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 "ntstatus.h"
  33 #define WIN32_NO_STATUS
  34 #include "wine/winbase16.h"
  35 #include "winerror.h"
  36 #include "windef.h"
  37 #include "winbase.h"
  38 #include "winternl.h"
  39 #include "thread.h"
  40 #include "kernel_private.h"
  41
  42 #include "wine/exception.h"
  43 #include "wine/debug.h"
  44 #include "wine/unicode.h"
  45
  46 WINE_DEFAULT_DEBUG_CHANNEL(module);
  47
  48 static WCHAR *dll_directory;  /* extra path for SetDllDirectoryW */
  49
  50 static CRITICAL_SECTION dlldir_section;
  51 static CRITICAL_SECTION_DEBUG critsect_debug =
  52 {
  53     0, 0, &dlldir_section,
  54     { &critsect_debug.ProcessLocksList, &critsect_debug.ProcessLocksList },
  55       0, 0, { (DWORD_PTR)(__FILE__ ": dlldir_section") }
  56 };
  57 static CRITICAL_SECTION dlldir_section = { &critsect_debug, -1, 0, 0, 0, 0 };
  58
  59
  60 /****************************************************************************
  61  *              GetDllDirectoryA   (KERNEL32.@)
  62  */
  63 DWORD WINAPI GetDllDirectoryA( DWORD buf_len, LPSTR buffer )
  64 {
  65     DWORD len;
  66
  67     RtlEnterCriticalSection( &dlldir_section );
  68     len = dll_directory ? FILE_name_WtoA( dll_directory, strlenW(dll_directory), NULL, 0 ) : 0;
  69     if (buffer && buf_len > len)
  70     {
  71         if (dll_directory) FILE_name_WtoA( dll_directory, -1, buffer, buf_len );
  72         else *buffer = 0;
  73     }
  74     else
  75     {
  76         len++;  /* for terminating null */
  77         if (buffer) *buffer = 0;
  78     }
  79     RtlLeaveCriticalSection( &dlldir_section );
  80     return len;
  81 }
  82
  83
  84 /****************************************************************************
  85  *              GetDllDirectoryW   (KERNEL32.@)
  86  */
  87 DWORD WINAPI GetDllDirectoryW( DWORD buf_len, LPWSTR buffer )
  88 {
  89     DWORD len;
  90
  91     RtlEnterCriticalSection( &dlldir_section );
  92     len = dll_directory ? strlenW( dll_directory ) : 0;
  93     if (buffer && buf_len > len)
  94     {
  95         if (dll_directory) memcpy( buffer, dll_directory, (len + 1) * sizeof(WCHAR) );
  96         else *buffer = 0;
  97     }
  98     else
  99     {
 100         len++;  /* for terminating null */
 101         if (buffer) *buffer = 0;
 102     }
 103     RtlLeaveCriticalSection( &dlldir_section );
 104     return len;
 105 }
 106
 107
 108 /****************************************************************************
 109  *              SetDllDirectoryA   (KERNEL32.@)
 110  */
 111 BOOL WINAPI SetDllDirectoryA( LPCSTR dir )
 112 {
 113     WCHAR *dirW;
 114     BOOL ret;
 115
 116     if (!(dirW = FILE_name_AtoW( dir, TRUE ))) return FALSE;
 117     ret = SetDllDirectoryW( dirW );
 118     HeapFree( GetProcessHeap(), 0, dirW );
 119     return ret;
 120 }
 121
 122
 123 /****************************************************************************
 124  *              SetDllDirectoryW   (KERNEL32.@)
 125  */
 126 BOOL WINAPI SetDllDirectoryW( LPCWSTR dir )
 127 {
 128     WCHAR *newdir = NULL;
 129
 130     if (dir)
 131     {
 132         DWORD len = (strlenW(dir) + 1) * sizeof(WCHAR);
 133         if (!(newdir = HeapAlloc( GetProcessHeap(), 0, len )))
 134         {
 135             SetLastError( ERROR_NOT_ENOUGH_MEMORY );
 136             return FALSE;
 137         }
 138         memcpy( newdir, dir, len );
 139     }
 140
 141     RtlEnterCriticalSection( &dlldir_section );
 142     HeapFree( GetProcessHeap(), 0, dll_directory );
 143     dll_directory = newdir;
 144     RtlLeaveCriticalSection( &dlldir_section );
 145     return TRUE;
 146 }
 147
 148
 149 /****************************************************************************
 150  *              DisableThreadLibraryCalls (KERNEL32.@)
 151  *
 152  * Inform the module loader that thread notifications are not required for a dll.
 153  *
 154  * PARAMS
 155  *  hModule [I] Module handle to skip calls for
 156  *
 157  * RETURNS
 158  *  Success: TRUE. Thread attach and detach notifications will not be sent
 159  *           to hModule.
 160  *  Failure: FALSE. Use GetLastError() to determine the cause.
 161  *
 162  * NOTES
 163  *  This is typically called from the dll entry point of a dll during process
 164  *  attachment, for dlls that do not need to process thread notifications.
 165  */
 166 BOOL WINAPI DisableThreadLibraryCalls( HMODULE hModule )
 167 {
 168     NTSTATUS    nts = LdrDisableThreadCalloutsForDll( hModule );
 169     if (nts == STATUS_SUCCESS) return TRUE;
 170
 171     SetLastError( RtlNtStatusToDosError( nts ) );
 172     return FALSE;
 173 }
 174
 175
 176 /* Check whether a file is an OS/2 or a very old Windows executable
 177  * by testing on import of KERNEL.
 178  *
 179  * FIXME: is reading the module imports the only way of discerning
 180  *        old Windows binaries from OS/2 ones ? At least it seems so...
 181  */
 182 static enum binary_type MODULE_Decide_OS2_OldWin(HANDLE hfile, const IMAGE_DOS_HEADER *mz,
 183                                                  const IMAGE_OS2_HEADER *ne)
 184 {
 185     DWORD currpos = SetFilePointer( hfile, 0, NULL, SEEK_CUR);
 186     enum binary_type ret = BINARY_OS216;
 187     LPWORD modtab = NULL;
 188     LPSTR nametab = NULL;
 189     DWORD len;
 190     int i;
 191
 192     /* read modref table */
 193     if ( (SetFilePointer( hfile, mz->e_lfanew + ne->ne_modtab, NULL, SEEK_SET ) == -1)
 194       || (!(modtab = HeapAlloc( GetProcessHeap(), 0, ne->ne_cmod*sizeof(WORD))))
 195       || (!(ReadFile(hfile, modtab, ne->ne_cmod*sizeof(WORD), &len, NULL)))
 196       || (len != ne->ne_cmod*sizeof(WORD)) )
 197         goto broken;
 198
 199     /* read imported names table */
 200     if ( (SetFilePointer( hfile, mz->e_lfanew + ne->ne_imptab, NULL, SEEK_SET ) == -1)
 201       || (!(nametab = HeapAlloc( GetProcessHeap(), 0, ne->ne_enttab - ne->ne_imptab)))
 202       || (!(ReadFile(hfile, nametab, ne->ne_enttab - ne->ne_imptab, &len, NULL)))
 203       || (len != ne->ne_enttab - ne->ne_imptab) )
 204         goto broken;
 205
 206     for (i=0; i < ne->ne_cmod; i++)
 207     {
 208         LPSTR module = &nametab[modtab[i]];
 209         TRACE("modref: %.*s\n", module[0], &module[1]);
 210         if (!(strncmp(&module[1], "KERNEL", module[0])))
 211         { /* very old Windows file */
 212             MESSAGE("This seems to be a very old (pre-3.0) Windows executable. Expect crashes, especially if this is a real-mode binary !\n");
 213             ret = BINARY_WIN16;
 214             goto good;
 215         }
 216     }
 217
 218 broken:
 219     ERR("Hmm, an error occurred. Is this binary file broken?\n");
 220
 221 good:
 222     HeapFree( GetProcessHeap(), 0, modtab);
 223     HeapFree( GetProcessHeap(), 0, nametab);
 224     SetFilePointer( hfile, currpos, NULL, SEEK_SET); /* restore filepos */
 225     return ret;
 226 }
 227
 228 /***********************************************************************
 229  *           MODULE_GetBinaryType
 230  */
 231 enum binary_type MODULE_GetBinaryType( HANDLE hfile, void **res_start, void **res_end )
 232 {
 233     union
 234     {
 235         struct
 236         {
 237             unsigned char magic[4];
 238             unsigned char ignored[12];
 239             unsigned short type;
 240         } elf;
 241         struct
 242         {
 243             unsigned long magic;
 244             unsigned long cputype;
 245             unsigned long cpusubtype;
 246             unsigned long filetype;
 247         } macho;
 248         IMAGE_DOS_HEADER mz;
 249     } header;
 250
 251     DWORD len;
 252
 253     /* Seek to the start of the file and read the header information. */
 254     if (SetFilePointer( hfile, 0, NULL, SEEK_SET ) == -1)
 255         return BINARY_UNKNOWN;
 256     if (!ReadFile( hfile, &header, sizeof(header), &len, NULL ) || len != sizeof(header))
 257         return BINARY_UNKNOWN;
 258
 259     if (!memcmp( header.elf.magic, "\177ELF", 4 ))
 260     {
 261         /* FIXME: we don't bother to check byte order, architecture, etc. */
 262         switch(header.elf.type)
 263         {
 264         case 2: return BINARY_UNIX_EXE;
 265         case 3: return BINARY_UNIX_LIB;
 266         }
 267         return BINARY_UNKNOWN;
 268     }
 269
 270     /* Mach-o File with Endian set to Big Endian or Little Endian */
 271     if (header.macho.magic == 0xfeedface || header.macho.magic == 0xcefaedfe)
 272     {
 273         switch(header.macho.filetype)
 274         {
 275             case 0x8: /* MH_BUNDLE */ return BINARY_UNIX_LIB;
 276         }
 277         return BINARY_UNKNOWN;
 278     }
 279
 280     /* Not ELF, try DOS */
 281
 282     if (header.mz.e_magic == IMAGE_DOS_SIGNATURE)
 283     {
 284         union
 285         {
 286             IMAGE_OS2_HEADER os2;
 287             IMAGE_NT_HEADERS nt;
 288         } ext_header;
 289
 290         /* We do have a DOS image so we will now try to seek into
 291          * the file by the amount indicated by the field
 292          * "Offset to extended header" and read in the
 293          * "magic" field information at that location.
 294          * This will tell us if there is more header information
 295          * to read or not.
 296          */
 297         if (SetFilePointer( hfile, header.mz.e_lfanew, NULL, SEEK_SET ) == -1)
 298             return BINARY_DOS;
 299         if (!ReadFile( hfile, &ext_header, sizeof(ext_header), &len, NULL ) || len < 4)
 300             return BINARY_DOS;
 301
 302         /* Reading the magic field succeeded so
 303          * we will try to determine what type it is.
 304          */
 305         if (!memcmp( &ext_header.nt.Signature, "PE\0\0", 4 ))
 306         {
 307             if (len >= sizeof(ext_header.nt.FileHeader))
 308             {
 309                 if (len < sizeof(ext_header.nt))  /* clear remaining part of header if missing */
 310                     memset( (char *)&ext_header.nt + len, 0, sizeof(ext_header.nt) - len );
 311                 if (res_start) *res_start = (void *)ext_header.nt.OptionalHeader.ImageBase;
 312                 if (res_end) *res_end = (void *)(ext_header.nt.OptionalHeader.ImageBase +
 313                                                  ext_header.nt.OptionalHeader.SizeOfImage);
 314                 if (ext_header.nt.FileHeader.Characteristics & IMAGE_FILE_DLL) return BINARY_PE_DLL;
 315                 return BINARY_PE_EXE;
 316             }
 317             return BINARY_DOS;
 318         }
 319
 320         if (!memcmp( &ext_header.os2.ne_magic, "NE", 2 ))
 321         {
 322             /* This is a Windows executable (NE) header.  This can
 323              * mean either a 16-bit OS/2 or a 16-bit Windows or even a
 324              * DOS program (running under a DOS extender).  To decide
 325              * which, we'll have to read the NE header.
 326              */
 327             if (len >= sizeof(ext_header.os2))
 328             {
 329                 switch ( ext_header.os2.ne_exetyp )
 330                 {
 331                 case 1:  return BINARY_OS216; /* OS/2 */
 332                 case 2:  return BINARY_WIN16; /* Windows */
 333                 case 3:  return BINARY_DOS; /* European MS-DOS 4.x */
 334                 case 4:  return BINARY_WIN16; /* Windows 386; FIXME: is this 32bit??? */
 335                 case 5:  return BINARY_DOS; /* BOSS, Borland Operating System Services */
 336                 /* other types, e.g. 0 is: "unknown" */
 337                 default: return MODULE_Decide_OS2_OldWin(hfile, &header.mz, &ext_header.os2);
 338                 }
 339             }
 340             /* Couldn't read header, so abort. */
 341             return BINARY_DOS;
 342         }
 343
 344         /* Unknown extended header, but this file is nonetheless DOS-executable. */
 345         return BINARY_DOS;
 346     }
 347
 348     return BINARY_UNKNOWN;
 349 }
 350
 351 /***********************************************************************
 352  *             GetBinaryTypeW                     [KERNEL32.@]
 353  *
 354  * Determine whether a file is executable, and if so, what kind.
 355  *
 356  * PARAMS
 357  *  lpApplicationName [I] Path of the file to check
 358  *  lpBinaryType      [O] Destination for the binary type
 359  *
 360  * RETURNS
 361  *  TRUE, if the file is an executable, in which case lpBinaryType is set.
 362  *  FALSE, if the file is not an executable or if the function fails.
 363  *
 364  * NOTES
 365  *  The type of executable is a property that determines which subsytem an
 366  *  executable file runs under. lpBinaryType can be set to one of the following
 367  *  values:
 368  *   SCS_32BIT_BINARY: A Win32 based application
 369  *   SCS_DOS_BINARY: An MS-Dos based application
 370  *   SCS_WOW_BINARY: A Win16 based application
 371  *   SCS_PIF_BINARY: A PIF file that executes an MS-Dos based app
 372  *   SCS_POSIX_BINARY: A POSIX based application ( Not implemented )
 373  *   SCS_OS216_BINARY: A 16bit OS/2 based application
 374  *
 375  *  To find the binary type, this function reads in the files header information.
 376  *  If extended header information is not present it will assume that the file
 377  *  is a DOS executable. If extended header information is present it will
 378  *  determine if the file is a 16 or 32 bit Windows executable by checking the
 379  *  flags in the header.
 380  *
 381  *  ".com" and ".pif" files are only recognized by their file name extension,
 382  *  as per native Windows.
 383  */
 384 BOOL WINAPI GetBinaryTypeW( LPCWSTR lpApplicationName, LPDWORD lpBinaryType )
 385 {
 386     BOOL ret = FALSE;
 387     HANDLE hfile;
 388
 389     TRACE("%s\n", debugstr_w(lpApplicationName) );
 390
 391     /* Sanity check.
 392      */
 393     if ( lpApplicationName == NULL || lpBinaryType == NULL )
 394         return FALSE;
 395
 396     /* Open the file indicated by lpApplicationName for reading.
 397      */
 398     hfile = CreateFileW( lpApplicationName, GENERIC_READ, FILE_SHARE_READ,
 399                          NULL, OPEN_EXISTING, 0, 0 );
 400     if ( hfile == INVALID_HANDLE_VALUE )
 401         return FALSE;
 402
 403     /* Check binary type
 404      */
 405     switch(MODULE_GetBinaryType( hfile, NULL, NULL ))
 406     {
 407     case BINARY_UNKNOWN:
 408     {
 409         static const WCHAR comW[] = { '.','C','O','M',0 };
 410         static const WCHAR pifW[] = { '.','P','I','F',0 };
 411         const WCHAR *ptr;
 412
 413         /* try to determine from file name */
 414         ptr = strrchrW( lpApplicationName, '.' );
 415         if (!ptr) break;
 416         if (!strcmpiW( ptr, comW ))
 417         {
 418             *lpBinaryType = SCS_DOS_BINARY;
 419             ret = TRUE;
 420         }
 421         else if (!strcmpiW( ptr, pifW ))
 422         {
 423             *lpBinaryType = SCS_PIF_BINARY;
 424             ret = TRUE;
 425         }
 426         break;
 427     }
 428     case BINARY_PE_EXE:
 429     case BINARY_PE_DLL:
 430         *lpBinaryType = SCS_32BIT_BINARY;
 431         ret = TRUE;
 432         break;
 433     case BINARY_WIN16:
 434         *lpBinaryType = SCS_WOW_BINARY;
 435         ret = TRUE;
 436         break;
 437     case BINARY_OS216:
 438         *lpBinaryType = SCS_OS216_BINARY;
 439         ret = TRUE;
 440         break;
 441     case BINARY_DOS:
 442         *lpBinaryType = SCS_DOS_BINARY;
 443         ret = TRUE;
 444         break;
 445     case BINARY_UNIX_EXE:
 446     case BINARY_UNIX_LIB:
 447         ret = FALSE;
 448         break;
 449     }
 450
 451     CloseHandle( hfile );
 452     return ret;
 453 }
 454
 455 /***********************************************************************
 456  *             GetBinaryTypeA                     [KERNEL32.@]
 457  *             GetBinaryType                      [KERNEL32.@]
 458  *
 459  * See GetBinaryTypeW.
 460  */
 461 BOOL WINAPI GetBinaryTypeA( LPCSTR lpApplicationName, LPDWORD lpBinaryType )
 462 {
 463     ANSI_STRING app_nameA;
 464     NTSTATUS status;
 465
 466     TRACE("%s\n", debugstr_a(lpApplicationName));
 467
 468     /* Sanity check.
 469      */
 470     if ( lpApplicationName == NULL || lpBinaryType == NULL )
 471         return FALSE;
 472
 473     RtlInitAnsiString(&app_nameA, lpApplicationName);
 474     status = RtlAnsiStringToUnicodeString(&NtCurrentTeb()->StaticUnicodeString,
 475                                           &app_nameA, FALSE);
 476     if (!status)
 477         return GetBinaryTypeW(NtCurrentTeb()->StaticUnicodeString.Buffer, lpBinaryType);
 478
 479     SetLastError(RtlNtStatusToDosError(status));
 480     return FALSE;
 481 }
 482
 483
 484 /***********************************************************************
 485  *              GetModuleHandleA         (KERNEL32.@)
 486  *              GetModuleHandle32        (KERNEL.488)
 487  *
 488  * Get the handle of a dll loaded into the process address space.
 489  *
 490  * PARAMS
 491  *  module [I] Name of the dll
 492  *
 493  * RETURNS
 494  *  Success: A handle to the loaded dll.
 495  *  Failure: A NULL handle. Use GetLastError() to determine the cause.
 496  */
 497 HMODULE WINAPI GetModuleHandleA(LPCSTR module)
 498 {
 499     WCHAR *moduleW;
 500
 501     if (!module) return NtCurrentTeb()->Peb->ImageBaseAddress;
 502     if (!(moduleW = FILE_name_AtoW( module, FALSE ))) return 0;
 503     return GetModuleHandleW( moduleW );
 504 }
 505
 506 /***********************************************************************
 507  *              GetModuleHandleW (KERNEL32.@)
 508  *
 509  * Unicode version of GetModuleHandleA.
 510  */
 511 HMODULE WINAPI GetModuleHandleW(LPCWSTR module)
 512 {
 513     NTSTATUS            nts;
 514     HMODULE             ret;
 515     UNICODE_STRING      wstr;
 516
 517     if (!module) return NtCurrentTeb()->Peb->ImageBaseAddress;
 518
 519     RtlInitUnicodeString( &wstr, module );
 520     nts = LdrGetDllHandle( 0, 0, &wstr, &ret);
 521     if (nts != STATUS_SUCCESS)
 522     {
 523         SetLastError( RtlNtStatusToDosError( nts ) );
 524         ret = 0;
 525     }
 526     return ret;
 527 }
 528
 529
 530 /***********************************************************************
 531  *              GetModuleFileNameA      (KERNEL32.@)
 532  *              GetModuleFileName32     (KERNEL.487)
 533  *
 534  * Get the file name of a loaded module from its handle.
 535  *
 536  * RETURNS
 537  *  Success: The length of the file name, excluding the terminating NUL.
 538  *  Failure: 0. Use GetLastError() to determine the cause.
 539  *
 540  * NOTES
 541  *  This function always returns the long path of hModule (as opposed to
 542  *  GetModuleFileName16() which returns short paths when the modules version
 543  *  field is < 4.0).
 544  *  The function doesn't write a terminating '\0' if the buffer is too
 545  *  small.
 546  */
 547 DWORD WINAPI GetModuleFileNameA(
 548         HMODULE hModule,        /* [in] Module handle (32 bit) */
 549         LPSTR lpFileName,       /* [out] Destination for file name */
 550         DWORD size )            /* [in] Size of lpFileName in characters */
 551 {
 552     LPWSTR filenameW = HeapAlloc( GetProcessHeap(), 0, size * sizeof(WCHAR) );
 553     DWORD len;
 554
 555     if (!filenameW)
 556     {
 557         SetLastError( ERROR_NOT_ENOUGH_MEMORY );
 558         return 0;
 559     }
 560     if ((len = GetModuleFileNameW( hModule, filenameW, size )))
 561     {
 562         len = FILE_name_WtoA( filenameW, len, lpFileName, size );
 563         if (len < size) lpFileName[len] = '\0';
 564     }
 565     HeapFree( GetProcessHeap(), 0, filenameW );
 566     return len;
 567 }
 568
 569 /***********************************************************************
 570  *              GetModuleFileNameW      (KERNEL32.@)
 571  *
 572  * Unicode version of GetModuleFileNameA.
 573  */
 574 DWORD WINAPI GetModuleFileNameW( HMODULE hModule, LPWSTR lpFileName, DWORD size )
 575 {
 576     ULONG magic, len = 0;
 577     LDR_MODULE *pldr;
 578     NTSTATUS nts;
 579     WIN16_SUBSYSTEM_TIB *win16_tib;
 580
 581     if (!hModule && ((win16_tib = NtCurrentTeb()->Tib.SubSystemTib)) && win16_tib->exe_name)
 582     {
 583         len = min(size, win16_tib->exe_name->Length / sizeof(WCHAR));
 584         memcpy( lpFileName, win16_tib->exe_name->Buffer, len * sizeof(WCHAR) );
 585         if (len < size) lpFileName[len] = '\0';
 586         goto done;
 587     }
 588
 589     LdrLockLoaderLock( 0, NULL, &magic );
 590
 591     if (!hModule) hModule = NtCurrentTeb()->Peb->ImageBaseAddress;
 592     nts = LdrFindEntryForAddress( hModule, &pldr );
 593     if (nts == STATUS_SUCCESS)
 594     {
 595         len = min(size, pldr->FullDllName.Length / sizeof(WCHAR));
 596         memcpy(lpFileName, pldr->FullDllName.Buffer, len * sizeof(WCHAR));
 597         if (len < size) lpFileName[len] = '\0';
 598     }
 599     else SetLastError( RtlNtStatusToDosError( nts ) );
 600
 601     LdrUnlockLoaderLock( 0, magic );
 602 done:
 603     TRACE( "%s\n", debugstr_wn(lpFileName, len) );
 604     return len;
 605 }
 606
 607
 608 /***********************************************************************
 609  *           get_dll_system_path
 610  */
 611 static const WCHAR *get_dll_system_path(void)
 612 {
 613     static WCHAR *cached_path;
 614
 615     if (!cached_path)
 616     {
 617         WCHAR *p, *path;
 618         int len = 3;
 619
 620         len += 2 * GetSystemDirectoryW( NULL, 0 );
 621         len += GetWindowsDirectoryW( NULL, 0 );
 622         p = path = HeapAlloc( GetProcessHeap(), 0, len * sizeof(WCHAR) );
 623         *p++ = '.';
 624         *p++ = ';';
 625         GetSystemDirectoryW( p, path + len - p);
 626         p += strlenW(p);
 627         /* if system directory ends in "32" add 16-bit version too */
 628         if (p[-2] == '3' && p[-1] == '2')
 629         {
 630             *p++ = ';';
 631             GetSystemDirectoryW( p, path + len - p);
 632             p += strlenW(p) - 2;
 633         }
 634         *p++ = ';';
 635         GetWindowsDirectoryW( p, path + len - p);
 636         cached_path = path;
 637     }
 638     return cached_path;
 639 }
 640
 641
 642 /******************************************************************
 643  *              MODULE_get_dll_load_path
 644  *
 645  * Compute the load path to use for a given dll.
 646  * Returned pointer must be freed by caller.
 647  */
 648 WCHAR *MODULE_get_dll_load_path( LPCWSTR module )
 649 {
 650     static const WCHAR pathW[] = {'P','A','T','H',0};
 651
 652     const WCHAR *system_path = get_dll_system_path();
 653     const WCHAR *mod_end = NULL;
 654     UNICODE_STRING name, value;
 655     WCHAR *p, *ret;
 656     int len = 0, path_len = 0;
 657
 658     /* adjust length for module name */
 659
 660     if (!module) module = NtCurrentTeb()->Peb->ProcessParameters->ImagePathName.Buffer;
 661     if (module)
 662     {
 663         mod_end = module;
 664         if ((p = strrchrW( mod_end, '\\' ))) mod_end = p;
 665         if ((p = strrchrW( mod_end, '/' ))) mod_end = p;
 666         if (mod_end == module + 2 && module[1] == ':') mod_end++;
 667         if (mod_end == module && module[0] && module[1] == ':') mod_end += 2;
 668         len += (mod_end - module) + 1;
 669     }
 670     len += strlenW( system_path ) + 2;
 671
 672     /* get the PATH variable */
 673
 674     RtlInitUnicodeString( &name, pathW );
 675     value.Length = 0;
 676     value.MaximumLength = 0;
 677     value.Buffer = NULL;
 678     if (RtlQueryEnvironmentVariable_U( NULL, &name, &value ) == STATUS_BUFFER_TOO_SMALL)
 679         path_len = value.Length;
 680
 681     RtlEnterCriticalSection( &dlldir_section );
 682     if (dll_directory) len += strlenW(dll_directory) + 1;
 683     if ((p = ret = HeapAlloc( GetProcessHeap(), 0, path_len + len * sizeof(WCHAR) )))
 684     {
 685         if (module)
 686         {
 687             memcpy( ret, module, (mod_end - module) * sizeof(WCHAR) );
 688             p += (mod_end - module);
 689             *p++ = ';';
 690         }
 691         if (dll_directory)
 692         {
 693             strcpyW( p, dll_directory );
 694             p += strlenW(p);
 695             *p++ = ';';
 696         }
 697     }
 698     RtlLeaveCriticalSection( &dlldir_section );
 699     if (!ret) return NULL;
 700
 701     strcpyW( p, system_path );
 702     p += strlenW(p);
 703     *p++ = ';';
 704     value.Buffer = p;
 705     value.MaximumLength = path_len;
 706
 707     while (RtlQueryEnvironmentVariable_U( NULL, &name, &value ) == STATUS_BUFFER_TOO_SMALL)
 708     {
 709         WCHAR *new_ptr;
 710
 711         /* grow the buffer and retry */
 712         path_len = value.Length;
 713         if (!(new_ptr = HeapReAlloc( GetProcessHeap(), 0, ret, path_len + len * sizeof(WCHAR) )))
 714         {
 715             HeapFree( GetProcessHeap(), 0, ret );
 716             return NULL;
 717         }
 718         value.Buffer = new_ptr + (value.Buffer - ret);
 719         value.MaximumLength = path_len;
 720         ret = new_ptr;
 721     }
 722     value.Buffer[value.Length / sizeof(WCHAR)] = 0;
 723     return ret;
 724 }
 725
 726
 727 /******************************************************************
 728  *              load_library_as_datafile
 729  */
 730 static BOOL load_library_as_datafile( LPCWSTR name, HMODULE* hmod)
 731 {
 732     static const WCHAR dotDLL[] = {'.','d','l','l',0};
 733
 734     WCHAR filenameW[MAX_PATH];
 735     HANDLE hFile = INVALID_HANDLE_VALUE;
 736     HANDLE mapping;
 737     HMODULE module;
 738
 739     *hmod = 0;
 740
 741     if (SearchPathW( NULL, (LPCWSTR)name, dotDLL, sizeof(filenameW) / sizeof(filenameW[0]),
 742                      filenameW, NULL ))
 743     {
 744         hFile = CreateFileW( filenameW, GENERIC_READ, FILE_SHARE_READ,
 745                              NULL, OPEN_EXISTING, 0, 0 );
 746     }
 747     if (hFile == INVALID_HANDLE_VALUE) return FALSE;
 748
 749     mapping = CreateFileMappingW( hFile, NULL, PAGE_READONLY, 0, 0, NULL );
 750     CloseHandle( hFile );
 751     if (!mapping) return FALSE;
 752
 753     module = MapViewOfFile( mapping, FILE_MAP_READ, 0, 0, 0 );
 754     CloseHandle( mapping );
 755     if (!module) return FALSE;
 756
 757     /* make sure it's a valid PE file */
 758     if (!RtlImageNtHeader(module))
 759     {
 760         UnmapViewOfFile( module );
 761         return FALSE;
 762     }
 763     *hmod = (HMODULE)((char *)module + 1);  /* set low bit of handle to indicate datafile module */
 764     return TRUE;
 765 }
 766
 767
 768 /******************************************************************
 769  *              load_library
 770  *
 771  * Helper for LoadLibraryExA/W.
 772  */
 773 static HMODULE load_library( const UNICODE_STRING *libname, DWORD flags )
 774 {
 775     NTSTATUS nts;
 776     HMODULE hModule;
 777     WCHAR *load_path;
 778
 779     if (flags & LOAD_LIBRARY_AS_DATAFILE)
 780     {
 781         /* The method in load_library_as_datafile allows searching for the
 782          * 'native' libraries only
 783          */
 784         if (load_library_as_datafile( libname->Buffer, &hModule )) return hModule;
 785         flags |= DONT_RESOLVE_DLL_REFERENCES; /* Just in case */
 786         /* Fallback to normal behaviour */
 787     }
 788
 789     load_path = MODULE_get_dll_load_path( flags & LOAD_WITH_ALTERED_SEARCH_PATH ? libname->Buffer : NULL );
 790     nts = LdrLoadDll( load_path, flags, libname, &hModule );
 791     HeapFree( GetProcessHeap(), 0, load_path );
 792     if (nts != STATUS_SUCCESS)
 793     {
 794         hModule = 0;
 795         SetLastError( RtlNtStatusToDosError( nts ) );
 796     }
 797     return hModule;
 798 }
 799
 800
 801 /******************************************************************
 802  *              LoadLibraryExA          (KERNEL32.@)
 803  *
 804  * Load a dll file into the process address space.
 805  *
 806  * PARAMS
 807  *  libname [I] Name of the file to load
 808  *  hfile   [I] Reserved, must be 0.
 809  *  flags   [I] Flags for loading the dll
 810  *
 811  * RETURNS
 812  *  Success: A handle to the loaded dll.
 813  *  Failure: A NULL handle. Use GetLastError() to determine the cause.
 814  *
 815  * NOTES
 816  * The HFILE parameter is not used and marked reserved in the SDK. I can
 817  * only guess that it should force a file to be mapped, but I rather
 818  * ignore the parameter because it would be extremely difficult to
 819  * integrate this with different types of module representations.
 820  */
 821 HMODULE WINAPI LoadLibraryExA(LPCSTR libname, HANDLE hfile, DWORD flags)
 822 {
 823     WCHAR *libnameW;
 824
 825     if (!(libnameW = FILE_name_AtoW( libname, FALSE ))) return 0;
 826     return LoadLibraryExW( libnameW, hfile, flags );
 827 }
 828
 829 /***********************************************************************
 830  *           LoadLibraryExW       (KERNEL32.@)
 831  *
 832  * Unicode version of LoadLibraryExA.
 833  */
 834 HMODULE WINAPI LoadLibraryExW(LPCWSTR libnameW, HANDLE hfile, DWORD flags)
 835 {
 836     UNICODE_STRING      wstr;
 837     HMODULE             res;
 838
 839     if (!libnameW)
 840     {
 841         SetLastError(ERROR_INVALID_PARAMETER);
 842         return 0;
 843     }
 844     RtlInitUnicodeString( &wstr, libnameW );
 845     if (wstr.Buffer[wstr.Length/sizeof(WCHAR) - 1] != ' ')
 846         return load_library( &wstr, flags );
 847
 848     /* Library name has trailing spaces */
 849     RtlCreateUnicodeString( &wstr, libnameW );
 850     while (wstr.Length > sizeof(WCHAR) &&
 851            wstr.Buffer[wstr.Length/sizeof(WCHAR) - 1] == ' ')
 852     {
 853         wstr.Length -= sizeof(WCHAR);
 854     }
 855     wstr.Buffer[wstr.Length/sizeof(WCHAR)] = '\0';
 856     res = load_library( &wstr, flags );
 857     RtlFreeUnicodeString( &wstr );
 858     return res;
 859 }
 860
 861 /***********************************************************************
 862  *           LoadLibraryA         (KERNEL32.@)
 863  *
 864  * Load a dll file into the process address space.
 865  *
 866  * PARAMS
 867  *  libname [I] Name of the file to load
 868  *
 869  * RETURNS
 870  *  Success: A handle to the loaded dll.
 871  *  Failure: A NULL handle. Use GetLastError() to determine the cause.
 872  *
 873  * NOTES
 874  * See LoadLibraryExA().
 875  */
 876 HMODULE WINAPI LoadLibraryA(LPCSTR libname)
 877 {
 878     return LoadLibraryExA(libname, 0, 0);
 879 }
 880
 881 /***********************************************************************
 882  *           LoadLibraryW         (KERNEL32.@)
 883  *
 884  * Unicode version of LoadLibraryA.
 885  */
 886 HMODULE WINAPI LoadLibraryW(LPCWSTR libnameW)
 887 {
 888     return LoadLibraryExW(libnameW, 0, 0);
 889 }
 890
 891 /***********************************************************************
 892  *           FreeLibrary   (KERNEL32.@)
 893  *           FreeLibrary32 (KERNEL.486)
 894  *
 895  * Free a dll loaded into the process address space.
 896  *
 897  * PARAMS
 898  *  hLibModule [I] Handle to the dll returned by LoadLibraryA().
 899  *
 900  * RETURNS
 901  *  Success: TRUE. The dll is removed if it is not still in use.
 902  *  Failure: FALSE. Use GetLastError() to determine the cause.
 903  */
 904 BOOL WINAPI FreeLibrary(HINSTANCE hLibModule)
 905 {
 906     BOOL                retv = FALSE;
 907     NTSTATUS            nts;
 908
 909     if (!hLibModule)
 910     {
 911         SetLastError( ERROR_INVALID_HANDLE );
 912         return FALSE;
 913     }
 914
 915     if ((ULONG_PTR)hLibModule & 1)
 916     {
 917         /* this is a LOAD_LIBRARY_AS_DATAFILE module */
 918         char *ptr = (char *)hLibModule - 1;
 919         UnmapViewOfFile( ptr );
 920         return TRUE;
 921     }
 922
 923     if ((nts = LdrUnloadDll( hLibModule )) == STATUS_SUCCESS) retv = TRUE;
 924     else SetLastError( RtlNtStatusToDosError( nts ) );
 925
 926     return retv;
 927 }
 928
 929 /***********************************************************************
 930  *           GetProcAddress             (KERNEL32.@)
 931  *
 932  * Find the address of an exported symbol in a loaded dll.
 933  *
 934  * PARAMS
 935  *  hModule  [I] Handle to the dll returned by LoadLibraryA().
 936  *  function [I] Name of the symbol, or an integer ordinal number < 16384
 937  *
 938  * RETURNS
 939  *  Success: A pointer to the symbol in the process address space.
 940  *  Failure: NULL. Use GetLastError() to determine the cause.
 941  */
 942 FARPROC WINAPI GetProcAddress( HMODULE hModule, LPCSTR function )
 943 {
 944     NTSTATUS    nts;
 945     FARPROC     fp;
 946
 947     if (!hModule) hModule = NtCurrentTeb()->Peb->ImageBaseAddress;
 948
 949     if (HIWORD(function))
 950     {
 951         ANSI_STRING     str;
 952
 953         RtlInitAnsiString( &str, function );
 954         nts = LdrGetProcedureAddress( hModule, &str, 0, (void**)&fp );
 955     }
 956     else
 957         nts = LdrGetProcedureAddress( hModule, NULL, LOWORD(function), (void**)&fp );
 958     if (nts != STATUS_SUCCESS)
 959     {
 960         SetLastError( RtlNtStatusToDosError( nts ) );
 961         fp = NULL;
 962     }
 963     return fp;
 964 }
 965
 966 /***********************************************************************
 967  *           GetProcAddress32                   (KERNEL.453)
 968  *
 969  * Find the address of an exported symbol in a loaded dll.
 970  *
 971  * PARAMS
 972  *  hModule  [I] Handle to the dll returned by LoadLibraryA().
 973  *  function [I] Name of the symbol, or an integer ordinal number < 16384
 974  *
 975  * RETURNS
 976  *  Success: A pointer to the symbol in the process address space.
 977  *  Failure: NULL. Use GetLastError() to determine the cause.
 978  */
 979 FARPROC WINAPI GetProcAddress32_16( HMODULE hModule, LPCSTR function )
 980 {
 981     /* FIXME: we used to disable snoop when returning proc for Win16 subsystem */
 982     return GetProcAddress( hModule, function );
 983 }
 984
 985
 986 /***********************************************************************
 987  *           DelayLoadFailureHook  (KERNEL32.@)
 988  */
 989 FARPROC WINAPI DelayLoadFailureHook( LPCSTR name, LPCSTR function )
 990 {
 991     ULONG_PTR args[2];
 992
 993     if ((ULONG_PTR)function >> 16)
 994         ERR( "failed to delay load %s.%s\n", name, function );
 995     else
 996         ERR( "failed to delay load %s.%u\n", name, LOWORD(function) );
 997     args[0] = (ULONG_PTR)name;
 998     args[1] = (ULONG_PTR)function;
 999     RaiseException( EXCEPTION_WINE_STUB, EH_NONCONTINUABLE, 2, args );
1000     return NULL;
1001 }