/
posixmodule.c
13937 lines (11868 loc) · 358 KB
/
posixmodule.c
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/* POSIX module implementation */
/* This file is also used for Windows NT/MS-Win. In that case the
module actually calls itself 'nt', 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. '_MSC_VER'. */
#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 "pythread.h"
#include "structmember.h"
#ifndef MS_WINDOWS
#include "posixmodule.h"
#else
#include "winreparse.h"
#endif
/* On android API level 21, 'AT_EACCESS' is not declared although
* HAVE_FACCESSAT is defined. */
#ifdef __ANDROID__
#undef HAVE_FACCESSAT
#endif
#include <stdio.h> /* needed for ctermid() */
#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.");
#ifdef HAVE_SYS_UIO_H
#include <sys/uio.h>
#endif
#ifdef HAVE_SYS_SYSMACROS_H
/* GNU C Library: major(), minor(), makedev() */
#include <sys/sysmacros.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
#ifdef HAVE_SYS_SENDFILE_H
#include <sys/sendfile.h>
#endif
#if defined(__APPLE__)
#include <copyfile.h>
#endif
#ifdef HAVE_SCHED_H
#include <sched.h>
#endif
#if !defined(CPU_ALLOC) && defined(HAVE_SCHED_SETAFFINITY)
#undef HAVE_SCHED_SETAFFINITY
#endif
#if defined(HAVE_SYS_XATTR_H) && defined(__GLIBC__) && !defined(__FreeBSD_kernel__) && !defined(__GNU__)
#define USE_XATTRS
#endif
#ifdef USE_XATTRS
#include <sys/xattr.h>
#endif
#if defined(__FreeBSD__) || defined(__DragonFly__) || defined(__APPLE__)
#ifdef HAVE_SYS_SOCKET_H
#include <sys/socket.h>
#endif
#endif
#ifdef HAVE_DLFCN_H
#include <dlfcn.h>
#endif
#ifdef __hpux
#include <sys/mpctl.h>
#endif
#if defined(__DragonFly__) || \
defined(__OpenBSD__) || \
defined(__FreeBSD__) || \
defined(__NetBSD__) || \
defined(__APPLE__)
#include <sys/sysctl.h>
#endif
#ifdef HAVE_LINUX_RANDOM_H
# include <linux/random.h>
#endif
#ifdef HAVE_GETRANDOM_SYSCALL
# include <sys/syscall.h>
#endif
#if defined(MS_WINDOWS)
# define TERMSIZE_USE_CONIO
#elif defined(HAVE_SYS_IOCTL_H)
# include <sys/ioctl.h>
# if defined(HAVE_TERMIOS_H)
# include <termios.h>
# endif
# if defined(TIOCGWINSZ)
# define TERMSIZE_USE_IOCTL
# endif
#endif /* MS_WINDOWS */
/* Various compilers have only certain posix functions */
/* XXX Gosh I wish these were all moved into pyconfig.h */
#if defined(__WATCOMC__) && !defined(__QNX__) /* Watcom compiler */
#define HAVE_OPENDIR 1
#define HAVE_SYSTEM 1
#include <process.h>
#else
#ifdef _MSC_VER /* Microsoft compiler */
#define HAVE_GETPPID 1
#define HAVE_GETLOGIN 1
#define HAVE_SPAWNV 1
#define HAVE_EXECV 1
#define HAVE_WSPAWNV 1
#define HAVE_WEXECV 1
#define HAVE_PIPE 1
#define HAVE_SYSTEM 1
#define HAVE_CWAIT 1
#define HAVE_FSYNC 1
#define fsync _commit
#else
/* 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_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
#define HAVE_SYSTEM 1
#define HAVE_WAIT 1
#define HAVE_TTYNAME 1
#endif /* _MSC_VER */
#endif /* ! __WATCOMC__ || __QNX__ */
/*[clinic input]
# one of the few times we lie about this name!
module os
[clinic start generated code]*/
/*[clinic end generated code: output=da39a3ee5e6b4b0d input=94a0f0f978acae17]*/
#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(__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
extern int chmod(const char *, mode_t);
/*#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 *);
#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_POSIX_SPAWN
#include <spawn.h>
#endif
#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
#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
#ifndef IO_REPARSE_TAG_SYMLINK
#define IO_REPARSE_TAG_SYMLINK (0xA000000CL)
#endif
#ifndef IO_REPARSE_TAG_MOUNT_POINT
#define IO_REPARSE_TAG_MOUNT_POINT (0xA0000003L)
#endif
#include "osdefs.h"
#include <malloc.h>
#include <windows.h>
#include <shellapi.h> /* for ShellExecute() */
#include <lmcons.h> /* for UNLEN */
#ifdef SE_CREATE_SYMBOLIC_LINK_NAME /* Available starting with Vista */
#define HAVE_SYMLINK
static int win32_can_symlink = 0;
#endif
#endif /* _MSC_VER */
#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)
#define USE_CTERMID_R
#endif
/* choose the appropriate stat and fstat functions and return structs */
#undef STAT
#undef FSTAT
#undef STRUCT_STAT
#ifdef MS_WINDOWS
# define STAT win32_stat
# define LSTAT win32_lstat
# define FSTAT _Py_fstat_noraise
# define STRUCT_STAT struct _Py_stat_struct
#else
# define STAT stat
# define LSTAT lstat
# 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
#endif
#ifdef MS_WINDOWS
#define INITFUNC PyInit_nt
#define MODNAME "nt"
#else
#define INITFUNC PyInit_posix
#define MODNAME "posix"
#endif
#if defined(__sun)
/* Something to implement in autoconf, not present in autoconf 2.69 */
#define HAVE_STRUCT_STAT_ST_FSTYPE 1
#endif
#ifdef HAVE_FORK
static void
run_at_forkers(PyObject *lst, int reverse)
{
Py_ssize_t i;
PyObject *cpy;
if (lst != NULL) {
assert(PyList_CheckExact(lst));
/* Use a list copy in case register_at_fork() is called from
* one of the callbacks.
*/
cpy = PyList_GetSlice(lst, 0, PyList_GET_SIZE(lst));
if (cpy == NULL)
PyErr_WriteUnraisable(lst);
else {
if (reverse)
PyList_Reverse(cpy);
for (i = 0; i < PyList_GET_SIZE(cpy); i++) {
PyObject *func, *res;
func = PyList_GET_ITEM(cpy, i);
res = PyObject_CallObject(func, NULL);
if (res == NULL)
PyErr_WriteUnraisable(func);
else
Py_DECREF(res);
}
Py_DECREF(cpy);
}
}
}
void
PyOS_BeforeFork(void)
{
run_at_forkers(_PyInterpreterState_Get()->before_forkers, 1);
_PyImport_AcquireLock();
}
void
PyOS_AfterFork_Parent(void)
{
if (_PyImport_ReleaseLock() <= 0)
Py_FatalError("failed releasing import lock after fork");
run_at_forkers(_PyInterpreterState_Get()->after_forkers_parent, 0);
}
void
PyOS_AfterFork_Child(void)
{
_PyGILState_Reinit();
PyEval_ReInitThreads();
_PyImport_ReInitLock();
_PySignal_AfterFork();
run_at_forkers(_PyInterpreterState_Get()->after_forkers_child, 0);
}
static int
register_at_forker(PyObject **lst, PyObject *func)
{
if (func == NULL) /* nothing to register? do nothing. */
return 0;
if (*lst == NULL) {
*lst = PyList_New(0);
if (*lst == NULL)
return -1;
}
return PyList_Append(*lst, func);
}
#endif
/* Legacy wrapper */
void
PyOS_AfterFork(void)
{
#ifdef HAVE_FORK
PyOS_AfterFork_Child();
#endif
}
#ifdef MS_WINDOWS
/* defined in fileutils.c */
PyAPI_FUNC(void) _Py_time_t_to_FILE_TIME(time_t, int, FILETIME *);
PyAPI_FUNC(void) _Py_attribute_data_to_stat(BY_HANDLE_FILE_INFORMATION *,
ULONG, struct _Py_stat_struct *);
#endif
#ifdef MS_WINDOWS
static int
win32_warn_bytes_api()
{
return PyErr_WarnEx(PyExc_DeprecationWarning,
"The Windows bytes API has been deprecated, "
"use Unicode filenames instead",
1);
}
#endif
#ifndef MS_WINDOWS
PyObject *
_PyLong_FromUid(uid_t uid)
{
if (uid == (uid_t)-1)
return PyLong_FromLong(-1);
return PyLong_FromUnsignedLong(uid);
}
PyObject *
_PyLong_FromGid(gid_t gid)
{
if (gid == (gid_t)-1)
return PyLong_FromLong(-1);
return PyLong_FromUnsignedLong(gid);
}
int
_Py_Uid_Converter(PyObject *obj, void *p)
{
uid_t uid;
PyObject *index;
int overflow;
long result;
unsigned long uresult;
index = PyNumber_Index(obj);
if (index == NULL) {
PyErr_Format(PyExc_TypeError,
"uid should be integer, not %.200s",
Py_TYPE(obj)->tp_name);
return 0;
}
/*
* Handling uid_t is complicated for two reasons:
* * Although uid_t is (always?) unsigned, it still
* accepts -1.
* * We don't know its size in advance--it may be
* bigger than an int, or it may be smaller than
* a long.
*
* So a bit of defensive programming is in order.
* Start with interpreting the value passed
* in as a signed long and see if it works.
*/
result = PyLong_AsLongAndOverflow(index, &overflow);
if (!overflow) {
uid = (uid_t)result;
if (result == -1) {
if (PyErr_Occurred())
goto fail;
/* It's a legitimate -1, we're done. */
goto success;
}
/* Any other negative number is disallowed. */
if (result < 0)
goto underflow;
/* Ensure the value wasn't truncated. */
if (sizeof(uid_t) < sizeof(long) &&
(long)uid != result)
goto underflow;
goto success;
}
if (overflow < 0)
goto underflow;
/*
* Okay, the value overflowed a signed long. If it
* fits in an *unsigned* long, it may still be okay,
* as uid_t may be unsigned long on this platform.
*/
uresult = PyLong_AsUnsignedLong(index);
if (PyErr_Occurred()) {
if (PyErr_ExceptionMatches(PyExc_OverflowError))
goto overflow;
goto fail;
}
uid = (uid_t)uresult;
/*
* If uid == (uid_t)-1, the user actually passed in ULONG_MAX,
* but this value would get interpreted as (uid_t)-1 by chown
* and its siblings. That's not what the user meant! So we
* throw an overflow exception instead. (We already
* handled a real -1 with PyLong_AsLongAndOverflow() above.)
*/
if (uid == (uid_t)-1)
goto overflow;
/* Ensure the value wasn't truncated. */
if (sizeof(uid_t) < sizeof(long) &&
(unsigned long)uid != uresult)
goto overflow;
/* fallthrough */
success:
Py_DECREF(index);
*(uid_t *)p = uid;
return 1;
underflow:
PyErr_SetString(PyExc_OverflowError,
"uid is less than minimum");
goto fail;
overflow:
PyErr_SetString(PyExc_OverflowError,
"uid is greater than maximum");
/* fallthrough */
fail:
Py_DECREF(index);
return 0;
}
int
_Py_Gid_Converter(PyObject *obj, void *p)
{
gid_t gid;
PyObject *index;
int overflow;
long result;
unsigned long uresult;
index = PyNumber_Index(obj);
if (index == NULL) {
PyErr_Format(PyExc_TypeError,
"gid should be integer, not %.200s",
Py_TYPE(obj)->tp_name);
return 0;
}
/*
* Handling gid_t is complicated for two reasons:
* * Although gid_t is (always?) unsigned, it still
* accepts -1.
* * We don't know its size in advance--it may be
* bigger than an int, or it may be smaller than
* a long.
*
* So a bit of defensive programming is in order.
* Start with interpreting the value passed
* in as a signed long and see if it works.
*/
result = PyLong_AsLongAndOverflow(index, &overflow);
if (!overflow) {
gid = (gid_t)result;
if (result == -1) {
if (PyErr_Occurred())
goto fail;
/* It's a legitimate -1, we're done. */
goto success;
}
/* Any other negative number is disallowed. */
if (result < 0) {
goto underflow;
}
/* Ensure the value wasn't truncated. */
if (sizeof(gid_t) < sizeof(long) &&
(long)gid != result)
goto underflow;
goto success;
}
if (overflow < 0)
goto underflow;
/*
* Okay, the value overflowed a signed long. If it
* fits in an *unsigned* long, it may still be okay,
* as gid_t may be unsigned long on this platform.
*/
uresult = PyLong_AsUnsignedLong(index);
if (PyErr_Occurred()) {
if (PyErr_ExceptionMatches(PyExc_OverflowError))
goto overflow;
goto fail;
}
gid = (gid_t)uresult;
/*
* If gid == (gid_t)-1, the user actually passed in ULONG_MAX,
* but this value would get interpreted as (gid_t)-1 by chown
* and its siblings. That's not what the user meant! So we
* throw an overflow exception instead. (We already
* handled a real -1 with PyLong_AsLongAndOverflow() above.)
*/
if (gid == (gid_t)-1)
goto overflow;
/* Ensure the value wasn't truncated. */
if (sizeof(gid_t) < sizeof(long) &&
(unsigned long)gid != uresult)
goto overflow;
/* fallthrough */
success:
Py_DECREF(index);
*(gid_t *)p = gid;
return 1;
underflow:
PyErr_SetString(PyExc_OverflowError,
"gid is less than minimum");
goto fail;
overflow:
PyErr_SetString(PyExc_OverflowError,
"gid is greater than maximum");
/* fallthrough */
fail:
Py_DECREF(index);
return 0;
}
#endif /* MS_WINDOWS */
#define _PyLong_FromDev PyLong_FromLongLong
#if defined(HAVE_MKNOD) && defined(HAVE_MAKEDEV)
static int
_Py_Dev_Converter(PyObject *obj, void *p)
{
*((dev_t *)p) = PyLong_AsUnsignedLongLong(obj);
if (PyErr_Occurred())
return 0;
return 1;
}
#endif /* HAVE_MKNOD && HAVE_MAKEDEV */
#ifdef AT_FDCWD
/*
* Why the (int) cast? Solaris 10 defines AT_FDCWD as 0xffd19553 (-3041965);
* without the int cast, the value gets interpreted as uint (4291925331),
* which doesn't play nicely with all the initializer lines in this file that
* look like this:
* int dir_fd = DEFAULT_DIR_FD;
*/
#define DEFAULT_DIR_FD (int)AT_FDCWD
#else
#define DEFAULT_DIR_FD (-100)
#endif
static int
_fd_converter(PyObject *o, int *p)
{
int overflow;
long long_value;
PyObject *index = PyNumber_Index(o);
if (index == NULL) {
return 0;
}
assert(PyLong_Check(index));
long_value = PyLong_AsLongAndOverflow(index, &overflow);
Py_DECREF(index);
assert(!PyErr_Occurred());
if (overflow > 0 || long_value > INT_MAX) {
PyErr_SetString(PyExc_OverflowError,
"fd is greater than maximum");
return 0;
}
if (overflow < 0 || long_value < INT_MIN) {
PyErr_SetString(PyExc_OverflowError,
"fd is less than minimum");
return 0;
}
*p = (int)long_value;
return 1;
}
static int
dir_fd_converter(PyObject *o, void *p)
{
if (o == Py_None) {
*(int *)p = DEFAULT_DIR_FD;
return 1;
}
else if (PyIndex_Check(o)) {
return _fd_converter(o, (int *)p);
}
else {
PyErr_Format(PyExc_TypeError,
"argument should be integer or None, not %.200s",
Py_TYPE(o)->tp_name);
return 0;
}
}
/*
* A PyArg_ParseTuple "converter" function
* that handles filesystem paths in the manner
* preferred by the os module.
*
* path_converter accepts (Unicode) strings and their
* subclasses, and bytes and their subclasses. What
* it does with the argument depends on the platform:
*
* * On Windows, if we get a (Unicode) string we
* extract the wchar_t * and return it; if we get
* bytes we decode to wchar_t * and return that.
*
* * On all other platforms, strings are encoded
* to bytes using PyUnicode_FSConverter, then we
* extract the char * from the bytes object and
* return that.
*
* path_converter also optionally accepts signed
* integers (representing open file descriptors) instead
* of path strings.
*
* Input fields:
* path.nullable
* If nonzero, the path is permitted to be None.
* path.allow_fd
* If nonzero, the path is permitted to be a file handle
* (a signed int) instead of a string.
* path.function_name
* If non-NULL, path_converter will use that as the name
* of the function in error messages.
* (If path.function_name is NULL it omits the function name.)
* path.argument_name
* If non-NULL, path_converter will use that as the name
* of the parameter in error messages.
* (If path.argument_name is NULL it uses "path".)
*
* Output fields:
* path.wide
* Points to the path if it was expressed as Unicode
* and was not encoded. (Only used on Windows.)
* path.narrow
* Points to the path if it was expressed as bytes,
* or it was Unicode and was encoded to bytes. (On Windows,
* is a non-zero integer if the path was expressed as bytes.
* The type is deliberately incompatible to prevent misuse.)
* path.fd
* Contains a file descriptor if path.accept_fd was true
* and the caller provided a signed integer instead of any
* sort of string.
*
* WARNING: if your "path" parameter is optional, and is
* unspecified, path_converter will never get called.
* So if you set allow_fd, you *MUST* initialize path.fd = -1
* yourself!
* path.length
* The length of the path in characters, if specified as
* a string.
* path.object
* The original object passed in (if get a PathLike object,
* the result of PyOS_FSPath() is treated as the original object).
* Own a reference to the object.
* path.cleanup
* For internal use only. May point to a temporary object.
* (Pay no attention to the man behind the curtain.)
*
* At most one of path.wide or path.narrow will be non-NULL.
* If path was None and path.nullable was set,
* or if path was an integer and path.allow_fd was set,
* both path.wide and path.narrow will be NULL
* and path.length will be 0.
*
* path_converter takes care to not write to the path_t
* unless it's successful. However it must reset the
* "cleanup" field each time it's called.
*
* Use as follows:
* path_t path;
* memset(&path, 0, sizeof(path));
* PyArg_ParseTuple(args, "O&", path_converter, &path);
* // ... use values from path ...
* path_cleanup(&path);
*
* (Note that if PyArg_Parse fails you don't need to call
* path_cleanup(). However it is safe to do so.)
*/
typedef struct {
const char *function_name;
const char *argument_name;
int nullable;
int allow_fd;
const wchar_t *wide;
#ifdef MS_WINDOWS
BOOL narrow;
#else
const char *narrow;
#endif
int fd;
Py_ssize_t length;
PyObject *object;
PyObject *cleanup;
} path_t;
#ifdef MS_WINDOWS
#define PATH_T_INITIALIZE(function_name, argument_name, nullable, allow_fd) \
{function_name, argument_name, nullable, allow_fd, NULL, FALSE, -1, 0, NULL, NULL}
#else
#define PATH_T_INITIALIZE(function_name, argument_name, nullable, allow_fd) \
{function_name, argument_name, nullable, allow_fd, NULL, NULL, -1, 0, NULL, NULL}
#endif
static void
path_cleanup(path_t *path)
{
Py_CLEAR(path->object);
Py_CLEAR(path->cleanup);
}
static int
path_converter(PyObject *o, void *p)
{
path_t *path = (path_t *)p;
PyObject *bytes = NULL;
Py_ssize_t length = 0;
int is_index, is_buffer, is_bytes, is_unicode;
const char *narrow;
#ifdef MS_WINDOWS
PyObject *wo = NULL;
const wchar_t *wide;
#endif
#define FORMAT_EXCEPTION(exc, fmt) \
PyErr_Format(exc, "%s%s" fmt, \
path->function_name ? path->function_name : "", \
path->function_name ? ": " : "", \
path->argument_name ? path->argument_name : "path")
/* Py_CLEANUP_SUPPORTED support */
if (o == NULL) {
path_cleanup(path);
return 1;
}
/* Ensure it's always safe to call path_cleanup(). */
path->object = path->cleanup = NULL;
/* path->object owns a reference to the original object */
Py_INCREF(o);
if ((o == Py_None) && path->nullable) {
path->wide = NULL;
#ifdef MS_WINDOWS
path->narrow = FALSE;
#else
path->narrow = NULL;
#endif
path->fd = -1;
goto success_exit;
}
/* Only call this here so that we don't treat the return value of
os.fspath() as an fd or buffer. */
is_index = path->allow_fd && PyIndex_Check(o);
is_buffer = PyObject_CheckBuffer(o);
is_bytes = PyBytes_Check(o);
is_unicode = PyUnicode_Check(o);
if (!is_index && !is_buffer && !is_unicode && !is_bytes) {
/* Inline PyOS_FSPath() for better error messages. */
_Py_IDENTIFIER(__fspath__);
PyObject *func = NULL;
func = _PyObject_LookupSpecial(o, &PyId___fspath__);
if (NULL == func) {
goto error_format;
}
/* still owns a reference to the original object */
Py_DECREF(o);
o = _PyObject_CallNoArg(func);
Py_DECREF(func);
if (NULL == o) {
goto error_exit;
}
else if (PyUnicode_Check(o)) {
is_unicode = 1;