cpython/Python/pythonrun.c at fe8440aec00af5bc2e995aaad205efa2e693a364 · python/cpython · GitHub

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/* Python interpreter top-level routines, including init/exit */

#include "Python.h"

#include "Python-ast.h"

#undef Yield /* undefine macro conflicting with winbase.h */

#include "grammar.h"

#include "node.h"

#include "token.h"

#include "parsetok.h"

#include "errcode.h"

#include "code.h"

#include "symtable.h"

#include "ast.h"

#include "marshal.h"

#include "osdefs.h"

#ifdef HAVE_SIGNAL_H

#include <signal.h>

#endif

#ifdef MS_WINDOWS

#include "malloc.h" /* for alloca */

#endif

#ifdef HAVE_LANGINFO_H

#include <locale.h>

#include <langinfo.h>

#endif

#ifdef MS_WINDOWS

#undef BYTE

#include "windows.h"

#define PATH_MAX MAXPATHLEN

#endif

#ifndef Py_REF_DEBUG

#define PRINT_TOTAL_REFS()

#else /* Py_REF_DEBUG */

#define PRINT_TOTAL_REFS() fprintf(stderr, \

"[%" PY_FORMAT_SIZE_T "d refs]\n", \

_Py_GetRefTotal())

#endif

#ifdef __cplusplus

extern "C" {

#endif

extern wchar_t *Py_GetPath(void);

extern grammar _PyParser_Grammar; /* From graminit.c */

/* Forward */

static void initmain(void);

static int initfsencoding(PyInterpreterState *interp);

static void initsite(void);

static int initstdio(void);

static void flush_io(void);

static PyObject *run_mod(mod_ty, const char *, PyObject *, PyObject *,

PyCompilerFlags *, PyArena *);

static PyObject *run_pyc_file(FILE *, const char *, PyObject *, PyObject *,

PyCompilerFlags *);

static void err_input(perrdetail *);

static void err_free(perrdetail *);

static void initsigs(void);

static void call_py_exitfuncs(void);

static void wait_for_thread_shutdown(void);

static void call_ll_exitfuncs(void);

extern int _PyUnicode_Init(void);

extern void _PyUnicode_Fini(void);

extern int _PyLong_Init(void);

extern void PyLong_Fini(void);

extern int _PyFaulthandler_Init(void);

extern void _PyFaulthandler_Fini(void);

#ifdef WITH_THREAD

extern void _PyGILState_Init(PyInterpreterState *, PyThreadState *);

extern void _PyGILState_Fini(void);

#endif /* WITH_THREAD */

int Py_DebugFlag; /* Needed by parser.c */

int Py_VerboseFlag; /* Needed by import.c */

int Py_QuietFlag; /* Needed by sysmodule.c */

int Py_InteractiveFlag; /* Needed by Py_FdIsInteractive() below */

int Py_InspectFlag; /* Needed to determine whether to exit at SystemExit */

int Py_NoSiteFlag; /* Suppress 'import site' */

int Py_BytesWarningFlag; /* Warn on str(bytes) and str(buffer) */

int Py_DontWriteBytecodeFlag; /* Suppress writing bytecode files (*.py[co]) */

int Py_UseClassExceptionsFlag = 1; /* Needed by bltinmodule.c: deprecated */

int Py_FrozenFlag; /* Needed by getpath.c */

int Py_IgnoreEnvironmentFlag; /* e.g. PYTHONPATH, PYTHONHOME */

int Py_NoUserSiteDirectory = 0; /* for -s and site.py */

int Py_UnbufferedStdioFlag = 0; /* Unbuffered binary std{in,out,err} */

int Py_HashRandomizationFlag = 0; /* for -R and PYTHONHASHSEED */

PyThreadState *_Py_Finalizing = NULL;

/* PyModule_GetWarningsModule is no longer necessary as of 2.6

since _warnings is builtin. This API should not be used. */

PyObject *

PyModule_GetWarningsModule(void)

{

return PyImport_ImportModule("warnings");

}

static int initialized = 0;

/* API to access the initialized flag -- useful for esoteric use */

int

Py_IsInitialized(void)

{

return initialized;

}

/* Global initializations. Can be undone by Py_Finalize(). Don't

call this twice without an intervening Py_Finalize() call. When

initializations fail, a fatal error is issued and the function does

not return. On return, the first thread and interpreter state have

been created.

Locking: you must hold the interpreter lock while calling this.

(If the lock has not yet been initialized, that's equivalent to

having the lock, but you cannot use multiple threads.)

static int

add_flag(int flag, const char *envs)

{

int env = atoi(envs);

if (flag < env)

flag = env;

if (flag < 1)

flag = 1;

return flag;

}

static char*

get_codec_name(const char *encoding)

{

char *name_utf8, *name_str;

PyObject *codec, *name = NULL;

_Py_IDENTIFIER(name);

codec = _PyCodec_Lookup(encoding);

if (!codec)

goto error;

name = _PyObject_GetAttrId(codec, &PyId_name);

Py_CLEAR(codec);

if (!name)

goto error;

name_utf8 = _PyUnicode_AsString(name);

if (name_utf8 == NULL)

goto error;

name_str = strdup(name_utf8);

Py_DECREF(name);

if (name_str == NULL) {

PyErr_NoMemory();

return NULL;

}

return name_str;

error:

Py_XDECREF(codec);

Py_XDECREF(name);

return NULL;

}

static char*

get_locale_encoding(void)

{

#ifdef MS_WINDOWS

char codepage[100];

PyOS_snprintf(codepage, sizeof(codepage), "cp%d", GetACP());

return get_codec_name(codepage);

#elif defined(HAVE_LANGINFO_H) && defined(CODESET)

char* codeset = nl_langinfo(CODESET);

if (!codeset || codeset[0] == '\0') {

PyErr_SetString(PyExc_ValueError, "CODESET is not set or empty");

return NULL;

}

return get_codec_name(codeset);

#else

PyErr_SetNone(PyExc_NotImplementedError);

return NULL;

#endif

}

static void

import_init(PyInterpreterState *interp, PyObject *sysmod)

{

PyObject *importlib;

PyObject *impmod;

PyObject *sys_modules;

PyObject *value;

/* Import _importlib through its frozen version, _frozen_importlib. */

if (PyImport_ImportFrozenModule("_frozen_importlib") <= 0) {

Py_FatalError("Py_Initialize: can't import _frozen_importlib");

}

else if (Py_VerboseFlag) {

PySys_FormatStderr("import _frozen_importlib # frozen\n");

}

importlib = PyImport_AddModule("_frozen_importlib");

if (importlib == NULL) {

Py_FatalError("Py_Initialize: couldn't get _frozen_importlib from "

"sys.modules");

}

interp->importlib = importlib;

Py_INCREF(interp->importlib);

/* Install _importlib as __import__ */

impmod = PyInit_imp();

if (impmod == NULL) {

Py_FatalError("Py_Initialize: can't import imp");

}

else if (Py_VerboseFlag) {

PySys_FormatStderr("import imp # builtin\n");

}

sys_modules = PyImport_GetModuleDict();

if (Py_VerboseFlag) {

PySys_FormatStderr("import sys # builtin\n");

}

if (PyDict_SetItemString(sys_modules, "_imp", impmod) < 0) {

Py_FatalError("Py_Initialize: can't save _imp to sys.modules");

}

value = PyObject_CallMethod(importlib, "_install", "OO", sysmod, impmod);

if (value == NULL) {

PyErr_Print();

Py_FatalError("Py_Initialize: importlib install failed");

}

Py_DECREF(value);

Py_DECREF(impmod);

_PyImportZip_Init();

}

void

Py_InitializeEx(int install_sigs)

{

PyInterpreterState *interp;

PyThreadState *tstate;

PyObject *bimod, *sysmod, *pstderr;

char *p;

extern void _Py_ReadyTypes(void);

if (initialized)

return;

initialized = 1;

_Py_Finalizing = NULL;

#if defined(HAVE_LANGINFO_H) && defined(HAVE_SETLOCALE)

/* Set up the LC_CTYPE locale, so we can obtain

the locale's charset without having to switch

locales. */

setlocale(LC_CTYPE, "");

#endif

if ((p = Py_GETENV("PYTHONDEBUG")) && *p != '\0')

Py_DebugFlag = add_flag(Py_DebugFlag, p);

if ((p = Py_GETENV("PYTHONVERBOSE")) && *p != '\0')

Py_VerboseFlag = add_flag(Py_VerboseFlag, p);

if ((p = Py_GETENV("PYTHONOPTIMIZE")) && *p != '\0')

Py_OptimizeFlag = add_flag(Py_OptimizeFlag, p);

if ((p = Py_GETENV("PYTHONDONTWRITEBYTECODE")) && *p != '\0')

Py_DontWriteBytecodeFlag = add_flag(Py_DontWriteBytecodeFlag, p);

/* The variable is only tested for existence here; _PyRandom_Init will

check its value further. */

if ((p = Py_GETENV("PYTHONHASHSEED")) && *p != '\0')

Py_HashRandomizationFlag = add_flag(Py_HashRandomizationFlag, p);

_PyRandom_Init();

interp = PyInterpreterState_New();

if (interp == NULL)

Py_FatalError("Py_Initialize: can't make first interpreter");

tstate = PyThreadState_New(interp);

if (tstate == NULL)

Py_FatalError("Py_Initialize: can't make first thread");

(void) PyThreadState_Swap(tstate);

#ifdef WITH_THREAD

/* We can't call _PyEval_FiniThreads() in Py_Finalize because

destroying the GIL might fail when it is being referenced from

another running thread (see issue #9901).

Instead we destroy the previously created GIL here, which ensures

that we can call Py_Initialize / Py_Finalize multiple times. */

_PyEval_FiniThreads();

/* Auto-thread-state API */

_PyGILState_Init(interp, tstate);

#endif /* WITH_THREAD */

_Py_ReadyTypes();

if (!_PyFrame_Init())

Py_FatalError("Py_Initialize: can't init frames");

if (!_PyLong_Init())

Py_FatalError("Py_Initialize: can't init longs");

if (!PyByteArray_Init())

Py_FatalError("Py_Initialize: can't init bytearray");

_PyFloat_Init();

interp->modules = PyDict_New();

if (interp->modules == NULL)

Py_FatalError("Py_Initialize: can't make modules dictionary");

/* Init Unicode implementation; relies on the codec registry */

if (_PyUnicode_Init() < 0)

Py_FatalError("Py_Initialize: can't initialize unicode");

bimod = _PyBuiltin_Init();

if (bimod == NULL)

Py_FatalError("Py_Initialize: can't initialize builtins modules");

_PyImport_FixupBuiltin(bimod, "builtins");

interp->builtins = PyModule_GetDict(bimod);

if (interp->builtins == NULL)

Py_FatalError("Py_Initialize: can't initialize builtins dict");

Py_INCREF(interp->builtins);

/* initialize builtin exceptions */

_PyExc_Init(bimod);

sysmod = _PySys_Init();

if (sysmod == NULL)

Py_FatalError("Py_Initialize: can't initialize sys");

interp->sysdict = PyModule_GetDict(sysmod);

if (interp->sysdict == NULL)

Py_FatalError("Py_Initialize: can't initialize sys dict");

Py_INCREF(interp->sysdict);

_PyImport_FixupBuiltin(sysmod, "sys");

PySys_SetPath(Py_GetPath());

PyDict_SetItemString(interp->sysdict, "modules",

interp->modules);

/* Set up a preliminary stderr printer until we have enough

infrastructure for the io module in place. */

pstderr = PyFile_NewStdPrinter(fileno(stderr));

if (pstderr == NULL)

Py_FatalError("Py_Initialize: can't set preliminary stderr");

PySys_SetObject("stderr", pstderr);

PySys_SetObject("__stderr__", pstderr);

Py_DECREF(pstderr);

_PyImport_Init();

_PyImportHooks_Init();

/* initialize the faulthandler module */

if (_PyFaulthandler_Init())

Py_FatalError("Py_Initialize: can't initialize faulthandler");

/* Initialize _warnings. */

_PyWarnings_Init();

import_init(interp, sysmod);

_PyTime_Init();

if (initfsencoding(interp) < 0)

Py_FatalError("Py_Initialize: unable to load the file system codec");

if (install_sigs)

initsigs(); /* Signal handling stuff, including initintr() */

initmain(); /* Module __main__ */

if (initstdio() < 0)

Py_FatalError(

"Py_Initialize: can't initialize sys standard streams");

/* Initialize warnings. */

if (PySys_HasWarnOptions()) {

PyObject *warnings_module = PyImport_ImportModule("warnings");

if (warnings_module == NULL) {

fprintf(stderr, "'import warnings' failed; traceback:\n");

PyErr_Print();

}

Py_XDECREF(warnings_module);

}

if (!Py_NoSiteFlag)

initsite(); /* Module site */

}

void

Py_Initialize(void)

{

Py_InitializeEx(1);

}

#ifdef COUNT_ALLOCS

extern void dump_counts(FILE*);

#endif

/* Flush stdout and stderr */

static int

file_is_closed(PyObject *fobj)

{

int r;

PyObject *tmp = PyObject_GetAttrString(fobj, "closed");

if (tmp == NULL) {

PyErr_Clear();

return 0;

}

r = PyObject_IsTrue(tmp);

Py_DECREF(tmp);

if (r < 0)

PyErr_Clear();

return r > 0;

}

static void

flush_std_files(void)

{

PyObject *fout = PySys_GetObject("stdout");

PyObject *ferr = PySys_GetObject("stderr");

PyObject *tmp;

_Py_IDENTIFIER(flush);

if (fout != NULL && fout != Py_None && !file_is_closed(fout)) {

tmp = _PyObject_CallMethodId(fout, &PyId_flush, "");

if (tmp == NULL)

PyErr_WriteUnraisable(fout);

else

Py_DECREF(tmp);

}

if (ferr != NULL && ferr != Py_None && !file_is_closed(ferr)) {

tmp = _PyObject_CallMethodId(ferr, &PyId_flush, "");

if (tmp == NULL)

PyErr_Clear();

else

Py_DECREF(tmp);

}

/* Undo the effect of Py_Initialize().

Beware: if multiple interpreter and/or thread states exist, these

are not wiped out; only the current thread and interpreter state

are deleted. But since everything else is deleted, those other

interpreter and thread states should no longer be used.

(XXX We should do better, e.g. wipe out all interpreters and

threads.)

Locking: as above.

void

Py_Finalize(void)

{

PyInterpreterState *interp;

PyThreadState *tstate;

if (!initialized)

return;

wait_for_thread_shutdown();

/* The interpreter is still entirely intact at this point, and the

* exit funcs may be relying on that. In particular, if some thread

* or exit func is still waiting to do an import, the import machinery

* expects Py_IsInitialized() to return true. So don't say the

* interpreter is uninitialized until after the exit funcs have run.

* Note that Threading.py uses an exit func to do a join on all the

* threads created thru it, so this also protects pending imports in

* the threads created via Threading.

call_py_exitfuncs();

/* Get current thread state and interpreter pointer */

tstate = PyThreadState_GET();

interp = tstate->interp;

/* Remaining threads (e.g. daemon threads) will automatically exit

after taking the GIL (in PyEval_RestoreThread()). */

_Py_Finalizing = tstate;

initialized = 0;

/* Flush stdout+stderr */

flush_std_files();

/* Disable signal handling */

PyOS_FiniInterrupts();

/* Clear type lookup cache */

PyType_ClearCache();

/* Collect garbage. This may call finalizers; it's nice to call these

* before all modules are destroyed.

* XXX If a __del__ or weakref callback is triggered here, and tries to

* XXX import a module, bad things can happen, because Python no

* XXX longer believes it's initialized.

* XXX Fatal Python error: Interpreter not initialized (version mismatch?)

* XXX is easy to provoke that way. I've also seen, e.g.,

* XXX Exception exceptions.ImportError: 'No module named sha'

* XXX in <function callback at 0x008F5718> ignored

* XXX but I'm unclear on exactly how that one happens. In any case,

* XXX I haven't seen a real-life report of either of these.

PyGC_Collect();

#ifdef COUNT_ALLOCS

/* With COUNT_ALLOCS, it helps to run GC multiple times:

each collection might release some types from the type

list, so they become garbage. */

while (PyGC_Collect() > 0)

/* nothing */;

#endif

/* We run this while most interpreter state is still alive, so that

debug information can be printed out */

_PyGC_Fini();

/* Destroy all modules */

PyImport_Cleanup();

/* Flush stdout+stderr (again, in case more was printed) */

flush_std_files();

/* Collect final garbage. This disposes of cycles created by

* class definitions, for example.

* XXX This is disabled because it caused too many problems. If

* XXX a __del__ or weakref callback triggers here, Python code has

* XXX a hard time running, because even the sys module has been

* XXX cleared out (sys.stdout is gone, sys.excepthook is gone, etc).

* XXX One symptom is a sequence of information-free messages

* XXX coming from threads (if a __del__ or callback is invoked,

* XXX other threads can execute too, and any exception they encounter

* XXX triggers a comedy of errors as subsystem after subsystem

* XXX fails to find what it *expects* to find in sys to help report

* XXX the exception and consequent unexpected failures). I've also

* XXX seen segfaults then, after adding print statements to the

* XXX Python code getting called.

#if 0

PyGC_Collect();

#endif

/* Destroy the database used by _PyImport_{Fixup,Find}Extension */

_PyImport_Fini();

/* unload faulthandler module */

_PyFaulthandler_Fini();

/* Debugging stuff */

#ifdef COUNT_ALLOCS

dump_counts(stdout);

#endif

PRINT_TOTAL_REFS();

#ifdef Py_TRACE_REFS

/* Display all objects still alive -- this can invoke arbitrary

* __repr__ overrides, so requires a mostly-intact interpreter.

* Alas, a lot of stuff may still be alive now that will be cleaned

* up later.

if (Py_GETENV("PYTHONDUMPREFS"))

_Py_PrintReferences(stderr);

#endif /* Py_TRACE_REFS */

/* Clear interpreter state */

PyInterpreterState_Clear(interp);

/* Now we decref the exception classes. After this point nothing

can raise an exception. That's okay, because each Fini() method

below has been checked to make sure no exceptions are ever

raised.

_PyExc_Fini();

/* Cleanup auto-thread-state */

#ifdef WITH_THREAD

_PyGILState_Fini();

#endif /* WITH_THREAD */

/* Delete current thread */

PyThreadState_Swap(NULL);

PyInterpreterState_Delete(interp);

/* Sundry finalizers */

PyMethod_Fini();

PyFrame_Fini();

PyCFunction_Fini();

PyTuple_Fini();

PyList_Fini();

PySet_Fini();

PyBytes_Fini();

PyByteArray_Fini();

PyLong_Fini();

PyFloat_Fini();

PyDict_Fini();

PySlice_Fini();

/* Cleanup Unicode implementation */

_PyUnicode_Fini();

/* reset file system default encoding */

if (!Py_HasFileSystemDefaultEncoding && Py_FileSystemDefaultEncoding) {

free((char*)Py_FileSystemDefaultEncoding);

Py_FileSystemDefaultEncoding = NULL;

}

/* XXX Still allocated:

- various static ad-hoc pointers to interned strings

- int and float free list blocks

- whatever various modules and libraries allocate

PyGrammar_RemoveAccelerators(&_PyParser_Grammar);

#ifdef Py_TRACE_REFS

/* Display addresses (& refcnts) of all objects still alive.

* An address can be used to find the repr of the object, printed

* above by _Py_PrintReferences.

if (Py_GETENV("PYTHONDUMPREFS"))

_Py_PrintReferenceAddresses(stderr);

#endif /* Py_TRACE_REFS */

#ifdef PYMALLOC_DEBUG

if (Py_GETENV("PYTHONMALLOCSTATS"))

_PyObject_DebugMallocStats();

#endif

call_ll_exitfuncs();

}

/* Create and initialize a new interpreter and thread, and return the

new thread. This requires that Py_Initialize() has been called

first.

Unsuccessful initialization yields a NULL pointer. Note that *no*

exception information is available even in this case -- the

exception information is held in the thread, and there is no

thread.

Locking: as above.

PyThreadState *

Py_NewInterpreter(void)

{

PyInterpreterState *interp;

PyThreadState *tstate, *save_tstate;

PyObject *bimod, *sysmod;

if (!initialized)

Py_FatalError("Py_NewInterpreter: call Py_Initialize first");

interp = PyInterpreterState_New();

if (interp == NULL)

return NULL;

tstate = PyThreadState_New(interp);

if (tstate == NULL) {

PyInterpreterState_Delete(interp);

return NULL;

}

save_tstate = PyThreadState_Swap(tstate);

/* XXX The following is lax in error checking */

interp->modules = PyDict_New();

bimod = _PyImport_FindBuiltin("builtins");

if (bimod != NULL) {

interp->builtins = PyModule_GetDict(bimod);

if (interp->builtins == NULL)

goto handle_error;

Py_INCREF(interp->builtins);

}

/* initialize builtin exceptions */

_PyExc_Init(bimod);

sysmod = _PyImport_FindBuiltin("sys");

if (bimod != NULL && sysmod != NULL) {

PyObject *pstderr;

interp->sysdict = PyModule_GetDict(sysmod);

if (interp->sysdict == NULL)

goto handle_error;

Py_INCREF(interp->sysdict);

PySys_SetPath(Py_GetPath());

PyDict_SetItemString(interp->sysdict, "modules",

interp->modules);

/* Set up a preliminary stderr printer until we have enough

infrastructure for the io module in place. */

pstderr = PyFile_NewStdPrinter(fileno(stderr));

if (pstderr == NULL)

Py_FatalError("Py_Initialize: can't set preliminary stderr");

PySys_SetObject("stderr", pstderr);

PySys_SetObject("__stderr__", pstderr);

Py_DECREF(pstderr);

_PyImportHooks_Init();

import_init(interp, sysmod);

if (initfsencoding(interp) < 0)

goto handle_error;

if (initstdio() < 0)

Py_FatalError(

"Py_Initialize: can't initialize sys standard streams");

initmain();

if (!Py_NoSiteFlag)

initsite();

}

if (!PyErr_Occurred())

return tstate;

handle_error:

/* Oops, it didn't work. Undo it all. */

PyErr_PrintEx(0);

PyThreadState_Clear(tstate);

PyThreadState_Swap(save_tstate);

PyThreadState_Delete(tstate);

PyInterpreterState_Delete(interp);

return NULL;

}

/* Delete an interpreter and its last thread. This requires that the

given thread state is current, that the thread has no remaining

frames, and that it is its interpreter's only remaining thread.

It is a fatal error to violate these constraints.

(Py_Finalize() doesn't have these constraints -- it zaps

everything, regardless.)

Locking: as above.

void

Py_EndInterpreter(PyThreadState *tstate)

{

PyInterpreterState *interp = tstate->interp;

if (tstate != PyThreadState_GET())

Py_FatalError("Py_EndInterpreter: thread is not current");

if (tstate->frame != NULL)

Py_FatalError("Py_EndInterpreter: thread still has a frame");

if (tstate != interp->tstate_head || tstate->next != NULL)

Py_FatalError("Py_EndInterpreter: not the last thread");

PyImport_Cleanup();

PyInterpreterState_Clear(interp);

PyThreadState_Swap(NULL);

PyInterpreterState_Delete(interp);

}

static wchar_t *progname = L"python";

void

Py_SetProgramName(wchar_t *pn)

{

if (pn && *pn)

progname = pn;

}

wchar_t *

Py_GetProgramName(void)

{

return progname;

}

static wchar_t *default_home = NULL;

static wchar_t env_home[PATH_MAX+1];

void

Py_SetPythonHome(wchar_t *home)

{

default_home = home;

}

wchar_t *

Py_GetPythonHome(void)

{

wchar_t *home = default_home;

if (home == NULL && !Py_IgnoreEnvironmentFlag) {

char* chome = Py_GETENV("PYTHONHOME");

if (chome) {

size_t r = mbstowcs(env_home, chome, PATH_MAX+1);

if (r != (size_t)-1 && r <= PATH_MAX)

home = env_home;

}

return home;

}

/* Create __main__ module */

static void

initmain(void)

{

PyObject *m, *d;

m = PyImport_AddModule("__main__");

if (m == NULL)

Py_FatalError("can't create __main__ module");

d = PyModule_GetDict(m);

if (PyDict_GetItemString(d, "__builtins__") == NULL) {

PyObject *bimod = PyImport_ImportModule("builtins");

if (bimod == NULL ||

PyDict_SetItemString(d, "__builtins__", bimod) != 0)

Py_FatalError("can't add __builtins__ to __main__");

Py_DECREF(bimod);

}

static int

initfsencoding(PyInterpreterState *interp)

{

PyObject *codec;

if (Py_FileSystemDefaultEncoding == NULL)

{

Py_FileSystemDefaultEncoding = get_locale_encoding();

if (Py_FileSystemDefaultEncoding == NULL)

Py_FatalError("Py_Initialize: Unable to get the locale encoding");

Py_HasFileSystemDefaultEncoding = 0;

interp->fscodec_initialized = 1;

return 0;

}

/* the encoding is mbcs, utf-8 or ascii */

codec = _PyCodec_Lookup(Py_FileSystemDefaultEncoding);

if (!codec) {

/* Such error can only occurs in critical situations: no more

* memory, import a module of the standard library failed,

* etc. */

return -1;

}

Py_DECREF(codec);

interp->fscodec_initialized = 1;

return 0;

}

/* Import the site module (not into __main__ though) */

static void

initsite(void)

{

PyObject *m;

m = PyImport_ImportModule("site");

if (m == NULL) {

PyErr_Print();

Py_Finalize();

exit(1);

}

else {

Py_DECREF(m);

}

static PyObject*

create_stdio(PyObject* io,

int fd, int write_mode, char* name,

char* encoding, char* errors)

{

PyObject *buf = NULL, *stream = NULL, *text = NULL, *raw = NULL, *res;

const char* mode;

const char* newline;

PyObject *line_buffering;

int buffering, isatty;

_Py_IDENTIFIER(open);

_Py_IDENTIFIER(isatty);

_Py_IDENTIFIER(TextIOWrapper);

_Py_IDENTIFIER(name);

_Py_IDENTIFIER(mode);

/* stdin is always opened in buffered mode, first because it shouldn't

make a difference in common use cases, second because TextIOWrapper

depends on the presence of a read1() method which only exists on

buffered streams.

if (Py_UnbufferedStdioFlag && write_mode)

buffering = 0;

else

buffering = -1;

if (write_mode)

mode = "wb";

else

mode = "rb";

buf = _PyObject_CallMethodId(io, &PyId_open, "isiOOOi",

fd, mode, buffering,

Py_None, Py_None, Py_None, 0);

if (buf == NULL)

goto error;

if (buffering) {

_Py_IDENTIFIER(raw);

raw = _PyObject_GetAttrId(buf, &PyId_raw);

if (raw == NULL)

goto error;

}

else {

raw = buf;

Py_INCREF(raw);

}

text = PyUnicode_FromString(name);

if (text == NULL || _PyObject_SetAttrId(raw, &PyId_name, text) < 0)

goto error;

res = _PyObject_CallMethodId(raw, &PyId_isatty, "");

if (res == NULL)

goto error;

isatty = PyObject_IsTrue(res);

Py_DECREF(res);

if (isatty == -1)

goto error;

if (isatty || Py_UnbufferedStdioFlag)

line_buffering = Py_True;

else

line_buffering = Py_False;

Py_CLEAR(raw);

Py_CLEAR(text);

newline = "\n";

#ifdef MS_WINDOWS

if (!write_mode) {

/* translate \r\n to \n for sys.stdin on Windows */

newline = NULL;

}

#endif

stream = _PyObject_CallMethodId(io, &PyId_TextIOWrapper, "OsssO",

buf, encoding, errors,

newline, line_buffering);

Py_CLEAR(buf);

if (stream == NULL)

goto error;

if (write_mode)

mode = "w";

else

mode = "r";

text = PyUnicode_FromString(mode);

if (!text || _PyObject_SetAttrId(stream, &PyId_mode, text) < 0)

goto error;

Py_CLEAR(text);

return stream;

error:

Py_XDECREF(buf);

Py_XDECREF(stream);

Py_XDECREF(text);

Py_XDECREF(raw);

return NULL;

}

static int

is_valid_fd(int fd)

{

int dummy_fd;

if (fd < 0 || !_PyVerify_fd(fd))

return 0;

dummy_fd = dup(fd);

if (dummy_fd < 0)

return 0;

close(dummy_fd);

return 1;

}

/* Initialize sys.stdin, stdout, stderr and builtins.open */

static int

initstdio(void)

{

PyObject *iomod = NULL, *wrapper;

PyObject *bimod = NULL;

PyObject *m;

PyObject *std = NULL;

int status = 0, fd;

PyObject * encoding_attr;

char *encoding = NULL, *errors;

/* Hack to avoid a nasty recursion issue when Python is invoked

in verbose mode: pre-import the Latin-1 and UTF-8 codecs */

View remainder of file in raw view

cpython/Python/pythonrun.c at fe8440aec00af5bc2e995aaad205efa2e693a364 · python/cpython · GitHub

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