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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, 2000-2013 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 <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 <sys/time.h>
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#include <sys/utime.h>
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#include <math.h>
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#include <time.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 mktemp
#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"

#include <pwd.h>
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#include <grp.h>
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#ifdef __GNUC__
#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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#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 !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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#include <winioctl.h>
#include <aclapi.h>

#ifdef _MSC_VER
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/* MSVC doesn'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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#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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/* 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 "w32.h"
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#include "ndir.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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extern int sys_access (const char *, int);
extern void *e_malloc (size_t);
extern int sys_select (int, SELECT_TYPE *, SELECT_TYPE *, SELECT_TYPE *,
		       EMACS_TIME *, void *);


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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;
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;
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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";
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const char * const GetFileSecurity_Name =  "GetFileSecurityW";
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#else
const char * const LookupAccountSid_Name = "LookupAccountSidA";
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const char * const GetFileSecurity_Name =  "GetFileSecurityA";
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#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 * GetFileSecurity_Proc) (
    LPCTSTR lpFileName,
    SECURITY_INFORMATION RequestedInformation,
    PSECURITY_DESCRIPTOR pSecurityDescriptor,
    DWORD nLength,
    LPDWORD lpnLengthNeeded);
typedef BOOL (WINAPI * GetSecurityDescriptorOwner_Proc) (
    PSECURITY_DESCRIPTOR pSecurityDescriptor,
    PSID *pOwner,
    LPBOOL lpbOwnerDefaulted);
typedef BOOL (WINAPI * GetSecurityDescriptorGroup_Proc) (
    PSECURITY_DESCRIPTOR pSecurityDescriptor,
    PSID *pGroup,
    LPBOOL lpbGroupDefaulted);
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 *CreateSymbolicLink_Proc) (
    LPTSTR lpSymlinkFileName,
    LPTSTR lpTargetFileName,
    DWORD  dwFlags);
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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)
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{
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  static LookupAccountSid_Proc s_pfn_Lookup_Account_Sid = NULL;
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  HMODULE hm_advapi32 = NULL;
  if (is_windows_9x () == TRUE)
    {
      return FALSE;
    }
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  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)
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    {
      return FALSE;
    }
  return (
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      s_pfn_Lookup_Account_Sid (
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          lpSystemName,
          Sid,
          Name,
          cbName,
          DomainName,
          cbDomainName,
          peUse)
      );
}

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static PDWORD WINAPI
get_sid_sub_authority (PSID pSid, DWORD n)
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{
  static GetSidSubAuthority_Proc s_pfn_Get_Sid_Sub_Authority = NULL;
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  static DWORD zero = 0U;
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  HMODULE hm_advapi32 = NULL;
  if (is_windows_9x () == TRUE)
    {
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      return &zero;
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    }
  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)
    {
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      return &zero;
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    }
  return (s_pfn_Get_Sid_Sub_Authority (pSid, n));
}

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static PUCHAR WINAPI
get_sid_sub_authority_count (PSID pSid)
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{
  static GetSidSubAuthorityCount_Proc s_pfn_Get_Sid_Sub_Authority_Count = NULL;
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  static UCHAR zero = 0U;
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  HMODULE hm_advapi32 = NULL;
  if (is_windows_9x () == TRUE)
    {
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      return &zero;
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    }
  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)
    {
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      return &zero;
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    }
  return (s_pfn_Get_Sid_Sub_Authority_Count (pSid));
}

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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));
}

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static BOOL WINAPI
get_file_security (LPCTSTR lpFileName,
		   SECURITY_INFORMATION RequestedInformation,
		   PSECURITY_DESCRIPTOR pSecurityDescriptor,
		   DWORD nLength,
		   LPDWORD lpnLengthNeeded)
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{
  static GetFileSecurity_Proc s_pfn_Get_File_Security = NULL;
  HMODULE hm_advapi32 = NULL;
  if (is_windows_9x () == TRUE)
    {
      return FALSE;
    }
  if (g_b_init_get_file_security == 0)
    {
      g_b_init_get_file_security = 1;
      hm_advapi32 = LoadLibrary ("Advapi32.dll");
      s_pfn_Get_File_Security =
        (GetFileSecurity_Proc) GetProcAddress (
            hm_advapi32, GetFileSecurity_Name);
    }
  if (s_pfn_Get_File_Security == NULL)
    {
      return FALSE;
    }
  return (s_pfn_Get_File_Security (lpFileName, RequestedInformation,
				   pSecurityDescriptor, nLength,
				   lpnLengthNeeded));
}

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static BOOL WINAPI
get_security_descriptor_owner (PSECURITY_DESCRIPTOR pSecurityDescriptor,
			       PSID *pOwner,
			       LPBOOL lpbOwnerDefaulted)
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{
  static GetSecurityDescriptorOwner_Proc s_pfn_Get_Security_Descriptor_Owner = NULL;
  HMODULE hm_advapi32 = NULL;
  if (is_windows_9x () == TRUE)
    {
      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)
    {
      return FALSE;
    }
  return (s_pfn_Get_Security_Descriptor_Owner (pSecurityDescriptor, pOwner,
					       lpbOwnerDefaulted));
}

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static BOOL WINAPI
get_security_descriptor_group (PSECURITY_DESCRIPTOR pSecurityDescriptor,
			       PSID *pGroup,
			       LPBOOL lpbGroupDefaulted)
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{
  static GetSecurityDescriptorGroup_Proc s_pfn_Get_Security_Descriptor_Group = NULL;
  HMODULE hm_advapi32 = NULL;
  if (is_windows_9x () == TRUE)
    {
      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)
    {
      return FALSE;
    }
  return (s_pfn_Get_Security_Descriptor_Group (pSecurityDescriptor, pGroup,
					       lpbGroupDefaulted));
}

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static BOOL WINAPI
is_valid_sid (PSID sid)
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{
  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));
}

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static BOOL WINAPI
equal_sid (PSID sid1, PSID sid2)
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{
  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));
}

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static DWORD WINAPI
get_length_sid (PSID sid)
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{
  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));
}

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static BOOL WINAPI
copy_sid (DWORD destlen, PSID dest, PSID src)
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{
  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));
}

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/*
  END: Wrapper functions around OpenProcessToken
  and other functions in advapi32.dll that are only
  supported in Windows NT / 2k / XP
*/

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static void WINAPI
get_native_system_info (LPSYSTEM_INFO lpSystemInfo)
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{
  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;
}

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static BOOL WINAPI
get_system_times (LPFILETIME lpIdleTime,
		  LPFILETIME lpKernelTime,
		  LPFILETIME lpUserTime)
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{
  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));
}
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static BOOLEAN WINAPI
create_symbolic_link (LPTSTR lpSymlinkFilename,
		      LPTSTR lpTargetFileName,
		      DWORD dwFlags)
{
  static CreateSymbolicLink_Proc s_pfn_Create_Symbolic_Link = NULL;
  BOOLEAN retval;

  if (is_windows_9x () == TRUE)
    {
      errno = ENOSYS;
      return 0;
    }
  if (g_b_init_create_symbolic_link == 0)
    {
      g_b_init_create_symbolic_link = 1;
#ifdef _UNICODE
      s_pfn_Create_Symbolic_Link =
	(CreateSymbolicLink_Proc)GetProcAddress (GetModuleHandle ("kernel32.dll"),
						 "CreateSymbolicLinkW");
#else
      s_pfn_Create_Symbolic_Link =
	(CreateSymbolicLink_Proc)GetProcAddress (GetModuleHandle ("kernel32.dll"),
						 "CreateSymbolicLinkA");
#endif
    }
  if (s_pfn_Create_Symbolic_Link == NULL)
    {
      errno = ENOSYS;
      return 0;
    }

  retval = s_pfn_Create_Symbolic_Link (lpSymlinkFilename, lpTargetFileName,
				       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_Link (lpSymlinkFilename, lpTargetFileName,
					       dwFlags);
	  restore_privilege (&priv_current);
	  revert_to_self ();
	}
    }
  return retval;
}
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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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static char startup_dir[MAXPATHLEN];
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/* Get the current working directory.  */
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char *
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getwd (char *dir)
{
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#if 0
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  if (GetCurrentDirectory (MAXPATHLEN, dir) > 0)
    return dir;
  return NULL;
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#else
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  /* Emacs doesn't actually change directory itself, it stays in the
     same directory where it was started.  */
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  strcpy (dir, startup_dir);
  return dir;
#endif
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}

/* Emulate getloadavg.  */
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struct load_sample {
  time_t sample_time;
  ULONGLONG idle;
  ULONGLONG kernel;
  ULONGLONG user;
};

/* Number of processors on this machine.  */
static unsigned num_of_processors;

/* We maintain 1-sec samples for the last 16 minutes in a circular buffer.  */
static struct load_sample samples[16*60];
static int first_idx = -1, last_idx = -1;
static int max_idx = sizeof (samples) / sizeof (samples[0]);

static int
buf_next (int from)
{
  int next_idx = from + 1;

  if (next_idx >= max_idx)
    next_idx = 0;

  return next_idx;
}

static int
buf_prev (int from)
{
  int prev_idx = from - 1;

  if (prev_idx < 0)
    prev_idx = max_idx - 1;

  return prev_idx;
}

static void
sample_system_load (ULONGLONG *idle, ULONGLONG *kernel, ULONGLONG *user)
{
  SYSTEM_INFO sysinfo;
  FILETIME ft_idle, ft_user, ft_kernel;

  /* Initialize the number of processors on this machine.  */
  if (num_of_processors <= 0)
    {
      get_native_system_info (&sysinfo);
      num_of_processors = sysinfo.dwNumberOfProcessors;
      if (num_of_processors <= 0)
	{
	  GetSystemInfo (&sysinfo);
	  num_of_processors = sysinfo.dwNumberOfProcessors;
	}
      if (num_of_processors <= 0)
	num_of_processors = 1;
    }

  /* TODO: Take into account threads that are ready to run, by
     sampling the "\System\Processor Queue Length" performance
     counter.  The code below accounts only for threads that are
     actually running.  */

  if (get_system_times (&ft_idle, &ft_kernel, &ft_user))
    {
      ULARGE_INTEGER uidle, ukernel, uuser;

      memcpy (&uidle, &ft_idle, sizeof (ft_idle));
      memcpy (&ukernel, &ft_kernel, sizeof (ft_kernel));
      memcpy (&uuser, &ft_user, sizeof (ft_user));
      *idle = uidle.QuadPart;
      *kernel = ukernel.QuadPart;
      *user = uuser.QuadPart;
    }
  else
    {
      *idle = 0;
      *kernel = 0;
      *user = 0;
    }
}

/* Produce the load average for a given time interval, using the
   samples in the samples[] array.  WHICH can be 0, 1, or 2, meaning
   1-minute, 5-minute, or 15-minute average, respectively. */
static double
getavg (int which)
{
  double retval = -1.0;
  double tdiff;
  int idx;
  double span = (which == 0 ? 1.0 : (which == 1 ? 5.0 : 15.0)) * 60;
  time_t now = samples[last_idx].sample_time;

  if (first_idx != last_idx)
    {
      for (idx = buf_prev (last_idx); ; idx = buf_prev (idx))
	{
	  tdiff = difftime (now, samples[idx].sample_time);
	  if (tdiff >= span - 2*DBL_EPSILON*now)
	    {
	      long double sys =
		samples[last_idx].kernel + samples[last_idx].user
		- (samples[idx].kernel + samples[idx].user);
	      long double idl = samples[last_idx].idle - samples[idx].idle;

	      retval = (1.0 - idl / sys) * num_of_processors;
	      break;
	    }
	  if (idx == first_idx)
	    break;
	}
    }

  return retval;
}

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int
getloadavg (double loadavg[], int nelem)
{
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  int elem;
  ULONGLONG idle, kernel, user;
  time_t now = time (NULL);

  /* Store another sample.  We ignore samples that are less than 1 sec
     apart.  */
  if (difftime (now, samples[last_idx].sample_time) >= 1.0 - 2*DBL_EPSILON*now)
    {
      sample_system_load (&idle, &kernel, &user);
      last_idx = buf_next (last_idx);
      samples[last_idx].sample_time = now;
      samples[last_idx].idle = idle;
      samples[last_idx].kernel = kernel;
      samples[last_idx].user = user;
      /* If the buffer has more that 15 min worth of samples, discard
	 the old ones.  */
      if (first_idx == -1)
	first_idx = last_idx;
      while (first_idx != last_idx
	     && (difftime (now, samples[first_idx].sample_time)
	         >= 15.0*60 + 2*DBL_EPSILON*now))
	first_idx = buf_next (first_idx);
    }
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  for (elem = 0; elem < nelem; elem++)
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    {
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      double avg = getavg (elem);

      if (avg < 0)
	break;
      loadavg[elem] = avg;
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    }
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  return elem;
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}

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/* Emulate getpwuid, getpwnam and others.  */
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#define PASSWD_FIELD_SIZE 256

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static char dflt_passwd_name[PASSWD_FIELD_SIZE];
static char dflt_passwd_passwd[PASSWD_FIELD_SIZE];
static char dflt_passwd_gecos[PASSWD_FIELD_SIZE];
static char dflt_passwd_dir[PASSWD_FIELD_SIZE];
static char dflt_passwd_shell[PASSWD_FIELD_SIZE];
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static struct passwd dflt_passwd =
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{
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  dflt_passwd_name,
  dflt_passwd_passwd,
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  0,
  0,
  0,
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  dflt_passwd_gecos,
  dflt_passwd_dir,
  dflt_passwd_shell,
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};

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static char dflt_group_name[GNLEN+1];

static struct group dflt_group =
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{
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  /* When group information is not available, we return this as the
     group for all files.  */
  dflt_group_name,
  0,
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};

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unsigned
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getuid (void)
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{
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  return dflt_passwd.pw_uid;
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}

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unsigned
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geteuid (void)
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{
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  /* I could imagine arguing for checking to see whether the user is
     in the Administrators group and returning a UID of 0 for that
     case, but I don't know how wise that would be in the long run.  */
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  return getuid ();
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}

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unsigned
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getgid (void)
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{
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  return dflt_passwd.pw_gid;
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}

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unsigned
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getegid (void)
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{
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  return getgid ();
}

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struct passwd *
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getpwuid (unsigned uid)
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{
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  if (uid == dflt_passwd.pw_uid)
    return &dflt_passwd;
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  return NULL;
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}

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struct group *
getgrgid (gid_t gid)
{
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  return &dflt_group;
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}

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struct passwd *
getpwnam (char *name)
{
  struct passwd *pw;
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  pw = getpwuid (getuid ());
  if (!pw)
    return pw;

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  if (xstrcasecmp (name, pw->pw_name))
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    return NULL;

  return pw;
}

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static void
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init_user_info (void)
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{
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  /* Find the user's real name by opening the process token and
     looking up the name associated with the user-sid in that token.

     Use the relative portion of the identifier authority value from
     the user-sid as the user id value (same for group id using the
     primary group sid from the process token). */

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  char         uname[UNLEN+1], gname[GNLEN+1], domain[1025];
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  DWORD        ulength = sizeof (uname), dlength = sizeof (domain), needed;
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  DWORD	       glength = sizeof (gname);
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  HANDLE       token = NULL;
  SID_NAME_USE user_type;
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  unsigned char *buf = NULL;
  DWORD        blen = 0;
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  TOKEN_USER   user_token;
  TOKEN_PRIMARY_GROUP group_token;
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  BOOL         result;
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  result = open_process_token (GetCurrentProcess (), TOKEN_QUERY, &token);
  if (result)
    {
      result = get_token_information (token, TokenUser, NULL, 0, &blen);
      if (!result && GetLastError () == ERROR_INSUFFICIENT_BUFFER)
	{
	  buf = xmalloc (blen);
	  result = get_token_information (token, TokenUser,
					  (LPVOID)buf, blen, &needed);
	  if (result)
	    {
	      memcpy (&user_token, buf, sizeof (user_token));
	      result = lookup_account_sid (NULL, user_token.User.Sid,
					   uname, &ulength,
					   domain, &dlength, &user_type);
	    }
	}
      else
	result = FALSE;
    }
  if (result)
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    {
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      strcpy (dflt_passwd.pw_name, uname);
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      /* Determine a reasonable uid value.  */
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      if (xstrcasecmp ("administrator", uname) == 0)
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	{
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	  dflt_passwd.pw_uid = 500; /* well-known Administrator uid */
	  dflt_passwd.pw_gid = 513; /* well-known None gid */
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	}
      else
	{
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	  /* Use the last sub-authority value of the RID, the relative
	     portion of the SID, as user/group ID. */
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	  dflt_passwd.pw_uid = get_rid (user_token.User.Sid);
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	  /* Get group id and name.  */
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	  result = get_token_information (token, TokenPrimaryGroup,
					  (LPVOID)buf, blen, &needed);
	  if (!result && GetLastError () == ERROR_INSUFFICIENT_BUFFER)
	    {
	      buf = xrealloc (buf, blen = needed);
	      result = get_token_information (token, TokenPrimaryGroup,
					      (LPVOID)buf, blen, &needed);
	    }
	  if (result)
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	    {
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	      memcpy (&group_token, buf, sizeof (group_token));
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	      dflt_passwd.pw_gid = get_rid (group_token.PrimaryGroup);
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	      dlength = sizeof (domain);
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	      /* If we can get at the real Primary Group name, use that.
		 Otherwise, the default group name was already set to
		 "None" in globals_of_w32.  */
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	      if (lookup_account_sid (NULL, group_token.PrimaryGroup,
				      gname, &glength, NULL, &dlength,
				      &user_type))
		strcpy (dflt_group_name, gname);
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	    }
	  else
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	    dflt_passwd.pw_gid = dflt_passwd.pw_uid;
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	}
    }
  /* If security calls are not supported (presumably because we
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     are running under Windows 9X), fallback to this: */
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  else if (GetUserName (uname, &ulength))
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    {
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      strcpy (dflt_passwd.pw_name, uname);
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      if (xstrcasecmp ("administrator", uname) == 0)
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	dflt_passwd.pw_uid = 0;
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      else
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	dflt_passwd.pw_uid = 123;
      dflt_passwd.pw_gid = dflt_passwd.pw_uid;
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    }
  else
    {
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      strcpy (dflt_passwd.pw_name, "unknown");
      dflt_passwd.pw_uid = 123;
      dflt_passwd.pw_gid = 123;
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    }
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  dflt_group.gr_gid = dflt_passwd.pw_gid;
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  /* Ensure HOME and SHELL are defined. */
  if (getenv ("HOME") == NULL)
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    emacs_abort ();
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  if (getenv ("SHELL") == NULL)
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    emacs_abort ();
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  /* Set dir and shell from environment variables. */
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  strcpy (dflt_passwd.pw_dir, getenv ("HOME"));
  strcpy (dflt_passwd.pw_shell, getenv ("SHELL"));
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  xfree (buf);
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  if (token)
    CloseHandle (token);
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}

int
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random (void)
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{
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  /* rand () on NT gives us 15 random bits...hack together 30 bits.  */
  return ((rand () << 15) | rand ());
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}

void
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srandom (int seed)
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{
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  srand (seed);