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