cpython/Python/sysmodule.c at master · Techlord-RCE/cpython · GitHub

History

2508 lines (2214 loc) · 72.2 KB

Raw

100

101

102

103

104

105

106

107

108

109

110

111

112

113

114

115

116

117

118

119

120

121

122

123

124

125

126

127

128

129

130

131

132

133

134

135

136

137

138

139

140

141

142

143

144

145

146

147

148

149

150

151

152

153

154

155

156

157

158

159

160

161

162

163

164

165

166

167

168

169

170

171

172

173

174

175

176

177

178

179

180

181

182

183

184

185

186

187

188

189

190

191

192

193

194

195

196

197

198

199

200

201

202

203

204

205

206

207

208

209

210

211

212

213

214

215

216

217

218

219

220

221

222

223

224

225

226

227

228

229

230

231

232

233

234

235

236

237

238

239

240

241

242

243

244

245

246

247

248

249

250

251

252

253

254

255

256

257

258

259

260

261

262

263

264

265

266

267

268

269

270

271

272

273

274

275

276

277

278

279

280

281

282

283

284

285

286

287

288

289

290

291

292

293

294

295

296

297

298

299

300

301

302

303

304

305

306

307

308

309

310

311

312

313

314

315

316

317

318

319

320

321

322

323

324

325

326

327

328

329

330

331

332

333

334

335

336

337

338

339

340

341

342

343

344

345

346

347

348

349

350

351

352

353

354

355

356

357

358

359

360

361

362

363

364

365

366

367

368

369

370

371

372

373

374

375

376

377

378

379

380

381

382

383

384

385

386

387

388

389

390

391

392

393

394

395

396

397

398

399

400

401

402

403

404

405

406

407

408

409

410

411

412

413

414

415

416

417

418

419

420

421

422

423

424

425

426

427

428

429

430

431

432

433

434

435

436

437

438

439

440

441

442

443

444

445

446

447

448

449

450

451

452

453

454

455

456

457

458

459

460

461

462

463

464

465

466

467

468

469

470

471

472

473

474

475

476

477

478

479

480

481

482

483

484

485

486

487

488

489

490

491

492

493

494

495

496

497

498

499

500

501

502

503

504

505

506

507

508

509

510

511

512

513

514

515

516

517

518

519

520

521

522

523

524

525

526

527

528

529

530

531

532

533

534

535

536

537

538

539

540

541

542

543

544

545

546

547

548

549

550

551

552

553

554

555

556

557

558

559

560

561

562

563

564

565

566

567

568

569

570

571

572

573

574

575

576

577

578

579

580

581

582

583

584

585

586

587

588

589

590

591

592

593

594

595

596

597

598

599

600

601

602

603

604

605

606

607

608

609

610

611

612

613

614

615

616

617

618

619

620

621

622

623

624

625

626

627

628

629

630

631

632

633

634

635

636

637

638

639

640

641

642

643

644

645

646

647

648

649

650

651

652

653

654

655

656

657

658

659

660

661

662

663

664

665

666

667

668

669

670

671

672

673

674

675

676

677

678

679

680

681

682

683

684

685

686

687

688

689

690

691

692

693

694

695

696

697

698

699

700

701

702

703

704

705

706

707

708

709

710

711

712

713

714

715

716

717

718

719

720

721

722

723

724

725

726

727

728

729

730

731

732

733

734

735

736

737

738

739

740

741

742

743

744

745

746

747

748

749

750

751

752

753

754

755

756

757

758

759

760

761

762

763

764

765

766

767

768

769

770

771

772

773

774

775

776

777

778

779

780

781

782

783

784

785

786

787

788

789

790

791

792

793

794

795

796

797

798

799

800

801

802

803

804

805

806

807

808

809

810

811

812

813

814

815

816

817

818

819

820

821

822

823

824

825

826

827

828

829

830

831

832

833

834

835

836

837

838

839

840

841

842

843

844

845

846

847

848

849

850

851

852

853

854

855

856

857

858

859

860

861

862

863

864

865

866

867

868

869

870

871

872

873

874

875

876

877

878

879

880

881

882

883

884

885

886

887

888

889

890

891

892

893

894

895

896

897

898

899

900

901

902

903

904

905

906

907

908

909

910

911

912

913

914

915

916

917

918

919

920

921

922

923

924

925

926

927

928

929

930

931

932

933

934

935

936

937

938

939

940

941

942

943

944

945

946

947

948

949

950

951

952

953

954

955

956

957

958

959

960

961

962

963

964

965

966

967

968

969

970

971

972

973

974

975

976

977

978

979

980

981

982

983

984

985

986

987

988

989

990

991

992

993

994

995

996

997

998

999

1000

/* System module */

Various bits of information used by the interpreter are collected in

module 'sys'.

Function member:

- exit(sts): raise SystemExit

Data members:

- stdin, stdout, stderr: standard file objects

- modules: the table of modules (dictionary)

- path: module search path (list of strings)

- argv: script arguments (list of strings)

- ps1, ps2: optional primary and secondary prompts (strings)

#include "Python.h"

#include "code.h"

#include "frameobject.h"

#include "pythread.h"

#include "osdefs.h"

#include <locale.h>

#ifdef MS_WINDOWS

#define WIN32_LEAN_AND_MEAN

#include <windows.h>

#endif /* MS_WINDOWS */

#ifdef MS_COREDLL

extern void *PyWin_DLLhModule;

/* A string loaded from the DLL at startup: */

extern const char *PyWin_DLLVersionString;

#endif

_Py_IDENTIFIER(_);

_Py_IDENTIFIER(__sizeof__);

_Py_IDENTIFIER(buffer);

_Py_IDENTIFIER(builtins);

_Py_IDENTIFIER(encoding);

_Py_IDENTIFIER(path);

_Py_IDENTIFIER(stdout);

_Py_IDENTIFIER(stderr);

_Py_IDENTIFIER(write);

PyObject *

_PySys_GetObjectId(_Py_Identifier *key)

{

PyThreadState *tstate = PyThreadState_GET();

PyObject *sd = tstate->interp->sysdict;

if (sd == NULL)

return NULL;

return _PyDict_GetItemId(sd, key);

}

PyObject *

PySys_GetObject(const char *name)

{

PyThreadState *tstate = PyThreadState_GET();

PyObject *sd = tstate->interp->sysdict;

if (sd == NULL)

return NULL;

return PyDict_GetItemString(sd, name);

}

int

_PySys_SetObjectId(_Py_Identifier *key, PyObject *v)

{

PyThreadState *tstate = PyThreadState_GET();

PyObject *sd = tstate->interp->sysdict;

if (v == NULL) {

if (_PyDict_GetItemId(sd, key) == NULL)

return 0;

else

return _PyDict_DelItemId(sd, key);

}

else

return _PyDict_SetItemId(sd, key, v);

}

int

PySys_SetObject(const char *name, PyObject *v)

{

PyThreadState *tstate = PyThreadState_GET();

PyObject *sd = tstate->interp->sysdict;

if (v == NULL) {

if (PyDict_GetItemString(sd, name) == NULL)

return 0;

else

return PyDict_DelItemString(sd, name);

}

else

return PyDict_SetItemString(sd, name, v);

}

/* Write repr(o) to sys.stdout using sys.stdout.encoding and 'backslashreplace'

error handler. If sys.stdout has a buffer attribute, use

sys.stdout.buffer.write(encoded), otherwise redecode the string and use

sys.stdout.write(redecoded).

Helper function for sys_displayhook(). */

static int

sys_displayhook_unencodable(PyObject *outf, PyObject *o)

{

PyObject *stdout_encoding = NULL;

PyObject *encoded, *escaped_str, *repr_str, *buffer, *result;

const char *stdout_encoding_str;

int ret;

stdout_encoding = _PyObject_GetAttrId(outf, &PyId_encoding);

if (stdout_encoding == NULL)

goto error;

stdout_encoding_str = PyUnicode_AsUTF8(stdout_encoding);

if (stdout_encoding_str == NULL)

goto error;

repr_str = PyObject_Repr(o);

if (repr_str == NULL)

goto error;

encoded = PyUnicode_AsEncodedString(repr_str,

stdout_encoding_str,

"backslashreplace");

Py_DECREF(repr_str);

if (encoded == NULL)

goto error;

buffer = _PyObject_GetAttrId(outf, &PyId_buffer);

if (buffer) {

result = _PyObject_CallMethodIdObjArgs(buffer, &PyId_write, encoded, NULL);

Py_DECREF(buffer);

Py_DECREF(encoded);

if (result == NULL)

goto error;

Py_DECREF(result);

}

else {

PyErr_Clear();

escaped_str = PyUnicode_FromEncodedObject(encoded,

stdout_encoding_str,

"strict");

Py_DECREF(encoded);

if (PyFile_WriteObject(escaped_str, outf, Py_PRINT_RAW) != 0) {

Py_DECREF(escaped_str);

goto error;

}

Py_DECREF(escaped_str);

}

ret = 0;

goto finally;

error:

ret = -1;

finally:

Py_XDECREF(stdout_encoding);

return ret;

}

static PyObject *

sys_displayhook(PyObject *self, PyObject *o)

{

PyObject *outf;

PyInterpreterState *interp = PyThreadState_GET()->interp;

PyObject *modules = interp->modules;

PyObject *builtins;

static PyObject *newline = NULL;

int err;

builtins = _PyDict_GetItemId(modules, &PyId_builtins);

if (builtins == NULL) {

PyErr_SetString(PyExc_RuntimeError, "lost builtins module");

return NULL;

}

/* Print value except if None */

/* After printing, also assign to '_' */

/* Before, set '_' to None to avoid recursion */

if (o == Py_None) {

Py_RETURN_NONE;

}

if (_PyObject_SetAttrId(builtins, &PyId__, Py_None) != 0)

return NULL;

outf = _PySys_GetObjectId(&PyId_stdout);

if (outf == NULL || outf == Py_None) {

PyErr_SetString(PyExc_RuntimeError, "lost sys.stdout");

return NULL;

}

if (PyFile_WriteObject(o, outf, 0) != 0) {

if (PyErr_ExceptionMatches(PyExc_UnicodeEncodeError)) {

/* repr(o) is not encodable to sys.stdout.encoding with

* sys.stdout.errors error handler (which is probably 'strict') */

PyErr_Clear();

err = sys_displayhook_unencodable(outf, o);

if (err)

return NULL;

}

else {

return NULL;

}

if (newline == NULL) {

newline = PyUnicode_FromString("\n");

if (newline == NULL)

return NULL;

}

if (PyFile_WriteObject(newline, outf, Py_PRINT_RAW) != 0)

return NULL;

if (_PyObject_SetAttrId(builtins, &PyId__, o) != 0)

return NULL;

Py_RETURN_NONE;

}

PyDoc_STRVAR(displayhook_doc,

"displayhook(object) -> None\n"

"\n"

"Print an object to sys.stdout and also save it in builtins._\n"

);

static PyObject *

sys_excepthook(PyObject* self, PyObject* args)

{

PyObject *exc, *value, *tb;

if (!PyArg_UnpackTuple(args, "excepthook", 3, 3, &exc, &value, &tb))

return NULL;

PyErr_Display(exc, value, tb);

Py_RETURN_NONE;

}

PyDoc_STRVAR(excepthook_doc,

"excepthook(exctype, value, traceback) -> None\n"

"\n"

"Handle an exception by displaying it with a traceback on sys.stderr.\n"

);

static PyObject *

sys_exc_info(PyObject *self, PyObject *noargs)

{

PyThreadState *tstate;

tstate = PyThreadState_GET();

return Py_BuildValue(

"(OOO)",

tstate->exc_type != NULL ? tstate->exc_type : Py_None,

tstate->exc_value != NULL ? tstate->exc_value : Py_None,

tstate->exc_traceback != NULL ?

tstate->exc_traceback : Py_None);

}

PyDoc_STRVAR(exc_info_doc,

"exc_info() -> (type, value, traceback)\n\

\n\

Return information about the most recent exception caught by an except\n\

clause in the current stack frame or in an older stack frame."

);

static PyObject *

sys_exit(PyObject *self, PyObject *args)

{

PyObject *exit_code = 0;

if (!PyArg_UnpackTuple(args, "exit", 0, 1, &exit_code))

return NULL;

/* Raise SystemExit so callers may catch it or clean up. */

PyErr_SetObject(PyExc_SystemExit, exit_code);

return NULL;

}

PyDoc_STRVAR(exit_doc,

"exit([status])\n\

\n\

Exit the interpreter by raising SystemExit(status).\n\

If the status is omitted or None, it defaults to zero (i.e., success).\n\

If the status is an integer, it will be used as the system exit status.\n\

If it is another kind of object, it will be printed and the system\n\

exit status will be one (i.e., failure)."

);

static PyObject *

sys_getdefaultencoding(PyObject *self)

{

return PyUnicode_FromString(PyUnicode_GetDefaultEncoding());

}

PyDoc_STRVAR(getdefaultencoding_doc,

"getdefaultencoding() -> string\n\

\n\

Return the current default string encoding used by the Unicode \n\

implementation."

);

static PyObject *

sys_getfilesystemencoding(PyObject *self)

{

if (Py_FileSystemDefaultEncoding)

return PyUnicode_FromString(Py_FileSystemDefaultEncoding);

PyErr_SetString(PyExc_RuntimeError,

"filesystem encoding is not initialized");

return NULL;

}

PyDoc_STRVAR(getfilesystemencoding_doc,

"getfilesystemencoding() -> string\n\

\n\

Return the encoding used to convert Unicode filenames in\n\

operating system filenames."

);

static PyObject *

sys_getfilesystemencodeerrors(PyObject *self)

{

if (Py_FileSystemDefaultEncodeErrors)

return PyUnicode_FromString(Py_FileSystemDefaultEncodeErrors);

PyErr_SetString(PyExc_RuntimeError,

"filesystem encoding is not initialized");

return NULL;

}

PyDoc_STRVAR(getfilesystemencodeerrors_doc,

"getfilesystemencodeerrors() -> string\n\

\n\

Return the error mode used to convert Unicode filenames in\n\

operating system filenames."

);

static PyObject *

sys_intern(PyObject *self, PyObject *args)

{

PyObject *s;

if (!PyArg_ParseTuple(args, "U:intern", &s))

return NULL;

if (PyUnicode_CheckExact(s)) {

Py_INCREF(s);

PyUnicode_InternInPlace(&s);

return s;

}

else {

PyErr_Format(PyExc_TypeError,

"can't intern %.400s", s->ob_type->tp_name);

return NULL;

}

PyDoc_STRVAR(intern_doc,

"intern(string) -> string\n\

\n\

``Intern'' the given string. This enters the string in the (global)\n\

table of interned strings whose purpose is to speed up dictionary lookups.\n\

Return the string itself or the previously interned string object with the\n\

same value.");

* Cached interned string objects used for calling the profile and

* trace functions. Initialized by trace_init().

static PyObject *whatstrings[7] = {NULL, NULL, NULL, NULL, NULL, NULL, NULL};

static int

trace_init(void)

{

static const char * const whatnames[7] = {

"call", "exception", "line", "return",

"c_call", "c_exception", "c_return"

};

PyObject *name;

int i;

for (i = 0; i < 7; ++i) {

if (whatstrings[i] == NULL) {

name = PyUnicode_InternFromString(whatnames[i]);

if (name == NULL)

return -1;

whatstrings[i] = name;

}

return 0;

}

static PyObject *

call_trampoline(PyObject* callback,

PyFrameObject *frame, int what, PyObject *arg)

{

PyObject *result;

PyObject *stack[3];

if (PyFrame_FastToLocalsWithError(frame) < 0) {

return NULL;

}

stack[0] = (PyObject *)frame;

stack[1] = whatstrings[what];

stack[2] = (arg != NULL) ? arg : Py_None;

/* call the Python-level function */

result = _PyObject_FastCall(callback, stack, 3);

PyFrame_LocalsToFast(frame, 1);

if (result == NULL) {

PyTraceBack_Here(frame);

}

return result;

}

static int

profile_trampoline(PyObject *self, PyFrameObject *frame,

int what, PyObject *arg)

{

PyObject *result;

if (arg == NULL)

arg = Py_None;

result = call_trampoline(self, frame, what, arg);

if (result == NULL) {

PyEval_SetProfile(NULL, NULL);

return -1;

}

Py_DECREF(result);

return 0;

}

static int

trace_trampoline(PyObject *self, PyFrameObject *frame,

int what, PyObject *arg)

{

PyObject *callback;

PyObject *result;

if (what == PyTrace_CALL)

callback = self;

else

callback = frame->f_trace;

if (callback == NULL)

return 0;

result = call_trampoline(callback, frame, what, arg);

if (result == NULL) {

PyEval_SetTrace(NULL, NULL);

Py_CLEAR(frame->f_trace);

return -1;

}

if (result != Py_None) {

Py_XSETREF(frame->f_trace, result);

}

else {

Py_DECREF(result);

}

return 0;

}

static PyObject *

sys_settrace(PyObject *self, PyObject *args)

{

if (trace_init() == -1)

return NULL;

if (args == Py_None)

PyEval_SetTrace(NULL, NULL);

else

PyEval_SetTrace(trace_trampoline, args);

Py_RETURN_NONE;

}

PyDoc_STRVAR(settrace_doc,

"settrace(function)\n\

\n\

Set the global debug tracing function. It will be called on each\n\

function call. See the debugger chapter in the library manual."

);

static PyObject *

sys_gettrace(PyObject *self, PyObject *args)

{

PyThreadState *tstate = PyThreadState_GET();

PyObject *temp = tstate->c_traceobj;

if (temp == NULL)

temp = Py_None;

Py_INCREF(temp);

return temp;

}

PyDoc_STRVAR(gettrace_doc,

"gettrace()\n\

\n\

Return the global debug tracing function set with sys.settrace.\n\

See the debugger chapter in the library manual."

);

static PyObject *

sys_setprofile(PyObject *self, PyObject *args)

{

if (trace_init() == -1)

return NULL;

if (args == Py_None)

PyEval_SetProfile(NULL, NULL);

else

PyEval_SetProfile(profile_trampoline, args);

Py_RETURN_NONE;

}

PyDoc_STRVAR(setprofile_doc,

"setprofile(function)\n\

\n\

Set the profiling function. It will be called on each function call\n\

and return. See the profiler chapter in the library manual."

);

static PyObject *

sys_getprofile(PyObject *self, PyObject *args)

{

PyThreadState *tstate = PyThreadState_GET();

PyObject *temp = tstate->c_profileobj;

if (temp == NULL)

temp = Py_None;

Py_INCREF(temp);

return temp;

}

PyDoc_STRVAR(getprofile_doc,

"getprofile()\n\

\n\

Return the profiling function set with sys.setprofile.\n\

See the profiler chapter in the library manual."

);

static int _check_interval = 100;

static PyObject *

sys_setcheckinterval(PyObject *self, PyObject *args)

{

if (PyErr_WarnEx(PyExc_DeprecationWarning,

"sys.getcheckinterval() and sys.setcheckinterval() "

"are deprecated. Use sys.setswitchinterval() "

"instead.", 1) < 0)

return NULL;

if (!PyArg_ParseTuple(args, "i:setcheckinterval", &_check_interval))

return NULL;

Py_RETURN_NONE;

}

PyDoc_STRVAR(setcheckinterval_doc,

"setcheckinterval(n)\n\

\n\

Tell the Python interpreter to check for asynchronous events every\n\

n instructions. This also affects how often thread switches occur."

);

static PyObject *

sys_getcheckinterval(PyObject *self, PyObject *args)

{

if (PyErr_WarnEx(PyExc_DeprecationWarning,

"sys.getcheckinterval() and sys.setcheckinterval() "

"are deprecated. Use sys.getswitchinterval() "

"instead.", 1) < 0)

return NULL;

return PyLong_FromLong(_check_interval);

}

PyDoc_STRVAR(getcheckinterval_doc,

"getcheckinterval() -> current check interval; see setcheckinterval()."

);

#ifdef WITH_THREAD

static PyObject *

sys_setswitchinterval(PyObject *self, PyObject *args)

{

double d;

if (!PyArg_ParseTuple(args, "d:setswitchinterval", &d))

return NULL;

if (d <= 0.0) {

PyErr_SetString(PyExc_ValueError,

"switch interval must be strictly positive");

return NULL;

}

_PyEval_SetSwitchInterval((unsigned long) (1e6 * d));

Py_RETURN_NONE;

}

PyDoc_STRVAR(setswitchinterval_doc,

"setswitchinterval(n)\n\

\n\

Set the ideal thread switching delay inside the Python interpreter\n\

The actual frequency of switching threads can be lower if the\n\

interpreter executes long sequences of uninterruptible code\n\

(this is implementation-specific and workload-dependent).\n\

\n\

The parameter must represent the desired switching delay in seconds\n\

A typical value is 0.005 (5 milliseconds)."

);

static PyObject *

sys_getswitchinterval(PyObject *self, PyObject *args)

{

return PyFloat_FromDouble(1e-6 * _PyEval_GetSwitchInterval());

}

PyDoc_STRVAR(getswitchinterval_doc,

"getswitchinterval() -> current thread switch interval; see setswitchinterval()."

);

#endif /* WITH_THREAD */

static PyObject *

sys_setrecursionlimit(PyObject *self, PyObject *args)

{

int new_limit, mark;

PyThreadState *tstate;

if (!PyArg_ParseTuple(args, "i:setrecursionlimit", &new_limit))

return NULL;

if (new_limit < 1) {

PyErr_SetString(PyExc_ValueError,

"recursion limit must be greater or equal than 1");

return NULL;

}

/* Issue #25274: When the recursion depth hits the recursion limit in

_Py_CheckRecursiveCall(), the overflowed flag of the thread state is

set to 1 and a RecursionError is raised. The overflowed flag is reset

to 0 when the recursion depth goes below the low-water mark: see

Py_LeaveRecursiveCall().

Reject too low new limit if the current recursion depth is higher than

the new low-water mark. Otherwise it may not be possible anymore to

reset the overflowed flag to 0. */

mark = _Py_RecursionLimitLowerWaterMark(new_limit);

tstate = PyThreadState_GET();

if (tstate->recursion_depth >= mark) {

PyErr_Format(PyExc_RecursionError,

"cannot set the recursion limit to %i at "

"the recursion depth %i: the limit is too low",

new_limit, tstate->recursion_depth);

return NULL;

}

Py_SetRecursionLimit(new_limit);

Py_RETURN_NONE;

}

static PyObject *

sys_set_coroutine_wrapper(PyObject *self, PyObject *wrapper)

{

if (wrapper != Py_None) {

if (!PyCallable_Check(wrapper)) {

PyErr_Format(PyExc_TypeError,

"callable expected, got %.50s",

Py_TYPE(wrapper)->tp_name);

return NULL;

}

_PyEval_SetCoroutineWrapper(wrapper);

}

else {

_PyEval_SetCoroutineWrapper(NULL);

}

Py_RETURN_NONE;

}

PyDoc_STRVAR(set_coroutine_wrapper_doc,

"set_coroutine_wrapper(wrapper)\n\

\n\

Set a wrapper for coroutine objects."

);

static PyObject *

sys_get_coroutine_wrapper(PyObject *self, PyObject *args)

{

PyObject *wrapper = _PyEval_GetCoroutineWrapper();

if (wrapper == NULL) {

wrapper = Py_None;

}

Py_INCREF(wrapper);

return wrapper;

}

PyDoc_STRVAR(get_coroutine_wrapper_doc,

"get_coroutine_wrapper()\n\

\n\

Return the wrapper for coroutine objects set by sys.set_coroutine_wrapper."

);

static PyTypeObject AsyncGenHooksType;

PyDoc_STRVAR(asyncgen_hooks_doc,

"asyncgen_hooks\n\

\n\

A struct sequence providing information about asynhronous\n\

generators hooks. The attributes are read only.");

static PyStructSequence_Field asyncgen_hooks_fields[] = {

{"firstiter", "Hook to intercept first iteration"},

{"finalizer", "Hook to intercept finalization"},

{0}

};

static PyStructSequence_Desc asyncgen_hooks_desc = {

"asyncgen_hooks", /* name */

asyncgen_hooks_doc, /* doc */

asyncgen_hooks_fields , /* fields */

};

static PyObject *

sys_set_asyncgen_hooks(PyObject *self, PyObject *args, PyObject *kw)

{

static char *keywords[] = {"firstiter", "finalizer", NULL};

PyObject *firstiter = NULL;

PyObject *finalizer = NULL;

if (!PyArg_ParseTupleAndKeywords(

args, kw, "|OO", keywords,

&firstiter, &finalizer)) {

return NULL;

}

if (finalizer && finalizer != Py_None) {

if (!PyCallable_Check(finalizer)) {

PyErr_Format(PyExc_TypeError,

"callable finalizer expected, got %.50s",

Py_TYPE(finalizer)->tp_name);

return NULL;

}

_PyEval_SetAsyncGenFinalizer(finalizer);

}

else if (finalizer == Py_None) {

_PyEval_SetAsyncGenFinalizer(NULL);

}

if (firstiter && firstiter != Py_None) {

if (!PyCallable_Check(firstiter)) {

PyErr_Format(PyExc_TypeError,

"callable firstiter expected, got %.50s",

Py_TYPE(firstiter)->tp_name);

return NULL;

}

_PyEval_SetAsyncGenFirstiter(firstiter);

}

else if (firstiter == Py_None) {

_PyEval_SetAsyncGenFirstiter(NULL);

}

Py_RETURN_NONE;

}

PyDoc_STRVAR(set_asyncgen_hooks_doc,

"set_asyncgen_hooks(*, firstiter=None, finalizer=None)\n\

\n\

Set a finalizer for async generators objects."

);

static PyObject *

sys_get_asyncgen_hooks(PyObject *self, PyObject *args)

{

PyObject *res;

PyObject *firstiter = _PyEval_GetAsyncGenFirstiter();

PyObject *finalizer = _PyEval_GetAsyncGenFinalizer();

res = PyStructSequence_New(&AsyncGenHooksType);

if (res == NULL) {

return NULL;

}

if (firstiter == NULL) {

firstiter = Py_None;

}

if (finalizer == NULL) {

finalizer = Py_None;

}

Py_INCREF(firstiter);

PyStructSequence_SET_ITEM(res, 0, firstiter);

Py_INCREF(finalizer);

PyStructSequence_SET_ITEM(res, 1, finalizer);

return res;

}

PyDoc_STRVAR(get_asyncgen_hooks_doc,

"get_asyncgen_hooks()\n\

\n\

Return a namedtuple of installed asynchronous generators hooks \

(firstiter, finalizer)."

);

static PyTypeObject Hash_InfoType;

PyDoc_STRVAR(hash_info_doc,

"hash_info\n\

\n\

A struct sequence providing parameters used for computing\n\

hashes. The attributes are read only.");

static PyStructSequence_Field hash_info_fields[] = {

{"width", "width of the type used for hashing, in bits"},

{"modulus", "prime number giving the modulus on which the hash "

"function is based"},

{"inf", "value to be used for hash of a positive infinity"},

{"nan", "value to be used for hash of a nan"},

{"imag", "multiplier used for the imaginary part of a complex number"},

{"algorithm", "name of the algorithm for hashing of str, bytes and "

"memoryviews"},

{"hash_bits", "internal output size of hash algorithm"},

{"seed_bits", "seed size of hash algorithm"},

{"cutoff", "small string optimization cutoff"},

{NULL, NULL}

};

static PyStructSequence_Desc hash_info_desc = {

"sys.hash_info",

hash_info_doc,

hash_info_fields,

};

static PyObject *

get_hash_info(void)

{

PyObject *hash_info;

int field = 0;

PyHash_FuncDef *hashfunc;

hash_info = PyStructSequence_New(&Hash_InfoType);

if (hash_info == NULL)

return NULL;

hashfunc = PyHash_GetFuncDef();