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1 | /* ltdl.h -- generic dlopen functions |
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2 | Copyright (C) 1998-2001, 2003, 2004, 2007 Free Software Foundation, Inc. |
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3 | Originally by Thomas Tanner <tanner@ffii.org> |
| 4 | This file is part of GNU Libtool. |
| 5 | |
| 6 | This library is free software; you can redistribute it and/or |
| 7 | modify it under the terms of the GNU Lesser General Public |
| 8 | License as published by the Free Software Foundation; either |
| 9 | version 2 of the License, or (at your option) any later version. |
| 10 | |
| 11 | As a special exception to the GNU Lesser General Public License, |
| 12 | if you distribute this file as part of a program or library that |
| 13 | is built using GNU libtool, you may include it under the same |
| 14 | distribution terms that you use for the rest of that program. |
| 15 | |
| 16 | This library is distributed in the hope that it will be useful, |
| 17 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 18 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 19 | Lesser General Public License for more details. |
| 20 | |
| 21 | You should have received a copy of the GNU Lesser General Public |
| 22 | License along with this library; if not, write to the Free |
| 23 | Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
| 24 | 02110-1301 USA |
| 25 | */ |
| 26 | |
| 27 | /* Only include this header file once. */ |
| 28 | #ifndef LTDL_H |
| 29 | #define LTDL_H 1 |
| 30 | |
| 31 | #include <sys/types.h> /* for size_t declaration */ |
| 32 | |
| 33 | \f |
| 34 | /* --- MACROS FOR PORTABILITY --- */ |
| 35 | |
| 36 | |
| 37 | /* Saves on those hard to debug '\0' typos.... */ |
| 38 | #define LT_EOS_CHAR '\0' |
| 39 | |
| 40 | /* LTDL_BEGIN_C_DECLS should be used at the beginning of your declarations, |
| 41 | so that C++ compilers don't mangle their names. Use LTDL_END_C_DECLS at |
| 42 | the end of C declarations. */ |
| 43 | #ifdef __cplusplus |
| 44 | # define LT_BEGIN_C_DECLS extern "C" { |
| 45 | # define LT_END_C_DECLS } |
| 46 | #else |
| 47 | # define LT_BEGIN_C_DECLS /* empty */ |
| 48 | # define LT_END_C_DECLS /* empty */ |
| 49 | #endif |
| 50 | |
| 51 | LT_BEGIN_C_DECLS |
| 52 | |
| 53 | |
| 54 | /* LT_PARAMS is a macro used to wrap function prototypes, so that compilers |
| 55 | that don't understand ANSI C prototypes still work, and ANSI C |
| 56 | compilers can issue warnings about type mismatches. */ |
| 57 | #if defined (__STDC__) || defined (_AIX) || (defined (__mips) && defined (_SYSTYPE_SVR4)) || defined(WIN32) || defined(__cplusplus) |
| 58 | # define LT_PARAMS(protos) protos |
| 59 | # define lt_ptr void* |
| 60 | #else |
| 61 | # define LT_PARAMS(protos) () |
| 62 | # define lt_ptr char* |
| 63 | #endif |
| 64 | |
| 65 | /* LT_STMT_START/END are used to create macros which expand to a |
| 66 | a single compound statement in a portable way. */ |
| 67 | #if defined (__GNUC__) && !defined (__STRICT_ANSI__) && !defined (__cplusplus) |
| 68 | # define LT_STMT_START (void)( |
| 69 | # define LT_STMT_END ) |
| 70 | #else |
| 71 | # if (defined (sun) || defined (__sun__)) |
| 72 | # define LT_STMT_START if (1) |
| 73 | # define LT_STMT_END else (void)0 |
| 74 | # else |
| 75 | # define LT_STMT_START do |
| 76 | # define LT_STMT_END while (0) |
| 77 | # endif |
| 78 | #endif |
| 79 | |
| 80 | /* LT_CONC creates a new concatenated symbol for the compiler |
| 81 | in a portable way. */ |
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82 | #if defined(__STDC__) || defined(__cplusplus) || defined(_MSC_VER) || defined(_AIX) |
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83 | # define LT_CONC(s,t) s##t |
| 84 | #else |
| 85 | # define LT_CONC(s,t) s/**/t |
| 86 | #endif |
| 87 | |
| 88 | /* LT_STRLEN can be used safely on NULL pointers. */ |
| 89 | #define LT_STRLEN(s) (((s) && (s)[0]) ? strlen (s) : 0) |
| 90 | |
| 91 | |
| 92 | \f |
| 93 | /* --- WINDOWS SUPPORT --- */ |
| 94 | |
| 95 | |
| 96 | /* Canonicalise Windows and Cygwin recognition macros. */ |
| 97 | #ifdef __CYGWIN32__ |
| 98 | # ifndef __CYGWIN__ |
| 99 | # define __CYGWIN__ __CYGWIN32__ |
| 100 | # endif |
| 101 | #endif |
| 102 | #if defined(_WIN32) || defined(WIN32) |
| 103 | # ifndef __WINDOWS__ |
| 104 | # ifdef _WIN32 |
| 105 | # define __WINDOWS__ _WIN32 |
| 106 | # else |
| 107 | # ifdef WIN32 |
| 108 | # define __WINDOWS__ WIN32 |
| 109 | # endif |
| 110 | # endif |
| 111 | # endif |
| 112 | #endif |
| 113 | |
| 114 | |
| 115 | #ifdef __WINDOWS__ |
| 116 | # ifndef __CYGWIN__ |
| 117 | /* LT_DIRSEP_CHAR is accepted *in addition* to '/' as a directory |
| 118 | separator when it is set. */ |
| 119 | # define LT_DIRSEP_CHAR '\\' |
| 120 | # define LT_PATHSEP_CHAR ';' |
| 121 | # endif |
| 122 | #endif |
| 123 | #ifndef LT_PATHSEP_CHAR |
| 124 | # define LT_PATHSEP_CHAR ':' |
| 125 | #endif |
| 126 | |
| 127 | /* DLL building support on win32 hosts; mostly to workaround their |
| 128 | ridiculous implementation of data symbol exporting. */ |
| 129 | #ifndef LT_SCOPE |
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130 | # if defined(__WINDOWS__) || defined(__CYGWIN__) |
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131 | # ifdef DLL_EXPORT /* defined by libtool (if required) */ |
| 132 | # define LT_SCOPE __declspec(dllexport) |
| 133 | # endif |
| 134 | # ifdef LIBLTDL_DLL_IMPORT /* define if linking with this dll */ |
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135 | /* note: cygwin/mingw compilers can rely instead on auto-import */ |
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136 | # define LT_SCOPE extern __declspec(dllimport) |
| 137 | # endif |
| 138 | # endif |
| 139 | # ifndef LT_SCOPE /* static linking or !__WINDOWS__ */ |
| 140 | # define LT_SCOPE extern |
| 141 | # endif |
| 142 | #endif |
| 143 | |
| 144 | |
| 145 | #if defined(_MSC_VER) /* Visual Studio */ |
| 146 | # define R_OK 4 |
| 147 | #endif |
| 148 | |
| 149 | |
| 150 | \f |
| 151 | /* --- DYNAMIC MODULE LOADING API --- */ |
| 152 | |
| 153 | |
| 154 | typedef struct lt_dlhandle_struct *lt_dlhandle; /* A loaded module. */ |
| 155 | |
| 156 | /* Initialisation and finalisation functions for libltdl. */ |
| 157 | LT_SCOPE int lt_dlinit LT_PARAMS((void)); |
| 158 | LT_SCOPE int lt_dlexit LT_PARAMS((void)); |
| 159 | |
| 160 | /* Module search path manipulation. */ |
| 161 | LT_SCOPE int lt_dladdsearchdir LT_PARAMS((const char *search_dir)); |
| 162 | LT_SCOPE int lt_dlinsertsearchdir LT_PARAMS((const char *before, |
| 163 | const char *search_dir)); |
| 164 | LT_SCOPE int lt_dlsetsearchpath LT_PARAMS((const char *search_path)); |
| 165 | LT_SCOPE const char *lt_dlgetsearchpath LT_PARAMS((void)); |
| 166 | LT_SCOPE int lt_dlforeachfile LT_PARAMS(( |
| 167 | const char *search_path, |
| 168 | int (*func) (const char *filename, lt_ptr data), |
| 169 | lt_ptr data)); |
| 170 | |
| 171 | /* Portable libltdl versions of the system dlopen() API. */ |
| 172 | LT_SCOPE lt_dlhandle lt_dlopen LT_PARAMS((const char *filename)); |
| 173 | LT_SCOPE lt_dlhandle lt_dlopenext LT_PARAMS((const char *filename)); |
| 174 | LT_SCOPE lt_ptr lt_dlsym LT_PARAMS((lt_dlhandle handle, |
| 175 | const char *name)); |
| 176 | LT_SCOPE const char *lt_dlerror LT_PARAMS((void)); |
| 177 | LT_SCOPE int lt_dlclose LT_PARAMS((lt_dlhandle handle)); |
| 178 | |
| 179 | /* Module residency management. */ |
| 180 | LT_SCOPE int lt_dlmakeresident LT_PARAMS((lt_dlhandle handle)); |
| 181 | LT_SCOPE int lt_dlisresident LT_PARAMS((lt_dlhandle handle)); |
| 182 | |
| 183 | |
| 184 | |
| 185 | \f |
| 186 | /* --- MUTEX LOCKING --- */ |
| 187 | |
| 188 | |
| 189 | typedef void lt_dlmutex_lock LT_PARAMS((void)); |
| 190 | typedef void lt_dlmutex_unlock LT_PARAMS((void)); |
| 191 | typedef void lt_dlmutex_seterror LT_PARAMS((const char *errmsg)); |
| 192 | typedef const char *lt_dlmutex_geterror LT_PARAMS((void)); |
| 193 | |
| 194 | LT_SCOPE int lt_dlmutex_register LT_PARAMS((lt_dlmutex_lock *lock, |
| 195 | lt_dlmutex_unlock *unlock, |
| 196 | lt_dlmutex_seterror *seterror, |
| 197 | lt_dlmutex_geterror *geterror)); |
| 198 | |
| 199 | |
| 200 | |
| 201 | \f |
| 202 | /* --- MEMORY HANDLING --- */ |
| 203 | |
| 204 | |
| 205 | /* By default, the realloc function pointer is set to our internal |
| 206 | realloc implementation which iself uses lt_dlmalloc and lt_dlfree. |
| 207 | libltdl relies on a featureful realloc, but if you are sure yours |
| 208 | has the right semantics then you can assign it directly. Generally, |
| 209 | it is safe to assign just a malloc() and a free() function. */ |
| 210 | LT_SCOPE lt_ptr (*lt_dlmalloc) LT_PARAMS((size_t size)); |
| 211 | LT_SCOPE lt_ptr (*lt_dlrealloc) LT_PARAMS((lt_ptr ptr, size_t size)); |
| 212 | LT_SCOPE void (*lt_dlfree) LT_PARAMS((lt_ptr ptr)); |
| 213 | |
| 214 | |
| 215 | |
| 216 | \f |
| 217 | /* --- PRELOADED MODULE SUPPORT --- */ |
| 218 | |
| 219 | |
| 220 | /* A preopened symbol. Arrays of this type comprise the exported |
| 221 | symbols for a dlpreopened module. */ |
| 222 | typedef struct { |
| 223 | const char *name; |
| 224 | lt_ptr address; |
| 225 | } lt_dlsymlist; |
| 226 | |
| 227 | LT_SCOPE int lt_dlpreload LT_PARAMS((const lt_dlsymlist *preloaded)); |
| 228 | LT_SCOPE int lt_dlpreload_default |
| 229 | LT_PARAMS((const lt_dlsymlist *preloaded)); |
| 230 | |
| 231 | #define LTDL_SET_PRELOADED_SYMBOLS() LT_STMT_START{ \ |
| 232 | extern const lt_dlsymlist lt_preloaded_symbols[]; \ |
| 233 | lt_dlpreload_default(lt_preloaded_symbols); \ |
| 234 | }LT_STMT_END |
| 235 | |
| 236 | |
| 237 | |
| 238 | \f |
| 239 | /* --- MODULE INFORMATION --- */ |
| 240 | |
| 241 | |
| 242 | /* Read only information pertaining to a loaded module. */ |
| 243 | typedef struct { |
| 244 | char *filename; /* file name */ |
| 245 | char *name; /* module name */ |
| 246 | int ref_count; /* number of times lt_dlopened minus |
| 247 | number of times lt_dlclosed. */ |
| 248 | } lt_dlinfo; |
| 249 | |
| 250 | LT_SCOPE const lt_dlinfo *lt_dlgetinfo LT_PARAMS((lt_dlhandle handle)); |
| 251 | LT_SCOPE lt_dlhandle lt_dlhandle_next LT_PARAMS((lt_dlhandle place)); |
| 252 | LT_SCOPE int lt_dlforeach LT_PARAMS(( |
| 253 | int (*func) (lt_dlhandle handle, lt_ptr data), |
| 254 | lt_ptr data)); |
| 255 | |
| 256 | /* Associating user data with loaded modules. */ |
| 257 | typedef unsigned lt_dlcaller_id; |
| 258 | |
| 259 | LT_SCOPE lt_dlcaller_id lt_dlcaller_register LT_PARAMS((void)); |
| 260 | LT_SCOPE lt_ptr lt_dlcaller_set_data LT_PARAMS((lt_dlcaller_id key, |
| 261 | lt_dlhandle handle, |
| 262 | lt_ptr data)); |
| 263 | LT_SCOPE lt_ptr lt_dlcaller_get_data LT_PARAMS((lt_dlcaller_id key, |
| 264 | lt_dlhandle handle)); |
| 265 | |
| 266 | |
| 267 | \f |
| 268 | /* --- USER MODULE LOADER API --- */ |
| 269 | |
| 270 | |
| 271 | typedef struct lt_dlloader lt_dlloader; |
| 272 | typedef lt_ptr lt_user_data; |
| 273 | typedef lt_ptr lt_module; |
| 274 | |
| 275 | /* Function pointer types for creating user defined module loaders. */ |
| 276 | typedef lt_module lt_module_open LT_PARAMS((lt_user_data loader_data, |
| 277 | const char *filename)); |
| 278 | typedef int lt_module_close LT_PARAMS((lt_user_data loader_data, |
| 279 | lt_module handle)); |
| 280 | typedef lt_ptr lt_find_sym LT_PARAMS((lt_user_data loader_data, |
| 281 | lt_module handle, |
| 282 | const char *symbol)); |
| 283 | typedef int lt_dlloader_exit LT_PARAMS((lt_user_data loader_data)); |
| 284 | |
| 285 | struct lt_user_dlloader { |
| 286 | const char *sym_prefix; |
| 287 | lt_module_open *module_open; |
| 288 | lt_module_close *module_close; |
| 289 | lt_find_sym *find_sym; |
| 290 | lt_dlloader_exit *dlloader_exit; |
| 291 | lt_user_data dlloader_data; |
| 292 | }; |
| 293 | |
| 294 | LT_SCOPE lt_dlloader *lt_dlloader_next LT_PARAMS((lt_dlloader *place)); |
| 295 | LT_SCOPE lt_dlloader *lt_dlloader_find LT_PARAMS(( |
| 296 | const char *loader_name)); |
| 297 | LT_SCOPE const char *lt_dlloader_name LT_PARAMS((lt_dlloader *place)); |
| 298 | LT_SCOPE lt_user_data *lt_dlloader_data LT_PARAMS((lt_dlloader *place)); |
| 299 | LT_SCOPE int lt_dlloader_add LT_PARAMS((lt_dlloader *place, |
| 300 | const struct lt_user_dlloader *dlloader, |
| 301 | const char *loader_name)); |
| 302 | LT_SCOPE int lt_dlloader_remove LT_PARAMS(( |
| 303 | const char *loader_name)); |
| 304 | |
| 305 | |
| 306 | \f |
| 307 | /* --- ERROR MESSAGE HANDLING --- */ |
| 308 | |
| 309 | |
| 310 | /* Defining error strings alongside their symbolic names in a macro in |
| 311 | this way allows us to expand the macro in different contexts with |
| 312 | confidence that the enumeration of symbolic names will map correctly |
| 313 | onto the table of error strings. */ |
| 314 | #define lt_dlerror_table \ |
| 315 | LT_ERROR(UNKNOWN, "unknown error") \ |
| 316 | LT_ERROR(DLOPEN_NOT_SUPPORTED, "dlopen support not available") \ |
| 317 | LT_ERROR(INVALID_LOADER, "invalid loader") \ |
| 318 | LT_ERROR(INIT_LOADER, "loader initialization failed") \ |
| 319 | LT_ERROR(REMOVE_LOADER, "loader removal failed") \ |
| 320 | LT_ERROR(FILE_NOT_FOUND, "file not found") \ |
| 321 | LT_ERROR(DEPLIB_NOT_FOUND, "dependency library not found") \ |
| 322 | LT_ERROR(NO_SYMBOLS, "no symbols defined") \ |
| 323 | LT_ERROR(CANNOT_OPEN, "can't open the module") \ |
| 324 | LT_ERROR(CANNOT_CLOSE, "can't close the module") \ |
| 325 | LT_ERROR(SYMBOL_NOT_FOUND, "symbol not found") \ |
| 326 | LT_ERROR(NO_MEMORY, "not enough memory") \ |
| 327 | LT_ERROR(INVALID_HANDLE, "invalid module handle") \ |
| 328 | LT_ERROR(BUFFER_OVERFLOW, "internal buffer overflow") \ |
| 329 | LT_ERROR(INVALID_ERRORCODE, "invalid errorcode") \ |
| 330 | LT_ERROR(SHUTDOWN, "library already shutdown") \ |
| 331 | LT_ERROR(CLOSE_RESIDENT_MODULE, "can't close resident module") \ |
| 332 | LT_ERROR(INVALID_MUTEX_ARGS, "invalid mutex handler registration") \ |
| 333 | LT_ERROR(INVALID_POSITION, "invalid search path insert position") |
| 334 | |
| 335 | /* Enumerate the symbolic error names. */ |
| 336 | enum { |
| 337 | #define LT_ERROR(name, diagnostic) LT_CONC(LT_ERROR_, name), |
| 338 | lt_dlerror_table |
| 339 | #undef LT_ERROR |
| 340 | |
| 341 | LT_ERROR_MAX |
| 342 | }; |
| 343 | |
| 344 | /* These functions are only useful from inside custom module loaders. */ |
| 345 | LT_SCOPE int lt_dladderror LT_PARAMS((const char *diagnostic)); |
| 346 | LT_SCOPE int lt_dlseterror LT_PARAMS((int errorcode)); |
| 347 | |
| 348 | |
| 349 | |
| 350 | \f |
| 351 | /* --- SOURCE COMPATIBILITY WITH OLD LIBLTDL --- */ |
| 352 | |
| 353 | |
| 354 | #ifdef LT_NON_POSIX_NAMESPACE |
| 355 | # define lt_ptr_t lt_ptr |
| 356 | # define lt_module_t lt_module |
| 357 | # define lt_module_open_t lt_module_open |
| 358 | # define lt_module_close_t lt_module_close |
| 359 | # define lt_find_sym_t lt_find_sym |
| 360 | # define lt_dlloader_exit_t lt_dlloader_exit |
| 361 | # define lt_dlloader_t lt_dlloader |
| 362 | # define lt_dlloader_data_t lt_user_data |
| 363 | #endif |
| 364 | |
| 365 | LT_END_C_DECLS |
| 366 | |
| 367 | #endif /* !LTDL_H */ |
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