Emeric Vigier | 2f62582 | 2012-08-06 11:09:52 -0400 | [diff] [blame] | 1 | // Copyright (C) 1999-2005 Open Source Telecom Corporation. |
| 2 | // Copyright (C) 2006-2010 David Sugar, Tycho Softworks. |
| 3 | // |
| 4 | // This program is free software; you can redistribute it and/or modify |
| 5 | // it under the terms of the GNU General Public License as published by |
| 6 | // the Free Software Foundation; either version 2 of the License, or |
| 7 | // (at your option) any later version. |
| 8 | // |
| 9 | // This program is distributed in the hope that it will be useful, |
| 10 | // but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 12 | // GNU General Public License for more details. |
| 13 | // |
| 14 | // You should have received a copy of the GNU General Public License |
| 15 | // along with this program; if not, write to the Free Software |
| 16 | // Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
| 17 | // |
| 18 | // As a special exception, you may use this file as part of a free software |
| 19 | // library without restriction. Specifically, if other files instantiate |
| 20 | // templates or use macros or inline functions from this file, or you compile |
| 21 | // this file and link it with other files to produce an executable, this |
| 22 | // file does not by itself cause the resulting executable to be covered by |
| 23 | // the GNU General Public License. This exception does not however |
| 24 | // invalidate any other reasons why the executable file might be covered by |
| 25 | // the GNU General Public License. |
| 26 | // |
| 27 | // This exception applies only to the code released under the name GNU |
| 28 | // Common C++. If you copy code from other releases into a copy of GNU |
| 29 | // Common C++, as the General Public License permits, the exception does |
| 30 | // not apply to the code that you add in this way. To avoid misleading |
| 31 | // anyone as to the status of such modified files, you must delete |
| 32 | // this exception notice from them. |
| 33 | // |
| 34 | // If you write modifications of your own for GNU Common C++, it is your choice |
| 35 | // whether to permit this exception to apply to your modifications. |
| 36 | // If you do not wish that, delete this exception notice. |
| 37 | // |
| 38 | |
| 39 | #include <cc++/config.h> |
| 40 | #include <cc++/export.h> |
| 41 | #include <cc++/exception.h> |
| 42 | #include <cc++/slog.h> |
| 43 | #include <cc++/file.h> |
| 44 | #include "private.h" |
| 45 | |
| 46 | #ifdef CCXX_NAMESPACES |
| 47 | namespace ost { |
| 48 | #endif |
| 49 | |
| 50 | #ifdef HAVE_MODULES |
| 51 | DSO *DSO::first = NULL; |
| 52 | DSO *DSO::last = NULL; |
| 53 | Mutex DSO::mutex; |
| 54 | |
| 55 | #if defined(HAVE_DLFCN_H) |
| 56 | |
| 57 | extern "C" { |
| 58 | #include <dlfcn.h> |
| 59 | } |
| 60 | |
| 61 | #ifndef RTLD_GLOBAL |
| 62 | #define RTLD_GLOBAL 0 |
| 63 | #endif |
| 64 | |
| 65 | #endif // HAVE_DLFN_H |
| 66 | |
| 67 | void DSO::dynunload(void) |
| 68 | { |
| 69 | while(DSO::last) |
| 70 | delete DSO::last; |
| 71 | } |
| 72 | |
| 73 | DSO::~DSO() |
| 74 | { |
| 75 | #if defined(HAVE_MACH_DYLD) |
| 76 | NSSymbol sym; |
| 77 | void (*fini)(void); |
| 78 | #endif |
| 79 | MutexLock lock(mutex); |
| 80 | #if defined(WIN32) |
| 81 | if(hImage) |
| 82 | FreeLibrary(hImage); |
| 83 | #elif defined(HAVE_MACH_DYLD) |
| 84 | if(oModule == NULL) |
| 85 | return; |
| 86 | |
| 87 | sym = NSLookupSymbolInModule(oModule, "__fini"); |
| 88 | if(sym != NULL) { |
| 89 | fini = (void (*)(void))NSAddressOfSymbol(sym); |
| 90 | fini(); |
| 91 | } |
| 92 | |
| 93 | NSUnLinkModule(oModule, NSUNLINKMODULE_OPTION_NONE); |
| 94 | #elif defined(HAVE_SHL_LOAD) |
| 95 | if(image) |
| 96 | shl_unload(image); |
| 97 | #else |
| 98 | if(image) |
| 99 | dlclose(image); |
| 100 | #endif |
| 101 | |
| 102 | if(first == this && last == this) |
| 103 | first = last = NULL; |
| 104 | |
| 105 | if(!next && !prev) |
| 106 | return; |
| 107 | |
| 108 | if(prev) |
| 109 | prev->next = next; |
| 110 | |
| 111 | if(next) |
| 112 | next->prev = prev; |
| 113 | |
| 114 | if(first == this) |
| 115 | first = next; |
| 116 | if(last == this) |
| 117 | last = prev; |
| 118 | } |
| 119 | |
| 120 | void DSO::loader(const char *filename, bool flag) |
| 121 | { |
| 122 | #if defined(HAVE_MACH_DYLD) |
| 123 | NSObjectFileImage oImage; |
| 124 | NSSymbol sym = NULL; |
| 125 | void (*init)(void); |
| 126 | #endif |
| 127 | |
| 128 | id = strrchr(filename, '/'); |
| 129 | if(id) |
| 130 | ++id; |
| 131 | else |
| 132 | id = filename; |
| 133 | |
| 134 | next = prev = NULL; |
| 135 | |
| 136 | #if defined(WIN32) |
| 137 | hImage = LoadLibrary(filename); |
| 138 | err = "none"; |
| 139 | #elif defined(HAVE_MACH_DYLD) |
| 140 | err = "none"; |
| 141 | oModule = NULL; |
| 142 | |
| 143 | fprintf(stderr, "**** HERE %s\n", filename); |
| 144 | |
| 145 | switch(NSCreateObjectFileImageFromFile(filename, &oImage)) { |
| 146 | case NSObjectFileImageSuccess: |
| 147 | break; |
| 148 | default: |
| 149 | err = "unknown error"; |
| 150 | return; |
| 151 | } |
| 152 | if(flag) |
| 153 | oModule = NSLinkModule(oImage, filename, NSLINKMODULE_OPTION_BINDNOW | NSLINKMODULE_OPTION_RETURN_ON_ERROR); |
| 154 | else |
| 155 | oModule = NSLinkModule(oImage, filename, NSLINKMODULE_OPTION_RETURN_ON_ERROR); |
| 156 | NSDestroyObjectFileImage(oImage); |
| 157 | if(oModule != NULL) |
| 158 | sym = NSLookupSymbolInModule(oModule, "__init"); |
| 159 | if(sym) { |
| 160 | init = (void (*)(void))NSAddressOfSymbol(sym); |
| 161 | init(); |
| 162 | } |
| 163 | |
| 164 | #elif defined(HAVE_SHL_LOAD) |
| 165 | err = "none"; |
| 166 | if(flag) |
| 167 | image = shl_load(filename, BIND_IMMEDIATE, 0L); |
| 168 | else |
| 169 | image = shl_load(filename, BIND_DEFERRED, 0L); |
| 170 | #else |
| 171 | if(flag) |
| 172 | image = dlopen(filename, RTLD_NOW | RTLD_GLOBAL); |
| 173 | else |
| 174 | image = dlopen(filename, RTLD_LAZY | RTLD_GLOBAL); |
| 175 | |
| 176 | #endif |
| 177 | |
| 178 | #if defined(WIN32) |
| 179 | if(!hImage) { |
| 180 | err = "load failed"; |
| 181 | #elif defined(HAVE_MACH_DYLD) |
| 182 | if(oModule == NULL) { |
| 183 | err = "load failed"; |
| 184 | #elif defined(HAVE_SHL_LOAD) |
| 185 | if(!image) { |
| 186 | err = "load failed"; |
| 187 | #else |
| 188 | if(!image) { |
| 189 | err = dlerror(); |
| 190 | #endif |
| 191 | |
| 192 | // since generally failure to map or load a plugin is fatel in most |
| 193 | // cases, we should generally log the error to syslog as well as notify |
| 194 | // the upper level system of the failure through exception. |
| 195 | |
| 196 | slog.error() << "dso: " << id << ": " << err << std::endl; |
| 197 | |
| 198 | #ifdef CCXX_EXCEPTIONS |
| 199 | if(Thread::getException() == Thread::throwObject) |
| 200 | throw(this); |
| 201 | #ifdef COMMON_STD_EXCEPTION |
| 202 | else if(Thread::getException() == Thread::throwException) |
| 203 | throw(DSOException(String(id) + err)); |
| 204 | #endif |
| 205 | #endif |
| 206 | return; |
| 207 | } |
| 208 | |
| 209 | if(!last) { |
| 210 | last = first = this; |
| 211 | return; |
| 212 | } |
| 213 | |
| 214 | mutex.enterMutex(); |
| 215 | last->next = this; |
| 216 | prev = last; |
| 217 | last = this; |
| 218 | mutex.leaveMutex(); |
| 219 | } |
| 220 | |
| 221 | DSO *DSO::getObject(const char *id) |
| 222 | { |
| 223 | const char *chk = strrchr(id, '/'); |
| 224 | DSO *dso; |
| 225 | |
| 226 | if(chk) |
| 227 | ++chk; |
| 228 | else |
| 229 | chk = id; |
| 230 | |
| 231 | mutex.enterMutex(); |
| 232 | dso = first; |
| 233 | while(dso) { |
| 234 | if(!stricmp(dso->id, chk)) |
| 235 | break; |
| 236 | dso = dso->next; |
| 237 | } |
| 238 | mutex.leaveMutex(); |
| 239 | return dso; |
| 240 | } |
| 241 | |
| 242 | bool DSO::isValid(void) |
| 243 | { |
| 244 | #if defined(WIN32) |
| 245 | if(!hImage) |
| 246 | #elif defined(HAVE_MACH_DYLD) |
| 247 | if(oModule == NULL) |
| 248 | #else |
| 249 | if(!image) |
| 250 | #endif |
| 251 | return false; |
| 252 | |
| 253 | return true; |
| 254 | } |
| 255 | |
| 256 | void *DSO::operator[](const char *sym) |
| 257 | { |
| 258 | #if defined(HAVE_SHL_LOAD) |
| 259 | int value; |
| 260 | shl_t handle = (shl_t)image; |
| 261 | |
| 262 | if(shl_findsym(&handle, sym, 0, &value) == 0) |
| 263 | return (void *)value; |
| 264 | else |
| 265 | return NULL; |
| 266 | #elif defined(HAVE_MACH_DYLD) |
| 267 | NSSymbol oSymbol = NSLookupSymbolInModule(oModule, sym); |
| 268 | if(oSymbol) |
| 269 | return NSAddressOfSymbol(oSymbol); |
| 270 | else |
| 271 | return NULL; |
| 272 | #elif defined(WIN32) |
| 273 | void *addr = (void *)GetProcAddress(hImage, sym); |
| 274 | if(!addr) |
| 275 | err = "symbol missing"; |
| 276 | |
| 277 | return addr; |
| 278 | #else |
| 279 | return dlsym(image, (char *)sym); |
| 280 | #endif |
| 281 | } |
| 282 | |
| 283 | #endif |
| 284 | |
| 285 | |
| 286 | #ifdef HAVE_MACH_DYLD |
| 287 | static void MyLinkError(NSLinkEditErrors c, int errorNumber, const char *filename, const char *errstr) |
| 288 | { |
| 289 | slog.error() << "dyld: " << filename << ": " << errstr << std::endl; |
| 290 | } |
| 291 | |
| 292 | static void MyUndefined(const char *symname) |
| 293 | { |
| 294 | slog.error() << "dyld: undefined: " << symname << std::endl; |
| 295 | } |
| 296 | |
| 297 | static NSModule MyMultiple(NSSymbol s, NSModule oMod, NSModule nMod) |
| 298 | { |
| 299 | slog.error() << "dyld: multiply defined symbols" << std::endl; |
| 300 | } |
| 301 | |
| 302 | void DSO::setDebug(void) |
| 303 | { |
| 304 | static NSLinkEditErrorHandlers handlers = { |
| 305 | &MyUndefined, |
| 306 | &MyMultiple, |
| 307 | &MyLinkError}; |
| 308 | |
| 309 | NSInstallLinkEditErrorHandlers(&handlers); |
| 310 | } |
| 311 | |
| 312 | #else |
| 313 | |
| 314 | void DSO::setDebug(void) |
| 315 | { |
| 316 | } |
| 317 | |
| 318 | #endif |
| 319 | |
| 320 | #ifdef CCXX_NAMESPACES |
| 321 | } |
| 322 | #endif |
| 323 | |
| 324 | |
| 325 | /** EMACS ** |
| 326 | * Local variables: |
| 327 | * mode: c++ |
| 328 | * c-basic-offset: 4 |
| 329 | * End: |
| 330 | */ |