dlls/kernel/module.c

   1 /*
   2  * Modules
   3  *
   4  * Copyright 1995 Alexandre Julliard
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, write to the Free Software
  18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19  */
  20
  21 #include "config.h"
  22 #include "wine/port.h"
  23
  24 #include <fcntl.h>
  25 #include <stdio.h>
  26 #include <stdlib.h>
  27 #include <string.h>
  28 #include <sys/types.h>
  29 #ifdef HAVE_UNISTD_H
  30 # include <unistd.h>
  31 #endif
  32 #include "wine/winbase16.h"
  33 #include "winerror.h"
  34 #include "ntstatus.h"
  35 #include "windef.h"
  36 #include "winbase.h"
  37 #include "winreg.h"
  38 #include "winternl.h"
  39 #include "thread.h"
  40 #include "module.h"
  41
  42 #include "wine/debug.h"
  43 #include "wine/unicode.h"
  44 #include "wine/server.h"
  45
  46 WINE_DEFAULT_DEBUG_CHANNEL(module);
  47 WINE_DECLARE_DEBUG_CHANNEL(loaddll);
  48
  49
  50 /****************************************************************************
  51  *              DisableThreadLibraryCalls (KERNEL32.@)
  52  *
  53  * Inform the module loader that thread notifications are not required for a dll.
  54  *
  55  * PARAMS
  56  *  hModule [I] Module handle to skip calls for
  57  *
  58  * RETURNS
  59  *  Success: TRUE. Thread attach and detach notifications will not be sent
  60  *           to hModule.
  61  *  Failure: FALSE. Use GetLastError() to determine the cause.
  62  *
  63  * NOTES
  64  *  This is typically called from the dll entry point of a dll during process
  65  *  attachment, for dlls that do not need to process thread notifications.
  66  */
  67 BOOL WINAPI DisableThreadLibraryCalls( HMODULE hModule )
  68 {
  69     NTSTATUS    nts = LdrDisableThreadCalloutsForDll( hModule );
  70     if (nts == STATUS_SUCCESS) return TRUE;
  71
  72     SetLastError( RtlNtStatusToDosError( nts ) );
  73     return FALSE;
  74 }
  75
  76
  77 /* Check whether a file is an OS/2 or a very old Windows executable
  78  * by testing on import of KERNEL.
  79  *
  80  * FIXME: is reading the module imports the only way of discerning
  81  *        old Windows binaries from OS/2 ones ? At least it seems so...
  82  */
  83 static enum binary_type MODULE_Decide_OS2_OldWin(HANDLE hfile, const IMAGE_DOS_HEADER *mz,
  84                                                  const IMAGE_OS2_HEADER *ne)
  85 {
  86     DWORD currpos = SetFilePointer( hfile, 0, NULL, SEEK_CUR);
  87     enum binary_type ret = BINARY_OS216;
  88     LPWORD modtab = NULL;
  89     LPSTR nametab = NULL;
  90     DWORD len;
  91     int i;
  92
  93     /* read modref table */
  94     if ( (SetFilePointer( hfile, mz->e_lfanew + ne->ne_modtab, NULL, SEEK_SET ) == -1)
  95       || (!(modtab = HeapAlloc( GetProcessHeap(), 0, ne->ne_cmod*sizeof(WORD))))
  96       || (!(ReadFile(hfile, modtab, ne->ne_cmod*sizeof(WORD), &len, NULL)))
  97       || (len != ne->ne_cmod*sizeof(WORD)) )
  98         goto broken;
  99
 100     /* read imported names table */
 101     if ( (SetFilePointer( hfile, mz->e_lfanew + ne->ne_imptab, NULL, SEEK_SET ) == -1)
 102       || (!(nametab = HeapAlloc( GetProcessHeap(), 0, ne->ne_enttab - ne->ne_imptab)))
 103       || (!(ReadFile(hfile, nametab, ne->ne_enttab - ne->ne_imptab, &len, NULL)))
 104       || (len != ne->ne_enttab - ne->ne_imptab) )
 105         goto broken;
 106
 107     for (i=0; i < ne->ne_cmod; i++)
 108     {
 109         LPSTR module = &nametab[modtab[i]];
 110         TRACE("modref: %.*s\n", module[0], &module[1]);
 111         if (!(strncmp(&module[1], "KERNEL", module[0])))
 112         { /* very old Windows file */
 113             MESSAGE("This seems to be a very old (pre-3.0) Windows executable. Expect crashes, especially if this is a real-mode binary !\n");
 114             ret = BINARY_WIN16;
 115             goto good;
 116         }
 117     }
 118
 119 broken:
 120     ERR("Hmm, an error occurred. Is this binary file broken ?\n");
 121
 122 good:
 123     HeapFree( GetProcessHeap(), 0, modtab);
 124     HeapFree( GetProcessHeap(), 0, nametab);
 125     SetFilePointer( hfile, currpos, NULL, SEEK_SET); /* restore filepos */
 126     return ret;
 127 }
 128
 129 /***********************************************************************
 130  *           MODULE_GetBinaryType
 131  */
 132 enum binary_type MODULE_GetBinaryType( HANDLE hfile )
 133 {
 134     union
 135     {
 136         struct
 137         {
 138             unsigned char magic[4];
 139             unsigned char ignored[12];
 140             unsigned short type;
 141         } elf;
 142         struct
 143         {
 144             unsigned long magic;
 145             unsigned long cputype;
 146             unsigned long cpusubtype;
 147             unsigned long filetype;
 148         } macho;
 149         IMAGE_DOS_HEADER mz;
 150     } header;
 151
 152     char magic[4];
 153     DWORD len;
 154
 155     /* Seek to the start of the file and read the header information. */
 156     if (SetFilePointer( hfile, 0, NULL, SEEK_SET ) == -1)
 157         return BINARY_UNKNOWN;
 158     if (!ReadFile( hfile, &header, sizeof(header), &len, NULL ) || len != sizeof(header))
 159         return BINARY_UNKNOWN;
 160
 161     if (!memcmp( header.elf.magic, "\177ELF", 4 ))
 162     {
 163         /* FIXME: we don't bother to check byte order, architecture, etc. */
 164         switch(header.elf.type)
 165         {
 166         case 2: return BINARY_UNIX_EXE;
 167         case 3: return BINARY_UNIX_LIB;
 168         }
 169         return BINARY_UNKNOWN;
 170     }
 171
 172     /* Mach-o File with Endian set to Big Endian  or Little Endian*/
 173     if (header.macho.magic == 0xfeedface || header.macho.magic == 0xecafdeef)
 174     {
 175         switch(header.macho.filetype)
 176         {
 177             case 0x8: /* MH_BUNDLE */ return BINARY_UNIX_LIB;
 178         }
 179         return BINARY_UNKNOWN;
 180     }
 181
 182     /* Not ELF, try DOS */
 183
 184     if (header.mz.e_magic == IMAGE_DOS_SIGNATURE)
 185     {
 186         /* We do have a DOS image so we will now try to seek into
 187          * the file by the amount indicated by the field
 188          * "Offset to extended header" and read in the
 189          * "magic" field information at that location.
 190          * This will tell us if there is more header information
 191          * to read or not.
 192          */
 193         if (SetFilePointer( hfile, header.mz.e_lfanew, NULL, SEEK_SET ) == -1)
 194             return BINARY_DOS;
 195         if (!ReadFile( hfile, magic, sizeof(magic), &len, NULL ) || len != sizeof(magic))
 196             return BINARY_DOS;
 197
 198         /* Reading the magic field succeeded so
 199          * we will try to determine what type it is.
 200          */
 201         if (!memcmp( magic, "PE\0\0", 4 ))
 202         {
 203             IMAGE_FILE_HEADER FileHeader;
 204
 205             if (ReadFile( hfile, &FileHeader, sizeof(FileHeader), &len, NULL ) && len == sizeof(FileHeader))
 206             {
 207                 if (FileHeader.Characteristics & IMAGE_FILE_DLL) return BINARY_PE_DLL;
 208                 return BINARY_PE_EXE;
 209             }
 210             return BINARY_DOS;
 211         }
 212
 213         if (!memcmp( magic, "NE", 2 ))
 214         {
 215             /* This is a Windows executable (NE) header.  This can
 216              * mean either a 16-bit OS/2 or a 16-bit Windows or even a
 217              * DOS program (running under a DOS extender).  To decide
 218              * which, we'll have to read the NE header.
 219              */
 220             IMAGE_OS2_HEADER ne;
 221             if (    SetFilePointer( hfile, header.mz.e_lfanew, NULL, SEEK_SET ) != -1
 222                     && ReadFile( hfile, &ne, sizeof(ne), &len, NULL )
 223                     && len == sizeof(ne) )
 224             {
 225                 switch ( ne.ne_exetyp )
 226                 {
 227                 case 2:  return BINARY_WIN16;
 228                 case 5:  return BINARY_DOS;
 229                 default: return MODULE_Decide_OS2_OldWin(hfile, &header.mz, &ne);
 230                 }
 231             }
 232             /* Couldn't read header, so abort. */
 233             return BINARY_DOS;
 234         }
 235
 236         /* Unknown extended header, but this file is nonetheless DOS-executable. */
 237         return BINARY_DOS;
 238     }
 239
 240     return BINARY_UNKNOWN;
 241 }
 242
 243 /***********************************************************************
 244  *             GetBinaryTypeW                     [KERNEL32.@]
 245  *
 246  * Determine whether a file is executable, and if so, what kind.
 247  *
 248  * PARAMS
 249  *  lpApplicationName [I] Path of the file to check
 250  *  lpBinaryType      [O] Destination for the binary type
 251  *
 252  * RETURNS
 253  *  TRUE, if the file is an executable, in which case lpBinaryType is set.
 254  *  FALSE, if the file is not an executable or if the function fails.
 255  *
 256  * NOTES
 257  *  The type of executable is a property that determines which subsytem an
 258  *  executable file runs under. lpBinaryType can be set to one of the following
 259  *  values:
 260  *   SCS_32BIT_BINARY: A Win32 based application
 261  *   SCS_DOS_BINARY: An MS-Dos based application
 262  *   SCS_WOW_BINARY: A Win16 based application
 263  *   SCS_PIF_BINARY: A PIF file that executes an MS-Dos based app
 264  *   SCS_POSIX_BINARY: A POSIX based application ( Not implemented )
 265  *   SCS_OS216_BINARY: A 16bit OS/2 based application
 266  *
 267  *  To find the binary type, this function reads in the files header information.
 268  *  If extended header information is not present it will assume that the file
 269  *  is a DOS executable. If extended header information is present it will
 270  *  determine if the file is a 16 or 32 bit Windows executable by checking the
 271  *  flags in the header.
 272  *
 273  *  ".com" and ".pif" files are only recognized by their file name extension,
 274  *  as per native Windows.
 275  */
 276 BOOL WINAPI GetBinaryTypeW( LPCWSTR lpApplicationName, LPDWORD lpBinaryType )
 277 {
 278     BOOL ret = FALSE;
 279     HANDLE hfile;
 280
 281     TRACE("%s\n", debugstr_w(lpApplicationName) );
 282
 283     /* Sanity check.
 284      */
 285     if ( lpApplicationName == NULL || lpBinaryType == NULL )
 286         return FALSE;
 287
 288     /* Open the file indicated by lpApplicationName for reading.
 289      */
 290     hfile = CreateFileW( lpApplicationName, GENERIC_READ, FILE_SHARE_READ,
 291                          NULL, OPEN_EXISTING, 0, 0 );
 292     if ( hfile == INVALID_HANDLE_VALUE )
 293         return FALSE;
 294
 295     /* Check binary type
 296      */
 297     switch(MODULE_GetBinaryType( hfile ))
 298     {
 299     case BINARY_UNKNOWN:
 300     {
 301         static const WCHAR comW[] = { '.','C','O','M',0 };
 302         static const WCHAR pifW[] = { '.','P','I','F',0 };
 303         const WCHAR *ptr;
 304
 305         /* try to determine from file name */
 306         ptr = strrchrW( lpApplicationName, '.' );
 307         if (!ptr) break;
 308         if (!strcmpiW( ptr, comW ))
 309         {
 310             *lpBinaryType = SCS_DOS_BINARY;
 311             ret = TRUE;
 312         }
 313         else if (!strcmpiW( ptr, pifW ))
 314         {
 315             *lpBinaryType = SCS_PIF_BINARY;
 316             ret = TRUE;
 317         }
 318         break;
 319     }
 320     case BINARY_PE_EXE:
 321     case BINARY_PE_DLL:
 322         *lpBinaryType = SCS_32BIT_BINARY;
 323         ret = TRUE;
 324         break;
 325     case BINARY_WIN16:
 326         *lpBinaryType = SCS_WOW_BINARY;
 327         ret = TRUE;
 328         break;
 329     case BINARY_OS216:
 330         *lpBinaryType = SCS_OS216_BINARY;
 331         ret = TRUE;
 332         break;
 333     case BINARY_DOS:
 334         *lpBinaryType = SCS_DOS_BINARY;
 335         ret = TRUE;
 336         break;
 337     case BINARY_UNIX_EXE:
 338     case BINARY_UNIX_LIB:
 339         ret = FALSE;
 340         break;
 341     }
 342
 343     CloseHandle( hfile );
 344     return ret;
 345 }
 346
 347 /***********************************************************************
 348  *             GetBinaryTypeA                     [KERNEL32.@]
 349  *             GetBinaryType                      [KERNEL32.@]
 350  */
 351 BOOL WINAPI GetBinaryTypeA( LPCSTR lpApplicationName, LPDWORD lpBinaryType )
 352 {
 353     ANSI_STRING app_nameA;
 354     NTSTATUS status;
 355
 356     TRACE("%s\n", debugstr_a(lpApplicationName));
 357
 358     /* Sanity check.
 359      */
 360     if ( lpApplicationName == NULL || lpBinaryType == NULL )
 361         return FALSE;
 362
 363     RtlInitAnsiString(&app_nameA, lpApplicationName);
 364     status = RtlAnsiStringToUnicodeString(&NtCurrentTeb()->StaticUnicodeString,
 365                                           &app_nameA, FALSE);
 366     if (!status)
 367         return GetBinaryTypeW(NtCurrentTeb()->StaticUnicodeString.Buffer, lpBinaryType);
 368
 369     SetLastError(RtlNtStatusToDosError(status));
 370     return FALSE;
 371 }
 372
 373
 374 /***********************************************************************
 375  *              GetModuleHandleA         (KERNEL32.@)
 376  *              GetModuleHandle32        (KERNEL.488)
 377  *
 378  * Get the handle of a dll loaded into the process address space.
 379  *
 380  * PARAMS
 381  *  module [I] Name of the dll
 382  *
 383  * RETURNS
 384  *  Success: A handle to the loaded dll.
 385  *  Failure: A NULL handle. Use GetLastError() to determine the cause.
 386  */
 387 HMODULE WINAPI GetModuleHandleA(LPCSTR module)
 388 {
 389     NTSTATUS            nts;
 390     HMODULE             ret;
 391     UNICODE_STRING      wstr;
 392
 393     if (!module) return NtCurrentTeb()->Peb->ImageBaseAddress;
 394
 395     RtlCreateUnicodeStringFromAsciiz(&wstr, module);
 396     nts = LdrGetDllHandle(0, 0, &wstr, &ret);
 397     RtlFreeUnicodeString( &wstr );
 398     if (nts != STATUS_SUCCESS)
 399     {
 400         ret = 0;
 401         SetLastError( RtlNtStatusToDosError( nts ) );
 402     }
 403     return ret;
 404 }
 405
 406 /***********************************************************************
 407  *              GetModuleHandleW (KERNEL32.@)
 408  *
 409  * Unicode version of GetModuleHandleA.
 410  */
 411 HMODULE WINAPI GetModuleHandleW(LPCWSTR module)
 412 {
 413     NTSTATUS            nts;
 414     HMODULE             ret;
 415     UNICODE_STRING      wstr;
 416
 417     if (!module) return NtCurrentTeb()->Peb->ImageBaseAddress;
 418
 419     RtlInitUnicodeString( &wstr, module );
 420     nts = LdrGetDllHandle( 0, 0, &wstr, &ret);
 421     if (nts != STATUS_SUCCESS)
 422     {
 423         SetLastError( RtlNtStatusToDosError( nts ) );
 424         ret = 0;
 425     }
 426     return ret;
 427 }
 428
 429
 430 /***********************************************************************
 431  *              GetModuleFileNameA      (KERNEL32.@)
 432  *              GetModuleFileName32     (KERNEL.487)
 433  *
 434  * Get the file name of a loaded module from its handle.
 435  *
 436  * RETURNS
 437  *  Success: The length of the file name, excluding the terminating NUL.
 438  *  Failure: 0. Use GetLastError() to determine the cause.
 439  *
 440  * NOTES
 441  *  This function always returns the long path of hModule (as opposed to
 442  *  GetModuleFileName16() which returns short paths when the modules version
 443  *  field is < 4.0).
 444  */
 445 DWORD WINAPI GetModuleFileNameA(
 446         HMODULE hModule,        /* [in] Module handle (32 bit) */
 447         LPSTR lpFileName,       /* [out] Destination for file name */
 448         DWORD size )            /* [in] Size of lpFileName in characters */
 449 {
 450     LPWSTR filenameW = HeapAlloc( GetProcessHeap(), 0, size * sizeof(WCHAR) );
 451
 452     if (!filenameW)
 453     {
 454         SetLastError( ERROR_NOT_ENOUGH_MEMORY );
 455         return 0;
 456     }
 457     GetModuleFileNameW( hModule, filenameW, size );
 458     WideCharToMultiByte( CP_ACP, 0, filenameW, -1, lpFileName, size, NULL, NULL );
 459     HeapFree( GetProcessHeap(), 0, filenameW );
 460     return strlen( lpFileName );
 461 }
 462
 463 /***********************************************************************
 464  *              GetModuleFileNameW      (KERNEL32.@)
 465  *
 466  * Unicode version of GetModuleFileNameA.
 467  */
 468 DWORD WINAPI GetModuleFileNameW( HMODULE hModule, LPWSTR lpFileName, DWORD size )
 469 {
 470     ULONG magic;
 471
 472     lpFileName[0] = 0;
 473
 474     LdrLockLoaderLock( 0, NULL, &magic );
 475     if (!hModule && !(NtCurrentTeb()->tibflags & TEBF_WIN32))
 476     {
 477         /* 16-bit task - get current NE module name */
 478         NE_MODULE *pModule = NE_GetPtr( GetCurrentTask() );
 479         if (pModule)
 480         {
 481             WCHAR    path[MAX_PATH];
 482
 483             MultiByteToWideChar( CP_ACP, 0, NE_MODULE_NAME(pModule), -1, path, MAX_PATH );
 484             GetLongPathNameW(path, lpFileName, size);
 485         }
 486     }
 487     else
 488     {
 489         LDR_MODULE* pldr;
 490         NTSTATUS    nts;
 491
 492         if (!hModule) hModule = NtCurrentTeb()->Peb->ImageBaseAddress;
 493         nts = LdrFindEntryForAddress( hModule, &pldr );
 494         if (nts == STATUS_SUCCESS) lstrcpynW(lpFileName, pldr->FullDllName.Buffer, size);
 495         else SetLastError( RtlNtStatusToDosError( nts ) );
 496
 497     }
 498     LdrUnlockLoaderLock( 0, magic );
 499
 500     TRACE( "%s\n", debugstr_w(lpFileName) );
 501     return strlenW(lpFileName);
 502 }
 503
 504
 505 /***********************************************************************
 506  *           get_dll_system_path
 507  */
 508 static const WCHAR *get_dll_system_path(void)
 509 {
 510     static WCHAR *path;
 511
 512     if (!path)
 513     {
 514         WCHAR *p, *exe_name;
 515         int len = 3;
 516
 517         exe_name = NtCurrentTeb()->Peb->ProcessParameters->ImagePathName.Buffer;
 518         if (!(p = strrchrW( exe_name, '\\' ))) p = exe_name;
 519         /* include trailing backslash only on drive root */
 520         if (p == exe_name + 2 && exe_name[1] == ':') p++;
 521         len += p - exe_name;
 522         len += GetSystemDirectoryW( NULL, 0 );
 523         len += GetWindowsDirectoryW( NULL, 0 );
 524         path = HeapAlloc( GetProcessHeap(), 0, len * sizeof(WCHAR) );
 525         memcpy( path, exe_name, (p - exe_name) * sizeof(WCHAR) );
 526         p = path + (p - exe_name);
 527         *p++ = ';';
 528         *p++ = '.';
 529         *p++ = ';';
 530         GetSystemDirectoryW( p, path + len - p);
 531         p += strlenW(p);
 532         *p++ = ';';
 533         GetWindowsDirectoryW( p, path + len - p);
 534     }
 535     return path;
 536 }
 537
 538
 539 /******************************************************************
 540  *              get_dll_load_path
 541  *
 542  * Compute the load path to use for a given dll.
 543  * Returned pointer must be freed by caller.
 544  */
 545 static WCHAR *get_dll_load_path( LPCWSTR module )
 546 {
 547     static const WCHAR pathW[] = {'P','A','T','H',0};
 548
 549     const WCHAR *system_path = get_dll_system_path();
 550     const WCHAR *mod_end = NULL;
 551     UNICODE_STRING name, value;
 552     WCHAR *p, *ret;
 553     int len = 0, path_len = 0;
 554
 555     /* adjust length for module name */
 556
 557     if (module)
 558     {
 559         mod_end = module;
 560         if ((p = strrchrW( mod_end, '\\' ))) mod_end = p;
 561         if ((p = strrchrW( mod_end, '/' ))) mod_end = p;
 562         if (mod_end == module + 2 && module[1] == ':') mod_end++;
 563         if (mod_end == module && module[0] && module[1] == ':') mod_end += 2;
 564         len += (mod_end - module);
 565         system_path = strchrW( system_path, ';' );
 566     }
 567     len += strlenW( system_path ) + 2;
 568
 569     /* get the PATH variable */
 570
 571     RtlInitUnicodeString( &name, pathW );
 572     value.Length = 0;
 573     value.MaximumLength = 0;
 574     value.Buffer = NULL;
 575     if (RtlQueryEnvironmentVariable_U( NULL, &name, &value ) == STATUS_BUFFER_TOO_SMALL)
 576         path_len = value.Length;
 577
 578     if (!(ret = HeapAlloc( GetProcessHeap(), 0, path_len + len * sizeof(WCHAR) ))) return NULL;
 579     p = ret;
 580     if (module)
 581     {
 582         memcpy( ret, module, (mod_end - module) * sizeof(WCHAR) );
 583         p += (mod_end - module);
 584     }
 585     strcpyW( p, system_path );
 586     p += strlenW(p);
 587     *p++ = ';';
 588     value.Buffer = p;
 589     value.MaximumLength = path_len;
 590
 591     while (RtlQueryEnvironmentVariable_U( NULL, &name, &value ) == STATUS_BUFFER_TOO_SMALL)
 592     {
 593         WCHAR *new_ptr;
 594
 595         /* grow the buffer and retry */
 596         path_len = value.Length;
 597         if (!(new_ptr = HeapReAlloc( GetProcessHeap(), 0, ret, path_len + len * sizeof(WCHAR) )))
 598         {
 599             HeapFree( GetProcessHeap(), 0, ret );
 600             return NULL;
 601         }
 602         value.Buffer = new_ptr + (value.Buffer - ret);
 603         value.MaximumLength = path_len;
 604         ret = new_ptr;
 605     }
 606     value.Buffer[value.Length / sizeof(WCHAR)] = 0;
 607     return ret;
 608 }
 609
 610
 611 /******************************************************************
 612  *              MODULE_InitLoadPath
 613  *
 614  * Create the initial dll load path.
 615  */
 616 void MODULE_InitLoadPath(void)
 617 {
 618     WCHAR *path = get_dll_load_path( NULL );
 619     RtlInitUnicodeString( &NtCurrentTeb()->Peb->ProcessParameters->DllPath, path );
 620 }
 621
 622
 623 /******************************************************************
 624  *              load_library_as_datafile
 625  */
 626 static BOOL load_library_as_datafile( LPCWSTR name, HMODULE* hmod)
 627 {
 628     static const WCHAR dotDLL[] = {'.','d','l','l',0};
 629
 630     WCHAR filenameW[MAX_PATH];
 631     HANDLE hFile = INVALID_HANDLE_VALUE;
 632     HANDLE mapping;
 633     HMODULE module;
 634
 635     *hmod = 0;
 636
 637     if (SearchPathW( NULL, (LPCWSTR)name, dotDLL, sizeof(filenameW) / sizeof(filenameW[0]),
 638                      filenameW, NULL ))
 639     {
 640         hFile = CreateFileW( filenameW, GENERIC_READ, FILE_SHARE_READ,
 641                              NULL, OPEN_EXISTING, 0, 0 );
 642     }
 643     if (hFile == INVALID_HANDLE_VALUE) return FALSE;
 644
 645     mapping = CreateFileMappingW( hFile, NULL, PAGE_READONLY, 0, 0, NULL );
 646     CloseHandle( hFile );
 647     if (!mapping) return FALSE;
 648
 649     module = MapViewOfFile( mapping, FILE_MAP_READ, 0, 0, 0 );
 650     CloseHandle( mapping );
 651     if (!module) return FALSE;
 652
 653     /* make sure it's a valid PE file */
 654     if (!RtlImageNtHeader(module))
 655     {
 656         UnmapViewOfFile( module );
 657         return FALSE;
 658     }
 659     *hmod = (HMODULE)((char *)module + 1);  /* set low bit of handle to indicate datafile module */
 660     return TRUE;
 661 }
 662
 663
 664 /******************************************************************
 665  *              load_library
 666  *
 667  * Helper for LoadLibraryExA/W.
 668  */
 669 static HMODULE load_library( const UNICODE_STRING *libname, DWORD flags )
 670 {
 671     NTSTATUS nts;
 672     HMODULE hModule;
 673     WCHAR *load_path;
 674
 675     if (flags & LOAD_LIBRARY_AS_DATAFILE)
 676     {
 677         /* The method in load_library_as_datafile allows searching for the
 678          * 'native' libraries only
 679          */
 680         if (load_library_as_datafile( libname->Buffer, &hModule )) return hModule;
 681         flags |= DONT_RESOLVE_DLL_REFERENCES; /* Just in case */
 682         /* Fallback to normal behaviour */
 683     }
 684
 685     load_path = get_dll_load_path( flags & LOAD_WITH_ALTERED_SEARCH_PATH ? libname->Buffer : NULL );
 686     nts = LdrLoadDll( load_path, flags, libname, &hModule );
 687     HeapFree( GetProcessHeap(), 0, load_path );
 688     if (nts != STATUS_SUCCESS)
 689     {
 690         hModule = 0;
 691         SetLastError( RtlNtStatusToDosError( nts ) );
 692     }
 693     return hModule;
 694 }
 695
 696
 697 /******************************************************************
 698  *              LoadLibraryExA          (KERNEL32.@)
 699  *
 700  * Load a dll file into the process address space.
 701  *
 702  * PARAMS
 703  *  libname [I] Name of the file to load
 704  *  hfile   [I] Reserved, must be 0.
 705  *  flags   [I] Flags for loading the dll
 706  *
 707  * RETURNS
 708  *  Success: A handle to the loaded dll.
 709  *  Failure: A NULL handle. Use GetLastError() to determine the cause.
 710  *
 711  * NOTES
 712  * The HFILE parameter is not used and marked reserved in the SDK. I can
 713  * only guess that it should force a file to be mapped, but I rather
 714  * ignore the parameter because it would be extremely difficult to
 715  * integrate this with different types of module representations.
 716  */
 717 HMODULE WINAPI LoadLibraryExA(LPCSTR libname, HANDLE hfile, DWORD flags)
 718 {
 719     UNICODE_STRING      wstr;
 720     HMODULE             hModule;
 721
 722     if (!libname)
 723     {
 724         SetLastError(ERROR_INVALID_PARAMETER);
 725         return 0;
 726     }
 727     RtlCreateUnicodeStringFromAsciiz( &wstr, libname );
 728     hModule = load_library( &wstr, flags );
 729     RtlFreeUnicodeString( &wstr );
 730     return hModule;
 731 }
 732
 733 /***********************************************************************
 734  *           LoadLibraryExW       (KERNEL32.@)
 735  *
 736  * Unicode version of LoadLibraryExA.
 737  */
 738 HMODULE WINAPI LoadLibraryExW(LPCWSTR libnameW, HANDLE hfile, DWORD flags)
 739 {
 740     UNICODE_STRING      wstr;
 741
 742     if (!libnameW)
 743     {
 744         SetLastError(ERROR_INVALID_PARAMETER);
 745         return 0;
 746     }
 747     RtlInitUnicodeString( &wstr, libnameW );
 748     return load_library( &wstr, flags );
 749 }
 750
 751 /***********************************************************************
 752  *           LoadLibraryA         (KERNEL32.@)
 753  *
 754  * Load a dll file into the process address space.
 755  *
 756  * PARAMS
 757  *  libname [I] Name of the file to load
 758  *
 759  * RETURNS
 760  *  Success: A handle to the loaded dll.
 761  *  Failure: A NULL handle. Use GetLastError() to determine the cause.
 762  *
 763  * NOTES
 764  * See LoadLibraryExA().
 765  */
 766 HMODULE WINAPI LoadLibraryA(LPCSTR libname)
 767 {
 768     return LoadLibraryExA(libname, 0, 0);
 769 }
 770
 771 /***********************************************************************
 772  *           LoadLibraryW         (KERNEL32.@)
 773  *
 774  * Unicode version of LoadLibraryA.
 775  */
 776 HMODULE WINAPI LoadLibraryW(LPCWSTR libnameW)
 777 {
 778     return LoadLibraryExW(libnameW, 0, 0);
 779 }
 780
 781 /***********************************************************************
 782  *           FreeLibrary   (KERNEL32.@)
 783  *           FreeLibrary32 (KERNEL.486)
 784  *
 785  * Free a dll loaded into the process address space.
 786  *
 787  * PARAMS
 788  *  hLibModule [I] Handle to the dll returned by LoadLibraryA().
 789  *
 790  * RETURNS
 791  *  Success: TRUE. The dll is removed if it is not still in use.
 792  *  Failure: FALSE. Use GetLastError() to determine the cause.
 793  */
 794 BOOL WINAPI FreeLibrary(HINSTANCE hLibModule)
 795 {
 796     BOOL                retv = FALSE;
 797     NTSTATUS            nts;
 798
 799     if (!hLibModule)
 800     {
 801         SetLastError( ERROR_INVALID_HANDLE );
 802         return FALSE;
 803     }
 804
 805     if ((ULONG_PTR)hLibModule & 1)
 806     {
 807         /* this is a LOAD_LIBRARY_AS_DATAFILE module */
 808         char *ptr = (char *)hLibModule - 1;
 809         UnmapViewOfFile( ptr );
 810         return TRUE;
 811     }
 812
 813     if ((nts = LdrUnloadDll( hLibModule )) == STATUS_SUCCESS) retv = TRUE;
 814     else SetLastError( RtlNtStatusToDosError( nts ) );
 815
 816     return retv;
 817 }
 818
 819 /***********************************************************************
 820  *           GetProcAddress             (KERNEL32.@)
 821  *
 822  * Find the address of an exported symbol in a loaded dll.
 823  *
 824  * PARAMS
 825  *  hModule  [I] Handle to the dll returned by LoadLibraryA().
 826  *  function [I] Name of the symbol, or an integer ordinal number < 16384
 827  *
 828  * RETURNS
 829  *  Success: A pointer to the symbol in the process address space.
 830  *  Failure: NULL. Use GetLastError() to determine the cause.
 831  */
 832 FARPROC WINAPI GetProcAddress( HMODULE hModule, LPCSTR function )
 833 {
 834     NTSTATUS    nts;
 835     FARPROC     fp;
 836
 837     if (HIWORD(function))
 838     {
 839         ANSI_STRING     str;
 840
 841         RtlInitAnsiString( &str, function );
 842         nts = LdrGetProcedureAddress( hModule, &str, 0, (void**)&fp );
 843     }
 844     else
 845         nts = LdrGetProcedureAddress( hModule, NULL, (DWORD)function, (void**)&fp );
 846     if (nts != STATUS_SUCCESS)
 847     {
 848         SetLastError( RtlNtStatusToDosError( nts ) );
 849         fp = NULL;
 850     }
 851     return fp;
 852 }
 853
 854 /***********************************************************************
 855  *           GetProcAddress32                   (KERNEL.453)
 856  *
 857  * Find the address of an exported symbol in a loaded dll.
 858  *
 859  * PARAMS
 860  *  hModule  [I] Handle to the dll returned by LoadLibraryA().
 861  *  function [I] Name of the symbol, or an integer ordinal number < 16384
 862  *
 863  * RETURNS
 864  *  Success: A pointer to the symbol in the process address space.
 865  *  Failure: NULL. Use GetLastError() to determine the cause.
 866  */
 867 FARPROC WINAPI GetProcAddress32_16( HMODULE hModule, LPCSTR function )
 868 {
 869     /* FIXME: we used to disable snoop when returning proc for Win16 subsystem */
 870     return GetProcAddress( hModule, function );
 871 }