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