Victor Stinner | 31a8393 | 2017-12-04 13:39:15 +0100 | [diff] [blame] | 1 | /* Path configuration like module_search_path (sys.path) */ |
| 2 | |
| 3 | #include "Python.h" |
| 4 | #include "osdefs.h" |
| 5 | #include "internal/pystate.h" |
| 6 | |
| 7 | #ifdef __cplusplus |
| 8 | extern "C" { |
| 9 | #endif |
| 10 | |
| 11 | |
| 12 | _PyPathConfig _Py_path_config = _PyPathConfig_INIT; |
| 13 | |
| 14 | |
| 15 | void |
| 16 | _PyPathConfig_Clear(_PyPathConfig *config) |
| 17 | { |
| 18 | /* _PyMem_SetDefaultAllocator() is needed to get a known memory allocator, |
| 19 | since Py_SetPath(), Py_SetPythonHome() and Py_SetProgramName() can be |
| 20 | called before Py_Initialize() which can changes the memory allocator. */ |
| 21 | PyMemAllocatorEx old_alloc; |
| 22 | _PyMem_SetDefaultAllocator(PYMEM_DOMAIN_RAW, &old_alloc); |
| 23 | |
| 24 | #define CLEAR(ATTR) \ |
| 25 | do { \ |
| 26 | PyMem_RawFree(ATTR); \ |
| 27 | ATTR = NULL; \ |
| 28 | } while (0) |
| 29 | |
| 30 | CLEAR(config->prefix); |
| 31 | CLEAR(config->program_full_path); |
| 32 | #ifdef MS_WINDOWS |
| 33 | CLEAR(config->dll_path); |
| 34 | #else |
| 35 | CLEAR(config->exec_prefix); |
| 36 | #endif |
| 37 | CLEAR(config->module_search_path); |
| 38 | CLEAR(config->home); |
| 39 | CLEAR(config->program_name); |
| 40 | #undef CLEAR |
| 41 | |
| 42 | PyMem_SetAllocator(PYMEM_DOMAIN_RAW, &old_alloc); |
| 43 | } |
| 44 | |
| 45 | |
| 46 | /* Initialize paths for Py_GetPath(), Py_GetPrefix(), Py_GetExecPrefix() |
| 47 | and Py_GetProgramFullPath() */ |
| 48 | _PyInitError |
| 49 | _PyPathConfig_Init(const _PyMainInterpreterConfig *main_config) |
| 50 | { |
| 51 | if (_Py_path_config.module_search_path) { |
| 52 | /* Already initialized */ |
| 53 | return _Py_INIT_OK(); |
| 54 | } |
| 55 | |
| 56 | _PyInitError err; |
| 57 | _PyPathConfig new_config = _PyPathConfig_INIT; |
| 58 | |
| 59 | PyMemAllocatorEx old_alloc; |
| 60 | _PyMem_SetDefaultAllocator(PYMEM_DOMAIN_RAW, &old_alloc); |
| 61 | |
| 62 | /* Calculate program_full_path, prefix, exec_prefix (Unix) |
| 63 | or dll_path (Windows), and module_search_path */ |
| 64 | err = _PyPathConfig_Calculate(&new_config, main_config); |
| 65 | if (_Py_INIT_FAILED(err)) { |
| 66 | _PyPathConfig_Clear(&new_config); |
| 67 | goto done; |
| 68 | } |
| 69 | |
| 70 | /* Copy home and program_name from main_config */ |
| 71 | if (main_config->home != NULL) { |
| 72 | new_config.home = _PyMem_RawWcsdup(main_config->home); |
| 73 | if (new_config.home == NULL) { |
| 74 | err = _Py_INIT_NO_MEMORY(); |
| 75 | goto done; |
| 76 | } |
| 77 | } |
| 78 | else { |
| 79 | new_config.home = NULL; |
| 80 | } |
| 81 | |
| 82 | new_config.program_name = _PyMem_RawWcsdup(main_config->program_name); |
| 83 | if (new_config.program_name == NULL) { |
| 84 | err = _Py_INIT_NO_MEMORY(); |
| 85 | goto done; |
| 86 | } |
| 87 | |
| 88 | _PyPathConfig_Clear(&_Py_path_config); |
| 89 | _Py_path_config = new_config; |
| 90 | |
| 91 | err = _Py_INIT_OK(); |
| 92 | |
| 93 | done: |
| 94 | PyMem_SetAllocator(PYMEM_DOMAIN_RAW, &old_alloc); |
| 95 | return err; |
| 96 | } |
| 97 | |
| 98 | |
| 99 | static void |
| 100 | pathconfig_global_init(void) |
| 101 | { |
| 102 | if (_Py_path_config.module_search_path) { |
| 103 | /* Already initialized */ |
| 104 | return; |
| 105 | } |
| 106 | |
| 107 | _PyInitError err; |
| 108 | _PyMainInterpreterConfig config = _PyMainInterpreterConfig_INIT; |
| 109 | |
| 110 | err = _PyMainInterpreterConfig_ReadEnv(&config); |
| 111 | if (_Py_INIT_FAILED(err)) { |
| 112 | goto error; |
| 113 | } |
| 114 | |
| 115 | err = _PyMainInterpreterConfig_Read(&config); |
| 116 | if (_Py_INIT_FAILED(err)) { |
| 117 | goto error; |
| 118 | } |
| 119 | |
| 120 | err = _PyPathConfig_Init(&config); |
| 121 | if (_Py_INIT_FAILED(err)) { |
| 122 | goto error; |
| 123 | } |
| 124 | |
| 125 | _PyMainInterpreterConfig_Clear(&config); |
| 126 | return; |
| 127 | |
| 128 | error: |
| 129 | _PyMainInterpreterConfig_Clear(&config); |
| 130 | _Py_FatalInitError(err); |
| 131 | } |
| 132 | |
| 133 | |
| 134 | /* External interface */ |
| 135 | |
| 136 | void |
| 137 | Py_SetPath(const wchar_t *path) |
| 138 | { |
| 139 | if (path == NULL) { |
| 140 | _PyPathConfig_Clear(&_Py_path_config); |
| 141 | return; |
| 142 | } |
| 143 | |
| 144 | PyMemAllocatorEx old_alloc; |
| 145 | _PyMem_SetDefaultAllocator(PYMEM_DOMAIN_RAW, &old_alloc); |
| 146 | |
| 147 | _PyPathConfig new_config; |
| 148 | new_config.program_full_path = _PyMem_RawWcsdup(Py_GetProgramName()); |
| 149 | new_config.prefix = _PyMem_RawWcsdup(L""); |
| 150 | #ifdef MS_WINDOWS |
| 151 | new_config.dll_path = _PyMem_RawWcsdup(L""); |
| 152 | #else |
| 153 | new_config.exec_prefix = _PyMem_RawWcsdup(L""); |
| 154 | #endif |
| 155 | new_config.module_search_path = _PyMem_RawWcsdup(path); |
| 156 | |
| 157 | /* steal the home and program_name values (to leave them unchanged) */ |
| 158 | new_config.home = _Py_path_config.home; |
| 159 | _Py_path_config.home = NULL; |
| 160 | new_config.program_name = _Py_path_config.program_name; |
| 161 | _Py_path_config.program_name = NULL; |
| 162 | |
| 163 | _PyPathConfig_Clear(&_Py_path_config); |
| 164 | _Py_path_config = new_config; |
| 165 | |
| 166 | PyMem_SetAllocator(PYMEM_DOMAIN_RAW, &old_alloc); |
| 167 | } |
| 168 | |
| 169 | |
| 170 | void |
Serhiy Storchaka | 4ae06c5 | 2017-12-12 13:55:04 +0200 | [diff] [blame] | 171 | Py_SetPythonHome(const wchar_t *home) |
Victor Stinner | 31a8393 | 2017-12-04 13:39:15 +0100 | [diff] [blame] | 172 | { |
| 173 | if (home == NULL) { |
| 174 | return; |
| 175 | } |
| 176 | |
| 177 | PyMemAllocatorEx old_alloc; |
| 178 | _PyMem_SetDefaultAllocator(PYMEM_DOMAIN_RAW, &old_alloc); |
| 179 | |
| 180 | PyMem_RawFree(_Py_path_config.home); |
| 181 | _Py_path_config.home = _PyMem_RawWcsdup(home); |
| 182 | |
| 183 | PyMem_SetAllocator(PYMEM_DOMAIN_RAW, &old_alloc); |
| 184 | |
| 185 | if (_Py_path_config.home == NULL) { |
| 186 | Py_FatalError("Py_SetPythonHome() failed: out of memory"); |
| 187 | } |
| 188 | } |
| 189 | |
| 190 | |
| 191 | void |
Serhiy Storchaka | 4ae06c5 | 2017-12-12 13:55:04 +0200 | [diff] [blame] | 192 | Py_SetProgramName(const wchar_t *program_name) |
Victor Stinner | 31a8393 | 2017-12-04 13:39:15 +0100 | [diff] [blame] | 193 | { |
| 194 | if (program_name == NULL || program_name[0] == L'\0') { |
| 195 | return; |
| 196 | } |
| 197 | |
| 198 | PyMemAllocatorEx old_alloc; |
| 199 | _PyMem_SetDefaultAllocator(PYMEM_DOMAIN_RAW, &old_alloc); |
| 200 | |
| 201 | PyMem_RawFree(_Py_path_config.program_name); |
| 202 | _Py_path_config.program_name = _PyMem_RawWcsdup(program_name); |
| 203 | |
| 204 | PyMem_SetAllocator(PYMEM_DOMAIN_RAW, &old_alloc); |
| 205 | |
| 206 | if (_Py_path_config.program_name == NULL) { |
| 207 | Py_FatalError("Py_SetProgramName() failed: out of memory"); |
| 208 | } |
| 209 | } |
| 210 | |
| 211 | |
| 212 | wchar_t * |
| 213 | Py_GetPath(void) |
| 214 | { |
| 215 | pathconfig_global_init(); |
| 216 | return _Py_path_config.module_search_path; |
| 217 | } |
| 218 | |
| 219 | |
| 220 | wchar_t * |
| 221 | Py_GetPrefix(void) |
| 222 | { |
| 223 | pathconfig_global_init(); |
| 224 | return _Py_path_config.prefix; |
| 225 | } |
| 226 | |
| 227 | |
| 228 | wchar_t * |
| 229 | Py_GetExecPrefix(void) |
| 230 | { |
| 231 | #ifdef MS_WINDOWS |
| 232 | return Py_GetPrefix(); |
| 233 | #else |
| 234 | pathconfig_global_init(); |
| 235 | return _Py_path_config.exec_prefix; |
| 236 | #endif |
| 237 | } |
| 238 | |
| 239 | |
| 240 | wchar_t * |
| 241 | Py_GetProgramFullPath(void) |
| 242 | { |
| 243 | pathconfig_global_init(); |
| 244 | return _Py_path_config.program_full_path; |
| 245 | } |
| 246 | |
| 247 | |
| 248 | wchar_t* |
| 249 | Py_GetPythonHome(void) |
| 250 | { |
| 251 | pathconfig_global_init(); |
| 252 | return _Py_path_config.home; |
| 253 | } |
| 254 | |
| 255 | |
| 256 | wchar_t * |
| 257 | Py_GetProgramName(void) |
| 258 | { |
| 259 | pathconfig_global_init(); |
| 260 | return _Py_path_config.program_name; |
| 261 | } |
| 262 | |
| 263 | |
Victor Stinner | 11a247d | 2017-12-13 21:05:57 +0100 | [diff] [blame^] | 264 | #define _HAVE_SCRIPT_ARGUMENT(argc, argv) \ |
| 265 | (argc > 0 && argv0 != NULL && \ |
| 266 | wcscmp(argv0, L"-c") != 0 && wcscmp(argv0, L"-m") != 0) |
| 267 | |
| 268 | /* Compute argv[0] which will be prepended to sys.argv */ |
| 269 | PyObject* |
| 270 | _PyPathConfig_ComputeArgv0(int argc, wchar_t **argv) |
| 271 | { |
| 272 | wchar_t *argv0; |
| 273 | wchar_t *p = NULL; |
| 274 | Py_ssize_t n = 0; |
| 275 | #ifdef HAVE_READLINK |
| 276 | wchar_t link[MAXPATHLEN+1]; |
| 277 | wchar_t argv0copy[2*MAXPATHLEN+1]; |
| 278 | int nr = 0; |
| 279 | #endif |
| 280 | #if defined(HAVE_REALPATH) |
| 281 | wchar_t fullpath[MAXPATHLEN]; |
| 282 | #elif defined(MS_WINDOWS) |
| 283 | wchar_t fullpath[MAX_PATH]; |
| 284 | #endif |
| 285 | |
| 286 | |
| 287 | argv0 = argv[0]; |
| 288 | |
| 289 | #ifdef HAVE_READLINK |
| 290 | if (_HAVE_SCRIPT_ARGUMENT(argc, argv)) |
| 291 | nr = _Py_wreadlink(argv0, link, MAXPATHLEN); |
| 292 | if (nr > 0) { |
| 293 | /* It's a symlink */ |
| 294 | link[nr] = '\0'; |
| 295 | if (link[0] == SEP) |
| 296 | argv0 = link; /* Link to absolute path */ |
| 297 | else if (wcschr(link, SEP) == NULL) |
| 298 | ; /* Link without path */ |
| 299 | else { |
| 300 | /* Must join(dirname(argv0), link) */ |
| 301 | wchar_t *q = wcsrchr(argv0, SEP); |
| 302 | if (q == NULL) |
| 303 | argv0 = link; /* argv0 without path */ |
| 304 | else { |
| 305 | /* Must make a copy, argv0copy has room for 2 * MAXPATHLEN */ |
| 306 | wcsncpy(argv0copy, argv0, MAXPATHLEN); |
| 307 | q = wcsrchr(argv0copy, SEP); |
| 308 | wcsncpy(q+1, link, MAXPATHLEN); |
| 309 | q[MAXPATHLEN + 1] = L'\0'; |
| 310 | argv0 = argv0copy; |
| 311 | } |
| 312 | } |
| 313 | } |
| 314 | #endif /* HAVE_READLINK */ |
| 315 | |
| 316 | #if SEP == '\\' |
| 317 | /* Special case for Microsoft filename syntax */ |
| 318 | if (_HAVE_SCRIPT_ARGUMENT(argc, argv)) { |
| 319 | wchar_t *q; |
| 320 | #if defined(MS_WINDOWS) |
| 321 | /* Replace the first element in argv with the full path. */ |
| 322 | wchar_t *ptemp; |
| 323 | if (GetFullPathNameW(argv0, |
| 324 | Py_ARRAY_LENGTH(fullpath), |
| 325 | fullpath, |
| 326 | &ptemp)) { |
| 327 | argv0 = fullpath; |
| 328 | } |
| 329 | #endif |
| 330 | p = wcsrchr(argv0, SEP); |
| 331 | /* Test for alternate separator */ |
| 332 | q = wcsrchr(p ? p : argv0, '/'); |
| 333 | if (q != NULL) |
| 334 | p = q; |
| 335 | if (p != NULL) { |
| 336 | n = p + 1 - argv0; |
| 337 | if (n > 1 && p[-1] != ':') |
| 338 | n--; /* Drop trailing separator */ |
| 339 | } |
| 340 | } |
| 341 | #else /* All other filename syntaxes */ |
| 342 | if (_HAVE_SCRIPT_ARGUMENT(argc, argv)) { |
| 343 | #if defined(HAVE_REALPATH) |
| 344 | if (_Py_wrealpath(argv0, fullpath, Py_ARRAY_LENGTH(fullpath))) { |
| 345 | argv0 = fullpath; |
| 346 | } |
| 347 | #endif |
| 348 | p = wcsrchr(argv0, SEP); |
| 349 | } |
| 350 | if (p != NULL) { |
| 351 | n = p + 1 - argv0; |
| 352 | #if SEP == '/' /* Special case for Unix filename syntax */ |
| 353 | if (n > 1) |
| 354 | n--; /* Drop trailing separator */ |
| 355 | #endif /* Unix */ |
| 356 | } |
| 357 | #endif /* All others */ |
| 358 | |
| 359 | return PyUnicode_FromWideChar(argv0, n); |
| 360 | } |
| 361 | |
Victor Stinner | 31a8393 | 2017-12-04 13:39:15 +0100 | [diff] [blame] | 362 | #ifdef __cplusplus |
| 363 | } |
| 364 | #endif |