL_malloc(sym_len + 2); |
| 1021 | if (malloc_sym) |
| 1022 | { |
| 1023 | SDL_snprintf(malloc_sym, sym_len+2, "_%s", symbol); |
| 1024 | value = dlsymIntern(handle, malloc_sym, 1); |
| 1025 | SDL_free(malloc_sym); |
| 1026 | } |
| 1027 | else |
| 1028 | { |
| 1029 | error("Unable to allocate memory"); |
| 1030 | goto dlsymerror; |
| 1031 | } |
| 1032 | dounlock(); |
| 1033 | return value; |
| 1034 | dlsymerror: |
| 1035 | dounlock(); |
| 1036 | return NULL; |
| 1037 | } |
| 1038 | #endif |
| 1039 | |
| 1040 | #if FINK_BUILD |
| 1041 | |
| 1042 | static void *dlsym_prepend_underscore(void *handle, const char *symbol) |
| 1043 | { |
| 1044 | void *answer; |
| 1045 | dolock(); |
| 1046 | answer = dlsym_prepend_underscore_intern(handle, symbol); |
| 1047 | dounlock(); |
| 1048 | return answer; |
| 1049 | } |
| 1050 | |
| 1051 | static void *dlsym_prepend_underscore_intern(void *handle, const char *symbol) |
| 1052 | { |
| 1053 | /* |
| 1054 | * A quick and easy way for porting packages which call dlsym(handle,"sym") |
| 1055 | * If the porter adds -Ddlsym=dlsym_prepend_underscore to the CFLAGS then |
| 1056 | * this function will be called, and will add the required underscore. |
| 1057 | * |
| 1058 | * Note that I haven't figured out yet which should be "standard", prepend |
| 1059 | * the underscore always, or not at all. These global functions need to go away |
| 1060 | * for opendarwin. |
| 1061 | */ |
| 1062 | int sym_len = SDL_strlen(symbol); |
| 1063 | void *value = NULL; |
| 1064 | char *malloc_sym = NULL; |
| 1065 | malloc_sym = SDL_malloc(sym_len + 2); |
| 1066 | if (malloc_sym) |
| 1067 | { |
| 1068 | SDL_snprintf(malloc_sym, sym_len+2, "_%s", symbol); |
| 1069 | value = dlsymIntern(handle, malloc_sym, 1); |
| 1070 | SDL_free(malloc_sym); |
| 1071 | } |
| 1072 | else |
| 1073 | { |
| 1074 | error("Unable to allocate memory"); |
| 1075 | } |
| 1076 | return value; |
| 1077 | } |
| 1078 | |
| 1079 | static void *dlsym_auto_underscore(void *handle, const char *symbol) |
| 1080 | { |
| 1081 | void *answer; |
| 1082 | dolock(); |
| 1083 | answer = dlsym_auto_underscore_intern(handle, symbol); |
| 1084 | dounlock(); |
| 1085 | return answer; |
| 1086 | |
| 1087 | } |
| 1088 | static void *dlsym_auto_underscore_intern(void *handle, const char *symbol) |
| 1089 | { |
| 1090 | struct dlstatus *dls = handle; |
| 1091 | void *addr = 0; |
| 1092 | addr = dlsymIntern(dls, symbol, 0); |
| 1093 | if (!addr) |
| 1094 | addr = dlsym_prepend_underscore_intern(handle, symbol); |
| 1095 | return addr; |
| 1096 | } |
| 1097 | |
| 1098 | |
| 1099 | static void *SDL_OSX_dlsym(void * dl_restrict handle, const char * dl_restrict symbol) |
| 1100 | { |
| 1101 | struct dlstatus *dls = handle; |
| 1102 | void *addr = 0; |
| 1103 | dolock(); |
| 1104 | addr = dlsymIntern(dls, symbol, 1); |
| 1105 | dounlock(); |
| 1106 | return addr; |
| 1107 | } |
| 1108 | #endif |
| 1109 | |
| 1110 | static int SDL_OSX_dlclose(void *handle) |
| 1111 | { |
| 1112 | struct dlstatus *dls = handle; |
| 1113 | dolock(); |
| 1114 | resetdlerror(); |
| 1115 | if (!isValidStatus(dls)) |
| 1116 | { |
| 1117 | goto dlcloseerror; |
| 1118 | } |
| 1119 | if (dls->module == MAGIC_DYLIB_MOD) |
| 1120 | { |
| 1121 | const char *name; |
| 1122 | if (!dls->lib) |
| 1123 | { |
| 1124 | name = "global context"; |
| 1125 | } |
| 1126 | else |
| 1127 | { |
| 1128 | name = get_lib_name(dls->lib); |
| 1129 | } |
| 1130 | warning("trying to close a .dylib!"); |
| 1131 | error("Not closing \"%s\" - dynamic libraries cannot be closed", name); |
| 1132 | goto dlcloseerror; |
| 1133 | } |
| 1134 | if (!dls->module) |
| 1135 | { |
| 1136 | error("module already closed"); |
| 1137 | goto dlcloseerror; |
| 1138 | } |
| 1139 | |
| 1140 | if (dls->refs == 1) |
| 1141 | { |
| 1142 | unsigned long options = 0; |
| 1143 | void (*fini) (void); |
| 1144 | if ((fini = dlsymIntern(dls, "__fini", 0))) |
| 1145 | { |
| 1146 | debug("calling _fini()"); |
| 1147 | fini(); |
| 1148 | } |
| 1149 | options |= NSUNLINKMODULE_OPTION_RESET_LAZY_REFERENCES; |
| 1150 | #ifdef RTLD_NODELETE |
| 1151 | if (isFlagSet(dls->mode, RTLD_NODELETE)) |
| 1152 | options |= NSUNLINKMODULE_OPTION_KEEP_MEMORY_MAPPED; |
| 1153 | #endif |
| 1154 | if (!NSUnLinkModule(dls->module, options)) |
| 1155 | { |
| 1156 | error("unable to unlink module"); |
| 1157 | goto dlcloseerror; |
| 1158 | } |
| 1159 | dls->refs--; |
| 1160 | dls->module = 0; |
| 1161 | /* Note: the dlstatus struct dls is neither removed from the list |
| 1162 | * nor is the memory it occupies freed. This shouldn't pose a |
| 1163 | * problem in mostly all cases, though. |
| 1164 | */ |
| 1165 | } |
| 1166 | dounlock(); |
| 1167 | return 0; |
| 1168 | dlcloseerror: |
| 1169 | dounlock(); |
| 1170 | return 1; |
| 1171 | } |
| 1172 | |
| 1173 | static const char *SDL_OSX_dlerror(void) |
| 1174 | { |
| 1175 | struct dlthread *tss; |
| 1176 | const char * err_str = NULL; |
| 1177 | dlcompat_init_check(); |
| 1178 | tss = pthread_getspecific(dlerror_key); |
| 1179 | if (tss != NULL && tss->errset != 0) { |
| 1180 | tss->errset = 0; |
| 1181 | err_str = tss->errstr; |
| 1182 | } |
| 1183 | return (err_str); |
| 1184 | } |
| 1185 | |
| 1186 | /* Given an address, return the mach_header for the image containing it |
| 1187 | * or zero if the given address is not contained in any loaded images. |
| 1188 | */ |
| 1189 | static const struct mach_header *image_for_address(const void *address) |
| 1190 | { |
| 1191 | unsigned long i; |
| 1192 | unsigned long j; |
| 1193 | unsigned long count = _dyld_image_count(); |
| 1194 | const struct mach_header *mh = 0; |
| 1195 | struct load_command *lc = 0; |
| 1196 | unsigned long addr = 0; |
| 1197 | for (i = 0; i < count; i++) |
| 1198 | { |
| 1199 | addr = (unsigned long)address - _dyld_get_image_vmaddr_slide(i); |
| 1200 | mh = _dyld_get_image_header(i); |
| 1201 | if (mh) |
| 1202 | { |
| 1203 | lc = (struct load_command *)((char *)mh + sizeof(struct mach_header)); |
| 1204 | for (j = 0; j < mh->ncmds; j++, lc = (struct load_command *)((char *)lc + lc->cmdsize)) |
| 1205 | { |
| 1206 | if (LC_SEGMENT == lc->cmd && |
| 1207 | addr >= ((struct segment_command *)lc)->vmaddr && |
| 1208 | addr < |
| 1209 | ((struct segment_command *)lc)->vmaddr + ((struct segment_command *)lc)->vmsize) |
| 1210 | { |
| 1211 | goto image_found; |
| 1212 | } |
| 1213 | } |
| 1214 | } |
| 1215 | mh = 0; |
| 1216 | } |
| 1217 | image_found: |
| 1218 | return mh; |
| 1219 | } |
| 1220 | |
| 1221 | #if 0 /* unused */ |
| 1222 | static int SDL_OSX_dladdr(const void * dl_restrict p, SDL_OSX_Dl_info * dl_restrict info) |
| 1223 | { |
| 1224 | /* |
| 1225 | FIXME: USe the routine image_for_address. |
| 1226 | */ |
| 1227 | unsigned long i; |
| 1228 | unsigned long j; |
| 1229 | unsigned long count = _dyld_image_count(); |
| 1230 | struct mach_header *mh = 0; |
| 1231 | struct load_command *lc = 0; |
| 1232 | unsigned long addr = NULL; |
| 1233 | unsigned long table_off = (unsigned long)0; |
| 1234 | int found = 0; |
| 1235 | if (!info) |
| 1236 | return 0; |
| 1237 | dolock(); |
| 1238 | resetdlerror(); |
| 1239 | info->dli_fname = 0; |
| 1240 | info->dli_fbase = 0; |
| 1241 | info->dli_sname = 0; |
| 1242 | info->dli_saddr = 0; |
| 1243 | /* Some of this was swiped from code posted by Douglas Davidson <ddavidso AT apple DOT com> |
| 1244 | * to darwin-development AT lists DOT apple DOT com and slightly modified |
| 1245 | */ |
| 1246 | for (i = 0; i < count; i++) |
| 1247 | { |
| 1248 | addr = (unsigned long)p - _dyld_get_image_vmaddr_slide(i); |
| 1249 | mh = _dyld_get_image_header(i); |
| 1250 | if (mh) |
| 1251 | { |
| 1252 | lc = (struct load_command *)((char *)mh + sizeof(struct mach_header)); |
| 1253 | for (j = 0; j < mh->ncmds; j++, lc = (struct load_command *)((char *)lc + lc->cmdsize)) |
| 1254 | { |
| 1255 | if (LC_SEGMENT == lc->cmd && |
| 1256 | addr >= ((struct segment_command *)lc)->vmaddr && |
| 1257 | addr < |
| 1258 | ((struct segment_command *)lc)->vmaddr + ((struct segment_command *)lc)->vmsize) |
| 1259 | { |
| 1260 | info->dli_fname = _dyld_get_image_name(i); |
| 1261 | info->dli_fbase = (void *)mh; |
| 1262 | found = 1; |
| 1263 | break; |
| 1264 | } |
| 1265 | } |
| 1266 | if (found) |
| 1267 | break; |
| 1268 | } |
| 1269 | } |
| 1270 | if (!found) |
| 1271 | { |
| 1272 | dounlock(); |
| 1273 | return 0; |
| 1274 | } |
| 1275 | lc = (struct load_command *)((char *)mh + sizeof(struct mach_header)); |
| 1276 | for (j = 0; j < mh->ncmds; j++, lc = (struct load_command *)((char *)lc + lc->cmdsize)) |
| 1277 | { |
| 1278 | if (LC_SEGMENT == lc->cmd) |
| 1279 | { |
| 1280 | if (!SDL_strcmp(((struct segment_command *)lc)->segname, "__LINKEDIT")) |
| 1281 | break; |
| 1282 | } |
| 1283 | } |
| 1284 | table_off = |
| 1285 | ((unsigned long)((struct segment_command *)lc)->vmaddr) - |
| 1286 | ((unsigned long)((struct segment_command *)lc)->fileoff) + _dyld_get_image_vmaddr_slide(i); |
| 1287 | debug("table off %x", table_off); |
| 1288 | |
| 1289 | lc = (struct load_command *)((char *)mh + sizeof(struct mach_header)); |
| 1290 | for (j = 0; j < mh->ncmds; j++, lc = (struct load_command *)((char *)lc + lc->cmdsize)) |
| 1291 | { |
| 1292 | if (LC_SYMTAB == lc->cmd) |
| 1293 | { |
| 1294 | |
| 1295 | struct nlist *symtable = (struct nlist *)(((struct symtab_command *)lc)->symoff + table_off); |
| 1296 | unsigned long numsyms = ((struct symtab_command *)lc)->nsyms; |
| 1297 | struct nlist *nearest = NULL; |
| 1298 | unsigned long diff = 0xffffffff; |
| 1299 | unsigned long strtable = (unsigned long)(((struct symtab_command *)lc)->stroff + table_off); |
| 1300 | debug("symtable %x", symtable); |
| 1301 | for (i = 0; i < numsyms; i++) |
| 1302 | { |
| 1303 | /* Ignore the following kinds of Symbols */ |
| 1304 | if ((!symtable->n_value) /* Undefined */ |
| 1305 | || (symtable->n_type >= N_PEXT) /* Debug symbol */ |
| 1306 | || (!(symtable->n_type & N_EXT)) /* Local Symbol */ |
| 1307 | ) |
| 1308 | { |
| 1309 | symtable++; |
| 1310 | continue; |
| 1311 | } |
| 1312 | if ((addr >= symtable->n_value) && (diff >= (symtable->n_value - addr))) |
| 1313 | { |
| 1314 | diff = (unsigned long)symtable->n_value - addr; |
| 1315 | nearest = symtable; |
| 1316 | } |
| 1317 | symtable++; |
| 1318 | } |
| 1319 | if (nearest) |
| 1320 | { |
| 1321 | info->dli_saddr = nearest->n_value + ((void *)p - addr); |
| 1322 | info->dli_sname = (char *)(strtable + nearest->n_un.n_strx); |
| 1323 | } |
| 1324 | } |
| 1325 | } |
| 1326 | dounlock(); |
| 1327 | return 1; |
| 1328 | } |
| 1329 | #endif |
| 1330 | |
| 1331 | /* |
| 1332 | * Implement the dlfunc() interface, which behaves exactly the same as |
| 1333 | * dlsym() except that it returns a function pointer instead of a data |
| 1334 | * pointer. This can be used by applications to avoid compiler warnings |
| 1335 | * about undefined behavior, and is intended as prior art for future |
| 1336 | * POSIX standardization. This function requires that all pointer types |
| 1337 | * have the same representation, which is true on all platforms FreeBSD |
| 1338 | * runs on, but is not guaranteed by the C standard. |
| 1339 | */ |
| 1340 | #if 0 |
| 1341 | static dlfunc_t SDL_OSX_dlfunc(void * dl_restrict handle, const char * dl_restrict symbol) |
| 1342 | { |
| 1343 | union |
| 1344 | { |
| 1345 | void *d; |
| 1346 | dlfunc_t f; |
| 1347 | } rv; |
| 1348 | int sym_len = SDL_strlen(symbol); |
| 1349 | char *malloc_sym = NULL; |
| 1350 | dolock(); |
| 1351 | malloc_sym = SDL_malloc(sym_len + 2); |
| 1352 | if (malloc_sym) |
| 1353 | { |
| 1354 | SDL_snprintf(malloc_sym, sym_len+2, "_%s", symbol); |
| 1355 | rv.d = dlsymIntern(handle, malloc_sym, 1); |
| 1356 | SDL_free(malloc_sym); |
| 1357 | } |
| 1358 | else |
| 1359 | { |
| 1360 | error("Unable to allocate memory"); |
| 1361 | goto dlfuncerror; |
| 1362 | } |
| 1363 | dounlock(); |
| 1364 | return rv.f; |
| 1365 | dlfuncerror: |
| 1366 | dounlock(); |
| 1367 | return NULL; |
| 1368 | } |
| 1369 | #endif |
| 1370 | |
| 1371 | |
| 1372 | |
| 1373 | /* dlcompat ends, here's the SDL interface... --ryan. */ |
| 1374 | |
| 1375 | |
| 1376 | /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */ |
| 1377 | /* System dependent library loading routines */ |
| 1378 | |
| 1379 | #include "SDL_loadso.h" |
| 1380 | |
| 1381 | void *SDL_LoadObject(const char *sofile) |
| 1382 | { |
| 1383 | void *handle = SDL_OSX_dlopen(sofile, RTLD_NOW); |
| 1384 | const char *loaderror = SDL_OSX_dlerror(); |
| 1385 | if ( handle == NULL ) { |
| 1386 | SDL_SetError("Failed loading %s: %s", sofile, loaderror); |
| 1387 | } |
| 1388 | return(handle); |
| 1389 | } |
| 1390 | |
| 1391 | void *SDL_LoadFunction(void *handle, const char *name) |
| 1392 | { |
| 1393 | void *symbol = SDL_OSX_dlsym(handle, name); |
| 1394 | if ( symbol == NULL ) { |
| 1395 | SDL_SetError("Failed loading %s: %s", name, SDL_OSX_dlerror()); |
| 1396 | } |
| 1397 | return(symbol); |
| 1398 | } |
| 1399 | |
| 1400 | void SDL_UnloadObject(void *handle) |
| 1401 | { |
| 1402 | if ( handle != NULL ) { |
| 1403 | SDL_OSX_dlclose(handle); |
| 1404 | } |
| 1405 | } |
| 1406 | |
| 1407 | #endif /* SDL_LOADSO_DLCOMPAT */ |