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[perl5.git] / win32 / win32.c
index 16bf51e..aacc656 100644 (file)
 #ifndef HWND_MESSAGE
 #  define HWND_MESSAGE     ((HWND)-3)
 #endif
+#ifndef WC_NO_BEST_FIT_CHARS
+#  define WC_NO_BEST_FIT_CHARS 0x00000400
+#endif
 #include <winnt.h>
+#include <tlhelp32.h>
 #include <io.h>
 #include <signal.h>
 
+#define SystemProcessesAndThreadsInformation 5
+
+/* Inline some definitions from the DDK */
+typedef struct {
+    USHORT         Length;
+    USHORT         MaximumLength;
+    PWSTR          Buffer;
+}   UNICODE_STRING;
+
+typedef struct {
+    ULONG           NextEntryDelta;
+    ULONG          ThreadCount;
+    ULONG          Reserved1[6];
+    LARGE_INTEGER   CreateTime;
+    LARGE_INTEGER   UserTime;
+    LARGE_INTEGER   KernelTime;
+    UNICODE_STRING  ProcessName;
+    LONG           BasePriority;
+    ULONG          ProcessId;
+    ULONG          InheritedFromProcessId;
+    /* Remainder of the structure depends on the Windows version,
+     * but we don't need those additional fields anyways... */
+}   SYSTEM_PROCESSES;
+
 /* #include "config.h" */
 
 #if !defined(PERLIO_IS_STDIO) && !defined(USE_SFIO)
@@ -121,6 +149,11 @@ END_EXTERN_C
 
 static OSVERSIONINFO g_osver = {0, 0, 0, 0, 0, ""};
 
+static HANDLE (WINAPI *pfnCreateToolhelp32Snapshot)(DWORD, DWORD) = NULL;
+static BOOL   (WINAPI *pfnProcess32First)(HANDLE, PROCESSENTRY32*) = NULL;
+static BOOL   (WINAPI *pfnProcess32Next)(HANDLE, PROCESSENTRY32*) = NULL;
+static LONG   (WINAPI *pfnZwQuerySystemInformation)(UINT, PVOID, ULONG, PULONG);
+
 #ifdef __BORLANDC__
 /* Silence STDERR grumblings from Borland's math library. */
 DllExport int
@@ -161,21 +194,48 @@ IsWinNT(void)
 EXTERN_C void
 set_w32_module_name(void)
 {
+    /* this function may be called at DLL_PROCESS_ATTACH time */
     char* ptr;
-    GetModuleFileName((HMODULE)((w32_perldll_handle == INVALID_HANDLE_VALUE)
-                               ? GetModuleHandle(NULL)
-                               : w32_perldll_handle),
-                     w32_module_name, sizeof(w32_module_name));
+    HMODULE module = (HMODULE)((w32_perldll_handle == INVALID_HANDLE_VALUE)
+                               ? GetModuleHandle(NULL)
+                               : w32_perldll_handle);
+
+    OSVERSIONINFO osver; /* g_osver may not yet be initialized */
+    osver.dwOSVersionInfoSize = sizeof(osver);
+    GetVersionEx(&osver);
+
+    if (osver.dwPlatformId == VER_PLATFORM_WIN32_NT) {
+        WCHAR modulename[MAX_PATH];
+        WCHAR fullname[MAX_PATH];
+        char *ansi;
+
+        GetModuleFileNameW(module, modulename, sizeof(modulename)/sizeof(WCHAR));
+
+        /* Make sure we get an absolute pathname in case the module was loaded
+         * explicitly by LoadLibrary() with a relative path. */
+        GetFullPathNameW(modulename, sizeof(fullname)/sizeof(WCHAR), fullname, NULL);
+
+        /* remove \\?\ prefix */
+        if (memcmp(fullname, L"\\\\?\\", 4*sizeof(WCHAR)) == 0)
+            memmove(fullname, fullname+4, (wcslen(fullname+4)+1)*sizeof(WCHAR));
+
+        ansi = win32_ansipath(fullname);
+        my_strlcpy(w32_module_name, ansi, sizeof(w32_module_name));
+        win32_free(ansi);
+    }
+    else {
+        GetModuleFileName(module, w32_module_name, sizeof(w32_module_name));
 
-    /* remove \\?\ prefix */
-    if (memcmp(w32_module_name, "\\\\?\\", 4) == 0)
-        memmove(w32_module_name, w32_module_name+4, strlen(w32_module_name+4)+1);
+        /* remove \\?\ prefix */
+        if (memcmp(w32_module_name, "\\\\?\\", 4) == 0)
+            memmove(w32_module_name, w32_module_name+4, strlen(w32_module_name+4)+1);
 
-    /* try to get full path to binary (which may be mangled when perl is
-     * run from a 16-bit app) */
-    /*PerlIO_printf(Perl_debug_log, "Before %s\n", w32_module_name);*/
-    (void)win32_longpath(w32_module_name);
-    /*PerlIO_printf(Perl_debug_log, "After  %s\n", w32_module_name);*/
+        /* try to get full path to binary (which may be mangled when perl is
+         * run from a 16-bit app) */
+        /*PerlIO_printf(Perl_debug_log, "Before %s\n", w32_module_name);*/
+        win32_longpath(w32_module_name);
+        /*PerlIO_printf(Perl_debug_log, "After  %s\n", w32_module_name);*/
+    }
 
     /* normalize to forward slashes */
     ptr = w32_module_name;
@@ -752,6 +812,10 @@ win32_opendir(const char *filename)
     char               scanname[MAX_PATH+3];
     Stat_t             sbuf;
     WIN32_FIND_DATAA   aFindData;
+    WIN32_FIND_DATAW   wFindData;
+    bool                using_wide;
+    char               buffer[MAX_PATH*2];
+    char               *ptr;
 
     len = strlen(filename);
     if (len > MAX_PATH)
@@ -779,7 +843,15 @@ win32_opendir(const char *filename)
     scanname[len] = '\0';
 
     /* do the FindFirstFile call */
-    dirp->handle = FindFirstFileA(PerlDir_mapA(scanname), &aFindData);
+    if (IsWinNT()) {
+        WCHAR wscanname[sizeof(scanname)];
+        MultiByteToWideChar(CP_ACP, 0, scanname, -1, wscanname, sizeof(wscanname)/sizeof(WCHAR));
+       dirp->handle = FindFirstFileW(PerlDir_mapW(wscanname), &wFindData);
+        using_wide = TRUE;
+    }
+    else {
+       dirp->handle = FindFirstFileA(PerlDir_mapA(scanname), &aFindData);
+    }
     if (dirp->handle == INVALID_HANDLE_VALUE) {
        DWORD err = GetLastError();
        /* FindFirstFile() fails on empty drives! */
@@ -801,16 +873,31 @@ win32_opendir(const char *filename)
        return NULL;
     }
 
+    if (using_wide) {
+        BOOL use_default = FALSE;
+        WideCharToMultiByte(CP_ACP, WC_NO_BEST_FIT_CHARS,
+                            wFindData.cFileName, -1,
+                            buffer, sizeof(buffer), NULL, &use_default);
+        if (use_default && *wFindData.cAlternateFileName) {
+            WideCharToMultiByte(CP_ACP, WC_NO_BEST_FIT_CHARS,
+                                wFindData.cAlternateFileName, -1,
+                                buffer, sizeof(buffer), NULL, NULL);
+        }
+        ptr = buffer;
+    }
+    else {
+        ptr = aFindData.cFileName;
+    }
     /* now allocate the first part of the string table for
      * the filenames that we find.
      */
-    idx = strlen(aFindData.cFileName)+1;
+    idx = strlen(ptr)+1;
     if (idx < 256)
-       dirp->size = 128;
+       dirp->size = 256;
     else
        dirp->size = idx;
     Newx(dirp->start, dirp->size, char);
-    strcpy(dirp->start, aFindData.cFileName);
+    strcpy(dirp->start, ptr);
     dirp->nfiles++;
     dirp->end = dirp->curr = dirp->start;
     dirp->end += idx;
@@ -839,16 +926,37 @@ win32_readdir(DIR *dirp)
        dirp->curr += len + 1;
        if (dirp->curr >= dirp->end) {
            dTHX;
-           BOOL                res;
-           WIN32_FIND_DATAA    aFindData;
+           BOOL res;
+            WIN32_FIND_DATAA aFindData;
+           char buffer[MAX_PATH*2];
+            char *ptr;
 
            /* finding the next file that matches the wildcard
             * (which should be all of them in this directory!).
             */
-            res = FindNextFileA(dirp->handle, &aFindData);
+           if (IsWinNT()) {
+                WIN32_FIND_DATAW wFindData;
+               res = FindNextFileW(dirp->handle, &wFindData);
+               if (res) {
+                    BOOL use_default = FALSE;
+                    WideCharToMultiByte(CP_ACP, WC_NO_BEST_FIT_CHARS,
+                                        wFindData.cFileName, -1,
+                                        buffer, sizeof(buffer), NULL, &use_default);
+                    if (use_default && *wFindData.cAlternateFileName) {
+                        WideCharToMultiByte(CP_ACP, WC_NO_BEST_FIT_CHARS,
+                                            wFindData.cAlternateFileName, -1,
+                                            buffer, sizeof(buffer), NULL, NULL);
+                    }
+                    ptr = buffer;
+                }
+            }
+            else {
+                res = FindNextFileA(dirp->handle, &aFindData);
+                ptr = aFindData.cFileName;
+            }
            if (res) {
                long endpos = dirp->end - dirp->start;
-               long newsize = endpos + strlen(aFindData.cFileName) + 1;
+               long newsize = endpos + strlen(ptr) + 1;
                /* bump the string table size by enough for the
                 * new name and its null terminator */
                while (newsize > dirp->size) {
@@ -857,7 +965,7 @@ win32_readdir(DIR *dirp)
                    Renew(dirp->start, dirp->size, char);
                    dirp->curr = dirp->start + curpos;
                }
-               strcpy(dirp->start + endpos, aFindData.cFileName);
+               strcpy(dirp->start + endpos, ptr);
                dirp->end = dirp->start + newsize;
                dirp->nfiles++;
            }
@@ -1056,20 +1164,154 @@ remove_dead_pseudo_process(long child)
 }
 #endif
 
+static int
+terminate_process(DWORD pid, HANDLE process_handle, int sig)
+{
+    switch(sig) {
+    case 0:
+        /* "Does process exist?" use of kill */
+        return 1;
+    case 2:
+        if (GenerateConsoleCtrlEvent(CTRL_C_EVENT, pid))
+            return 1;
+        break;
+    case SIGBREAK:
+    case SIGTERM:
+        if (GenerateConsoleCtrlEvent(CTRL_BREAK_EVENT, pid))
+            return 1;
+        break;
+    default: /* For now be backwards compatible with perl 5.6 */
+    case 9:
+        /* Note that we will only be able to kill processes owned by the
+         * current process owner, even when we are running as an administrator.
+         * To kill processes of other owners we would need to set the
+         * 'SeDebugPrivilege' privilege before obtaining the process handle.
+         */
+        if (TerminateProcess(process_handle, sig))
+            return 1;
+        break;
+    }
+    return 0;
+}
+
+/* Traverse process tree using ToolHelp functions */
+static int
+kill_process_tree_toolhelp(DWORD pid, int sig)
+{
+    HANDLE process_handle;
+    HANDLE snapshot_handle;
+    int killed = 0;
+
+    process_handle = OpenProcess(PROCESS_TERMINATE, FALSE, pid);
+    if (process_handle == INVALID_HANDLE_VALUE)
+        return 0;
+
+    killed += terminate_process(pid, process_handle, sig);
+
+    snapshot_handle = pfnCreateToolhelp32Snapshot(TH32CS_SNAPPROCESS, 0);
+    if (snapshot_handle != INVALID_HANDLE_VALUE) {
+        PROCESSENTRY32 entry;
+
+        entry.dwSize = sizeof(entry);
+        if (pfnProcess32First(snapshot_handle, &entry)) {
+            do {
+                if (entry.th32ParentProcessID == pid)
+                    killed += kill_process_tree_toolhelp(entry.th32ProcessID, sig);
+                entry.dwSize = sizeof(entry);
+            }
+            while (pfnProcess32Next(snapshot_handle, &entry));
+        }
+        CloseHandle(snapshot_handle);
+    }
+    CloseHandle(process_handle);
+    return killed;
+}
+
+/* Traverse process tree using undocumented system information structures.
+ * This is only necessary on Windows NT, which lacks the ToolHelp functions.
+ */
+static int
+kill_process_tree_sysinfo(SYSTEM_PROCESSES *process_info, DWORD pid, int sig)
+{
+    HANDLE process_handle;
+    SYSTEM_PROCESSES *p = process_info;
+    int killed = 0;
+
+    process_handle = OpenProcess(PROCESS_TERMINATE, FALSE, pid);
+    if (process_handle == INVALID_HANDLE_VALUE)
+        return 0;
+
+    killed += terminate_process(pid, process_handle, sig);
+
+    while (1) {
+        if (p->InheritedFromProcessId == (DWORD)pid)
+            killed += kill_process_tree_sysinfo(process_info, p->ProcessId, sig);
+
+        if (p->NextEntryDelta == 0)
+            break;
+
+        p = (SYSTEM_PROCESSES*)((char*)p + p->NextEntryDelta);
+    }
+
+    CloseHandle(process_handle);
+    return killed;
+}
+
+int
+killpg(int pid, int sig)
+{
+    /* Use "documented" method whenever available */
+    if (pfnCreateToolhelp32Snapshot && pfnProcess32First && pfnProcess32Next) {
+        return kill_process_tree_toolhelp((DWORD)pid, sig);
+    }
+
+    /* Fall back to undocumented Windows internals on Windows NT */
+    if (pfnZwQuerySystemInformation) {
+        dTHX;
+        char *buffer;
+        DWORD size = 0;
+
+        pfnZwQuerySystemInformation(SystemProcessesAndThreadsInformation, NULL, 0, &size);
+        Newx(buffer, size, char);
+
+        if (pfnZwQuerySystemInformation(SystemProcessesAndThreadsInformation, buffer, size, NULL) >= 0) {
+            int killed = kill_process_tree_sysinfo((SYSTEM_PROCESSES*)buffer, (DWORD)pid, sig);
+            Safefree(buffer);
+            return killed;
+        }
+    }
+    return 0;
+}
+
+static int
+my_kill(int pid, int sig)
+{
+    int retval = 0;
+    HANDLE process_handle;
+
+    if (sig < 0)
+        return killpg(pid, -sig);
+
+    process_handle = OpenProcess(PROCESS_TERMINATE, FALSE, pid);
+    if (process_handle != INVALID_HANDLE_VALUE) {
+        retval = terminate_process(pid, process_handle, sig);
+        CloseHandle(process_handle);
+    }
+    return retval;
+}
+
 DllExport int
 win32_kill(int pid, int sig)
 {
     dTHX;
-    HANDLE hProcess;
     long child;
-    int retval;
 #ifdef USE_ITHREADS
     if (pid < 0) {
        /* it is a pseudo-forked child */
        child = find_pseudo_pid(-pid);
        if (child >= 0) {
             HWND hwnd = w32_pseudo_child_message_hwnds[child];
-           hProcess = w32_pseudo_child_handles[child];
+           HANDLE hProcess = w32_pseudo_child_handles[child];
            switch (sig) {
            case 0:
                /* "Does process exist?" use of kill */
@@ -1117,58 +1359,19 @@ win32_kill(int pid, int sig)
     {
        child = find_pid(pid);
        if (child >= 0) {
-            hProcess = w32_child_handles[child];
-           switch(sig) {
-           case 0:
-               /* "Does process exist?" use of kill */
-               return 0;
-           case 2:
-               if (GenerateConsoleCtrlEvent(CTRL_C_EVENT,pid))
-                   return 0;
-               break;
-            case SIGBREAK:
-            case SIGTERM:
-                if (GenerateConsoleCtrlEvent(CTRL_BREAK_EVENT,pid))
-                    return 0;
-                break;
-           default: /* For now be backwards compatible with perl5.6 */
-           case 9:
-               if (TerminateProcess(hProcess, sig)) {
-                   remove_dead_process(child);
-                   return 0;
-               }
-               break;
+            if (my_kill(pid, sig)) {
+                DWORD exitcode = 0;
+                if (GetExitCodeProcess(w32_child_handles[child], &exitcode) &&
+                    exitcode != STILL_ACTIVE)
+                {
+                    remove_dead_process(child);
+                }
+                return 0;
             }
        }
        else {
 alien_process:
-            retval = -1;
-           hProcess = OpenProcess(PROCESS_ALL_ACCESS, TRUE,
-                                  (IsWin95() ? -pid : pid));
-           if (hProcess) {
-               switch(sig) {
-               case 0:
-                   /* "Does process exist?" use of kill */
-                   retval = 0;
-                    break;
-               case 2:
-                   if (GenerateConsoleCtrlEvent(CTRL_C_EVENT,pid))
-                       retval = 0;
-                   break;
-                case SIGBREAK:
-                case SIGTERM:
-                    if (GenerateConsoleCtrlEvent(CTRL_BREAK_EVENT,pid))
-                       retval = 0;
-                    break;
-               default: /* For now be backwards compatible with perl5.6 */
-                case 9:
-                   if (TerminateProcess(hProcess, sig))
-                       retval = 0;
-                    break;
-               }
-           }
-            CloseHandle(hProcess);
-            if (retval == 0)
+            if (my_kill((IsWin95() ? -pid : pid), sig))
                 return 0;
        }
     }
@@ -1409,6 +1612,71 @@ win32_longpath(char *path)
     return path;
 }
 
+static void
+out_of_memory()
+{
+    if (PL_curinterp) {
+        dTHX;
+        /* Can't use PerlIO to write as it allocates memory */
+        PerlLIO_write(PerlIO_fileno(Perl_error_log),
+                      PL_no_mem, strlen(PL_no_mem));
+        my_exit(1);
+    }
+    exit(1);
+}
+
+/* The win32_ansipath() function takes a Unicode filename and converts it
+ * into the current Windows codepage. If some characters cannot be mapped,
+ * then it will convert the short name instead.
+ *
+ * The buffer to the ansi pathname must be freed with win32_free() when it
+ * it no longer needed.
+ *
+ * The argument to win32_ansipath() must exist before this function is
+ * called; otherwise there is no way to determine the short path name.
+ *
+ * Ideas for future refinement:
+ * - Only convert those segments of the path that are not in the current
+ *   codepage, but leave the other segments in their long form.
+ * - If the resulting name is longer than MAX_PATH, start converting
+ *   additional path segments into short names until the full name
+ *   is shorter than MAX_PATH.  Shorten the filename part last!
+ */
+DllExport char *
+win32_ansipath(const WCHAR *widename)
+{
+    char *name;
+    BOOL use_default = FALSE;
+    size_t widelen = wcslen(widename)+1;
+    int len = WideCharToMultiByte(CP_ACP, WC_NO_BEST_FIT_CHARS, widename, widelen,
+                                  NULL, 0, NULL, NULL);
+    name = win32_malloc(len);
+    if (!name)
+        out_of_memory();
+
+    WideCharToMultiByte(CP_ACP, WC_NO_BEST_FIT_CHARS, widename, widelen,
+                        name, len, NULL, &use_default);
+    if (use_default) {
+        DWORD shortlen = GetShortPathNameW(widename, NULL, 0);
+        if (shortlen) {
+            WCHAR *shortname = win32_malloc(shortlen*sizeof(WCHAR));
+            if (!shortname)
+                out_of_memory();
+            shortlen = GetShortPathNameW(widename, shortname, shortlen)+1;
+
+            len = WideCharToMultiByte(CP_ACP, WC_NO_BEST_FIT_CHARS, shortname, shortlen,
+                                      NULL, 0, NULL, NULL);
+            name = win32_realloc(name, len);
+            if (!name)
+                out_of_memory();
+            WideCharToMultiByte(CP_ACP, WC_NO_BEST_FIT_CHARS, shortname, shortlen,
+                                name, len, NULL, NULL);
+            win32_free(shortname);
+        }
+    }
+    return name;
+}
+
 DllExport char *
 win32_getenv(const char *name)
 {
@@ -1875,7 +2143,7 @@ win32_msgwait(pTHX_ DWORD count, LPHANDLE handles, DWORD timeout, LPDWORD result
        timeout += ticks;
     }
     while (1) {
-       DWORD result = MsgWaitForMultipleObjects(count,handles,FALSE,timeout-ticks, QS_ALLEVENTS);
+       DWORD result = MsgWaitForMultipleObjects(count,handles,FALSE,timeout-ticks, QS_POSTMESSAGE|QS_TIMER);
        if (resultp)
           *resultp = result;
        if (result == WAIT_TIMEOUT) {
@@ -4268,67 +4536,46 @@ win32_dynaload(const char* filename)
     return LoadLibraryExA(PerlDir_mapA(filename), NULL, LOAD_WITH_ALTERED_SEARCH_PATH);
 }
 
-static void
-forward(pTHX_ const char *function)
+XS(w32_SetChildShowWindow)
 {
     dXSARGS;
-    Perl_load_module(aTHX_ PERL_LOADMOD_NOIMPORT, newSVpvn("Win32",5), NULL);
-    PUSHMARK(SP-items);
-    call_pv(function, GIMME_V);
-}
-
-#define FORWARD(function) XS(w32_##function){ forward(aTHX_ "Win32::"#function); }
-FORWARD(GetCwd)
-FORWARD(SetCwd)
-FORWARD(GetNextAvailDrive)
-FORWARD(GetLastError)
-FORWARD(SetLastError)
-FORWARD(LoginName)
-FORWARD(NodeName)
-FORWARD(DomainName)
-FORWARD(FsType)
-FORWARD(GetOSVersion)
-FORWARD(IsWinNT)
-FORWARD(IsWin95)
-FORWARD(FormatMessage)
-FORWARD(Spawn)
-FORWARD(GetTickCount)
-FORWARD(GetShortPathName)
-FORWARD(GetFullPathName)
-FORWARD(GetLongPathName)
-FORWARD(CopyFile)
-FORWARD(Sleep)
-FORWARD(SetChildShowWindow)
-#undef FORWARD
+    BOOL use_showwindow = w32_use_showwindow;
+    /* use "unsigned short" because Perl has redefined "WORD" */
+    unsigned short showwindow = w32_showwindow;
+
+    if (items > 1)
+       Perl_croak(aTHX_ "usage: Win32::SetChildShowWindow($showwindow)");
+
+    if (items == 0 || !SvOK(ST(0)))
+        w32_use_showwindow = FALSE;
+    else {
+        w32_use_showwindow = TRUE;
+        w32_showwindow = (unsigned short)SvIV(ST(0));
+    }
+
+    EXTEND(SP, 1);
+    if (use_showwindow)
+        ST(0) = sv_2mortal(newSViv(showwindow));
+    else
+        ST(0) = &PL_sv_undef;
+    XSRETURN(1);
+}
 
 void
 Perl_init_os_extras(void)
 {
     dTHX;
     char *file = __FILE__;
+    CV *cv;
     dXSUB_SYS;
 
-    /* these names are Activeware compatible */
-    newXS("Win32::GetCwd", w32_GetCwd, file);
-    newXS("Win32::SetCwd", w32_SetCwd, file);
-    newXS("Win32::GetNextAvailDrive", w32_GetNextAvailDrive, file);
-    newXS("Win32::GetLastError", w32_GetLastError, file);
-    newXS("Win32::SetLastError", w32_SetLastError, file);
-    newXS("Win32::LoginName", w32_LoginName, file);
-    newXS("Win32::NodeName", w32_NodeName, file);
-    newXS("Win32::DomainName", w32_DomainName, file);
-    newXS("Win32::FsType", w32_FsType, file);
-    newXS("Win32::GetOSVersion", w32_GetOSVersion, file);
-    newXS("Win32::IsWinNT", w32_IsWinNT, file);
-    newXS("Win32::IsWin95", w32_IsWin95, file);
-    newXS("Win32::FormatMessage", w32_FormatMessage, file);
-    newXS("Win32::Spawn", w32_Spawn, file);
-    newXS("Win32::GetTickCount", w32_GetTickCount, file);
-    newXS("Win32::GetShortPathName", w32_GetShortPathName, file);
-    newXS("Win32::GetFullPathName", w32_GetFullPathName, file);
-    newXS("Win32::GetLongPathName", w32_GetLongPathName, file);
-    newXS("Win32::CopyFile", w32_CopyFile, file);
-    newXS("Win32::Sleep", w32_Sleep, file);
+    /* load Win32 CORE stubs, assuming Win32CORE was statically linked */
+    if ((cv = get_cv("Win32CORE::bootstrap", 0))) {
+       dSP;
+       PUSHMARK(SP);
+       (void)call_sv((SV *)cv, G_EVAL|G_DISCARD|G_VOID);
+    }
+
     newXS("Win32::SetChildShowWindow", w32_SetChildShowWindow, file);
 }
 
@@ -4405,9 +4652,109 @@ win32_ctrlhandler(DWORD dwCtrlType)
 #  include <crtdbg.h>
 #endif
 
+static void
+ansify_path(void)
+{
+    size_t len;
+    char *ansi_path;
+    WCHAR *wide_path;
+    WCHAR *wide_dir;
+
+    /* there is no Unicode environment on Windows 9X */
+    if (IsWin95())
+        return;
+
+    /* fetch Unicode version of PATH */
+    len = 2000;
+    wide_path = win32_malloc(len*sizeof(WCHAR));
+    while (wide_path) {
+        size_t newlen = GetEnvironmentVariableW(L"PATH", wide_path, len);
+        if (newlen < len)
+            break;
+        len = newlen;
+        wide_path = win32_realloc(wide_path, len*sizeof(WCHAR));
+    }
+    if (!wide_path)
+        return;
+
+    /* convert to ANSI pathnames */
+    wide_dir = wide_path;
+    ansi_path = NULL;
+    while (wide_dir) {
+        WCHAR *sep = wcschr(wide_dir, ';');
+        char *ansi_dir;
+        size_t ansi_len;
+        size_t wide_len;
+
+        if (sep)
+            *sep++ = '\0';
+
+        /* remove quotes around pathname */
+        if (*wide_dir == '"')
+            ++wide_dir;
+        wide_len = wcslen(wide_dir);
+        if (wide_len && wide_dir[wide_len-1] == '"')
+            wide_dir[wide_len-1] = '\0';
+
+        /* append ansi_dir to ansi_path */
+        ansi_dir = win32_ansipath(wide_dir);
+        ansi_len = strlen(ansi_dir);
+        if (ansi_path) {
+            size_t newlen = len + 1 + ansi_len;
+            ansi_path = win32_realloc(ansi_path, newlen+1);
+            if (!ansi_path)
+                break;
+            ansi_path[len] = ';';
+            memcpy(ansi_path+len+1, ansi_dir, ansi_len+1);
+            len = newlen;
+        }
+        else {
+            len = ansi_len;
+            ansi_path = win32_malloc(5+len+1);
+            if (!ansi_path)
+                break;
+            memcpy(ansi_path, "PATH=", 5);
+            memcpy(ansi_path+5, ansi_dir, len+1);
+            len += 5;
+        }
+        win32_free(ansi_dir);
+        wide_dir = sep;
+    }
+
+    if (ansi_path) {
+        /* Update C RTL environ array.  This will only have full effect if
+         * perl_parse() is later called with `environ` as the `env` argument.
+         * Otherwise S_init_postdump_symbols() will overwrite PATH again.
+         *
+         * We do have to ansify() the PATH before Perl has been fully
+         * initialized because S_find_script() uses the PATH when perl
+         * is being invoked with the -S option.  This happens before %ENV
+         * is initialized in S_init_postdump_symbols().
+         *
+         * XXX Is this a bug? Should S_find_script() use the environment
+         * XXX passed in the `env` arg to parse_perl()?
+         */
+        putenv(ansi_path);
+        /* Keep system environment in sync because S_init_postdump_symbols()
+         * will not call mg_set() if it initializes %ENV from `environ`.
+         */
+        SetEnvironmentVariableA("PATH", ansi_path+5);
+        /* We are intentionally leaking the ansi_path string here because
+         * the Borland runtime library puts it directly into the environ
+         * array.  The Microsoft runtime library seems to make a copy,
+         * but will leak the copy should it be replaced again later.
+         * Since this code is only called once during PERL_SYS_INIT this
+         * shouldn't really matter.
+         */
+    }
+    win32_free(wide_path);
+}
+
 void
 Perl_win32_init(int *argcp, char ***argvp)
 {
+    HMODULE module;
+
 #if _MSC_VER >= 1400
     _invalid_parameter_handler oldHandler, newHandler;
     newHandler = my_invalid_parameter_handler;
@@ -4424,6 +4771,23 @@ Perl_win32_init(int *argcp, char ***argvp)
     _control87(MCW_EM, MCW_EM);
 #endif
     MALLOC_INIT;
+
+    module = GetModuleHandle("ntdll.dll");
+    if (module) {
+        *(FARPROC*)&pfnZwQuerySystemInformation = GetProcAddress(module, "ZwQuerySystemInformation");
+    }
+
+    module = GetModuleHandle("kernel32.dll");
+    if (module) {
+        *(FARPROC*)&pfnCreateToolhelp32Snapshot = GetProcAddress(module, "CreateToolhelp32Snapshot");
+        *(FARPROC*)&pfnProcess32First           = GetProcAddress(module, "Process32First");
+        *(FARPROC*)&pfnProcess32Next            = GetProcAddress(module, "Process32Next");
+    }
+
+    g_osver.dwOSVersionInfoSize = sizeof(g_osver);
+    GetVersionEx(&g_osver);
+
+    ansify_path();
 }
 
 void
@@ -4467,7 +4831,6 @@ win32_signal(int sig, Sighandler_t subcode)
 
 #ifdef HAVE_INTERP_INTERN
 
-
 static void
 win32_csighandler(int sig)
 {
@@ -4506,11 +4869,6 @@ Perl_sys_intern_init(pTHX)
 {
     int i;
 
-    if (g_osver.dwOSVersionInfoSize == 0) {
-        g_osver.dwOSVersionInfoSize = sizeof(g_osver);
-        GetVersionEx(&g_osver);
-    }
-
     w32_perlshell_tokens       = Nullch;
     w32_perlshell_vec          = (char**)NULL;
     w32_perlshell_items                = 0;
@@ -4528,7 +4886,7 @@ Perl_sys_intern_init(pTHX)
     for (i=0; i < SIG_SIZE; i++) {
        w32_sighandler[i] = SIG_DFL;
     }
-#  ifdef MULTIPLICTY
+#  ifdef MULTIPLICITY
     if (my_perl == PL_curinterp) {
 #  else
     {