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cpython/Modules/_stat.c
Minmin Gong 711f9e180a
bpo-40677: Define IO_REPARSE_TAG_APPEXECLINK explicitly (GH-20206) 
This allows building with older versions of the Windows SDK where the value is not defined.
2020-05-19 13:22:16 +01:00

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/* stat.h interface
*
* The module defines all S_IF*, S_I*, UF_*, SF_* and ST_* constants to
* sensible default values as well as defines S_IS*() macros in order to keep
* backward compatibility with the old stat.py module.
*
* New constants and macros such as S_IFDOOR / S_ISDOOR() are always defined
* as int 0.
*
* NOTE: POSIX only defines the values of the S_I* permission bits.
*
*/
#define PY_SSIZE_T_CLEAN
#include "Python.h"
#ifdef __cplusplus
extern "C" {
#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 MS_WINDOWS
#include <windows.h>
typedef unsigned short mode_t;
/* FILE_ATTRIBUTE_INTEGRITY_STREAM and FILE_ATTRIBUTE_NO_SCRUB_DATA
are not present in VC2010, so define them manually */
#ifndef FILE_ATTRIBUTE_INTEGRITY_STREAM
# define FILE_ATTRIBUTE_INTEGRITY_STREAM 0x8000
#endif
#ifndef FILE_ATTRIBUTE_NO_SCRUB_DATA
# define FILE_ATTRIBUTE_NO_SCRUB_DATA 0x20000
#endif
#ifndef IO_REPARSE_TAG_APPEXECLINK
# define IO_REPARSE_TAG_APPEXECLINK 0x8000001BL
#endif
#endif /* MS_WINDOWS */
/* From Python's stat.py */
#ifndef S_IMODE
# define S_IMODE 07777
#endif
/* S_IFXXX constants (file types)
*
* Only the names are defined by POSIX but not their value. All common file
* types seems to have the same numeric value on all platforms, though.
*
* pyport.h guarantees S_IFMT, S_IFDIR, S_IFCHR, S_IFREG and S_IFLNK
*/
#ifndef S_IFBLK
# define S_IFBLK 0060000
#endif
#ifndef S_IFIFO
# define S_IFIFO 0010000
#endif
#ifndef S_IFSOCK
# define S_IFSOCK 0140000
#endif
#ifndef S_IFDOOR
# define S_IFDOOR 0
#endif
#ifndef S_IFPORT
# define S_IFPORT 0
#endif
#ifndef S_IFWHT
# define S_IFWHT 0
#endif
/* S_ISXXX()
* pyport.h defines S_ISDIR(), S_ISREG() and S_ISCHR()
*/
#ifndef S_ISBLK
# define S_ISBLK(mode) (((mode) & S_IFMT) == S_IFBLK)
#endif
#ifndef S_ISFIFO
# define S_ISFIFO(mode) (((mode) & S_IFMT) == S_IFIFO)
#endif
#ifndef S_ISLNK
# define S_ISLNK(mode) (((mode) & S_IFMT) == S_IFLNK)
#endif
#ifndef S_ISSOCK
# define S_ISSOCK(mode) (((mode) & S_IFMT) == S_IFSOCK)
#endif
#ifndef S_ISDOOR
# define S_ISDOOR(mode) 0
#endif
#ifndef S_ISPORT
# define S_ISPORT(mode) 0
#endif
#ifndef S_ISWHT
# define S_ISWHT(mode) 0
#endif
/* S_I* file permission
*
* The permission bit value are defined by POSIX standards.
*/
#ifndef S_ISUID
# define S_ISUID 04000
#endif
#ifndef S_ISGID
# define S_ISGID 02000
#endif
/* what is S_ENFMT? */
#ifndef S_ENFMT
# define S_ENFMT S_ISGID
#endif
#ifndef S_ISVTX
# define S_ISVTX 01000
#endif
#ifndef S_IREAD
# define S_IREAD 00400
#endif
#ifndef S_IWRITE
# define S_IWRITE 00200
#endif
#ifndef S_IEXEC
# define S_IEXEC 00100
#endif
#ifndef S_IRWXU
# define S_IRWXU 00700
#endif
#ifndef S_IRUSR
# define S_IRUSR 00400
#endif
#ifndef S_IWUSR
# define S_IWUSR 00200
#endif
#ifndef S_IXUSR
# define S_IXUSR 00100
#endif
#ifndef S_IRWXG
# define S_IRWXG 00070
#endif
#ifndef S_IRGRP
# define S_IRGRP 00040
#endif
#ifndef S_IWGRP
# define S_IWGRP 00020
#endif
#ifndef S_IXGRP
# define S_IXGRP 00010
#endif
#ifndef S_IRWXO
# define S_IRWXO 00007
#endif
#ifndef S_IROTH
# define S_IROTH 00004
#endif
#ifndef S_IWOTH
# define S_IWOTH 00002
#endif
#ifndef S_IXOTH
# define S_IXOTH 00001
#endif
/* Names for file flags */
#ifndef UF_NODUMP
# define UF_NODUMP 0x00000001
#endif
#ifndef UF_IMMUTABLE
# define UF_IMMUTABLE 0x00000002
#endif
#ifndef UF_APPEND
# define UF_APPEND 0x00000004
#endif
#ifndef UF_OPAQUE
# define UF_OPAQUE 0x00000008
#endif
#ifndef UF_NOUNLINK
# define UF_NOUNLINK 0x00000010
#endif
#ifndef UF_COMPRESSED
# define UF_COMPRESSED 0x00000020
#endif
#ifndef UF_HIDDEN
# define UF_HIDDEN 0x00008000
#endif
#ifndef SF_ARCHIVED
# define SF_ARCHIVED 0x00010000
#endif
#ifndef SF_IMMUTABLE
# define SF_IMMUTABLE 0x00020000
#endif
#ifndef SF_APPEND
# define SF_APPEND 0x00040000
#endif
#ifndef SF_NOUNLINK
# define SF_NOUNLINK 0x00100000
#endif
#ifndef SF_SNAPSHOT
# define SF_SNAPSHOT 0x00200000
#endif
static mode_t
_PyLong_AsMode_t(PyObject *op)
{
unsigned long value;
mode_t mode;
value = PyLong_AsUnsignedLong(op);
if ((value == (unsigned long)-1) && PyErr_Occurred())
return (mode_t)-1;
mode = (mode_t)value;
if ((unsigned long)mode != value) {
PyErr_SetString(PyExc_OverflowError, "mode out of range");
return (mode_t)-1;
}
return mode;
}
#define stat_S_ISFUNC(isfunc, doc) \
static PyObject * \
stat_ ##isfunc (PyObject *self, PyObject *omode) \
{ \
mode_t mode = _PyLong_AsMode_t(omode); \
if ((mode == (mode_t)-1) && PyErr_Occurred()) \
return NULL; \
return PyBool_FromLong(isfunc(mode)); \
} \
PyDoc_STRVAR(stat_ ## isfunc ## _doc, doc)
stat_S_ISFUNC(S_ISDIR,
"S_ISDIR(mode) -> bool\n\n"
"Return True if mode is from a directory.");
stat_S_ISFUNC(S_ISCHR,
"S_ISCHR(mode) -> bool\n\n"
"Return True if mode is from a character special device file.");
stat_S_ISFUNC(S_ISBLK,
"S_ISBLK(mode) -> bool\n\n"
"Return True if mode is from a block special device file.");
stat_S_ISFUNC(S_ISREG,
"S_ISREG(mode) -> bool\n\n"
"Return True if mode is from a regular file.");
stat_S_ISFUNC(S_ISFIFO,
"S_ISFIFO(mode) -> bool\n\n"
"Return True if mode is from a FIFO (named pipe).");
stat_S_ISFUNC(S_ISLNK,
"S_ISLNK(mode) -> bool\n\n"
"Return True if mode is from a symbolic link.");
stat_S_ISFUNC(S_ISSOCK,
"S_ISSOCK(mode) -> bool\n\n"
"Return True if mode is from a socket.");
stat_S_ISFUNC(S_ISDOOR,
"S_ISDOOR(mode) -> bool\n\n"
"Return True if mode is from a door.");
stat_S_ISFUNC(S_ISPORT,
"S_ISPORT(mode) -> bool\n\n"
"Return True if mode is from an event port.");
stat_S_ISFUNC(S_ISWHT,
"S_ISWHT(mode) -> bool\n\n"
"Return True if mode is from a whiteout.");
PyDoc_STRVAR(stat_S_IMODE_doc,
"Return the portion of the file's mode that can be set by os.chmod().");
static PyObject *
stat_S_IMODE(PyObject *self, PyObject *omode)
{
mode_t mode = _PyLong_AsMode_t(omode);
if ((mode == (mode_t)-1) && PyErr_Occurred())
return NULL;
return PyLong_FromUnsignedLong(mode & S_IMODE);
}
PyDoc_STRVAR(stat_S_IFMT_doc,
"Return the portion of the file's mode that describes the file type.");
static PyObject *
stat_S_IFMT(PyObject *self, PyObject *omode)
{
mode_t mode = _PyLong_AsMode_t(omode);
if ((mode == (mode_t)-1) && PyErr_Occurred())
return NULL;
return PyLong_FromUnsignedLong(mode & S_IFMT);
}
/* file type chars according to
http://en.wikibooks.org/wiki/C_Programming/POSIX_Reference/sys/stat.h */
static char
filetype(mode_t mode)
{
/* common cases first */
if (S_ISREG(mode)) return '-';
if (S_ISDIR(mode)) return 'd';
if (S_ISLNK(mode)) return 'l';
/* special files */
if (S_ISBLK(mode)) return 'b';
if (S_ISCHR(mode)) return 'c';
if (S_ISFIFO(mode)) return 'p';
if (S_ISSOCK(mode)) return 's';
/* non-standard types */
if (S_ISDOOR(mode)) return 'D';
if (S_ISPORT(mode)) return 'P';
if (S_ISWHT(mode)) return 'w';
/* unknown */
return '?';
}
static void
fileperm(mode_t mode, char *buf)
{
buf[0] = mode & S_IRUSR ? 'r' : '-';
buf[1] = mode & S_IWUSR ? 'w' : '-';
if (mode & S_ISUID) {
buf[2] = mode & S_IXUSR ? 's' : 'S';
} else {
buf[2] = mode & S_IXUSR ? 'x' : '-';
}
buf[3] = mode & S_IRGRP ? 'r' : '-';
buf[4] = mode & S_IWGRP ? 'w' : '-';
if (mode & S_ISGID) {
buf[5] = mode & S_IXGRP ? 's' : 'S';
} else {
buf[5] = mode & S_IXGRP ? 'x' : '-';
}
buf[6] = mode & S_IROTH ? 'r' : '-';
buf[7] = mode & S_IWOTH ? 'w' : '-';
if (mode & S_ISVTX) {
buf[8] = mode & S_IXOTH ? 't' : 'T';
} else {
buf[8] = mode & S_IXOTH ? 'x' : '-';
}
}
PyDoc_STRVAR(stat_filemode_doc,
"Convert a file's mode to a string of the form '-rwxrwxrwx'");
static PyObject *
stat_filemode(PyObject *self, PyObject *omode)
{
char buf[10];
mode_t mode;
mode = _PyLong_AsMode_t(omode);
if ((mode == (mode_t)-1) && PyErr_Occurred())
return NULL;
buf[0] = filetype(mode);
fileperm(mode, &buf[1]);
return PyUnicode_FromStringAndSize(buf, 10);
}
static PyMethodDef stat_methods[] = {
{"S_ISDIR", stat_S_ISDIR, METH_O, stat_S_ISDIR_doc},
{"S_ISCHR", stat_S_ISCHR, METH_O, stat_S_ISCHR_doc},
{"S_ISBLK", stat_S_ISBLK, METH_O, stat_S_ISBLK_doc},
{"S_ISREG", stat_S_ISREG, METH_O, stat_S_ISREG_doc},
{"S_ISFIFO", stat_S_ISFIFO, METH_O, stat_S_ISFIFO_doc},
{"S_ISLNK", stat_S_ISLNK, METH_O, stat_S_ISLNK_doc},
{"S_ISSOCK", stat_S_ISSOCK, METH_O, stat_S_ISSOCK_doc},
{"S_ISDOOR", stat_S_ISDOOR, METH_O, stat_S_ISDOOR_doc},
{"S_ISPORT", stat_S_ISPORT, METH_O, stat_S_ISPORT_doc},
{"S_ISWHT", stat_S_ISWHT, METH_O, stat_S_ISWHT_doc},
{"S_IMODE", stat_S_IMODE, METH_O, stat_S_IMODE_doc},
{"S_IFMT", stat_S_IFMT, METH_O, stat_S_IFMT_doc},
{"filemode", stat_filemode, METH_O, stat_filemode_doc},
{NULL, NULL} /* sentinel */
};
PyDoc_STRVAR(module_doc,
"S_IFMT_: file type bits\n\
S_IFDIR: directory\n\
S_IFCHR: character device\n\
S_IFBLK: block device\n\
S_IFREG: regular file\n\
S_IFIFO: fifo (named pipe)\n\
S_IFLNK: symbolic link\n\
S_IFSOCK: socket file\n\
S_IFDOOR: door\n\
S_IFPORT: event port\n\
S_IFWHT: whiteout\n\
\n"
"S_ISUID: set UID bit\n\
S_ISGID: set GID bit\n\
S_ENFMT: file locking enforcement\n\
S_ISVTX: sticky bit\n\
S_IREAD: Unix V7 synonym for S_IRUSR\n\
S_IWRITE: Unix V7 synonym for S_IWUSR\n\
S_IEXEC: Unix V7 synonym for S_IXUSR\n\
S_IRWXU: mask for owner permissions\n\
S_IRUSR: read by owner\n\
S_IWUSR: write by owner\n\
S_IXUSR: execute by owner\n\
S_IRWXG: mask for group permissions\n\
S_IRGRP: read by group\n\
S_IWGRP: write by group\n\
S_IXGRP: execute by group\n\
S_IRWXO: mask for others (not in group) permissions\n\
S_IROTH: read by others\n\
S_IWOTH: write by others\n\
S_IXOTH: execute by others\n\
\n"
"UF_NODUMP: do not dump file\n\
UF_IMMUTABLE: file may not be changed\n\
UF_APPEND: file may only be appended to\n\
UF_OPAQUE: directory is opaque when viewed through a union stack\n\
UF_NOUNLINK: file may not be renamed or deleted\n\
UF_COMPRESSED: OS X: file is hfs-compressed\n\
UF_HIDDEN: OS X: file should not be displayed\n\
SF_ARCHIVED: file may be archived\n\
SF_IMMUTABLE: file may not be changed\n\
SF_APPEND: file may only be appended to\n\
SF_NOUNLINK: file may not be renamed or deleted\n\
SF_SNAPSHOT: file is a snapshot file\n\
\n"
"ST_MODE\n\
ST_INO\n\
ST_DEV\n\
ST_NLINK\n\
ST_UID\n\
ST_GID\n\
ST_SIZE\n\
ST_ATIME\n\
ST_MTIME\n\
ST_CTIME\n\
\n"
"FILE_ATTRIBUTE_*: Windows file attribute constants\n\
(only present on Windows)\n\
");
static int
stat_exec(PyObject *module)
{
#define ADD_INT_MACRO(module, macro) \
do { \
if (PyModule_AddIntConstant(module, #macro, macro) < 0) { \
return -1; \
} \
} while (0)
ADD_INT_MACRO(module, S_IFDIR);
ADD_INT_MACRO(module, S_IFCHR);
ADD_INT_MACRO(module, S_IFBLK);
ADD_INT_MACRO(module, S_IFREG);
ADD_INT_MACRO(module, S_IFIFO);
ADD_INT_MACRO(module, S_IFLNK);
ADD_INT_MACRO(module, S_IFSOCK);
ADD_INT_MACRO(module, S_IFDOOR);
ADD_INT_MACRO(module, S_IFPORT);
ADD_INT_MACRO(module, S_IFWHT);
ADD_INT_MACRO(module, S_ISUID);
ADD_INT_MACRO(module, S_ISGID);
ADD_INT_MACRO(module, S_ISVTX);
ADD_INT_MACRO(module, S_ENFMT);
ADD_INT_MACRO(module, S_IREAD);
ADD_INT_MACRO(module, S_IWRITE);
ADD_INT_MACRO(module, S_IEXEC);
ADD_INT_MACRO(module, S_IRWXU);
ADD_INT_MACRO(module, S_IRUSR);
ADD_INT_MACRO(module, S_IWUSR);
ADD_INT_MACRO(module, S_IXUSR);
ADD_INT_MACRO(module, S_IRWXG);
ADD_INT_MACRO(module, S_IRGRP);
ADD_INT_MACRO(module, S_IWGRP);
ADD_INT_MACRO(module, S_IXGRP);
ADD_INT_MACRO(module, S_IRWXO);
ADD_INT_MACRO(module, S_IROTH);
ADD_INT_MACRO(module, S_IWOTH);
ADD_INT_MACRO(module, S_IXOTH);
ADD_INT_MACRO(module, UF_NODUMP);
ADD_INT_MACRO(module, UF_IMMUTABLE);
ADD_INT_MACRO(module, UF_APPEND);
ADD_INT_MACRO(module, UF_OPAQUE);
ADD_INT_MACRO(module, UF_NOUNLINK);
ADD_INT_MACRO(module, UF_COMPRESSED);
ADD_INT_MACRO(module, UF_HIDDEN);
ADD_INT_MACRO(module, SF_ARCHIVED);
ADD_INT_MACRO(module, SF_IMMUTABLE);
ADD_INT_MACRO(module, SF_APPEND);
ADD_INT_MACRO(module, SF_NOUNLINK);
ADD_INT_MACRO(module, SF_SNAPSHOT);
const char* st_constants[] = {
"ST_MODE",
"ST_INO",
"ST_DEV",
"ST_NLINK",
"ST_UID",
"ST_GID",
"ST_SIZE",
"ST_ATIME",
"ST_MTIME",
"ST_CTIME"
};
for (int i = 0; i < (int)Py_ARRAY_LENGTH(st_constants); i++) {
if (PyModule_AddIntConstant(module, st_constants[i], i) < 0) {
return -1;
}
}
#ifdef MS_WINDOWS
ADD_INT_MACRO(module, FILE_ATTRIBUTE_ARCHIVE);
ADD_INT_MACRO(module, FILE_ATTRIBUTE_COMPRESSED);
ADD_INT_MACRO(module, FILE_ATTRIBUTE_DEVICE);
ADD_INT_MACRO(module, FILE_ATTRIBUTE_DIRECTORY);
ADD_INT_MACRO(module, FILE_ATTRIBUTE_ENCRYPTED);
ADD_INT_MACRO(module, FILE_ATTRIBUTE_HIDDEN);
ADD_INT_MACRO(module, FILE_ATTRIBUTE_INTEGRITY_STREAM);
ADD_INT_MACRO(module, FILE_ATTRIBUTE_NORMAL);
ADD_INT_MACRO(module, FILE_ATTRIBUTE_NOT_CONTENT_INDEXED);
ADD_INT_MACRO(module, FILE_ATTRIBUTE_NO_SCRUB_DATA);
ADD_INT_MACRO(module, FILE_ATTRIBUTE_OFFLINE);
ADD_INT_MACRO(module, FILE_ATTRIBUTE_READONLY);
ADD_INT_MACRO(module, FILE_ATTRIBUTE_REPARSE_POINT);
ADD_INT_MACRO(module, FILE_ATTRIBUTE_SPARSE_FILE);
ADD_INT_MACRO(module, FILE_ATTRIBUTE_SYSTEM);
ADD_INT_MACRO(module, FILE_ATTRIBUTE_TEMPORARY);
ADD_INT_MACRO(module, FILE_ATTRIBUTE_VIRTUAL);
if (PyModule_AddObject(module, "IO_REPARSE_TAG_SYMLINK",
PyLong_FromUnsignedLong(IO_REPARSE_TAG_SYMLINK)) < 0) {
return -1;
}
if (PyModule_AddObject(module, "IO_REPARSE_TAG_MOUNT_POINT",
PyLong_FromUnsignedLong(IO_REPARSE_TAG_MOUNT_POINT)) < 0) {
return -1;
}
if (PyModule_AddObject(module, "IO_REPARSE_TAG_APPEXECLINK",
PyLong_FromUnsignedLong(IO_REPARSE_TAG_APPEXECLINK)) < 0) {
return -1;
}
#endif
return 0;
}
static PyModuleDef_Slot stat_slots[] = {
{Py_mod_exec, stat_exec},
{0, NULL}
};
static struct PyModuleDef statmodule = {
PyModuleDef_HEAD_INIT,
.m_name = "_stat",
.m_doc = module_doc,
.m_size = 0,
.m_methods = stat_methods,
.m_slots = stat_slots,
};
PyMODINIT_FUNC
PyInit__stat(void)
{
return PyModuleDef_Init(&statmodule);
}
#ifdef __cplusplus
}
#endif
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