python/Modules/posixmodule.c at master · pylee/python · GitHub

History

9022 lines (8094 loc) · 225 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

/* POSIX module implementation */

/* This file is also used for Windows NT/MS-Win and OS/2. In that case the

module actually calls itself 'nt' or 'os2', not 'posix', and a few

functions are either unimplemented or implemented differently. The source

assumes that for Windows NT, the macro 'MS_WINDOWS' is defined independent

of the compiler used. Different compilers define their own feature

test macro, e.g. '__BORLANDC__' or '_MSC_VER'. For OS/2, the compiler

independent macro PYOS_OS2 should be defined. On OS/2 the default

compiler is assumed to be IBM's VisualAge C++ (VACPP). PYCC_GCC is used

as the compiler specific macro for the EMX port of gcc to OS/2. */

/* See also ../Dos/dosmodule.c */

#ifdef __APPLE__

* Step 1 of support for weak-linking a number of symbols existing on

* OSX 10.4 and later, see the comment in the #ifdef __APPLE__ block

* at the end of this file for more information.

# pragma weak lchown

# pragma weak statvfs

# pragma weak fstatvfs

#endif /* __APPLE__ */

#define PY_SSIZE_T_CLEAN

#include "Python.h"

#include "structseq.h"

#if defined(__VMS)

# include <unixio.h>

#endif /* defined(__VMS) */

#ifdef __cplusplus

extern "C" {

#endif

PyDoc_STRVAR(posix__doc__,

"This module provides access to operating system functionality that is\n\

standardized by the C Standard and the POSIX standard (a thinly\n\

disguised Unix interface). Refer to the library manual and\n\

corresponding Unix manual entries for more information on calls.");

#ifndef Py_USING_UNICODE

/* This is used in signatures of functions. */

#define Py_UNICODE void

#endif

#if defined(PYOS_OS2)

#define INCL_DOS

#define INCL_DOSERRORS

#define INCL_DOSPROCESS

#define INCL_NOPMAPI

#include <os2.h>

#if defined(PYCC_GCC)

#include <ctype.h>

#include <io.h>

#include <stdio.h>

#include <process.h>

#endif

#include "osdefs.h"

#endif

#ifdef HAVE_SYS_TYPES_H

#include <sys/types.h>

#endif /* HAVE_SYS_TYPES_H */

#ifdef HAVE_SYS_STAT_H

#include <sys/stat.h>

#endif /* HAVE_SYS_STAT_H */

#ifdef HAVE_SYS_WAIT_H

#include <sys/wait.h> /* For WNOHANG */

#endif

#ifdef HAVE_SIGNAL_H

#include <signal.h>

#endif

#ifdef HAVE_FCNTL_H

#include <fcntl.h>

#endif /* HAVE_FCNTL_H */

#ifdef HAVE_GRP_H

#include <grp.h>

#endif

#ifdef HAVE_SYSEXITS_H

#include <sysexits.h>

#endif /* HAVE_SYSEXITS_H */

#ifdef HAVE_SYS_LOADAVG_H

#include <sys/loadavg.h>

#endif

/* Various compilers have only certain posix functions */

/* XXX Gosh I wish these were all moved into pyconfig.h */

#if defined(PYCC_VACPP) && defined(PYOS_OS2)

#include <process.h>

#else

#if defined(__WATCOMC__) && !defined(__QNX__) /* Watcom compiler */

#define HAVE_GETCWD 1

#define HAVE_OPENDIR 1

#define HAVE_SYSTEM 1

#if defined(__OS2__)

#define HAVE_EXECV 1

#define HAVE_WAIT 1

#endif

#include <process.h>

#else

#ifdef __BORLANDC__ /* Borland compiler */

#define HAVE_EXECV 1

#define HAVE_GETCWD 1

#define HAVE_OPENDIR 1

#define HAVE_PIPE 1

#define HAVE_POPEN 1

#define HAVE_SYSTEM 1

#define HAVE_WAIT 1

#else

#ifdef _MSC_VER /* Microsoft compiler */

#define HAVE_GETCWD 1

#define HAVE_SPAWNV 1

#define HAVE_EXECV 1

#define HAVE_PIPE 1

#define HAVE_POPEN 1

#define HAVE_SYSTEM 1

#define HAVE_CWAIT 1

#define HAVE_FSYNC 1

#define fsync _commit

#else

#if defined(PYOS_OS2) && defined(PYCC_GCC) || defined(__VMS)

/* Everything needed is defined in PC/os2emx/pyconfig.h or vms/pyconfig.h */

#else /* all other compilers */

/* Unix functions that the configure script doesn't check for */

#define HAVE_EXECV 1

#define HAVE_FORK 1

#if defined(__USLC__) && defined(__SCO_VERSION__) /* SCO UDK Compiler */

#define HAVE_FORK1 1

#endif

#define HAVE_GETCWD 1

#define HAVE_GETEGID 1

#define HAVE_GETEUID 1

#define HAVE_GETGID 1

#define HAVE_GETPPID 1

#define HAVE_GETUID 1

#define HAVE_KILL 1

#define HAVE_OPENDIR 1

#define HAVE_PIPE 1

#ifndef __rtems__

#define HAVE_POPEN 1

#endif

#define HAVE_SYSTEM 1

#define HAVE_WAIT 1

#define HAVE_TTYNAME 1

#endif /* PYOS_OS2 && PYCC_GCC && __VMS */

#endif /* _MSC_VER */

#endif /* __BORLANDC__ */

#endif /* ! __WATCOMC__ || __QNX__ */

#endif /* ! __IBMC__ */

#ifndef _MSC_VER

#if defined(__sgi)&&_COMPILER_VERSION>=700

/* declare ctermid_r if compiling with MIPSPro 7.x in ANSI C mode

(default) */

extern char *ctermid_r(char *);

#endif

#ifndef HAVE_UNISTD_H

#if defined(PYCC_VACPP)

extern int mkdir(char *);

#else

#if ( defined(__WATCOMC__) || defined(_MSC_VER) ) && !defined(__QNX__)

extern int mkdir(const char *);

#else

extern int mkdir(const char *, mode_t);

#endif

#if defined(__IBMC__) || defined(__IBMCPP__)

extern int chdir(char *);

extern int rmdir(char *);

#else

extern int chdir(const char *);

extern int rmdir(const char *);

#endif

#ifdef __BORLANDC__

extern int chmod(const char *, int);

#else

extern int chmod(const char *, mode_t);

#endif

/*#ifdef HAVE_FCHMOD

extern int fchmod(int, mode_t);

#endif*/

/*#ifdef HAVE_LCHMOD

extern int lchmod(const char *, mode_t);

#endif*/

extern int chown(const char *, uid_t, gid_t);

extern char *getcwd(char *, int);

extern char *strerror(int);

extern int link(const char *, const char *);

extern int rename(const char *, const char *);

extern int stat(const char *, struct stat *);

extern int unlink(const char *);

extern int pclose(FILE *);

#ifdef HAVE_SYMLINK

extern int symlink(const char *, const char *);

#endif /* HAVE_SYMLINK */

#ifdef HAVE_LSTAT

extern int lstat(const char *, struct stat *);

#endif /* HAVE_LSTAT */

#endif /* !HAVE_UNISTD_H */

#endif /* !_MSC_VER */

#ifdef HAVE_UTIME_H

#include <utime.h>

#endif /* HAVE_UTIME_H */

#ifdef HAVE_SYS_UTIME_H

#include <sys/utime.h>

#define HAVE_UTIME_H /* pretend we do for the rest of this file */

#endif /* HAVE_SYS_UTIME_H */

#ifdef HAVE_SYS_TIMES_H

#include <sys/times.h>

#endif /* HAVE_SYS_TIMES_H */

#ifdef HAVE_SYS_PARAM_H

#include <sys/param.h>

#endif /* HAVE_SYS_PARAM_H */

#ifdef HAVE_SYS_UTSNAME_H

#include <sys/utsname.h>

#endif /* HAVE_SYS_UTSNAME_H */

#ifdef HAVE_DIRENT_H

#include <dirent.h>

#define NAMLEN(dirent) strlen((dirent)->d_name)

#else

#if defined(__WATCOMC__) && !defined(__QNX__)

#include <direct.h>

#define NAMLEN(dirent) strlen((dirent)->d_name)

#else

#define dirent direct

#define NAMLEN(dirent) (dirent)->d_namlen

#endif

#ifdef HAVE_SYS_NDIR_H

#include <sys/ndir.h>

#endif

#ifdef HAVE_SYS_DIR_H

#include <sys/dir.h>

#endif

#ifdef HAVE_NDIR_H

#include <ndir.h>

#endif

#ifdef _MSC_VER

#ifdef HAVE_DIRECT_H

#include <direct.h>

#endif

#ifdef HAVE_IO_H

#include <io.h>

#endif

#ifdef HAVE_PROCESS_H

#include <process.h>

#endif

#include "osdefs.h"

#include <windows.h>

#include <shellapi.h> /* for ShellExecute() */

#define popen _popen

#define pclose _pclose

#endif /* _MSC_VER */

#if defined(PYCC_VACPP) && defined(PYOS_OS2)

#include <io.h>

#endif /* OS2 */

#ifndef MAXPATHLEN

#if defined(PATH_MAX) && PATH_MAX > 1024

#define MAXPATHLEN PATH_MAX

#else

#define MAXPATHLEN 1024

#endif

#endif /* MAXPATHLEN */

#ifdef UNION_WAIT

/* Emulate some macros on systems that have a union instead of macros */

#ifndef WIFEXITED

#define WIFEXITED(u_wait) (!(u_wait).w_termsig && !(u_wait).w_coredump)

#endif

#ifndef WEXITSTATUS

#define WEXITSTATUS(u_wait) (WIFEXITED(u_wait)?((u_wait).w_retcode):-1)

#endif

#ifndef WTERMSIG

#define WTERMSIG(u_wait) ((u_wait).w_termsig)

#endif

#define WAIT_TYPE union wait

#define WAIT_STATUS_INT(s) (s.w_status)

#else /* !UNION_WAIT */

#define WAIT_TYPE int

#define WAIT_STATUS_INT(s) (s)

#endif /* UNION_WAIT */

/* Don't use the "_r" form if we don't need it (also, won't have a

prototype for it, at least on Solaris -- maybe others as well?). */

#if defined(HAVE_CTERMID_R) && defined(WITH_THREAD)

#define USE_CTERMID_R

#endif

#if defined(HAVE_TMPNAM_R) && defined(WITH_THREAD)

#define USE_TMPNAM_R

#endif

/* choose the appropriate stat and fstat functions and return structs */

#undef STAT

#if defined(MS_WIN64) || defined(MS_WINDOWS)

# define STAT win32_stat

# define FSTAT win32_fstat

# define STRUCT_STAT struct win32_stat

#else

# define STAT stat

# define FSTAT fstat

# define STRUCT_STAT struct stat

#endif

#if defined(MAJOR_IN_MKDEV)

#include <sys/mkdev.h>

#else

#if defined(MAJOR_IN_SYSMACROS)

#include <sys/sysmacros.h>

#endif

#if defined(HAVE_MKNOD) && defined(HAVE_SYS_MKDEV_H)

#include <sys/mkdev.h>

#endif

/* Return a dictionary corresponding to the POSIX environment table */

#ifdef WITH_NEXT_FRAMEWORK

/* On Darwin/MacOSX a shared library or framework has no access to

** environ directly, we must obtain it with _NSGetEnviron().

#include <crt_externs.h>

static char **environ;

#elif !defined(_MSC_VER) && ( !defined(__WATCOMC__) || defined(__QNX__) )

extern char **environ;

#endif /* !_MSC_VER */

static PyObject *

convertenviron(void)

{

PyObject *d;

char **e;

d = PyDict_New();

if (d == NULL)

return NULL;

#ifdef WITH_NEXT_FRAMEWORK

if (environ == NULL)

environ = *_NSGetEnviron();

#endif

if (environ == NULL)

return d;

/* This part ignores errors */

for (e = environ; *e != NULL; e++) {

PyObject *k;

PyObject *v;

char *p = strchr(*e, '=');

if (p == NULL)

continue;

k = PyString_FromStringAndSize(*e, (int)(p-*e));

if (k == NULL) {

PyErr_Clear();

continue;

}

v = PyString_FromString(p+1);

if (v == NULL) {

PyErr_Clear();

Py_DECREF(k);

continue;

}

if (PyDict_GetItem(d, k) == NULL) {

if (PyDict_SetItem(d, k, v) != 0)

PyErr_Clear();

}

Py_DECREF(k);

Py_DECREF(v);

}

#if defined(PYOS_OS2)

{

APIRET rc;

char buffer[1024]; /* OS/2 Provides a Documented Max of 1024 Chars */

rc = DosQueryExtLIBPATH(buffer, BEGIN_LIBPATH);

if (rc == NO_ERROR) { /* (not a type, envname is NOT 'BEGIN_LIBPATH') */

PyObject *v = PyString_FromString(buffer);

PyDict_SetItemString(d, "BEGINLIBPATH", v);

Py_DECREF(v);

}

rc = DosQueryExtLIBPATH(buffer, END_LIBPATH);

if (rc == NO_ERROR) { /* (not a typo, envname is NOT 'END_LIBPATH') */

PyObject *v = PyString_FromString(buffer);

PyDict_SetItemString(d, "ENDLIBPATH", v);

Py_DECREF(v);

}

#endif

return d;

}

/* Set a POSIX-specific error from errno, and return NULL */

static PyObject *

posix_error(void)

{

return PyErr_SetFromErrno(PyExc_OSError);

}

static PyObject *

posix_error_with_filename(char* name)

{

return PyErr_SetFromErrnoWithFilename(PyExc_OSError, name);

}

#ifdef Py_WIN_WIDE_FILENAMES

static PyObject *

posix_error_with_unicode_filename(Py_UNICODE* name)

{

return PyErr_SetFromErrnoWithUnicodeFilename(PyExc_OSError, name);

}

#endif /* Py_WIN_WIDE_FILENAMES */

static PyObject *

posix_error_with_allocated_filename(char* name)

{

PyObject *rc = PyErr_SetFromErrnoWithFilename(PyExc_OSError, name);

PyMem_Free(name);

return rc;

}

#ifdef MS_WINDOWS

static PyObject *

win32_error(char* function, char* filename)

{

/* XXX We should pass the function name along in the future.

(_winreg.c also wants to pass the function name.)

This would however require an additional param to the

Windows error object, which is non-trivial.

errno = GetLastError();

if (filename)

return PyErr_SetFromWindowsErrWithFilename(errno, filename);

else

return PyErr_SetFromWindowsErr(errno);

}

#ifdef Py_WIN_WIDE_FILENAMES

static PyObject *

win32_error_unicode(char* function, Py_UNICODE* filename)

{

/* XXX - see win32_error for comments on 'function' */

errno = GetLastError();

if (filename)

return PyErr_SetFromWindowsErrWithUnicodeFilename(errno, filename);

else

return PyErr_SetFromWindowsErr(errno);

}

static int

convert_to_unicode(PyObject **param)

{

if (PyUnicode_CheckExact(*param))

Py_INCREF(*param);

else if (PyUnicode_Check(*param))

/* For a Unicode subtype that's not a Unicode object,

return a true Unicode object with the same data. */

*param = PyUnicode_FromUnicode(PyUnicode_AS_UNICODE(*param),

PyUnicode_GET_SIZE(*param));

else

*param = PyUnicode_FromEncodedObject(*param,

Py_FileSystemDefaultEncoding,

"strict");

return (*param) != NULL;

}

#endif /* Py_WIN_WIDE_FILENAMES */

#endif

#if defined(PYOS_OS2)

/**********************************************************************

* Helper Function to Trim and Format OS/2 Messages

**********************************************************************/

static void

os2_formatmsg(char *msgbuf, int msglen, char *reason)

{

msgbuf[msglen] = '\0'; /* OS/2 Doesn't Guarantee a Terminator */

if (strlen(msgbuf) > 0) { /* If Non-Empty Msg, Trim CRLF */

char *lastc = &msgbuf[ strlen(msgbuf)-1 ];

while (lastc > msgbuf && isspace(Py_CHARMASK(*lastc)))

*lastc-- = '\0'; /* Trim Trailing Whitespace (CRLF) */

}

/* Add Optional Reason Text */

if (reason) {

strcat(msgbuf, " : ");

strcat(msgbuf, reason);

}

/**********************************************************************

* Decode an OS/2 Operating System Error Code

* A convenience function to lookup an OS/2 error code and return a

* text message we can use to raise a Python exception.

* Notes:

* The messages for errors returned from the OS/2 kernel reside in

* the file OSO001.MSG in the \OS2 directory hierarchy.

**********************************************************************/

static char *

os2_strerror(char *msgbuf, int msgbuflen, int errorcode, char *reason)

{

APIRET rc;

ULONG msglen;

/* Retrieve Kernel-Related Error Message from OSO001.MSG File */

Py_BEGIN_ALLOW_THREADS

rc = DosGetMessage(NULL, 0, msgbuf, msgbuflen,

errorcode, "oso001.msg", &msglen);

Py_END_ALLOW_THREADS

if (rc == NO_ERROR)

os2_formatmsg(msgbuf, msglen, reason);

else

PyOS_snprintf(msgbuf, msgbuflen,

"unknown OS error #%d", errorcode);

return msgbuf;

}

/* Set an OS/2-specific error and return NULL. OS/2 kernel

errors are not in a global variable e.g. 'errno' nor are

they congruent with posix error numbers. */

static PyObject * os2_error(int code)

{

char text[1024];

PyObject *v;

os2_strerror(text, sizeof(text), code, "");

v = Py_BuildValue("(is)", code, text);

if (v != NULL) {

PyErr_SetObject(PyExc_OSError, v);

Py_DECREF(v);

}

return NULL; /* Signal to Python that an Exception is Pending */

}

#endif /* OS2 */

/* POSIX generic methods */

static PyObject *

posix_fildes(PyObject *fdobj, int (*func)(int))

{

int fd;

int res;

fd = PyObject_AsFileDescriptor(fdobj);

if (fd < 0)

return NULL;

Py_BEGIN_ALLOW_THREADS

res = (*func)(fd);

Py_END_ALLOW_THREADS

if (res < 0)

return posix_error();

Py_INCREF(Py_None);

return Py_None;

}

#ifdef Py_WIN_WIDE_FILENAMES

static int

unicode_file_names(void)

{

static int canusewide = -1;

if (canusewide == -1) {

/* As per doc for ::GetVersion(), this is the correct test for

the Windows NT family. */

canusewide = (GetVersion() < 0x80000000) ? 1 : 0;

}

return canusewide;

}

#endif

static PyObject *

posix_1str(PyObject *args, char *format, int (*func)(const char*))

{

char *path1 = NULL;

int res;

if (!PyArg_ParseTuple(args, format,

Py_FileSystemDefaultEncoding, &path1))

return NULL;

Py_BEGIN_ALLOW_THREADS

res = (*func)(path1);

Py_END_ALLOW_THREADS

if (res < 0)

return posix_error_with_allocated_filename(path1);

PyMem_Free(path1);

Py_INCREF(Py_None);

return Py_None;

}

static PyObject *

posix_2str(PyObject *args,

char *format,

int (*func)(const char *, const char *))

{

char *path1 = NULL, *path2 = NULL;

int res;

if (!PyArg_ParseTuple(args, format,

Py_FileSystemDefaultEncoding, &path1,

Py_FileSystemDefaultEncoding, &path2))

return NULL;

Py_BEGIN_ALLOW_THREADS

res = (*func)(path1, path2);

Py_END_ALLOW_THREADS

PyMem_Free(path1);

PyMem_Free(path2);

if (res != 0)

/* XXX how to report both path1 and path2??? */

return posix_error();

Py_INCREF(Py_None);

return Py_None;

}

#ifdef Py_WIN_WIDE_FILENAMES

static PyObject*

win32_1str(PyObject* args, char* func,

char* format, BOOL (__stdcall *funcA)(LPCSTR),

char* wformat, BOOL (__stdcall *funcW)(LPWSTR))

{

PyObject *uni;

char *ansi;

BOOL result;

if (unicode_file_names()) {

if (!PyArg_ParseTuple(args, wformat, &uni))

PyErr_Clear();

else {

Py_BEGIN_ALLOW_THREADS

result = funcW(PyUnicode_AsUnicode(uni));

Py_END_ALLOW_THREADS

if (!result)

return win32_error_unicode(func, PyUnicode_AsUnicode(uni));

Py_INCREF(Py_None);

return Py_None;

}

if (!PyArg_ParseTuple(args, format, &ansi))

return NULL;

Py_BEGIN_ALLOW_THREADS

result = funcA(ansi);

Py_END_ALLOW_THREADS

if (!result)

return win32_error(func, ansi);

Py_INCREF(Py_None);

return Py_None;

}

/* This is a reimplementation of the C library's chdir function,

but one that produces Win32 errors instead of DOS error codes.

chdir is essentially a wrapper around SetCurrentDirectory; however,

it also needs to set "magic" environment variables indicating

the per-drive current directory, which are of the form =<drive>: */

static BOOL __stdcall

win32_chdir(LPCSTR path)

{

char new_path[MAX_PATH+1];

int result;

char env[4] = "=x:";

if(!SetCurrentDirectoryA(path))

return FALSE;

result = GetCurrentDirectoryA(MAX_PATH+1, new_path);

if (!result)

return FALSE;

/* In the ANSI API, there should not be any paths longer

than MAX_PATH. */

assert(result <= MAX_PATH+1);

if (strncmp(new_path, "\\\\", 2) == 0 ||

strncmp(new_path, "//", 2) == 0)

/* UNC path, nothing to do. */

return TRUE;

env[1] = new_path[0];

return SetEnvironmentVariableA(env, new_path);

}

/* The Unicode version differs from the ANSI version

since the current directory might exceed MAX_PATH characters */

static BOOL __stdcall

win32_wchdir(LPCWSTR path)

{

wchar_t _new_path[MAX_PATH+1], *new_path = _new_path;

int result;

wchar_t env[4] = L"=x:";

if(!SetCurrentDirectoryW(path))

return FALSE;

result = GetCurrentDirectoryW(MAX_PATH+1, new_path);

if (!result)

return FALSE;

if (result > MAX_PATH+1) {

new_path = malloc(result * sizeof(wchar_t));

if (!new_path) {

SetLastError(ERROR_OUTOFMEMORY);

return FALSE;

}

result = GetCurrentDirectoryW(result, new_path);

if (!result) {

free(new_path);

return FALSE;

}

if (wcsncmp(new_path, L"\\\\", 2) == 0 ||

wcsncmp(new_path, L"//", 2) == 0)

/* UNC path, nothing to do. */

return TRUE;

env[1] = new_path[0];

result = SetEnvironmentVariableW(env, new_path);

if (new_path != _new_path)

free(new_path);

return result;

}

#endif

#ifdef MS_WINDOWS

/* The CRT of Windows has a number of flaws wrt. its stat() implementation:

- time stamps are restricted to second resolution

- file modification times suffer from forth-and-back conversions between

UTC and local time

Therefore, we implement our own stat, based on the Win32 API directly.

#define HAVE_STAT_NSEC 1

struct win32_stat{

int st_dev;

__int64 st_ino;

unsigned short st_mode;

int st_nlink;

int st_uid;

int st_gid;

int st_rdev;

__int64 st_size;

int st_atime;

int st_atime_nsec;

int st_mtime;

int st_mtime_nsec;

int st_ctime;

int st_ctime_nsec;

};

static __int64 secs_between_epochs = 11644473600; /* Seconds between 1.1.1601 and 1.1.1970 */

static void

FILE_TIME_to_time_t_nsec(FILETIME *in_ptr, int *time_out, int* nsec_out)

{

/* XXX endianness. Shouldn't matter, as all Windows implementations are little-endian */

/* Cannot simply cast and dereference in_ptr,

since it might not be aligned properly */

__int64 in;

memcpy(&in, in_ptr, sizeof(in));

*nsec_out = (int)(in % 10000000) * 100; /* FILETIME is in units of 100 nsec. */

/* XXX Win32 supports time stamps past 2038; we currently don't */

*time_out = Py_SAFE_DOWNCAST((in / 10000000) - secs_between_epochs, __int64, int);

}

static void

time_t_to_FILE_TIME(int time_in, int nsec_in, FILETIME *out_ptr)

{

/* XXX endianness */

__int64 out;

out = time_in + secs_between_epochs;

out = out * 10000000 + nsec_in / 100;

memcpy(out_ptr, &out, sizeof(out));

}

/* Below, we *know* that ugo+r is 0444 */

#if _S_IREAD != 0400

#error Unsupported C library

#endif

static int

attributes_to_mode(DWORD attr)

{

int m = 0;

if (attr & FILE_ATTRIBUTE_DIRECTORY)

m |= _S_IFDIR | 0111; /* IFEXEC for user,group,other */

else

m |= _S_IFREG;

if (attr & FILE_ATTRIBUTE_READONLY)

m |= 0444;

else

m |= 0666;

return m;

}

static int

attribute_data_to_stat(WIN32_FILE_ATTRIBUTE_DATA *info, struct win32_stat *result)

{

memset(result, 0, sizeof(*result));

result->st_mode = attributes_to_mode(info->dwFileAttributes);

result->st_size = (((__int64)info->nFileSizeHigh)<<32) + info->nFileSizeLow;

FILE_TIME_to_time_t_nsec(&info->ftCreationTime, &result->st_ctime, &result->st_ctime_nsec);

FILE_TIME_to_time_t_nsec(&info->ftLastWriteTime, &result->st_mtime, &result->st_mtime_nsec);

FILE_TIME_to_time_t_nsec(&info->ftLastAccessTime, &result->st_atime, &result->st_atime_nsec);

return 0;

}

/* Emulate GetFileAttributesEx[AW] on Windows 95 */

static int checked = 0;

static BOOL (CALLBACK *gfaxa)(LPCSTR, GET_FILEEX_INFO_LEVELS, LPVOID);

static BOOL (CALLBACK *gfaxw)(LPCWSTR, GET_FILEEX_INFO_LEVELS, LPVOID);

static void

check_gfax()

{

HINSTANCE hKernel32;

if (checked)

return;

checked = 1;

hKernel32 = GetModuleHandle("KERNEL32");

*(FARPROC*)&gfaxa = GetProcAddress(hKernel32, "GetFileAttributesExA");

*(FARPROC*)&gfaxw = GetProcAddress(hKernel32, "GetFileAttributesExW");

}

static BOOL

attributes_from_dir(LPCSTR pszFile, LPWIN32_FILE_ATTRIBUTE_DATA pfad)

{

HANDLE hFindFile;

WIN32_FIND_DATAA FileData;

hFindFile = FindFirstFileA(pszFile, &FileData);

if (hFindFile == INVALID_HANDLE_VALUE)

return FALSE;

FindClose(hFindFile);

pfad->dwFileAttributes = FileData.dwFileAttributes;

pfad->ftCreationTime = FileData.ftCreationTime;

pfad->ftLastAccessTime = FileData.ftLastAccessTime;

pfad->ftLastWriteTime = FileData.ftLastWriteTime;

pfad->nFileSizeHigh = FileData.nFileSizeHigh;

pfad->nFileSizeLow = FileData.nFileSizeLow;

return TRUE;

}

static BOOL

attributes_from_dir_w(LPCWSTR pszFile, LPWIN32_FILE_ATTRIBUTE_DATA pfad)

{

HANDLE hFindFile;

WIN32_FIND_DATAW FileData;

hFindFile = FindFirstFileW(pszFile, &FileData);

if (hFindFile == INVALID_HANDLE_VALUE)

return FALSE;

FindClose(hFindFile);

pfad->dwFileAttributes = FileData.dwFileAttributes;

pfad->ftCreationTime = FileData.ftCreationTime;

pfad->ftLastAccessTime = FileData.ftLastAccessTime;

pfad->ftLastWriteTime = FileData.ftLastWriteTime;

pfad->nFileSizeHigh = FileData.nFileSizeHigh;

pfad->nFileSizeLow = FileData.nFileSizeLow;

return TRUE;

}

static BOOL WINAPI

Py_GetFileAttributesExA(LPCSTR pszFile,

GET_FILEEX_INFO_LEVELS level,

LPVOID pv)

{

BOOL result;

LPWIN32_FILE_ATTRIBUTE_DATA pfad = pv;

/* First try to use the system's implementation, if that is

available and either succeeds to gives an error other than

that it isn't implemented. */

check_gfax();

if (gfaxa) {

result = gfaxa(pszFile, level, pv);

if (result || GetLastError() != ERROR_CALL_NOT_IMPLEMENTED)

return result;

}

/* It's either not present, or not implemented.

Emulate using FindFirstFile. */

if (level != GetFileExInfoStandard) {

SetLastError(ERROR_INVALID_PARAMETER);

return FALSE;

}

/* Use GetFileAttributes to validate that the file name

does not contain wildcards (which FindFirstFile would

accept). */

if (GetFileAttributesA(pszFile) == 0xFFFFFFFF)

return FALSE;

return attributes_from_dir(pszFile, pfad);

}

static BOOL WINAPI

Py_GetFileAttributesExW(LPCWSTR pszFile,

GET_FILEEX_INFO_LEVELS level,

LPVOID pv)

{

BOOL result;

LPWIN32_FILE_ATTRIBUTE_DATA pfad = pv;

/* First try to use the system's implementation, if that is

available and either succeeds to gives an error other than

that it isn't implemented. */

check_gfax();

if (gfaxa) {

result = gfaxw(pszFile, level, pv);

if (result || GetLastError() != ERROR_CALL_NOT_IMPLEMENTED)

return result;

}

/* It's either not present, or not implemented.

Emulate using FindFirstFile. */

if (level != GetFileExInfoStandard) {

SetLastError(ERROR_INVALID_PARAMETER);

return FALSE;

}

/* Use GetFileAttributes to validate that the file name

does not contain wildcards (which FindFirstFile would

accept). */

if (GetFileAttributesW(pszFile) == 0xFFFFFFFF)

return FALSE;

return attributes_from_dir_w(pszFile, pfad);

}

static int

win32_stat(const char* path, struct win32_stat *result)

{

WIN32_FILE_ATTRIBUTE_DATA info;

int code;

char *dot;

/* XXX not supported on Win95 and NT 3.x */

if (!Py_GetFileAttributesExA(path, GetFileExInfoStandard, &info)) {

if (GetLastError() != ERROR_SHARING_VIOLATION) {

/* Protocol violation: we explicitly clear errno, instead of

setting it to a POSIX error. Callers should use GetLastError. */

errno = 0;

return -1;

} else {

/* Could not get attributes on open file. Fall back to

reading the directory. */

if (!attributes_from_dir(path, &info)) {

/* Very strange. This should not fail now */

errno = 0;

return -1;

}

code = attribute_data_to_stat(&info, result);

if (code != 0)

return code;

/* Set S_IFEXEC if it is an .exe, .bat, ... */

dot = strrchr(path, '.');

if (dot) {

if (stricmp(dot, ".bat") == 0 ||

stricmp(dot, ".cmd") == 0 ||

stricmp(dot, ".exe") == 0 ||

stricmp(dot, ".com") == 0)

result->st_mode |= 0111;

}

return code;

}

static int

win32_wstat(const wchar_t* path, struct win32_stat *result)

{

int code;

const wchar_t *dot;

WIN32_FILE_ATTRIBUTE_DATA info;

/* XXX not supported on Win95 and NT 3.x */

if (!Py_GetFileAttributesExW(path, GetFileExInfoStandard, &info)) {

if (GetLastError() != ERROR_SHARING_VIOLATION) {

/* Protocol violation: we explicitly clear errno, instead of

setting it to a POSIX error. Callers should use GetLastError. */

errno = 0;

return -1;

} else {

/* Could not get attributes on open file. Fall back to

reading the directory. */

if (!attributes_from_dir_w(path, &info)) {

/* Very strange. This should not fail now */

errno = 0;

return -1;

View remainder of file in raw view

python/Modules/posixmodule.c at master · pylee/python · GitHub

Navigation Menu

Expand file tree

Breadcrumbs

posixmodule.c

Latest commit

History

Breadcrumbs

posixmodule.c

File metadata and controls

Footer

Footer navigation