1 2 #include <petscsys.h> /*I "petscsys.h" I*/ 3 4 /* ---------------------------------------------------------------- */ 5 6 #if !defined(PETSC_PYTHON_EXE) 7 #define PETSC_PYTHON_EXE "python" 8 #endif 9 10 #undef __FUNCT__ 11 #define __FUNCT__ "PetscPythonFindExecutable" 12 static PetscErrorCode PetscPythonFindExecutable(char pythonexe[PETSC_MAX_PATH_LEN]) 13 { 14 PetscBool flag; 15 PetscErrorCode ierr; 16 PetscFunctionBegin; 17 /* get the path for the Python interpreter executable */ 18 ierr = PetscStrncpy(pythonexe,PETSC_PYTHON_EXE,PETSC_MAX_PATH_LEN);CHKERRQ(ierr); 19 ierr = PetscOptionsGetString(PETSC_NULL,"-python",pythonexe,PETSC_MAX_PATH_LEN,&flag);CHKERRQ(ierr); 20 if (!flag || pythonexe[0]==0) { 21 ierr = PetscStrncpy(pythonexe,PETSC_PYTHON_EXE,PETSC_MAX_PATH_LEN);CHKERRQ(ierr); 22 } 23 PetscFunctionReturn(0); 24 } 25 26 #undef __FUNCT__ 27 #define __FUNCT__ "PetscPythonFindLibrary" 28 static PetscErrorCode PetscPythonFindLibrary(char pythonexe[PETSC_MAX_PATH_LEN], 29 char pythonlib[PETSC_MAX_PATH_LEN]) 30 { 31 const char cmdline[] = "-c 'import sys; print(sys.exec_prefix); print(sys.version[:3])'"; 32 char command[PETSC_MAX_PATH_LEN+1+sizeof(cmdline)+1]; 33 char prefix[PETSC_MAX_PATH_LEN],version[8],sep[2]={PETSC_DIR_SEPARATOR, 0},*eol; 34 FILE* fp = NULL; 35 char path[PETSC_MAX_PATH_LEN+1]; 36 PetscBool found = PETSC_FALSE; 37 PetscErrorCode ierr; 38 PetscFunctionBegin; 39 40 #if defined(PETSC_PYTHON_LIB) 41 ierr = PetscStrcpy(pythonlib,PETSC_PYTHON_LIB);CHKERRQ(ierr); 42 PetscFunctionReturn(0); 43 #endif 44 45 /* call Python to find out the name of the Python dynamic library */ 46 ierr = PetscStrncpy(command,pythonexe,PETSC_MAX_PATH_LEN);CHKERRQ(ierr); 47 ierr = PetscStrcat(command," ");CHKERRQ(ierr); 48 ierr = PetscStrcat(command,cmdline);CHKERRQ(ierr); 49 #if defined(PETSC_HAVE_POPEN) 50 ierr = PetscPOpen(PETSC_COMM_SELF,PETSC_NULL,command,"r",&fp);CHKERRQ(ierr); 51 if (!fgets(prefix,sizeof(prefix),fp)) 52 { SETERRQ1(PETSC_COMM_SELF,PETSC_ERR_PLIB,"Python: bad output from executable: %s",pythonexe); } 53 if (!fgets(version,sizeof(version),fp)) 54 { SETERRQ1(PETSC_COMM_SELF,PETSC_ERR_PLIB,"Python: bad output from executable: %s",pythonexe); } 55 ierr = PetscPClose(PETSC_COMM_SELF,fp);CHKERRQ(ierr); 56 #else 57 SETERRQ(PETSC_COMM_SELF,1,"Python: Aborted due to missing popen()"); 58 #endif 59 /* remove newlines */ 60 ierr = PetscStrchr(prefix,'\n',&eol);CHKERRQ(ierr); 61 if (eol) eol[0] = 0; 62 ierr = PetscStrchr(version,'\n',&eol);CHKERRQ(ierr); 63 if (eol) eol[0] = 0; 64 65 /* test for $prefix/lib64/libpythonX.X[.so]*/ 66 ierr = PetscStrcpy(pythonlib,prefix);CHKERRQ(ierr); 67 ierr = PetscStrcat(pythonlib,sep);CHKERRQ(ierr); 68 ierr = PetscStrcat(pythonlib,"lib64");CHKERRQ(ierr); 69 ierr = PetscTestDirectory(pythonlib,'r',&found);CHKERRQ(ierr); 70 if (found) { 71 ierr = PetscStrcat(pythonlib,sep);CHKERRQ(ierr); 72 ierr = PetscStrcat(pythonlib,"libpython");CHKERRQ(ierr); 73 ierr = PetscStrcat(pythonlib,version);CHKERRQ(ierr); 74 ierr = PetscDLLibraryRetrieve(PETSC_COMM_SELF,pythonlib,path,PETSC_MAX_PATH_LEN,&found);CHKERRQ(ierr); 75 if (found) PetscFunctionReturn(0); 76 } 77 78 /* test for $prefix/lib/libpythonX.X[.so]*/ 79 ierr = PetscStrcpy(pythonlib,prefix);CHKERRQ(ierr); 80 ierr = PetscStrcat(pythonlib,sep);CHKERRQ(ierr); 81 ierr = PetscStrcat(pythonlib,"lib");CHKERRQ(ierr); 82 ierr = PetscTestDirectory(pythonlib,'r',&found);CHKERRQ(ierr); 83 if (found) { 84 ierr = PetscStrcat(pythonlib,sep);CHKERRQ(ierr); 85 ierr = PetscStrcat(pythonlib,"libpython");CHKERRQ(ierr); 86 ierr = PetscStrcat(pythonlib,version);CHKERRQ(ierr); 87 ierr = PetscDLLibraryRetrieve(PETSC_COMM_SELF,pythonlib,path,PETSC_MAX_PATH_LEN,&found);CHKERRQ(ierr); 88 if (found) PetscFunctionReturn(0); 89 } 90 91 /* nothing good found */ 92 ierr = PetscMemzero(pythonlib,PETSC_MAX_PATH_LEN);CHKERRQ(ierr); 93 ierr = PetscInfo(0,"Python dynamic library not found\n");CHKERRQ(ierr); 94 95 PetscFunctionReturn(0); 96 } 97 98 /* ---------------------------------------------------------------- */ 99 100 typedef struct _Py_object_t PyObject; /* fake definition */ 101 102 static PyObject* Py_None = 0; 103 104 static const char* (*Py_GetVersion)(void); 105 106 static int (*Py_IsInitialized)(void); 107 static void (*Py_InitializeEx)(int); 108 static void (*Py_Finalize)(void); 109 110 static void (*PySys_SetArgv)(int, char **); 111 static PyObject* (*PyImport_ImportModule)(const char *); 112 113 static void (*Py_IncRef)(PyObject *); 114 static void (*Py_DecRef)(PyObject *); 115 116 static void (*PyErr_Clear)(void); 117 static PyObject* (*PyErr_Occurred)(void); 118 static void (*PyErr_Fetch)(PyObject **, PyObject **, PyObject **); 119 static void (*PyErr_NormalizeException)(PyObject **, PyObject **, PyObject **); 120 static void (*PyErr_Display)(PyObject *, PyObject *, PyObject *); 121 static void (*PyErr_Restore)(PyObject *, PyObject *, PyObject *); 122 123 124 #define PetscDLPyLibOpen(libname) \ 125 PetscDLLibraryAppend(PETSC_COMM_SELF,&DLLibrariesLoaded,libname) 126 #define PetscDLPyLibSym(symbol, value) \ 127 PetscDLLibrarySym(PETSC_COMM_SELF,&DLLibrariesLoaded,PETSC_NULL,symbol,(void**)value) 128 #define PetscDLPyLibClose(comm) \ 129 do { } while(0) 130 131 #undef __FUNCT__ 132 #define __FUNCT__ "PetscPythonLoadLibrary" 133 static PetscErrorCode PetscPythonLoadLibrary(const char pythonlib[]) 134 { 135 PetscErrorCode ierr; 136 PetscFunctionBegin; 137 138 /* open the Python dynamic library */ 139 ierr = PetscDLPyLibOpen(pythonlib);CHKERRQ(ierr); 140 ierr = PetscInfo1(0,"Python: loaded dynamic library %s\n", pythonlib);CHKERRQ(ierr); 141 /* look required symbols from the Python C-API */ 142 ierr = PetscDLPyLibSym("_Py_NoneStruct" , &Py_None );CHKERRQ(ierr); 143 ierr = PetscDLPyLibSym("Py_GetVersion" , &Py_GetVersion );CHKERRQ(ierr); 144 ierr = PetscDLPyLibSym("Py_IsInitialized" , &Py_IsInitialized );CHKERRQ(ierr); 145 ierr = PetscDLPyLibSym("Py_InitializeEx" , &Py_InitializeEx );CHKERRQ(ierr); 146 ierr = PetscDLPyLibSym("Py_Finalize" , &Py_Finalize );CHKERRQ(ierr); 147 ierr = PetscDLPyLibSym("PySys_SetArgv" , &PySys_SetArgv );CHKERRQ(ierr); 148 ierr = PetscDLPyLibSym("PyImport_ImportModule" , &PyImport_ImportModule );CHKERRQ(ierr); 149 ierr = PetscDLPyLibSym("Py_IncRef" , &Py_IncRef );CHKERRQ(ierr); 150 ierr = PetscDLPyLibSym("Py_DecRef" , &Py_DecRef );CHKERRQ(ierr); 151 ierr = PetscDLPyLibSym("PyErr_Clear" , &PyErr_Clear );CHKERRQ(ierr); 152 ierr = PetscDLPyLibSym("PyErr_Occurred" , &PyErr_Occurred );CHKERRQ(ierr); 153 ierr = PetscDLPyLibSym("PyErr_Fetch" , &PyErr_Fetch );CHKERRQ(ierr); 154 ierr = PetscDLPyLibSym("PyErr_NormalizeException", &PyErr_NormalizeException);CHKERRQ(ierr); 155 ierr = PetscDLPyLibSym("PyErr_Display", &PyErr_Display );CHKERRQ(ierr); 156 ierr = PetscDLPyLibSym("PyErr_Restore", &PyErr_Restore );CHKERRQ(ierr); 157 /* XXX TODO: check that ALL symbols were there !!! */ 158 if (!Py_None) SETERRQ(PETSC_COMM_SELF,1,"Python: failed to load symbols from dynamic library"); 159 if (!Py_GetVersion) SETERRQ(PETSC_COMM_SELF,1,"Python: failed to load symbols from dynamic library"); 160 if (!Py_IsInitialized) SETERRQ(PETSC_COMM_SELF,1,"Python: failed to load symbols from dynamic library"); 161 if (!Py_InitializeEx) SETERRQ(PETSC_COMM_SELF,1,"Python: failed to load symbols from dynamic library"); 162 if (!Py_Finalize) SETERRQ(PETSC_COMM_SELF,1,"Python: failed to load symbols from dynamic library"); 163 ierr = PetscInfo(0,"Python: all required symbols loaded from Python dynamic library\n");CHKERRQ(ierr); 164 165 PetscFunctionReturn(0); 166 } 167 168 /* ---------------------------------------------------------------- */ 169 170 static char PetscPythonExe[PETSC_MAX_PATH_LEN] = { 0 }; 171 static char PetscPythonLib[PETSC_MAX_PATH_LEN] = { 0 }; 172 static PetscBool PetscBeganPython = PETSC_FALSE; 173 174 #undef __FUNCT__ 175 #define __FUNCT__ "PetscPythonFinalize" 176 /*@C 177 PetscPythonFinalize - Finalize Python. 178 179 Level: intermediate 180 181 .keywords: Python 182 @*/ 183 PetscErrorCode PetscPythonFinalize(void) 184 { 185 PetscFunctionBegin; 186 if (PetscBeganPython) { if (Py_IsInitialized()) Py_Finalize(); } 187 PetscBeganPython = PETSC_FALSE; 188 PetscFunctionReturn(0); 189 } 190 191 #undef __FUNCT__ 192 #define __FUNCT__ "PetscPythonInitialize" 193 /*@C 194 PetscPythonInitialize - Initialize Python and import petsc4py. 195 196 Input Parameter: 197 + pyexe - path to the Python interpreter executable, or PETSC_NULL. 198 - pylib - full path to the Python dynamic library, or PETSC_NULL. 199 200 Level: intermediate 201 202 .keywords: Python 203 204 @*/ 205 PetscErrorCode PetscPythonInitialize(const char pyexe[],const char pylib[]) 206 { 207 PyObject *module = 0; 208 static PetscBool registered = PETSC_FALSE; 209 PetscErrorCode ierr; 210 PetscFunctionBegin; 211 if (PetscBeganPython) PetscFunctionReturn(0); 212 /* Python executable */ 213 if (pyexe && pyexe[0] != 0) { 214 ierr = PetscStrncpy(PetscPythonExe,pyexe,sizeof(PetscPythonExe));CHKERRQ(ierr); 215 } else { 216 ierr = PetscPythonFindExecutable(PetscPythonExe);CHKERRQ(ierr); 217 } 218 /* Python dynamic library */ 219 if (pylib && pylib[0] != 0) { 220 ierr = PetscStrncpy(PetscPythonLib,pylib,sizeof(PetscPythonLib));CHKERRQ(ierr); 221 } else { 222 ierr = PetscPythonFindLibrary(PetscPythonExe,PetscPythonLib);CHKERRQ(ierr); 223 } 224 /* dynamically load Python library */ 225 ierr = PetscPythonLoadLibrary(PetscPythonLib);CHKERRQ(ierr); 226 /* initialize Python */ 227 PetscBeganPython = PETSC_FALSE; 228 if (!Py_IsInitialized()) { 229 const char *py_version = Py_GetVersion(); 230 /* call below does not install signal handlers */ 231 Py_InitializeEx(0); 232 /* call below required to build 'sys.argv' list */ 233 if (py_version[0] == '2') { 234 int argc = 0; 235 char **argv = 0; 236 ierr = PetscGetArgs(&argc,&argv);CHKERRQ(ierr); 237 if (argc && argv) PySys_SetArgv(argc,argv); 238 } 239 /* register finalizer */ 240 if (!registered) { 241 ierr = PetscRegisterFinalize(PetscPythonFinalize);CHKERRQ(ierr); 242 registered = PETSC_TRUE; 243 } 244 PetscBeganPython = PETSC_TRUE; 245 } 246 /* import 'petsc4py.PETSc' module */ 247 module = PyImport_ImportModule("petsc4py.PETSc"); 248 if (module) { 249 ierr = PetscInfo(0,"Python: successfully imported module 'petsc4py.PETSc'\n");CHKERRQ(ierr); 250 Py_DecRef(module); module = 0; 251 } else { 252 PetscPythonPrintError(); 253 SETERRQ(PETSC_COMM_SELF,PETSC_ERR_PLIB,"Python: could not import module 'petsc4py.PETSc', perhaps your PYTHONPATH does not contain it\n"); 254 } 255 PetscFunctionReturn(0); 256 } 257 258 #undef __FUNCT__ 259 #define __FUNCT__ "PetscPythonPrintError" 260 /*@C 261 PetscPythonPrintError - Print Python errors. 262 263 Level: developer 264 265 .keywords: Python 266 267 @*/ 268 PetscErrorCode PetscPythonPrintError(void) 269 { 270 PyObject *exc=0, *val=0, *tb=0; 271 PetscFunctionBegin; 272 if (!PetscBeganPython) PetscFunctionReturn(0); 273 if (!PyErr_Occurred()) PetscFunctionReturn(0); 274 PyErr_Fetch(&exc,&val,&tb); 275 PyErr_NormalizeException(&exc,&val,&tb); 276 PyErr_Display(exc ? exc : Py_None, 277 val ? val : Py_None, 278 tb ? tb : Py_None); 279 PyErr_Restore(exc,val,tb); 280 PetscFunctionReturn(0); 281 } 282 283 /* ---------------------------------------------------------------- */ 284