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posixmodule.c
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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. '__BORLANDC__' or '_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"
#ifndef MS_WINDOWS
#include "posixmodule.h"
#endif
#if defined(__VMS)
# error "PEP 11: VMS is now unsupported, code will be removed in Python 3.4"
# 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.");
#ifdef HAVE_SYS_UIO_H
#include <sys/uio.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_LANGINFO_H
#include <langinfo.h>
#endif
#ifdef HAVE_SYS_SENDFILE_H
#include <sys/sendfile.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__)
#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
#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_GETCWD 1
#define HAVE_OPENDIR 1
#define HAVE_SYSTEM 1
#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_SYSTEM 1
#define HAVE_WAIT 1
#else
#ifdef _MSC_VER /* Microsoft compiler */
#define HAVE_GETCWD 1
#define HAVE_GETPPID 1
#define HAVE_GETLOGIN 1
#define HAVE_SPAWNV 1
#define HAVE_EXECV 1
#define HAVE_PIPE 1
#define HAVE_SYSTEM 1
#define HAVE_CWAIT 1
#define HAVE_FSYNC 1
#define fsync _commit
#else
#if defined(__VMS)
/* Everything needed is defined in 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
#define HAVE_SYSTEM 1
#define HAVE_WAIT 1
#define HAVE_TTYNAME 1
#endif /* __VMS */
#endif /* _MSC_VER */
#endif /* __BORLANDC__ */
#endif /* ! __WATCOMC__ || __QNX__ */
#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
#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 *);
#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
#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 VOLUME_NAME_DOS
#define VOLUME_NAME_DOS 0x0
#endif
#ifndef VOLUME_NAME_NT
#define VOLUME_NAME_NT 0x2
#endif
#ifndef IO_REPARSE_TAG_SYMLINK
#define IO_REPARSE_TAG_SYMLINK (0xA000000CL)
#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) && defined(WITH_THREAD)
#define USE_CTERMID_R
#endif
/* choose the appropriate stat and fstat functions and return structs */
#undef STAT
#undef FSTAT
#undef STRUCT_STAT
#if defined(MS_WIN64) || defined(MS_WINDOWS)
# define STAT win32_stat
# define LSTAT win32_lstat
# define FSTAT win32_fstat
# define STRUCT_STAT struct win32_stat
#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
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)
{
int overflow;
long result;
if (PyFloat_Check(obj)) {
PyErr_SetString(PyExc_TypeError,
"integer argument expected, got float");
return 0;
}
result = PyLong_AsLongAndOverflow(obj, &overflow);
if (overflow < 0)
goto OverflowDown;
if (!overflow && result == -1) {
/* error or -1 */
if (PyErr_Occurred())
return 0;
*(uid_t *)p = (uid_t)-1;
}
else {
/* unsigned uid_t */
unsigned long uresult;
if (overflow > 0) {
uresult = PyLong_AsUnsignedLong(obj);
if (PyErr_Occurred()) {
if (PyErr_ExceptionMatches(PyExc_OverflowError))
goto OverflowUp;
return 0;
}
if ((uid_t)uresult == (uid_t)-1)
goto OverflowUp;
} else {
if (result < 0)
goto OverflowDown;
uresult = result;
}
if (sizeof(uid_t) < sizeof(long) &&
(unsigned long)(uid_t)uresult != uresult)
goto OverflowUp;
*(uid_t *)p = (uid_t)uresult;
}
return 1;
OverflowDown:
PyErr_SetString(PyExc_OverflowError,
"user id is less than minimum");
return 0;
OverflowUp:
PyErr_SetString(PyExc_OverflowError,
"user id is greater than maximum");
return 0;
}
int
_Py_Gid_Converter(PyObject *obj, void *p)
{
int overflow;
long result;
if (PyFloat_Check(obj)) {
PyErr_SetString(PyExc_TypeError,
"integer argument expected, got float");
return 0;
}
result = PyLong_AsLongAndOverflow(obj, &overflow);
if (overflow < 0)
goto OverflowDown;
if (!overflow && result == -1) {
/* error or -1 */
if (PyErr_Occurred())
return 0;
*(gid_t *)p = (gid_t)-1;
}
else {
/* unsigned gid_t */
unsigned long uresult;
if (overflow > 0) {
uresult = PyLong_AsUnsignedLong(obj);
if (PyErr_Occurred()) {
if (PyErr_ExceptionMatches(PyExc_OverflowError))
goto OverflowUp;
return 0;
}
if ((gid_t)uresult == (gid_t)-1)
goto OverflowUp;
} else {
if (result < 0)
goto OverflowDown;
uresult = result;
}
if (sizeof(gid_t) < sizeof(long) &&
(unsigned long)(gid_t)uresult != uresult)
goto OverflowUp;
*(gid_t *)p = (gid_t)uresult;
}
return 1;
OverflowDown:
PyErr_SetString(PyExc_OverflowError,
"group id is less than minimum");
return 0;
OverflowUp:
PyErr_SetString(PyExc_OverflowError,
"group id is greater than maximum");
return 0;
}
#endif /* MS_WINDOWS */
#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, const char *allowed)
{
int overflow;
long long_value = PyLong_AsLongAndOverflow(o, &overflow);
if (PyFloat_Check(o) ||
(long_value == -1 && !overflow && PyErr_Occurred())) {
PyErr_Clear();
PyErr_Format(PyExc_TypeError,
"argument should be %s, not %.200s",
allowed, Py_TYPE(o)->tp_name);
return 0;
}
if (overflow > 0 || long_value > INT_MAX) {
PyErr_SetString(PyExc_OverflowError,
"signed integer is greater than maximum");
return 0;
}
if (overflow < 0 || long_value < INT_MIN) {
PyErr_SetString(PyExc_OverflowError,
"signed integer 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;
}
return _fd_converter(o, (int *)p, "integer");
}
/*
* 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 extract the char * 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.argument_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.
* 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.
* 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;
wchar_t *wide;
char *narrow;
int fd;
Py_ssize_t length;
PyObject *object;
PyObject *cleanup;
} path_t;
static void
path_cleanup(path_t *path) {
if (path->cleanup) {
Py_DECREF(path->cleanup);
path->cleanup = NULL;
}
}
static int
path_converter(PyObject *o, void *p) {
path_t *path = (path_t *)p;
PyObject *unicode, *bytes;
Py_ssize_t length;
char *narrow;
#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->cleanup = NULL;
if (o == Py_None) {
if (!path->nullable) {
FORMAT_EXCEPTION(PyExc_TypeError,
"can't specify None for %s argument");
return 0;
}
path->wide = NULL;
path->narrow = NULL;
path->length = 0;
path->object = o;
path->fd = -1;
return 1;
}
unicode = PyUnicode_FromObject(o);
if (unicode) {
#ifdef MS_WINDOWS
wchar_t *wide;
length = PyUnicode_GET_SIZE(unicode);
if (length > 32767) {
FORMAT_EXCEPTION(PyExc_ValueError, "%s too long for Windows");
Py_DECREF(unicode);
return 0;
}
wide = PyUnicode_AsUnicode(unicode);
if (!wide) {
Py_DECREF(unicode);
return 0;
}
path->wide = wide;
path->narrow = NULL;
path->length = length;
path->object = o;
path->fd = -1;
path->cleanup = unicode;
return Py_CLEANUP_SUPPORTED;
#else
int converted = PyUnicode_FSConverter(unicode, &bytes);
Py_DECREF(unicode);
if (!converted)
bytes = NULL;
#endif
}
else {
PyErr_Clear();
if (PyObject_CheckBuffer(o))
bytes = PyBytes_FromObject(o);
else
bytes = NULL;
if (!bytes) {
PyErr_Clear();
if (path->allow_fd) {
int fd;
int result = _fd_converter(o, &fd,
"string, bytes or integer");
if (result) {
path->wide = NULL;
path->narrow = NULL;
path->length = 0;
path->object = o;
path->fd = fd;
return result;
}
}
}
}
if (!bytes) {
if (!PyErr_Occurred())
FORMAT_EXCEPTION(PyExc_TypeError, "illegal type for %s parameter");
return 0;
}
#ifdef MS_WINDOWS
if (win32_warn_bytes_api()) {
Py_DECREF(bytes);
return 0;
}
#endif
length = PyBytes_GET_SIZE(bytes);
#ifdef MS_WINDOWS
if (length > MAX_PATH) {
FORMAT_EXCEPTION(PyExc_ValueError, "%s too long for Windows");
Py_DECREF(bytes);
return 0;
}
#endif
narrow = PyBytes_AS_STRING(bytes);
if (length != strlen(narrow)) {
FORMAT_EXCEPTION(PyExc_ValueError, "embedded NUL character in %s");
Py_DECREF(bytes);
return 0;
}
path->wide = NULL;
path->narrow = narrow;
path->length = length;
path->object = o;
path->fd = -1;
path->cleanup = bytes;
return Py_CLEANUP_SUPPORTED;
}
static void
argument_unavailable_error(char *function_name, char *argument_name) {
PyErr_Format(PyExc_NotImplementedError,
"%s%s%s unavailable on this platform",
(function_name != NULL) ? function_name : "",
(function_name != NULL) ? ": ": "",
argument_name);
}
static int
dir_fd_unavailable(PyObject *o, void *p)
{
int dir_fd;
if (!dir_fd_converter(o, &dir_fd))
return 0;
if (dir_fd != DEFAULT_DIR_FD) {
argument_unavailable_error(NULL, "dir_fd");
return 0;
}
*(int *)p = dir_fd;
return 1;
}
static int
fd_specified(char *function_name, int fd) {
if (fd == -1)
return 0;
argument_unavailable_error(function_name, "fd");
return 1;
}
static int
follow_symlinks_specified(char *function_name, int follow_symlinks) {
if (follow_symlinks)
return 0;
argument_unavailable_error(function_name, "follow_symlinks");
return 1;
}
static int
path_and_dir_fd_invalid(char *function_name, path_t *path, int dir_fd) {
if (!path->narrow && !path->wide && (dir_fd != DEFAULT_DIR_FD)) {
PyErr_Format(PyExc_ValueError,
"%s: can't specify dir_fd without matching path",
function_name);
return 1;
}
return 0;
}
static int
dir_fd_and_fd_invalid(char *function_name, int dir_fd, int fd) {
if ((dir_fd != DEFAULT_DIR_FD) && (fd != -1)) {
PyErr_Format(PyExc_ValueError,
"%s: can't specify both dir_fd and fd",
function_name);
return 1;
}
return 0;
}
static int
fd_and_follow_symlinks_invalid(char *function_name, int fd,
int follow_symlinks) {
if ((fd > 0) && (!follow_symlinks)) {
PyErr_Format(PyExc_ValueError,
"%s: cannot use fd and follow_symlinks together",
function_name);
return 1;
}
return 0;
}
static int
dir_fd_and_follow_symlinks_invalid(char *function_name, int dir_fd,
int follow_symlinks) {
if ((dir_fd != DEFAULT_DIR_FD) && (!follow_symlinks)) {
PyErr_Format(PyExc_ValueError,
"%s: cannot use dir_fd and follow_symlinks together",
function_name);
return 1;
}
return 0;
}
/* A helper used by a number of POSIX-only functions */
#ifndef MS_WINDOWS
static int
_parse_off_t(PyObject* arg, void* addr)
{
#if !defined(HAVE_LARGEFILE_SUPPORT)
*((off_t*)addr) = PyLong_AsLong(arg);
#else
*((off_t*)addr) = PyLong_AsLongLong(arg);
#endif
if (PyErr_Occurred())
return 0;
return 1;
}
#endif
#if defined _MSC_VER && _MSC_VER >= 1400
/* Microsoft CRT in VS2005 and higher will verify that a filehandle is
* valid and raise an assertion if it isn't.
* Normally, an invalid fd is likely to be a C program error and therefore
* an assertion can be useful, but it does contradict the POSIX standard
* which for write(2) states:
* "Otherwise, -1 shall be returned and errno set to indicate the error."
* "[EBADF] The fildes argument is not a valid file descriptor open for
* writing."
* Furthermore, python allows the user to enter any old integer
* as a fd and should merely raise a python exception on error.
* The Microsoft CRT doesn't provide an official way to check for the
* validity of a file descriptor, but we can emulate its internal behaviour
* by using the exported __pinfo data member and knowledge of the
* internal structures involved.
* The structures below must be updated for each version of visual studio
* according to the file internal.h in the CRT source, until MS comes
* up with a less hacky way to do this.
* (all of this is to avoid globally modifying the CRT behaviour using
* _set_invalid_parameter_handler() and _CrtSetReportMode())
*/
/* The actual size of the structure is determined at runtime.
* Only the first items must be present.
*/
typedef struct {
intptr_t osfhnd;
char osfile;
} my_ioinfo;
extern __declspec(dllimport) char * __pioinfo[];
#define IOINFO_L2E 5
#define IOINFO_ARRAY_ELTS (1 << IOINFO_L2E)
#define IOINFO_ARRAYS 64
#define _NHANDLE_ (IOINFO_ARRAYS * IOINFO_ARRAY_ELTS)
#define FOPEN 0x01
#define _NO_CONSOLE_FILENO (intptr_t)-2
/* This function emulates what the windows CRT does to validate file handles */
int
_PyVerify_fd(int fd)
{
const int i1 = fd >> IOINFO_L2E;
const int i2 = fd & ((1 << IOINFO_L2E) - 1);
static size_t sizeof_ioinfo = 0;
/* Determine the actual size of the ioinfo structure,
* as used by the CRT loaded in memory
*/
if (sizeof_ioinfo == 0 && __pioinfo[0] != NULL) {
sizeof_ioinfo = _msize(__pioinfo[0]) / IOINFO_ARRAY_ELTS;
}
if (sizeof_ioinfo == 0) {
/* This should not happen... */
goto fail;
}
/* See that it isn't a special CLEAR fileno */
if (fd != _NO_CONSOLE_FILENO) {
/* Microsoft CRT would check that 0<=fd<_nhandle but we can't do that. Instead
* we check pointer validity and other info
*/
if (0 <= i1 && i1 < IOINFO_ARRAYS && __pioinfo[i1] != NULL) {
/* finally, check that the file is open */
my_ioinfo* info = (my_ioinfo*)(__pioinfo[i1] + i2 * sizeof_ioinfo);
if (info->osfile & FOPEN) {
return 1;
}
}
}
fail:
errno = EBADF;
return 0;
}
/* the special case of checking dup2. The target fd must be in a sensible range */
static int
_PyVerify_fd_dup2(int fd1, int fd2)
{
if (!_PyVerify_fd(fd1))
return 0;
if (fd2 == _NO_CONSOLE_FILENO)
return 0;
if ((unsigned)fd2 < _NHANDLE_)
return 1;
else
return 0;