mirror of
https://github.com/python/cpython.git
synced 2024-11-21 21:09:37 +01:00
12083284c5
Py_Main() and _Py_RunMain() now return the exitcode rather than calling Py_Exit(exitcode) when calling PyErr_Print() if the current exception type is SystemExit. * Add _Py_HandleSystemExit(). * Add pymain_exit_err_print(). * Add pymain_exit_print().
670 lines
16 KiB
C
670 lines
16 KiB
C
/* Python interpreter main program */
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#include "Python.h"
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#include "pycore_coreconfig.h"
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#include "pycore_pylifecycle.h"
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#include "pycore_pymem.h"
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#include "pycore_pystate.h"
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#ifdef __FreeBSD__
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# include <fenv.h> /* fedisableexcept() */
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#endif
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/* Includes for exit_sigint() */
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#include <stdio.h> /* perror() */
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#ifdef HAVE_SIGNAL_H
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# include <signal.h> /* SIGINT */
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#endif
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#if defined(HAVE_GETPID) && defined(HAVE_UNISTD_H)
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# include <unistd.h> /* getpid() */
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#endif
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#ifdef _MSC_VER
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# include <crtdbg.h> /* STATUS_CONTROL_C_EXIT */
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#endif
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/* End of includes for exit_sigint() */
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#define COPYRIGHT \
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"Type \"help\", \"copyright\", \"credits\" or \"license\" " \
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"for more information."
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#ifdef __cplusplus
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extern "C" {
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#endif
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/* --- pymain_init() ---------------------------------------------- */
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static _PyInitError
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pymain_init(const _PyArgv *args)
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{
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_PyInitError err;
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err = _PyRuntime_Initialize();
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if (_Py_INIT_FAILED(err)) {
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return err;
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}
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/* 754 requires that FP exceptions run in "no stop" mode by default,
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* and until C vendors implement C99's ways to control FP exceptions,
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* Python requires non-stop mode. Alas, some platforms enable FP
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* exceptions by default. Here we disable them.
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*/
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#ifdef __FreeBSD__
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fedisableexcept(FE_OVERFLOW);
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#endif
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_PyPreConfig preconfig;
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_PyPreConfig_InitPythonConfig(&preconfig);
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err = _Py_PreInitializeFromPyArgv(&preconfig, args);
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if (_Py_INIT_FAILED(err)) {
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return err;
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}
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_PyCoreConfig config;
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err = _PyCoreConfig_InitPythonConfig(&config);
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if (_Py_INIT_FAILED(err)) {
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return err;
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}
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/* pass NULL as the config: config is read from command line arguments,
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environment variables, configuration files */
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if (args->use_bytes_argv) {
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return _Py_InitializeFromArgs(&config,
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args->argc, args->bytes_argv);
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}
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else {
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return _Py_InitializeFromWideArgs(&config,
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args->argc, args->wchar_argv);
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}
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}
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/* --- pymain_run_python() ---------------------------------------- */
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/* Non-zero if filename, command (-c) or module (-m) is set
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on the command line */
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#define RUN_CODE(config) \
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(config->run_command != NULL || config->run_filename != NULL \
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|| config->run_module != NULL)
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/* Return non-zero is stdin is a TTY or if -i command line option is used */
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static int
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stdin_is_interactive(const _PyCoreConfig *config)
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{
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return (isatty(fileno(stdin)) || config->interactive);
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}
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/* Display the current Python exception and return an exitcode */
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static int
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pymain_err_print(int *exitcode_p)
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{
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int exitcode;
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if (_Py_HandleSystemExit(&exitcode)) {
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*exitcode_p = exitcode;
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return 1;
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}
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PyErr_Print();
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return 0;
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}
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static int
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pymain_exit_err_print(void)
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{
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int exitcode = 1;
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pymain_err_print(&exitcode);
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return exitcode;
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}
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/* Write an exitcode into *exitcode and return 1 if we have to exit Python.
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Return 0 otherwise. */
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static int
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pymain_get_importer(const wchar_t *filename, PyObject **importer_p, int *exitcode)
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{
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PyObject *sys_path0 = NULL, *importer;
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sys_path0 = PyUnicode_FromWideChar(filename, wcslen(filename));
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if (sys_path0 == NULL) {
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goto error;
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}
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importer = PyImport_GetImporter(sys_path0);
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if (importer == NULL) {
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goto error;
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}
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if (importer == Py_None) {
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Py_DECREF(sys_path0);
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Py_DECREF(importer);
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return 0;
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}
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Py_DECREF(importer);
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*importer_p = sys_path0;
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return 0;
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error:
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Py_XDECREF(sys_path0);
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PySys_WriteStderr("Failed checking if argv[0] is an import path entry\n");
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return pymain_err_print(exitcode);
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}
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static int
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pymain_sys_path_add_path0(PyInterpreterState *interp, PyObject *path0)
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{
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_Py_IDENTIFIER(path);
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PyObject *sys_path;
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PyObject *sysdict = interp->sysdict;
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if (sysdict != NULL) {
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sys_path = _PyDict_GetItemIdWithError(sysdict, &PyId_path);
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if (sys_path == NULL && PyErr_Occurred()) {
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return -1;
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}
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}
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else {
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sys_path = NULL;
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}
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if (sys_path == NULL) {
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PyErr_SetString(PyExc_RuntimeError, "unable to get sys.path");
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return -1;
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}
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if (PyList_Insert(sys_path, 0, path0)) {
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return -1;
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}
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return 0;
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}
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static void
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pymain_header(const _PyCoreConfig *config)
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{
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if (config->quiet) {
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return;
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}
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if (!config->verbose && (RUN_CODE(config) || !stdin_is_interactive(config))) {
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return;
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}
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fprintf(stderr, "Python %s on %s\n", Py_GetVersion(), Py_GetPlatform());
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if (config->site_import) {
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fprintf(stderr, "%s\n", COPYRIGHT);
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}
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}
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static void
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pymain_import_readline(const _PyCoreConfig *config)
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{
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if (config->isolated) {
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return;
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}
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if (!config->inspect && RUN_CODE(config)) {
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return;
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}
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if (!isatty(fileno(stdin))) {
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return;
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}
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PyObject *mod = PyImport_ImportModule("readline");
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if (mod == NULL) {
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PyErr_Clear();
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}
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else {
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Py_DECREF(mod);
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}
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}
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static int
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pymain_run_command(wchar_t *command, PyCompilerFlags *cf)
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{
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PyObject *unicode, *bytes;
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int ret;
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unicode = PyUnicode_FromWideChar(command, -1);
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if (unicode == NULL) {
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goto error;
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}
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bytes = PyUnicode_AsUTF8String(unicode);
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Py_DECREF(unicode);
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if (bytes == NULL) {
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goto error;
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}
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ret = PyRun_SimpleStringFlags(PyBytes_AsString(bytes), cf);
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Py_DECREF(bytes);
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return (ret != 0);
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error:
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PySys_WriteStderr("Unable to decode the command from the command line:\n");
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return pymain_exit_err_print();
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}
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static int
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pymain_run_module(const wchar_t *modname, int set_argv0)
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{
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PyObject *module, *runpy, *runmodule, *runargs, *result;
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runpy = PyImport_ImportModule("runpy");
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if (runpy == NULL) {
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fprintf(stderr, "Could not import runpy module\n");
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return pymain_exit_err_print();
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}
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runmodule = PyObject_GetAttrString(runpy, "_run_module_as_main");
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if (runmodule == NULL) {
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fprintf(stderr, "Could not access runpy._run_module_as_main\n");
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Py_DECREF(runpy);
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return pymain_exit_err_print();
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}
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module = PyUnicode_FromWideChar(modname, wcslen(modname));
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if (module == NULL) {
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fprintf(stderr, "Could not convert module name to unicode\n");
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Py_DECREF(runpy);
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Py_DECREF(runmodule);
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return pymain_exit_err_print();
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}
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runargs = Py_BuildValue("(Oi)", module, set_argv0);
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if (runargs == NULL) {
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fprintf(stderr,
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"Could not create arguments for runpy._run_module_as_main\n");
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Py_DECREF(runpy);
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Py_DECREF(runmodule);
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Py_DECREF(module);
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return pymain_exit_err_print();
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}
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result = PyObject_Call(runmodule, runargs, NULL);
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Py_DECREF(runpy);
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Py_DECREF(runmodule);
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Py_DECREF(module);
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Py_DECREF(runargs);
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if (result == NULL) {
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return pymain_exit_err_print();
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}
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Py_DECREF(result);
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return 0;
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}
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static int
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pymain_run_file(_PyCoreConfig *config, PyCompilerFlags *cf)
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{
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const wchar_t *filename = config->run_filename;
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FILE *fp = _Py_wfopen(filename, L"rb");
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if (fp == NULL) {
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char *cfilename_buffer;
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const char *cfilename;
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int err = errno;
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cfilename_buffer = _Py_EncodeLocaleRaw(filename, NULL);
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if (cfilename_buffer != NULL)
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cfilename = cfilename_buffer;
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else
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cfilename = "<unprintable file name>";
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fprintf(stderr, "%ls: can't open file '%s': [Errno %d] %s\n",
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config->program_name, cfilename, err, strerror(err));
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PyMem_RawFree(cfilename_buffer);
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return 2;
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}
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if (config->skip_source_first_line) {
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int ch;
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/* Push back first newline so line numbers remain the same */
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while ((ch = getc(fp)) != EOF) {
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if (ch == '\n') {
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(void)ungetc(ch, fp);
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break;
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}
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}
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}
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struct _Py_stat_struct sb;
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if (_Py_fstat_noraise(fileno(fp), &sb) == 0 && S_ISDIR(sb.st_mode)) {
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fprintf(stderr,
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"%ls: '%ls' is a directory, cannot continue\n",
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config->program_name, filename);
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fclose(fp);
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return 1;
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}
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/* call pending calls like signal handlers (SIGINT) */
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if (Py_MakePendingCalls() == -1) {
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fclose(fp);
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return pymain_exit_err_print();
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}
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PyObject *unicode, *bytes = NULL;
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const char *filename_str;
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unicode = PyUnicode_FromWideChar(filename, wcslen(filename));
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if (unicode != NULL) {
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bytes = PyUnicode_EncodeFSDefault(unicode);
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Py_DECREF(unicode);
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}
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if (bytes != NULL) {
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filename_str = PyBytes_AsString(bytes);
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}
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else {
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PyErr_Clear();
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filename_str = "<filename encoding error>";
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}
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/* PyRun_AnyFileExFlags(closeit=1) calls fclose(fp) before running code */
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int run = PyRun_AnyFileExFlags(fp, filename_str, 1, cf);
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Py_XDECREF(bytes);
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return (run != 0);
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}
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static int
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pymain_run_startup(_PyCoreConfig *config, PyCompilerFlags *cf, int *exitcode)
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{
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const char *startup = _Py_GetEnv(config->use_environment, "PYTHONSTARTUP");
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if (startup == NULL) {
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return 0;
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}
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FILE *fp = _Py_fopen(startup, "r");
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if (fp == NULL) {
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int save_errno = errno;
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PySys_WriteStderr("Could not open PYTHONSTARTUP\n");
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errno = save_errno;
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PyErr_SetFromErrnoWithFilename(PyExc_OSError, startup);
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return pymain_err_print(exitcode);
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}
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(void) PyRun_SimpleFileExFlags(fp, startup, 0, cf);
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PyErr_Clear();
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fclose(fp);
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return 0;
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}
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/* Write an exitcode into *exitcode and return 1 if we have to exit Python.
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Return 0 otherwise. */
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static int
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pymain_run_interactive_hook(int *exitcode)
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{
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PyObject *sys, *hook, *result;
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sys = PyImport_ImportModule("sys");
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if (sys == NULL) {
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goto error;
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}
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hook = PyObject_GetAttrString(sys, "__interactivehook__");
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Py_DECREF(sys);
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if (hook == NULL) {
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PyErr_Clear();
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return 0;
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}
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result = _PyObject_CallNoArg(hook);
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Py_DECREF(hook);
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if (result == NULL) {
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goto error;
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}
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Py_DECREF(result);
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return 0;
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error:
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PySys_WriteStderr("Failed calling sys.__interactivehook__\n");
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return pymain_err_print(exitcode);
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}
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static int
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pymain_run_stdin(_PyCoreConfig *config, PyCompilerFlags *cf)
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{
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if (stdin_is_interactive(config)) {
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config->inspect = 0;
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Py_InspectFlag = 0; /* do exit on SystemExit */
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int exitcode;
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if (pymain_run_startup(config, cf, &exitcode)) {
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return exitcode;
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}
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if (pymain_run_interactive_hook(&exitcode)) {
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return exitcode;
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}
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}
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/* call pending calls like signal handlers (SIGINT) */
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if (Py_MakePendingCalls() == -1) {
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return pymain_exit_err_print();
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}
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int run = PyRun_AnyFileExFlags(stdin, "<stdin>", 0, cf);
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return (run != 0);
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}
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static void
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pymain_repl(_PyCoreConfig *config, PyCompilerFlags *cf, int *exitcode)
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{
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/* Check this environment variable at the end, to give programs the
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opportunity to set it from Python. */
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if (!config->inspect && _Py_GetEnv(config->use_environment, "PYTHONINSPECT")) {
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config->inspect = 1;
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Py_InspectFlag = 1;
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}
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if (!(config->inspect && stdin_is_interactive(config) && RUN_CODE(config))) {
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return;
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}
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config->inspect = 0;
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Py_InspectFlag = 0;
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if (pymain_run_interactive_hook(exitcode)) {
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return;
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}
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int res = PyRun_AnyFileFlags(stdin, "<stdin>", cf);
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*exitcode = (res != 0);
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}
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static void
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pymain_run_python(int *exitcode)
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{
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PyInterpreterState *interp = _PyInterpreterState_GET_UNSAFE();
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/* pymain_run_stdin() modify the config */
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_PyCoreConfig *config = &interp->core_config;
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PyObject *main_importer_path = NULL;
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if (config->run_filename != NULL) {
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/* If filename is a package (ex: directory or ZIP file) which contains
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__main__.py, main_importer_path is set to filename and will be
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prepended to sys.path.
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Otherwise, main_importer_path is left unchanged. */
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if (pymain_get_importer(config->run_filename, &main_importer_path,
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exitcode)) {
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return;
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}
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}
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if (main_importer_path != NULL) {
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if (pymain_sys_path_add_path0(interp, main_importer_path) < 0) {
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goto error;
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}
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}
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else if (!config->isolated) {
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PyObject *path0 = NULL;
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int res = _PyPathConfig_ComputeSysPath0(&config->argv, &path0);
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if (res < 0) {
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goto error;
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}
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if (res > 0) {
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if (pymain_sys_path_add_path0(interp, path0) < 0) {
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Py_DECREF(path0);
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goto error;
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}
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Py_DECREF(path0);
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}
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}
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PyCompilerFlags cf = {.cf_flags = 0, .cf_feature_version = PY_MINOR_VERSION};
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pymain_header(config);
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pymain_import_readline(config);
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if (config->run_command) {
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*exitcode = pymain_run_command(config->run_command, &cf);
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}
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else if (config->run_module) {
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*exitcode = pymain_run_module(config->run_module, 1);
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}
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else if (main_importer_path != NULL) {
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*exitcode = pymain_run_module(L"__main__", 0);
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}
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else if (config->run_filename != NULL) {
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*exitcode = pymain_run_file(config, &cf);
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}
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else {
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*exitcode = pymain_run_stdin(config, &cf);
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}
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pymain_repl(config, &cf, exitcode);
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goto done;
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error:
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*exitcode = pymain_exit_err_print();
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done:
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Py_XDECREF(main_importer_path);
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}
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/* --- pymain_main() ---------------------------------------------- */
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static void
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pymain_free(void)
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{
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_PyImport_Fini2();
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/* Free global variables which cannot be freed in Py_Finalize():
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configuration options set before Py_Initialize() which should
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remain valid after Py_Finalize(), since
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Py_Initialize()-Py_Finalize() can be called multiple times. */
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_PyPathConfig_ClearGlobal();
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_Py_ClearStandardStreamEncoding();
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_Py_ClearArgcArgv();
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_PyRuntime_Finalize();
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}
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static int
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exit_sigint(void)
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{
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/* bpo-1054041: We need to exit via the
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* SIG_DFL handler for SIGINT if KeyboardInterrupt went unhandled.
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* If we don't, a calling process such as a shell may not know
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* about the user's ^C. https://www.cons.org/cracauer/sigint.html */
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#if defined(HAVE_GETPID) && !defined(MS_WINDOWS)
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if (PyOS_setsig(SIGINT, SIG_DFL) == SIG_ERR) {
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perror("signal"); /* Impossible in normal environments. */
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} else {
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kill(getpid(), SIGINT);
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}
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/* If setting SIG_DFL failed, or kill failed to terminate us,
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* there isn't much else we can do aside from an error code. */
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#endif /* HAVE_GETPID && !MS_WINDOWS */
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#ifdef MS_WINDOWS
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/* cmd.exe detects this, prints ^C, and offers to terminate. */
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/* https://msdn.microsoft.com/en-us/library/cc704588.aspx */
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return STATUS_CONTROL_C_EXIT;
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#else
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return SIGINT + 128;
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#endif /* !MS_WINDOWS */
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}
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static void _Py_NO_RETURN
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pymain_exit_error(_PyInitError err)
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{
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if (_Py_INIT_IS_EXIT(err)) {
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/* If it's an error rather than a regular exit, leave Python runtime
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alive: _Py_ExitInitError() uses the current exception and use
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sys.stdout in this case. */
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pymain_free();
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}
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_Py_ExitInitError(err);
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}
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int
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_Py_RunMain(void)
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{
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int exitcode = 0;
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pymain_run_python(&exitcode);
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if (Py_FinalizeEx() < 0) {
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/* Value unlikely to be confused with a non-error exit status or
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other special meaning */
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exitcode = 120;
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}
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pymain_free();
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if (_Py_UnhandledKeyboardInterrupt) {
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exitcode = exit_sigint();
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}
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return exitcode;
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}
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static int
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pymain_main(_PyArgv *args)
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{
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_PyInitError err = pymain_init(args);
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if (_Py_INIT_IS_EXIT(err)) {
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pymain_free();
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return err.exitcode;
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}
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if (_Py_INIT_FAILED(err)) {
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pymain_exit_error(err);
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}
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return _Py_RunMain();
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}
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int
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Py_Main(int argc, wchar_t **argv)
|
|
{
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_PyArgv args = {
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.argc = argc,
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.use_bytes_argv = 0,
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.bytes_argv = NULL,
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.wchar_argv = argv};
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return pymain_main(&args);
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}
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int
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|
_Py_UnixMain(int argc, char **argv)
|
|
{
|
|
_PyArgv args = {
|
|
.argc = argc,
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|
.use_bytes_argv = 1,
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|
.bytes_argv = argv,
|
|
.wchar_argv = NULL};
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return pymain_main(&args);
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}
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#ifdef __cplusplus
|
|
}
|
|
#endif
|