1 2 /* 3 Low-level routines for managing dynamic link libraries (DLLs). 4 */ 5 6 #include <../src/sys/dll/dlimpl.h> 7 8 /* XXX Should be done better !!!*/ 9 #if !defined(PETSC_HAVE_DYNAMIC_LIBRARIES) 10 #undef PETSC_HAVE_WINDOWS_H 11 #undef PETSC_HAVE_DLFCN_H 12 #endif 13 14 #if defined(PETSC_HAVE_WINDOWS_H) 15 #include <windows.h> 16 #elif defined(PETSC_HAVE_DLFCN_H) 17 #include <dlfcn.h> 18 #endif 19 20 #if defined(PETSC_HAVE_WINDOWS_H) 21 typedef HMODULE dlhandle_t; 22 typedef FARPROC dlsymbol_t; 23 #elif defined(PETSC_HAVE_DLFCN_H) 24 typedef void* dlhandle_t; 25 typedef void* dlsymbol_t; 26 #else 27 typedef void* dlhandle_t; 28 typedef void* dlsymbol_t; 29 #endif 30 31 #undef __FUNCT__ 32 #define __FUNCT__ "PetscDLOpen" 33 /*@C 34 PetscDLOpen - opens dynamic library 35 36 Not Collective 37 38 Input Parameters: 39 + name - name of library 40 - flags - options on how to open library 41 42 Output Parameter: 43 . handle 44 45 Level: developer 46 47 @*/ 48 PetscErrorCode PetscDLOpen(const char name[],int flags,PetscDLHandle *handle) 49 { 50 PETSC_UNUSED int dlflags1,dlflags2; /* There are some preprocessor paths where these variables are set, but not used */ 51 dlhandle_t dlhandle; 52 53 PetscFunctionBegin; 54 PetscValidCharPointer(name,1); 55 PetscValidPointer(handle,3); 56 57 dlflags1 = 0; 58 dlflags2 = 0; 59 dlhandle = (dlhandle_t) 0; 60 *handle = (PetscDLHandle) 0; 61 62 /* 63 --- LoadLibrary --- 64 */ 65 #if defined(PETSC_HAVE_WINDOWS_H) && defined(PETSC_HAVE_LOADLIBRARY) 66 dlhandle = LoadLibrary(name); 67 if (!dlhandle) { 68 #if defined(PETSC_HAVE_GETLASTERROR) 69 PetscErrorCode ierr; 70 DWORD erc; 71 char *buff = NULL; 72 erc = GetLastError(); 73 FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_IGNORE_INSERTS, 74 NULL,erc,MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),(LPSTR)&buff,0,NULL); 75 ierr = PetscError(PETSC_COMM_SELF,__LINE__,__FUNCT__,__FILE__,__SDIR__,PETSC_ERR_FILE_OPEN,PETSC_ERROR_REPEAT, 76 "Unable to open dynamic library:\n %s\n Error message from LoadLibrary() %s\n",name,buff); 77 LocalFree(buff); 78 PetscFunctionReturn(ierr); 79 #else 80 SETERRQ2(PETSC_COMM_SELF,PETSC_ERR_FILE_OPEN,"Unable to open dynamic library:\n %s\n Error message from LoadLibrary() %s\n",name,"unavailable"); 81 #endif 82 } 83 84 /* 85 --- dlopen --- 86 */ 87 #elif defined(PETSC_HAVE_DLFCN_H) && defined(PETSC_HAVE_DLOPEN) 88 /* 89 Mode indicates symbols required by symbol loaded with dlsym() 90 are only loaded when required (not all together) also indicates 91 symbols required can be contained in other libraries also opened 92 with dlopen() 93 */ 94 #if defined(PETSC_HAVE_RTLD_LAZY) 95 dlflags1 = RTLD_LAZY; 96 #endif 97 #if defined(PETSC_HAVE_RTLD_NOW) 98 if (flags & PETSC_DL_NOW) 99 dlflags1 = RTLD_NOW; 100 #endif 101 #if defined(PETSC_HAVE_RTLD_GLOBAL) 102 dlflags2 = RTLD_GLOBAL; 103 #endif 104 #if defined(PETSC_HAVE_RTLD_LOCAL) 105 if (flags & PETSC_DL_LOCAL) 106 dlflags2 = RTLD_LOCAL; 107 #endif 108 #if defined(PETSC_HAVE_DLERROR) 109 dlerror(); /* clear any previous error */ 110 #endif 111 dlhandle = dlopen(name,dlflags1|dlflags2); 112 if (!dlhandle) { 113 #if defined(PETSC_HAVE_DLERROR) 114 const char *errmsg = dlerror(); 115 #else 116 const char *errmsg = "unavailable"; 117 #endif 118 SETERRQ2(PETSC_COMM_SELF,PETSC_ERR_FILE_OPEN,"Unable to open dynamic library:\n %s\n Error message from dlopen() %s\n",name,errmsg); 119 } 120 121 /* 122 --- unimplemented --- 123 */ 124 #else 125 SETERRQ(PETSC_COMM_SELF,PETSC_ERR_SUP_SYS, "Cannot use dynamic libraries on this platform"); 126 #endif 127 128 *handle = (PetscDLHandle) dlhandle; 129 130 PetscFunctionReturn(0); 131 } 132 133 134 #undef __FUNCT__ 135 #define __FUNCT__ "PetscDLClose" 136 /*@C 137 PetscDLClose - closes a dynamic library 138 139 Not Collective 140 141 Input Parameter: 142 . handle - the handle for the library obtained with PetscDLOpen() 143 144 Level: developer 145 @*/ 146 PetscErrorCode PetscDLClose(PetscDLHandle *handle) 147 { 148 149 PetscFunctionBegin; 150 PetscValidPointer(handle,1); 151 152 /* 153 --- FreeLibrary --- 154 */ 155 #if defined(PETSC_HAVE_WINDOWS_H) 156 #if defined(PETSC_HAVE_FREELIBRARY) 157 if (FreeLibrary((dlhandle_t)*handle) == 0) { 158 #if defined(PETSC_HAVE_GETLASTERROR) 159 char *buff = NULL; 160 DWORD erc = GetLastError(); 161 FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_IGNORE_INSERTS, 162 NULL,erc,MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),(LPSTR)&buff,0,NULL); 163 PetscErrorPrintf("Error closing dynamic library:\n Error message from FreeLibrary() %s\n",buff); 164 LocalFree(buff); 165 #else 166 PetscErrorPrintf("Error closing dynamic library:\n Error message from FreeLibrary() %s\n","unavailable"); 167 #endif 168 } 169 #endif /* !PETSC_HAVE_FREELIBRARY */ 170 171 /* 172 --- dclose --- 173 */ 174 #elif defined(PETSC_HAVE_DLFCN_H) 175 #if defined(PETSC_HAVE_DLCLOSE) 176 #if defined(PETSC_HAVE_DLERROR) 177 dlerror(); /* clear any previous error */ 178 #endif 179 if (dlclose((dlhandle_t)*handle) < 0) { 180 #if defined(PETSC_HAVE_DLERROR) 181 const char *errmsg = dlerror(); 182 #else 183 const char *errmsg = "unavailable"; 184 #endif 185 PetscErrorPrintf("Error closing dynamic library:\n Error message from dlclose() %s\n", errmsg); 186 } 187 #endif /* !PETSC_HAVE_DLCLOSE */ 188 189 /* 190 --- unimplemented --- 191 */ 192 #else 193 SETERRQ(PETSC_COMM_SELF,PETSC_ERR_SUP_SYS, "Cannot use dynamic libraries on this platform"); 194 #endif 195 196 *handle = PETSC_NULL; 197 198 PetscFunctionReturn(0); 199 } 200 201 #undef __FUNCT__ 202 #define __FUNCT__ "PetscDLSym" 203 /*@C 204 PetscDLSym - finds a symbol in a dynamic library 205 206 Not Collective 207 208 Input Parameters: 209 + handle - obtained with PetscDLOpen() or PETSC_NULL 210 - symbol - name of symbol 211 212 Output Parameter: 213 . value - pointer to the function 214 215 Level: developer 216 217 Notes: 218 If handle is PETSC_NULL, the symbol is looked for in the main executable's dynamic symbol table. 219 In order to be dynamically loadable, the symbol has to be exported as such. On many UNIX-like 220 systems this requires platform-specific linker flags. 221 222 @*/ 223 PetscErrorCode PetscDLSym(PetscDLHandle handle,const char symbol[],void **value) 224 { 225 PETSC_UNUSED dlhandle_t dlhandle; 226 dlsymbol_t dlsymbol; 227 228 PetscFunctionBegin; 229 PetscValidCharPointer(symbol,2); 230 PetscValidPointer(value,3); 231 232 dlhandle = (dlhandle_t) 0; 233 dlsymbol = (dlsymbol_t) 0; 234 235 *value = (void *) 0; 236 237 /* 238 --- GetProcAddress --- 239 */ 240 #if defined(PETSC_HAVE_WINDOWS_H) 241 #if defined(PETSC_HAVE_GETPROCADDRESS) 242 if (handle) 243 dlhandle = (dlhandle_t) handle; 244 else 245 dlhandle = (dlhandle_t) GetCurrentProcess(); 246 dlsymbol = (dlsymbol_t) GetProcAddress(dlhandle,symbol); 247 #if defined(PETSC_HAVE_SETLASTERROR) 248 SetLastError((DWORD)0); /* clear any previous error */ 249 #endif 250 #endif /* !PETSC_HAVE_GETPROCADDRESS */ 251 252 /* 253 --- dlsym --- 254 */ 255 #elif defined(PETSC_HAVE_DLFCN_H) 256 #if defined(PETSC_HAVE_DLSYM) 257 if (handle) { 258 dlhandle = (dlhandle_t) handle; 259 } else { 260 261 262 #if defined(PETSC_HAVE_DLOPEN) && defined(PETSC_HAVE_DYNAMIC_LIBRARIES) 263 /* Attempt to retrieve the main executable's dlhandle. */ 264 { int dlflags1 = 0, dlflags2 = 0; 265 #if defined(PETSC_HAVE_RTLD_LAZY) 266 dlflags1 = RTLD_LAZY; 267 #endif 268 if (!dlflags1) { 269 #if defined(PETSC_HAVE_RTLD_NOW) 270 dlflags1 = RTLD_NOW; 271 #endif 272 } 273 #if defined(PETSC_HAVE_RTLD_LOCAL) 274 dlflags2 = RTLD_LOCAL; 275 #endif 276 if (!dlflags2) { 277 #if defined(PETSC_HAVE_RTLD_GLOBAL) 278 dlflags2 = RTLD_GLOBAL; 279 #endif 280 } 281 #if defined(PETSC_HAVE_DLERROR) 282 if (!(PETSC_RUNNING_ON_VALGRIND)) { 283 dlerror(); /* clear any previous error; valgrind does not like this */ 284 } 285 #endif 286 /* Attempt to open the main executable as a dynamic library. */ 287 #if defined(PETSC_HAVE_RTDL_DEFAULT) 288 dlhandle = RTLD_DEFAULT; 289 #else 290 dlhandle = dlopen(0, dlflags1|dlflags2); 291 #if defined(PETSC_HAVE_DLERROR) 292 { const char *e = (const char*) dlerror(); 293 if (e) SETERRQ1(PETSC_COMM_SELF, PETSC_ERR_ARG_WRONG, "Error opening main executable as a dynamic library:\n Error message from dlopen(): '%s'\n", e); 294 } 295 #endif 296 #endif 297 } 298 #endif 299 #endif /* PETSC_HAVE_DLOPEN && PETSC_USE_DYNAMIC_LIBRARIES */ 300 } 301 #if defined(PETSC_HAVE_DLERROR) 302 dlerror(); /* clear any previous error */ 303 #endif 304 dlsymbol = (dlsymbol_t) dlsym(dlhandle,symbol); 305 /* 306 --- unimplemented --- 307 */ 308 #else 309 SETERRQ(PETSC_COMM_SELF,PETSC_ERR_SUP_SYS, "Cannot use dynamic libraries on this platform"); 310 #endif 311 312 *value = *((void**)&dlsymbol); 313 314 PetscFunctionReturn(0); 315 } 316