w32.c 247 KB
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/* Utility and Unix shadow routines for GNU Emacs on the Microsoft Windows API.
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Copyright (C) 1994-1995, 2000-2014 Free Software Foundation, Inc.
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This file is part of GNU Emacs.

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GNU Emacs is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
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GNU Emacs is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
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along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
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/*
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   Geoff Voelker (voelker@cs.washington.edu)                         7-29-94
*/
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#include <mingw_time.h>
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#include <stddef.h> /* for offsetof */
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#include <stdlib.h>
#include <stdio.h>
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#include <float.h>	/* for DBL_EPSILON */
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#include <io.h>
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#include <errno.h>
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#include <fcntl.h>
#include <ctype.h>
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#include <signal.h>
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#include <sys/file.h>
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#include <time.h>	/* must be before nt/inc/sys/time.h, for MinGW64 */
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#include <sys/time.h>
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#include <sys/utime.h>
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#include <math.h>
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/* must include CRT headers *before* config.h */
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#include <config.h>
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#include <mbstring.h>	/* for _mbspbrk, _mbslwr, _mbsrchr, ... */
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#undef access
#undef chdir
#undef chmod
#undef creat
#undef ctime
#undef fopen
#undef link
#undef mkdir
#undef open
#undef rename
#undef rmdir
#undef unlink

#undef close
#undef dup
#undef dup2
#undef pipe
#undef read
#undef write
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#undef strerror

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#undef localtime

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#include "lisp.h"
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#include "epaths.h"	/* for SHELL */
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#include <pwd.h>
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#include <grp.h>
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/* MinGW64 (_W64) defines these in its _mingw.h.  */
#if defined(__GNUC__) && !defined(_W64)
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#define _ANONYMOUS_UNION
#define _ANONYMOUS_STRUCT
#endif
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#include <windows.h>
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/* Some versions of compiler define MEMORYSTATUSEX, some don't, so we
   use a different name to avoid compilation problems.  */
typedef struct _MEMORY_STATUS_EX {
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  DWORD dwLength;
  DWORD dwMemoryLoad;
  DWORDLONG ullTotalPhys;
  DWORDLONG ullAvailPhys;
  DWORDLONG ullTotalPageFile;
  DWORDLONG ullAvailPageFile;
  DWORDLONG ullTotalVirtual;
  DWORDLONG ullAvailVirtual;
  DWORDLONG ullAvailExtendedVirtual;
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} MEMORY_STATUS_EX,*LPMEMORY_STATUS_EX;
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/* These are here so that GDB would know about these data types.  This
   allows to attach GDB to Emacs when a fatal exception is triggered
   and Windows pops up the "application needs to be closed" dialog.
   At that point, _gnu_exception_handler, the top-level exception
   handler installed by the MinGW startup code, is somewhere on the
   call-stack of the main thread, so going to that call frame and
   looking at the argument to _gnu_exception_handler, which is a
   PEXCEPTION_POINTERS pointer, can reveal the exception code
   (excptr->ExceptionRecord->ExceptionCode) and the address where the
   exception happened (excptr->ExceptionRecord->ExceptionAddress), as
   well as some additional information specific to the exception.  */
PEXCEPTION_POINTERS excptr;
PEXCEPTION_RECORD excprec;
PCONTEXT ctxrec;

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#include <lmcons.h>
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#include <shlobj.h>
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#include <tlhelp32.h>
#include <psapi.h>
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#ifndef _MSC_VER
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#include <w32api.h>
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#endif
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#if _WIN32_WINNT < 0x0500
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#if !defined (__MINGW32__) || __W32API_MAJOR_VERSION < 3 || (__W32API_MAJOR_VERSION == 3 && __W32API_MINOR_VERSION < 15)
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/* This either is not in psapi.h or guarded by higher value of
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   _WIN32_WINNT than what we use.  w32api supplied with MinGW 3.15
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   defines it in psapi.h  */
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typedef struct _PROCESS_MEMORY_COUNTERS_EX {
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  DWORD  cb;
  DWORD  PageFaultCount;
  SIZE_T PeakWorkingSetSize;
  SIZE_T WorkingSetSize;
  SIZE_T QuotaPeakPagedPoolUsage;
  SIZE_T QuotaPagedPoolUsage;
  SIZE_T QuotaPeakNonPagedPoolUsage;
  SIZE_T QuotaNonPagedPoolUsage;
  SIZE_T PagefileUsage;
  SIZE_T PeakPagefileUsage;
  SIZE_T PrivateUsage;
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} PROCESS_MEMORY_COUNTERS_EX,*PPROCESS_MEMORY_COUNTERS_EX;
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#endif
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#endif
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#include <winioctl.h>
#include <aclapi.h>
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#include <sddl.h>

#include <sys/acl.h>
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#include <acl.h>
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/* This is not in MinGW's sddl.h (but they are in MSVC headers), so we
   define them by hand if not already defined.  */
#ifndef SDDL_REVISION_1
#define SDDL_REVISION_1	1
#endif	/* SDDL_REVISION_1 */
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#if defined(_MSC_VER) || defined(_W64)
/* MSVC and MinGW64 don't provide the definition of
   REPARSE_DATA_BUFFER and the associated macros, except on ntifs.h,
   which cannot be included because it triggers conflicts with other
   Windows API headers.  So we define it here by hand.  */
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typedef struct _REPARSE_DATA_BUFFER {
    ULONG  ReparseTag;
    USHORT ReparseDataLength;
    USHORT Reserved;
    union {
        struct {
            USHORT SubstituteNameOffset;
            USHORT SubstituteNameLength;
            USHORT PrintNameOffset;
            USHORT PrintNameLength;
            ULONG Flags;
            WCHAR PathBuffer[1];
        } SymbolicLinkReparseBuffer;
        struct {
            USHORT SubstituteNameOffset;
            USHORT SubstituteNameLength;
            USHORT PrintNameOffset;
            USHORT PrintNameLength;
            WCHAR PathBuffer[1];
        } MountPointReparseBuffer;
        struct {
            UCHAR  DataBuffer[1];
        } GenericReparseBuffer;
    } DUMMYUNIONNAME;
} REPARSE_DATA_BUFFER, *PREPARSE_DATA_BUFFER;

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#ifndef FILE_DEVICE_FILE_SYSTEM
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#define FILE_DEVICE_FILE_SYSTEM	9
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#endif
#ifndef METHOD_BUFFERED
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#define METHOD_BUFFERED	        0
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#endif
#ifndef FILE_ANY_ACCESS
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#define FILE_ANY_ACCESS	        0x00000000
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#endif
#ifndef CTL_CODE
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#define CTL_CODE(t,f,m,a)       (((t)<<16)|((a)<<14)|((f)<<2)|(m))
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#endif
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/* MinGW64 defines FSCTL_GET_REPARSE_POINT on winioctl.h.  */
#ifndef FSCTL_GET_REPARSE_POINT
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#define FSCTL_GET_REPARSE_POINT \
  CTL_CODE(FILE_DEVICE_FILE_SYSTEM, 42, METHOD_BUFFERED, FILE_ANY_ACCESS)
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#endif
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#endif
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/* TCP connection support.  */
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#include <sys/socket.h>
#undef socket
#undef bind
#undef connect
#undef htons
#undef ntohs
#undef inet_addr
#undef gethostname
#undef gethostbyname
#undef getservbyname
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#undef getpeername
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#undef shutdown
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#undef setsockopt
#undef listen
#undef getsockname
#undef accept
#undef recvfrom
#undef sendto
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#include <iphlpapi.h>	/* should be after winsock2.h */

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#include "w32.h"
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#include <dirent.h>
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#include "w32common.h"
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#include "w32heap.h"
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#include "w32select.h"
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#include "systime.h"
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#include "dispextern.h"		/* for xstrcasecmp */
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#include "coding.h"		/* for Vlocale_coding_system */
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#include "careadlinkat.h"
#include "allocator.h"

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/* For serial_configure and serial_open.  */
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#include "process.h"

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typedef HRESULT (WINAPI * ShGetFolderPath_fn)
  (IN HWND, IN int, IN HANDLE, IN DWORD, OUT char *);

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Lisp_Object QCloaded_from;

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void globals_of_w32 (void);
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static DWORD get_rid (PSID);
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static int is_symlink (const char *);
static char * chase_symlinks (const char *);
static int enable_privilege (LPCTSTR, BOOL, TOKEN_PRIVILEGES *);
static int restore_privilege (TOKEN_PRIVILEGES *);
static BOOL WINAPI revert_to_self (void);
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static int sys_access (const char *, int);
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extern void *e_malloc (size_t);
extern int sys_select (int, SELECT_TYPE *, SELECT_TYPE *, SELECT_TYPE *,
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		       struct timespec *, void *);
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extern int sys_dup (int);

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/* Initialization states.

   WARNING: If you add any more such variables for additional APIs,
            you MUST add initialization for them to globals_of_w32
            below.  This is because these variables might get set
            to non-NULL values during dumping, but the dumped Emacs
            cannot reuse those values, because it could be run on a
            different version of the OS, where API addresses are
            different.  */
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static BOOL g_b_init_is_windows_9x;
static BOOL g_b_init_open_process_token;
static BOOL g_b_init_get_token_information;
static BOOL g_b_init_lookup_account_sid;
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static BOOL g_b_init_get_sid_sub_authority;
static BOOL g_b_init_get_sid_sub_authority_count;
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static BOOL g_b_init_get_security_info;
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static BOOL g_b_init_get_file_security_w;
static BOOL g_b_init_get_file_security_a;
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static BOOL g_b_init_get_security_descriptor_owner;
static BOOL g_b_init_get_security_descriptor_group;
static BOOL g_b_init_is_valid_sid;
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static BOOL g_b_init_create_toolhelp32_snapshot;
static BOOL g_b_init_process32_first;
static BOOL g_b_init_process32_next;
static BOOL g_b_init_open_thread_token;
static BOOL g_b_init_impersonate_self;
static BOOL g_b_init_revert_to_self;
static BOOL g_b_init_get_process_memory_info;
static BOOL g_b_init_get_process_working_set_size;
static BOOL g_b_init_global_memory_status;
static BOOL g_b_init_global_memory_status_ex;
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static BOOL g_b_init_get_length_sid;
static BOOL g_b_init_equal_sid;
static BOOL g_b_init_copy_sid;
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static BOOL g_b_init_get_native_system_info;
static BOOL g_b_init_get_system_times;
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static BOOL g_b_init_create_symbolic_link_w;
static BOOL g_b_init_create_symbolic_link_a;
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static BOOL g_b_init_get_security_descriptor_dacl;
static BOOL g_b_init_convert_sd_to_sddl;
static BOOL g_b_init_convert_sddl_to_sd;
static BOOL g_b_init_is_valid_security_descriptor;
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static BOOL g_b_init_set_file_security_w;
static BOOL g_b_init_set_file_security_a;
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static BOOL g_b_init_set_named_security_info_w;
static BOOL g_b_init_set_named_security_info_a;
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static BOOL g_b_init_get_adapters_info;
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/*
  BEGIN: Wrapper functions around OpenProcessToken
  and other functions in advapi32.dll that are only
  supported in Windows NT / 2k / XP
*/
  /* ** Function pointer typedefs ** */
typedef BOOL (WINAPI * OpenProcessToken_Proc) (
    HANDLE ProcessHandle,
    DWORD DesiredAccess,
    PHANDLE TokenHandle);
typedef BOOL (WINAPI * GetTokenInformation_Proc) (
    HANDLE TokenHandle,
    TOKEN_INFORMATION_CLASS TokenInformationClass,
    LPVOID TokenInformation,
    DWORD TokenInformationLength,
    PDWORD ReturnLength);
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typedef BOOL (WINAPI * GetProcessTimes_Proc) (
    HANDLE process_handle,
    LPFILETIME creation_time,
    LPFILETIME exit_time,
    LPFILETIME kernel_time,
    LPFILETIME user_time);

GetProcessTimes_Proc get_process_times_fn = NULL;

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#ifdef _UNICODE
const char * const LookupAccountSid_Name = "LookupAccountSidW";
#else
const char * const LookupAccountSid_Name = "LookupAccountSidA";
#endif
typedef BOOL (WINAPI * LookupAccountSid_Proc) (
    LPCTSTR lpSystemName,
    PSID Sid,
    LPTSTR Name,
    LPDWORD cbName,
    LPTSTR DomainName,
    LPDWORD cbDomainName,
    PSID_NAME_USE peUse);
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typedef PDWORD (WINAPI * GetSidSubAuthority_Proc) (
    PSID pSid,
    DWORD n);
typedef PUCHAR (WINAPI * GetSidSubAuthorityCount_Proc) (
    PSID pSid);
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typedef DWORD (WINAPI * GetSecurityInfo_Proc) (
    HANDLE handle,
    SE_OBJECT_TYPE ObjectType,
    SECURITY_INFORMATION SecurityInfo,
    PSID *ppsidOwner,
    PSID *ppsidGroup,
    PACL *ppDacl,
    PACL *ppSacl,
    PSECURITY_DESCRIPTOR *ppSecurityDescriptor);
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typedef BOOL (WINAPI * GetFileSecurityW_Proc) (
    LPCWSTR lpFileName,
    SECURITY_INFORMATION RequestedInformation,
    PSECURITY_DESCRIPTOR pSecurityDescriptor,
    DWORD nLength,
    LPDWORD lpnLengthNeeded);
typedef BOOL (WINAPI * GetFileSecurityA_Proc) (
    LPCSTR lpFileName,
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    SECURITY_INFORMATION RequestedInformation,
    PSECURITY_DESCRIPTOR pSecurityDescriptor,
    DWORD nLength,
    LPDWORD lpnLengthNeeded);
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typedef BOOL (WINAPI *SetFileSecurityW_Proc) (
    LPCWSTR lpFileName,
    SECURITY_INFORMATION SecurityInformation,
    PSECURITY_DESCRIPTOR pSecurityDescriptor);
typedef BOOL (WINAPI *SetFileSecurityA_Proc) (
    LPCSTR lpFileName,
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    SECURITY_INFORMATION SecurityInformation,
    PSECURITY_DESCRIPTOR pSecurityDescriptor);
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typedef DWORD (WINAPI *SetNamedSecurityInfoW_Proc) (
    LPCWSTR lpObjectName,
    SE_OBJECT_TYPE ObjectType,
    SECURITY_INFORMATION SecurityInformation,
    PSID psidOwner,
    PSID psidGroup,
    PACL pDacl,
    PACL pSacl);
typedef DWORD (WINAPI *SetNamedSecurityInfoA_Proc) (
    LPCSTR lpObjectName,
    SE_OBJECT_TYPE ObjectType,
    SECURITY_INFORMATION SecurityInformation,
    PSID psidOwner,
    PSID psidGroup,
    PACL pDacl,
    PACL pSacl);
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typedef BOOL (WINAPI * GetSecurityDescriptorOwner_Proc) (
    PSECURITY_DESCRIPTOR pSecurityDescriptor,
    PSID *pOwner,
    LPBOOL lpbOwnerDefaulted);
typedef BOOL (WINAPI * GetSecurityDescriptorGroup_Proc) (
    PSECURITY_DESCRIPTOR pSecurityDescriptor,
    PSID *pGroup,
    LPBOOL lpbGroupDefaulted);
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typedef BOOL (WINAPI *GetSecurityDescriptorDacl_Proc) (
    PSECURITY_DESCRIPTOR pSecurityDescriptor,
    LPBOOL lpbDaclPresent,
    PACL *pDacl,
    LPBOOL lpbDaclDefaulted);
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typedef BOOL (WINAPI * IsValidSid_Proc) (
    PSID sid);
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typedef HANDLE (WINAPI * CreateToolhelp32Snapshot_Proc) (
    DWORD dwFlags,
    DWORD th32ProcessID);
typedef BOOL (WINAPI * Process32First_Proc) (
    HANDLE hSnapshot,
    LPPROCESSENTRY32 lppe);
typedef BOOL (WINAPI * Process32Next_Proc) (
    HANDLE hSnapshot,
    LPPROCESSENTRY32 lppe);
typedef BOOL (WINAPI * OpenThreadToken_Proc) (
    HANDLE ThreadHandle,
    DWORD DesiredAccess,
    BOOL OpenAsSelf,
    PHANDLE TokenHandle);
typedef BOOL (WINAPI * ImpersonateSelf_Proc) (
    SECURITY_IMPERSONATION_LEVEL ImpersonationLevel);
typedef BOOL (WINAPI * RevertToSelf_Proc) (void);
typedef BOOL (WINAPI * GetProcessMemoryInfo_Proc) (
    HANDLE Process,
    PPROCESS_MEMORY_COUNTERS ppsmemCounters,
    DWORD cb);
typedef BOOL (WINAPI * GetProcessWorkingSetSize_Proc) (
    HANDLE hProcess,
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    PSIZE_T lpMinimumWorkingSetSize,
    PSIZE_T lpMaximumWorkingSetSize);
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typedef BOOL (WINAPI * GlobalMemoryStatus_Proc) (
    LPMEMORYSTATUS lpBuffer);
typedef BOOL (WINAPI * GlobalMemoryStatusEx_Proc) (
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    LPMEMORY_STATUS_EX lpBuffer);
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typedef BOOL (WINAPI * CopySid_Proc) (
    DWORD nDestinationSidLength,
    PSID pDestinationSid,
    PSID pSourceSid);
typedef BOOL (WINAPI * EqualSid_Proc) (
    PSID pSid1,
    PSID pSid2);
typedef DWORD (WINAPI * GetLengthSid_Proc) (
    PSID pSid);
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typedef void (WINAPI * GetNativeSystemInfo_Proc) (
    LPSYSTEM_INFO lpSystemInfo);
typedef BOOL (WINAPI * GetSystemTimes_Proc) (
    LPFILETIME lpIdleTime,
    LPFILETIME lpKernelTime,
    LPFILETIME lpUserTime);
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typedef BOOLEAN (WINAPI *CreateSymbolicLinkW_Proc) (
    LPCWSTR lpSymlinkFileName,
    LPCWSTR lpTargetFileName,
    DWORD  dwFlags);
typedef BOOLEAN (WINAPI *CreateSymbolicLinkA_Proc) (
    LPCSTR lpSymlinkFileName,
    LPCSTR lpTargetFileName,
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    DWORD  dwFlags);
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typedef BOOL (WINAPI *ConvertStringSecurityDescriptorToSecurityDescriptor_Proc) (
    LPCTSTR StringSecurityDescriptor,
    DWORD StringSDRevision,
    PSECURITY_DESCRIPTOR  *SecurityDescriptor,
    PULONG  SecurityDescriptorSize);
typedef BOOL (WINAPI *ConvertSecurityDescriptorToStringSecurityDescriptor_Proc) (
    PSECURITY_DESCRIPTOR  SecurityDescriptor,
    DWORD RequestedStringSDRevision,
    SECURITY_INFORMATION SecurityInformation,
    LPTSTR  *StringSecurityDescriptor,
    PULONG StringSecurityDescriptorLen);
typedef BOOL (WINAPI *IsValidSecurityDescriptor_Proc) (PSECURITY_DESCRIPTOR);
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typedef DWORD (WINAPI *GetAdaptersInfo_Proc) (
    PIP_ADAPTER_INFO pAdapterInfo,
    PULONG pOutBufLen);
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int (WINAPI *pMultiByteToWideChar)(UINT,DWORD,LPCSTR,int,LPWSTR,int);
int (WINAPI *pWideCharToMultiByte)(UINT,DWORD,LPCWSTR,int,LPSTR,int,LPCSTR,LPBOOL);

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  /* ** A utility function ** */
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static BOOL
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is_windows_9x (void)
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{
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  static BOOL s_b_ret = 0;
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  OSVERSIONINFO os_ver;
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  if (g_b_init_is_windows_9x == 0)
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    {
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      g_b_init_is_windows_9x = 1;
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      ZeroMemory (&os_ver, sizeof (OSVERSIONINFO));
      os_ver.dwOSVersionInfoSize = sizeof (OSVERSIONINFO);
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      if (GetVersionEx (&os_ver))
        {
          s_b_ret = (os_ver.dwPlatformId == VER_PLATFORM_WIN32_WINDOWS);
        }
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    }
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  return s_b_ret;
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}

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static Lisp_Object ltime (ULONGLONG);

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/* Get total user and system times for get-internal-run-time.
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   Returns a list of integers if the times are provided by the OS
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   (NT derivatives), otherwise it returns the result of current-time. */
Lisp_Object
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w32_get_internal_run_time (void)
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{
  if (get_process_times_fn)
    {
      FILETIME create, exit, kernel, user;
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      HANDLE proc = GetCurrentProcess ();
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      if ((*get_process_times_fn) (proc, &create, &exit, &kernel, &user))
        {
          LARGE_INTEGER user_int, kernel_int, total;
          user_int.LowPart = user.dwLowDateTime;
          user_int.HighPart = user.dwHighDateTime;
          kernel_int.LowPart = kernel.dwLowDateTime;
          kernel_int.HighPart = kernel.dwHighDateTime;
          total.QuadPart = user_int.QuadPart + kernel_int.QuadPart;
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	  return ltime (total.QuadPart);
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        }
    }

  return Fcurrent_time ();
}

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  /* ** The wrapper functions ** */

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static BOOL WINAPI
open_process_token (HANDLE ProcessHandle,
		    DWORD DesiredAccess,
		    PHANDLE TokenHandle)
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{
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  static OpenProcessToken_Proc s_pfn_Open_Process_Token = NULL;
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  HMODULE hm_advapi32 = NULL;
  if (is_windows_9x () == TRUE)
    {
      return FALSE;
    }
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  if (g_b_init_open_process_token == 0)
    {
      g_b_init_open_process_token = 1;
      hm_advapi32 = LoadLibrary ("Advapi32.dll");
      s_pfn_Open_Process_Token =
        (OpenProcessToken_Proc) GetProcAddress (hm_advapi32, "OpenProcessToken");
    }
  if (s_pfn_Open_Process_Token == NULL)
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    {
      return FALSE;
    }
  return (
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      s_pfn_Open_Process_Token (
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          ProcessHandle,
          DesiredAccess,
          TokenHandle)
      );
}

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static BOOL WINAPI
get_token_information (HANDLE TokenHandle,
		       TOKEN_INFORMATION_CLASS TokenInformationClass,
		       LPVOID TokenInformation,
		       DWORD TokenInformationLength,
		       PDWORD ReturnLength)
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{
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  static GetTokenInformation_Proc s_pfn_Get_Token_Information = NULL;
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  HMODULE hm_advapi32 = NULL;
  if (is_windows_9x () == TRUE)
    {
      return FALSE;
    }
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  if (g_b_init_get_token_information == 0)
    {
      g_b_init_get_token_information = 1;
      hm_advapi32 = LoadLibrary ("Advapi32.dll");
      s_pfn_Get_Token_Information =
        (GetTokenInformation_Proc) GetProcAddress (hm_advapi32, "GetTokenInformation");
    }
  if (s_pfn_Get_Token_Information == NULL)
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    {
      return FALSE;
    }
  return (
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      s_pfn_Get_Token_Information (
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          TokenHandle,
          TokenInformationClass,
          TokenInformation,
          TokenInformationLength,
          ReturnLength)
      );
}

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static BOOL WINAPI
lookup_account_sid (LPCTSTR lpSystemName,
		    PSID Sid,
		    LPTSTR Name,
		    LPDWORD cbName,
		    LPTSTR DomainName,
		    LPDWORD cbDomainName,
		    PSID_NAME_USE peUse)
604
{
605
  static LookupAccountSid_Proc s_pfn_Lookup_Account_Sid = NULL;
606 607 608 609 610
  HMODULE hm_advapi32 = NULL;
  if (is_windows_9x () == TRUE)
    {
      return FALSE;
    }
611 612 613 614 615 616 617 618
  if (g_b_init_lookup_account_sid == 0)
    {
      g_b_init_lookup_account_sid = 1;
      hm_advapi32 = LoadLibrary ("Advapi32.dll");
      s_pfn_Lookup_Account_Sid =
        (LookupAccountSid_Proc) GetProcAddress (hm_advapi32, LookupAccountSid_Name);
    }
  if (s_pfn_Lookup_Account_Sid == NULL)
619 620 621 622
    {
      return FALSE;
    }
  return (
623
      s_pfn_Lookup_Account_Sid (
624 625 626 627 628 629 630 631 632 633
          lpSystemName,
          Sid,
          Name,
          cbName,
          DomainName,
          cbDomainName,
          peUse)
      );
}

634 635
static PDWORD WINAPI
get_sid_sub_authority (PSID pSid, DWORD n)
636 637
{
  static GetSidSubAuthority_Proc s_pfn_Get_Sid_Sub_Authority = NULL;
638
  static DWORD zero = 0U;
639 640 641
  HMODULE hm_advapi32 = NULL;
  if (is_windows_9x () == TRUE)
    {
642
      return &zero;
643 644 645 646 647 648 649 650 651 652 653
    }
  if (g_b_init_get_sid_sub_authority == 0)
    {
      g_b_init_get_sid_sub_authority = 1;
      hm_advapi32 = LoadLibrary ("Advapi32.dll");
      s_pfn_Get_Sid_Sub_Authority =
        (GetSidSubAuthority_Proc) GetProcAddress (
            hm_advapi32, "GetSidSubAuthority");
    }
  if (s_pfn_Get_Sid_Sub_Authority == NULL)
    {
654
      return &zero;
655 656 657 658
    }
  return (s_pfn_Get_Sid_Sub_Authority (pSid, n));
}

659 660
static PUCHAR WINAPI
get_sid_sub_authority_count (PSID pSid)
661 662
{
  static GetSidSubAuthorityCount_Proc s_pfn_Get_Sid_Sub_Authority_Count = NULL;
663
  static UCHAR zero = 0U;
664 665 666
  HMODULE hm_advapi32 = NULL;
  if (is_windows_9x () == TRUE)
    {
667
      return &zero;
668 669 670 671 672 673 674 675 676 677 678
    }
  if (g_b_init_get_sid_sub_authority_count == 0)
    {
      g_b_init_get_sid_sub_authority_count = 1;
      hm_advapi32 = LoadLibrary ("Advapi32.dll");
      s_pfn_Get_Sid_Sub_Authority_Count =
        (GetSidSubAuthorityCount_Proc) GetProcAddress (
            hm_advapi32, "GetSidSubAuthorityCount");
    }
  if (s_pfn_Get_Sid_Sub_Authority_Count == NULL)
    {
679
      return &zero;
680 681 682 683
    }
  return (s_pfn_Get_Sid_Sub_Authority_Count (pSid));
}

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
static DWORD WINAPI
get_security_info (HANDLE handle,
		   SE_OBJECT_TYPE ObjectType,
		   SECURITY_INFORMATION SecurityInfo,
		   PSID *ppsidOwner,
		   PSID *ppsidGroup,
		   PACL *ppDacl,
		   PACL *ppSacl,
		   PSECURITY_DESCRIPTOR *ppSecurityDescriptor)
{
  static GetSecurityInfo_Proc s_pfn_Get_Security_Info = NULL;
  HMODULE hm_advapi32 = NULL;
  if (is_windows_9x () == TRUE)
    {
      return FALSE;
    }
  if (g_b_init_get_security_info == 0)
    {
      g_b_init_get_security_info = 1;
      hm_advapi32 = LoadLibrary ("Advapi32.dll");
      s_pfn_Get_Security_Info =
        (GetSecurityInfo_Proc) GetProcAddress (
            hm_advapi32, "GetSecurityInfo");
    }
  if (s_pfn_Get_Security_Info == NULL)
    {
      return FALSE;
    }
  return (s_pfn_Get_Security_Info (handle, ObjectType, SecurityInfo,
				   ppsidOwner, ppsidGroup, ppDacl, ppSacl,
				   ppSecurityDescriptor));
}

717
static BOOL WINAPI
718
get_file_security (const char *lpFileName,
719 720 721 722
		   SECURITY_INFORMATION RequestedInformation,
		   PSECURITY_DESCRIPTOR pSecurityDescriptor,
		   DWORD nLength,
		   LPDWORD lpnLengthNeeded)
723
{
724 725
  static GetFileSecurityA_Proc s_pfn_Get_File_SecurityA = NULL;
  static GetFileSecurityW_Proc s_pfn_Get_File_SecurityW = NULL;
726 727 728
  HMODULE hm_advapi32 = NULL;
  if (is_windows_9x () == TRUE)
    {
729
      errno = ENOTSUP;
730 731
      return FALSE;
    }
732
  if (w32_unicode_filenames)
733
    {
734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752
      wchar_t filename_w[MAX_PATH];

      if (g_b_init_get_file_security_w == 0)
	{
	  g_b_init_get_file_security_w = 1;
	  hm_advapi32 = LoadLibrary ("Advapi32.dll");
	  s_pfn_Get_File_SecurityW =
	    (GetFileSecurityW_Proc) GetProcAddress (hm_advapi32,
						   "GetFileSecurityW");
	}
      if (s_pfn_Get_File_SecurityW == NULL)
	{
	  errno = ENOTSUP;
	  return FALSE;
	}
      filename_to_utf16 (lpFileName, filename_w);
      return (s_pfn_Get_File_SecurityW (filename_w, RequestedInformation,
					pSecurityDescriptor, nLength,
					lpnLengthNeeded));
753
    }
754
  else
755
    {
756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774
      char filename_a[MAX_PATH];

      if (g_b_init_get_file_security_a == 0)
	{
	  g_b_init_get_file_security_a = 1;
	  hm_advapi32 = LoadLibrary ("Advapi32.dll");
	  s_pfn_Get_File_SecurityA =
	    (GetFileSecurityA_Proc) GetProcAddress (hm_advapi32,
						   "GetFileSecurityA");
	}
      if (s_pfn_Get_File_SecurityA == NULL)
	{
	  errno = ENOTSUP;
	  return FALSE;
	}
      filename_to_ansi (lpFileName, filename_a);
      return (s_pfn_Get_File_SecurityA (filename_a, RequestedInformation,
					pSecurityDescriptor, nLength,
					lpnLengthNeeded));
775 776 777
    }
}

778
static BOOL WINAPI
779
set_file_security (const char *lpFileName,
780 781 782
		   SECURITY_INFORMATION SecurityInformation,
		   PSECURITY_DESCRIPTOR pSecurityDescriptor)
{
783 784
  static SetFileSecurityW_Proc s_pfn_Set_File_SecurityW = NULL;
  static SetFileSecurityA_Proc s_pfn_Set_File_SecurityA = NULL;
785 786 787 788 789 790
  HMODULE hm_advapi32 = NULL;
  if (is_windows_9x () == TRUE)
    {
      errno = ENOTSUP;
      return FALSE;
    }
791
  if (w32_unicode_filenames)
792
    {
793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810
      wchar_t filename_w[MAX_PATH];

      if (g_b_init_set_file_security_w == 0)
	{
	  g_b_init_set_file_security_w = 1;
	  hm_advapi32 = LoadLibrary ("Advapi32.dll");
	  s_pfn_Set_File_SecurityW =
	    (SetFileSecurityW_Proc) GetProcAddress (hm_advapi32,
						    "SetFileSecurityW");
	}
      if (s_pfn_Set_File_SecurityW == NULL)
	{
	  errno = ENOTSUP;
	  return FALSE;
	}
      filename_to_utf16 (lpFileName, filename_w);
      return (s_pfn_Set_File_SecurityW (filename_w, SecurityInformation,
					pSecurityDescriptor));
811
    }
812
  else
813
    {
814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831
      char filename_a[MAX_PATH];

      if (g_b_init_set_file_security_a == 0)
	{
	  g_b_init_set_file_security_a = 1;
	  hm_advapi32 = LoadLibrary ("Advapi32.dll");
	  s_pfn_Set_File_SecurityA =
	    (SetFileSecurityA_Proc) GetProcAddress (hm_advapi32,
						    "SetFileSecurityA");
	}
      if (s_pfn_Set_File_SecurityA == NULL)
	{
	  errno = ENOTSUP;
	  return FALSE;
	}
      filename_to_ansi (lpFileName, filename_a);
      return (s_pfn_Set_File_SecurityA (filename_a, SecurityInformation,
					pSecurityDescriptor));
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
static DWORD WINAPI
set_named_security_info (LPCTSTR lpObjectName,
			 SE_OBJECT_TYPE ObjectType,
			 SECURITY_INFORMATION SecurityInformation,
			 PSID psidOwner,
			 PSID psidGroup,
			 PACL pDacl,
			 PACL pSacl)
{
  static SetNamedSecurityInfoW_Proc s_pfn_Set_Named_Security_InfoW = NULL;
  static SetNamedSecurityInfoA_Proc s_pfn_Set_Named_Security_InfoA = NULL;
  HMODULE hm_advapi32 = NULL;
  if (is_windows_9x () == TRUE)
    {
      errno = ENOTSUP;
      return ENOTSUP;
    }
  if (w32_unicode_filenames)
    {
      wchar_t filename_w[MAX_PATH];

      if (g_b_init_set_named_security_info_w == 0)
	{
	  g_b_init_set_named_security_info_w = 1;
	  hm_advapi32 = LoadLibrary ("Advapi32.dll");
	  s_pfn_Set_Named_Security_InfoW =
	    (SetNamedSecurityInfoW_Proc) GetProcAddress (hm_advapi32,
							 "SetNamedSecurityInfoW");
	}
      if (s_pfn_Set_Named_Security_InfoW == NULL)
	{
	  errno = ENOTSUP;
	  return ENOTSUP;
	}
      filename_to_utf16 (lpObjectName, filename_w);
      return (s_pfn_Set_Named_Security_InfoW (filename_w, ObjectType,
					      SecurityInformation, psidOwner,
					      psidGroup, pDacl, pSacl));
    }
  else
    {
      char filename_a[MAX_PATH];

      if (g_b_init_set_named_security_info_a == 0)
	{
	  g_b_init_set_named_security_info_a = 1;
	  hm_advapi32 = LoadLibrary ("Advapi32.dll");
	  s_pfn_Set_Named_Security_InfoA =
	    (SetNamedSecurityInfoA_Proc) GetProcAddress (hm_advapi32, 
							 "SetNamedSecurityInfoA");
	}
      if (s_pfn_Set_Named_Security_InfoA == NULL)
	{
	  errno = ENOTSUP;
	  return ENOTSUP;
	}
      filename_to_ansi (lpObjectName, filename_a);
      return (s_pfn_Set_Named_Security_InfoA (filename_a, ObjectType,
					      SecurityInformation, psidOwner,
					      psidGroup, pDacl, pSacl));
    }
}

898 899 900 901
static BOOL WINAPI
get_security_descriptor_owner (PSECURITY_DESCRIPTOR pSecurityDescriptor,
			       PSID *pOwner,
			       LPBOOL lpbOwnerDefaulted)
902 903 904 905 906
{
  static GetSecurityDescriptorOwner_Proc s_pfn_Get_Security_Descriptor_Owner = NULL;
  HMODULE hm_advapi32 = NULL;
  if (is_windows_9x () == TRUE)
    {
907
      errno = ENOTSUP;
908 909 910 911 912 913 914 915 916 917 918 919
      return FALSE;
    }
  if (g_b_init_get_security_descriptor_owner == 0)
    {
      g_b_init_get_security_descriptor_owner = 1;
      hm_advapi32 = LoadLibrary ("Advapi32.dll");
      s_pfn_Get_Security_Descriptor_Owner =
        (GetSecurityDescriptorOwner_Proc) GetProcAddress (
            hm_advapi32, "GetSecurityDescriptorOwner");
    }
  if (s_pfn_Get_Security_Descriptor_Owner == NULL)
    {
920
      errno = ENOTSUP;
921 922 923 924 925 926
      return FALSE;
    }
  return (s_pfn_Get_Security_Descriptor_Owner (pSecurityDescriptor, pOwner,
					       lpbOwnerDefaulted));
}

927 928 929 930
static BOOL WINAPI
get_security_descriptor_group (PSECURITY_DESCRIPTOR pSecurityDescriptor,
			       PSID *pGroup,
			       LPBOOL lpbGroupDefaulted)
931 932 933 934 935
{
  static GetSecurityDescriptorGroup_Proc s_pfn_Get_Security_Descriptor_Group = NULL;
  HMODULE hm_advapi32 = NULL;
  if (is_windows_9x () == TRUE)
    {
936
      errno = ENOTSUP;
937 938 939 940 941 942 943 944 945 946 947 948
      return FALSE;
    }
  if (g_b_init_get_security_descriptor_group == 0)
    {
      g_b_init_get_security_descriptor_group = 1;
      hm_advapi32 = LoadLibrary ("Advapi32.dll");
      s_pfn_Get_Security_Descriptor_Group =
        (GetSecurityDescriptorGroup_Proc) GetProcAddress (
            hm_advapi32, "GetSecurityDescriptorGroup");
    }
  if (s_pfn_Get_Security_Descriptor_Group == NULL)
    {
949
      errno = ENOTSUP;
950 951 952 953 954 955
      return FALSE;
    }
  return (s_pfn_Get_Security_Descriptor_Group (pSecurityDescriptor, pGroup,
					       lpbGroupDefaulted));
}

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
static BOOL WINAPI
get_security_descriptor_dacl (PSECURITY_DESCRIPTOR pSecurityDescriptor,
			      LPBOOL lpbDaclPresent,
			      PACL *pDacl,
			      LPBOOL lpbDaclDefaulted)
{
  static GetSecurityDescriptorDacl_Proc s_pfn_Get_Security_Descriptor_Dacl = NULL;
  HMODULE hm_advapi32 = NULL;
  if (is_windows_9x () == TRUE)
    {
      errno = ENOTSUP;
      return FALSE;
    }
  if (g_b_init_get_security_descriptor_dacl == 0)
    {
      g_b_init_get_security_descriptor_dacl = 1;
      hm_advapi32 = LoadLibrary ("Advapi32.dll");
      s_pfn_Get_Security_Descriptor_Dacl =
        (GetSecurityDescriptorDacl_Proc) GetProcAddress (
            hm_advapi32, "GetSecurityDescriptorDacl");
    }
  if (s_pfn_Get_Security_Descriptor_Dacl == NULL)
    {
      errno = ENOTSUP;
      return FALSE;
    }
  return (s_pfn_Get_Security_Descriptor_Dacl (pSecurityDescriptor,
					      lpbDaclPresent, pDacl,
					      lpbDaclDefaulted));
}

987 988
static BOOL WINAPI
is_valid_sid (PSID sid)
989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010
{
  static IsValidSid_Proc s_pfn_Is_Valid_Sid = NULL;
  HMODULE hm_advapi32 = NULL;
  if (is_windows_9x () == TRUE)
    {
      return FALSE;
    }
  if (g_b_init_is_valid_sid == 0)
    {
      g_b_init_is_valid_sid = 1;
      hm_advapi32 = LoadLibrary ("Advapi32.dll");
      s_pfn_Is_Valid_Sid =
        (IsValidSid_Proc) GetProcAddress (
            hm_advapi32, "IsValidSid");
    }
  if (s_pfn_Is_Valid_Sid == NULL)
    {
      return FALSE;
    }
  return (s_pfn_Is_Valid_Sid (sid));
}

1011 1012
static BOOL WINAPI
equal_sid (PSID sid1, PSID sid2)
1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034
{
  static EqualSid_Proc s_pfn_Equal_Sid = NULL;
  HMODULE hm_advapi32 = NULL;
  if (is_windows_9x () == TRUE)
    {
      return FALSE;
    }
  if (g_b_init_equal_sid == 0)
    {
      g_b_init_equal_sid = 1;
      hm_advapi32 = LoadLibrary ("Advapi32.dll");
      s_pfn_Equal_Sid =
        (EqualSid_Proc) GetProcAddress (
            hm_advapi32, "EqualSid");
    }
  if (s_pfn_Equal_Sid == NULL)
    {
      return FALSE;
    }
  return (s_pfn_Equal_Sid (sid1, sid2));
}

1035 1036
static DWORD WINAPI
get_length_sid (PSID sid)
1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058
{
  static GetLengthSid_Proc s_pfn_Get_Length_Sid = NULL;
  HMODULE hm_advapi32 = NULL;
  if (is_windows_9x () == TRUE)
    {
      return 0;
    }
  if (g_b_init_get_length_sid == 0)
    {
      g_b_init_get_length_sid = 1;
      hm_advapi32 = LoadLibrary ("Advapi32.dll");
      s_pfn_Get_Length_Sid =
        (GetLengthSid_Proc) GetProcAddress (
            hm_advapi32, "GetLengthSid");
    }
  if (s_pfn_Get_Length_Sid == NULL)
    {
      return 0;
    }
  return (s_pfn_Get_Length_Sid (sid));
}

1059 1060
static BOOL WINAPI
copy_sid (DWORD destlen, PSID dest, PSID src)
1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082
{
  static CopySid_Proc s_pfn_Copy_Sid = NULL;
  HMODULE hm_advapi32 = NULL;
  if (is_windows_9x () == TRUE)
    {
      return FALSE;
    }
  if (g_b_init_copy_sid == 0)
    {
      g_b_init_copy_sid = 1;
      hm_advapi32 = LoadLibrary ("Advapi32.dll");
      s_pfn_Copy_Sid =
        (CopySid_Proc) GetProcAddress (
            hm_advapi32, "CopySid");
    }
  if (s_pfn_Copy_Sid == NULL)
    {
      return FALSE;
    }
  return (s_pfn_Copy_Sid (destlen, dest, src));
}

1083 1084 1085 1086 1087 1088
/*
  END: Wrapper functions around OpenProcessToken
  and other functions in advapi32.dll that are only
  supported in Windows NT / 2k / XP
*/

1089 1090
static void WINAPI
get_native_system_info (LPSYSTEM_INFO lpSystemInfo)
1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108
{
  static GetNativeSystemInfo_Proc s_pfn_Get_Native_System_Info = NULL;
  if (is_windows_9x () != TRUE)
    {
      if (g_b_init_get_native_system_info == 0)
	{
	  g_b_init_get_native_system_info = 1;
	  s_pfn_Get_Native_System_Info =
	    (GetNativeSystemInfo_Proc)GetProcAddress (GetModuleHandle ("kernel32.dll"),
						      "GetNativeSystemInfo");
	}
      if (s_pfn_Get_Native_System_Info != NULL)
	s_pfn_Get_Native_System_Info (lpSystemInfo);
    }
  else
    lpSystemInfo->dwNumberOfProcessors = -1;
}

1109 1110 1111 1112
static BOOL WINAPI
get_system_times (LPFILETIME lpIdleTime,
		  LPFILETIME lpKernelTime,
		  LPFILETIME lpUserTime)
1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129
{
  static GetSystemTimes_Proc s_pfn_Get_System_times = NULL;
  if (is_windows_9x () == TRUE)
    {
      return FALSE;
    }
  if (g_b_init_get_system_times == 0)
    {
      g_b_init_get_system_times = 1;
      s_pfn_Get_System_times =
	(GetSystemTimes_Proc)GetProcAddress (GetModuleHandle ("kernel32.dll"),
					     "GetSystemTimes");
    }
  if (s_pfn_Get_System_times == NULL)
    return FALSE;
  return (s_pfn_Get_System_times (lpIdleTime, lpKernelTime, lpUserTime));
}
1130 1131

static BOOLEAN WINAPI
1132 1133
create_symbolic_link (LPCSTR lpSymlinkFilename,
		      LPCSTR lpTargetFileName,
1134 1135
		      DWORD dwFlags)
{
1136 1137
  static CreateSymbolicLinkW_Proc s_pfn_Create_Symbolic_LinkW = NULL;
  static CreateSymbolicLinkA_Proc s_pfn_Create_Symbolic_LinkA = NULL;
1138 1139 1140 1141 1142 1143 1144
  BOOLEAN retval;

  if (is_windows_9x () == TRUE)
    {
      errno = ENOSYS;
      return 0;
    }
1145
  if (w32_unicode_filenames)
1146
    {
1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178
      wchar_t symfn_w[MAX_PATH], tgtfn_w[MAX_PATH];

      if (g_b_init_create_symbolic_link_w == 0)
	{
	  g_b_init_create_symbolic_link_w = 1;
	  s_pfn_Create_Symbolic_LinkW =
	    (CreateSymbolicLinkW_Proc)GetProcAddress (GetModuleHandle ("kernel32.dll"),
						     "CreateSymbolicLinkW");
	}
      if (s_pfn_Create_Symbolic_LinkW == NULL)
	{
	  errno = ENOSYS;
	  return 0;
	}

      filename_to_utf16 (lpSymlinkFilename, symfn_w);
      filename_to_utf16 (lpTargetFileName, tgtfn_w);
      retval = s_pfn_Create_Symbolic_LinkW (symfn_w, tgtfn_w, dwFlags);
      /* If we were denied creation of the symlink, try again after
	 enabling the SeCreateSymbolicLinkPrivilege for our process.  */
      if (!retval)
	{
	  TOKEN_PRIVILEGES priv_current;

	  if (enable_privilege (SE_CREATE_SYMBOLIC_LINK_NAME, TRUE,
				&priv_current))
	    {
	      retval = s_pfn_Create_Symbolic_LinkW (symfn_w, tgtfn_w, dwFlags);
	      restore_privilege (&priv_current);
	      revert_to_self ();
	    }
	}
1179
    }
1180
  else
1181
    {
1182
      char symfn_a[MAX_PATH], tgtfn_a[MAX_PATH];
1183

1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195
      if (g_b_init_create_symbolic_link_a == 0)
	{
	  g_b_init_create_symbolic_link_a = 1;
	  s_pfn_Create_Symbolic_LinkA =
	    (CreateSymbolicLinkA_Proc)GetProcAddress (GetModuleHandle ("kernel32.dll"),
						     "CreateSymbolicLinkA");
	}
      if (s_pfn_Create_Symbolic_LinkA == NULL)
	{
	  errno = ENOSYS;
	  return 0;
	}
1196

1197 1198 1199 1200 1201 1202
      filename_to_ansi (lpSymlinkFilename, symfn_a);
      filename_to_ansi (lpTargetFileName, tgtfn_a);
      retval = s_pfn_Create_Symbolic_LinkA (symfn_a, tgtfn_a, dwFlags);
      /* If we were denied creation of the symlink, try again after
	 enabling the SeCreateSymbolicLinkPrivilege for our process.  */
      if (!retval)
1203
	{
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	  TOKEN_PRIVILEGES priv_current;

	  if (enable_privilege (SE_CREATE_SYMBOLIC_LINK_NAME, TRUE,
				&priv_current))
	    {
	      retval = s_pfn_Create_Symbolic_LinkA (symfn_a, tgtfn_a, dwFlags);
	      restore_privilege (&priv_current);
	      revert_to_self ();
	    }
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	}
    }
  return retval;
}
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static BOOL WINAPI
is_valid_security_descriptor (PSECURITY_DESCRIPTOR pSecurityDescriptor)
{
  static IsValidSecurityDescriptor_Proc s_pfn_Is_Valid_Security_Descriptor_Proc = NULL;

  if (is_windows_9x () == TRUE)
    {
      errno = ENOTSUP;
      return FALSE;
    }

  if (g_b_init_is_valid_security_descriptor == 0)
    {
      g_b_init_is_valid_security_descriptor = 1;
      s_pfn_Is_Valid_Security_Descriptor_Proc =
	(IsValidSecurityDescriptor_Proc)GetProcAddress (GetModuleHandle ("Advapi32.dll"),
							"IsValidSecurityDescriptor");
    }
  if (s_pfn_Is_Valid_Security_Descriptor_Proc == NULL)
    {
      errno = ENOTSUP;
      return FALSE;
    }

  return s_pfn_Is_Valid_Security_Descriptor_Proc (pSecurityDescriptor);
}

static BOOL WINAPI
convert_sd_to_sddl (PSECURITY_DESCRIPTOR SecurityDescriptor,
		    DWORD RequestedStringSDRevision,
		    SECURITY_INFORMATION SecurityInformation,
		    LPTSTR  *StringSecurityDescriptor,
		    PULONG StringSecurityDescriptorLen)
{
  static ConvertSecurityDescriptorToStringSecurityDescriptor_Proc s_pfn_Convert_SD_To_SDDL = NULL;
  BOOL retval;

  if (is_windows_9x () == TRUE)
    {
      errno = ENOTSUP;
      return FALSE;
    }

  if (g_b_init_convert_sd_to_sddl == 0)
    {
      g_b_init_convert_sd_to_sddl = 1;
#ifdef _UNICODE
      s_pfn_Convert_SD_To_SDDL =
	(ConvertSecurityDescriptorToStringSecurityDescriptor_Proc)GetProcAddress (GetModuleHandle ("Advapi32.dll"),
										  "ConvertSecurityDescriptorToStringSecurityDescriptorW");
#else
      s_pfn_Convert_SD_To_SDDL =
	(ConvertSecurityDescriptorToStringSecurityDescriptor_Proc)GetProcAddress (GetModuleHandle ("Advapi32.dll"),
										  "ConvertSecurityDescriptorToStringSecurityDescriptorA");
#endif
    }
  if (s_pfn_Convert_SD_To_SDDL == NULL)
    {
      errno = ENOTSUP;
      return FALSE;
    }

  retval = s_pfn_Convert_SD_To_SDDL (SecurityDescriptor,
				     RequestedStringSDRevision,
				     SecurityInformation,
				     StringSecurityDescriptor,
				     StringSecurityDescriptorLen);

  return retval;
}

static BOOL WINAPI
convert_sddl_to_sd (LPCTSTR StringSecurityDescriptor,
		    DWORD StringSDRevision,
		    PSECURITY_DESCRIPTOR  *SecurityDescriptor,
		    PULONG  SecurityDescriptorSize)
{
  static ConvertStringSecurityDescriptorToSecurityDescriptor_Proc s_pfn_Convert_SDDL_To_SD = NULL;
  BOOL retval;

  if (is_windows_9x () == TRUE)
    {
      errno = ENOTSUP;
      return FALSE;
    }

  if (g_b_init_convert_sddl_to_sd == 0)
    {
      g_b_init_convert_sddl_to_sd = 1;
#ifdef _UNICODE
      s_pfn_Convert_SDDL_To_SD =
	(ConvertStringSecurityDescriptorToSecurityDescriptor_Proc)GetProcAddress (GetModuleHandle ("Advapi32.dll"),
										  "ConvertStringSecurityDescriptorToSecurityDescriptorW");
#else
      s_pfn_Convert_SDDL_To_SD =
	(ConvertStringSecurityDescriptorToSecurityDescriptor_Proc)GetProcAddress (GetModuleHandle ("Advapi32.dll"),
										  "ConvertStringSecurityDescriptorToSecurityDescriptorA");
#endif
    }
  if (s_pfn_Convert_SDDL_To_SD == NULL)
    {
      errno = ENOTSUP;
      return FALSE;
    }

  retval = s_pfn_Convert_SDDL_To_SD (StringSecurityDescriptor,
				     StringSDRevision,
				     SecurityDescriptor,
				     SecurityDescriptorSize);

  return retval;
}

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static DWORD WINAPI
get_adapters_info (PIP_ADAPTER_INFO pAdapterInfo, PULONG pOutBufLen)
{
  static GetAdaptersInfo_Proc s_pfn_Get_Adapters_Info = NULL;
  HMODULE hm_iphlpapi = NULL;

  if (is_windows_9x () == TRUE)
    return ERROR_NOT_SUPPORTED;

  if (g_b_init_get_adapters_info == 0)
    {
      g_b_init_get_adapters_info = 1;
      hm_iphlpapi = LoadLibrary ("Iphlpapi.dll");
      if (hm_iphlpapi)
	s_pfn_Get_Adapters_Info = (GetAdaptersInfo_Proc)
	  GetProcAddress (hm_iphlpapi, "GetAdaptersInfo");
    }
  if (s_pfn_Get_Adapters_Info == NULL)
    return ERROR_NOT_SUPPORTED;
  return s_pfn_Get_Adapters_Info (pAdapterInfo, pOutBufLen);
}

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Andrew Innes committed
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/* Return 1 if P is a valid pointer to an object of size SIZE.  Return
   0 if P is NOT a valid pointer.  Return -1 if we cannot validate P.

   This is called from alloc.c:valid_pointer_p.  */
int
w32_valid_pointer_p (void *p, int size)
{
  SIZE_T done;
  HANDLE h = OpenProcess (PROCESS_VM_READ, FALSE, GetCurrentProcessId ());

  if (h)
    {
      unsigned char *buf = alloca (size);
      int retval = ReadProcessMemory (h, p, buf, size, &done);

      CloseHandle (h);
      return retval;
    }
  else
    return -1;
}

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/* Here's an overview of how the Windows build supports file names
   that cannot be encoded by the current system codepage.

   From the POV of Lisp and layers of C code above the functions here,
   Emacs on Windows pretends that its file names are encoded in UTF-8;
   see encode_file and decode_file on coding.c.  Any file name that is
   passed as a unibyte string to C functions defined here is assumed
   to be in UTF-8 encoding.  Any file name returned by functions
   defined here must be in UTF-8 encoding, with only a few exceptions
   reserved for a couple of special cases.  (Be sure to use
   MAX_UTF8_PATH for char arrays that store UTF-8 encoded file names,
   as they can be much longer than MAX_PATH!)

   The UTF-8 encoded file names cannot be passed to system APIs, as
   Windows does not support that.  Therefore, they are converted
   either to UTF-16 or to the ANSI codepage, depending on the value of
   w32-unicode-filenames, before calling any system APIs or CRT library
   functions.  The default value of that variable is determined by the
   OS on which Emacs runs: nil on Windows 9X and t otherwise, but the
   user can change that default (although I don't see why would she
   want to).

   The 4 functions defined below, filename_to_utf16, filename_to_ansi,
   filename_from_utf16, and filename_from_ansi, are the workhorses of
   these conversions.  They rely on Windows native APIs
   MultiByteToWideChar and WideCharToMultiByte; we cannot use
   functions from coding.c here, because they allocate memory, which
   is a bad idea on the level of libc, which is what the functions
   here emulate.  (If you worry about performance due to constant
   conversion back and forth from UTF-8 to UTF-16, then don't: first,
   it was measured to take only a few microseconds on a not-so-fast
   machine, and second, that's exactly what the ANSI APIs we used
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   before did anyway, because they are just thin wrappers around the
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   Unicode APIs.)

   The variables file-name-coding-system and default-file-name-coding-system
   still exist, but are actually used only when a file name needs to
   be converted to the ANSI codepage.  This happens all the time when
   w32-unicode-filenames is nil, but can also happen from time to time
   when it is t.  Otherwise, these variables have no effect on file-name
   encoding when w32-unicode-filenames is t; this is similar to
   selection-coding-system.

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   This arrangement works very well, but it has a few gotchas and
   limitations:
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   . Lisp code that encodes or decodes file names manually should
     normally use 'utf-8' as the coding-system on Windows,
     disregarding file-name-coding-system.  This is a somewhat
     unpleasant consequence, but it cannot be avoided.  Fortunately,
     very few Lisp packages need to do that.

     More generally, passing to library functions (e.g., fopen or
     opendir) file names already encoded in the ANSI codepage is
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     explicitly *verboten*, as all those functions, as shadowed and
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     emulated here, assume they will receive UTF-8 encoded file names.

     For the same reasons, no CRT function or Win32 API can be called
     directly in Emacs sources, without either converting the file
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     names from UTF-8 to UTF-16 or ANSI codepage, or going through
     some shadowing function defined here.