libs/wine/loader.c

   1 /*
   2  * Win32 builtin dlls support
   3  *
   4  * Copyright 2000 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  19  */
  20
  21 #include "config.h"
  22 #include "wine/port.h"
  23
  24 #include <assert.h>
  25 #include <ctype.h>
  26 #include <fcntl.h>
  27 #include <limits.h>
  28 #include <stdarg.h>
  29 #include <stdlib.h>
  30 #include <string.h>
  31 #include <sys/types.h>
  32 #ifdef HAVE_SYS_MMAN_H
  33 #include <sys/mman.h>
  34 #endif
  35 #ifdef HAVE_SYS_RESOURCE_H
  36 # include <sys/resource.h>
  37 #endif
  38 #ifdef HAVE_UNISTD_H
  39 # include <unistd.h>
  40 #endif
  41
  42 #define NONAMELESSUNION
  43 #define NONAMELESSSTRUCT
  44 #include "windef.h"
  45 #include "winbase.h"
  46 #include "wine/library.h"
  47
  48 #ifdef __APPLE__
  49 #include <crt_externs.h>
  50 #define environ (*_NSGetEnviron())
  51 #include <CoreFoundation/CoreFoundation.h>
  52 #include <pthread.h>
  53 #else
  54 extern char **environ;
  55 #endif
  56
  57 /* argc/argv for the Windows application */
  58 int __wine_main_argc = 0;
  59 char **__wine_main_argv = NULL;
  60 WCHAR **__wine_main_wargv = NULL;
  61 char **__wine_main_environ = NULL;
  62
  63 struct dll_path_context
  64 {
  65     unsigned int index; /* current index in the dll path list */
  66     char *buffer;       /* buffer used for storing path names */
  67     char *name;         /* start of file name part in buffer (including leading slash) */
  68     int   namelen;      /* length of file name without .so extension */
  69     int   win16;        /* 16-bit dll search */
  70 };
  71
  72 #define MAX_DLLS 100
  73
  74 static struct
  75 {
  76     const IMAGE_NT_HEADERS *nt;           /* NT header */
  77     const char             *filename;     /* DLL file name */
  78 } builtin_dlls[MAX_DLLS];
  79
  80 static int nb_dlls;
  81
  82 static const IMAGE_NT_HEADERS *main_exe;
  83
  84 static load_dll_callback_t load_dll_callback;
  85
  86 static const char *build_dir;
  87 static const char *default_dlldir;
  88 static const char **dll_paths;
  89 static unsigned int nb_dll_paths;
  90 static int dll_path_maxlen;
  91
  92 extern void mmap_init(void);
  93 extern const char *get_dlldir( const char **default_dlldir );
  94
  95 /* build the dll load path from the WINEDLLPATH variable */
  96 static void build_dll_path(void)
  97 {
  98     int len, count = 0;
  99     char *p, *path = getenv( "WINEDLLPATH" );
 100     const char *dlldir = get_dlldir( &default_dlldir );
 101
 102     if (path)
 103     {
 104         /* count how many path elements we need */
 105         path = strdup(path);
 106         p = path;
 107         while (*p)
 108         {
 109             while (*p == ':') p++;
 110             if (!*p) break;
 111             count++;
 112             while (*p && *p != ':') p++;
 113         }
 114     }
 115
 116     dll_paths = malloc( (count+2) * sizeof(*dll_paths) );
 117     nb_dll_paths = 0;
 118
 119     if (dlldir)
 120     {
 121         dll_path_maxlen = strlen(dlldir);
 122         dll_paths[nb_dll_paths++] = dlldir;
 123     }
 124     else if ((build_dir = wine_get_build_dir()))
 125     {
 126         dll_path_maxlen = strlen(build_dir) + sizeof("/programs");
 127     }
 128
 129     if (count)
 130     {
 131         p = path;
 132         while (*p)
 133         {
 134             while (*p == ':') *p++ = 0;
 135             if (!*p) break;
 136             dll_paths[nb_dll_paths] = p;
 137             while (*p && *p != ':') p++;
 138             if (p - dll_paths[nb_dll_paths] > dll_path_maxlen)
 139                 dll_path_maxlen = p - dll_paths[nb_dll_paths];
 140             nb_dll_paths++;
 141         }
 142     }
 143
 144     /* append default dll dir (if not empty) to path */
 145     if ((len = strlen(default_dlldir)) > 0)
 146     {
 147         if (len > dll_path_maxlen) dll_path_maxlen = len;
 148         dll_paths[nb_dll_paths++] = default_dlldir;
 149     }
 150 }
 151
 152 /* check if the library is the correct architecture */
 153 /* only returns false for a valid library of the wrong arch */
 154 static int check_library_arch( int fd )
 155 {
 156 #ifdef __APPLE__
 157     struct  /* Mach-O header */
 158     {
 159         unsigned int magic;
 160         unsigned int cputype;
 161     } header;
 162
 163     if (read( fd, &header, sizeof(header) ) != sizeof(header)) return 1;
 164     if (header.magic != 0xfeedface) return 1;
 165     if (sizeof(void *) == sizeof(int)) return !(header.cputype >> 24);
 166     else return (header.cputype >> 24) == 1; /* CPU_ARCH_ABI64 */
 167 #else
 168     struct  /* ELF header */
 169     {
 170         unsigned char magic[4];
 171         unsigned char class;
 172         unsigned char data;
 173         unsigned char version;
 174     } header;
 175
 176     if (read( fd, &header, sizeof(header) ) != sizeof(header)) return 1;
 177     if (memcmp( header.magic, "\177ELF", 4 )) return 1;
 178     if (header.version != 1 /* EV_CURRENT */) return 1;
 179 #ifdef WORDS_BIGENDIAN
 180     if (header.data != 2 /* ELFDATA2MSB */) return 1;
 181 #else
 182     if (header.data != 1 /* ELFDATA2LSB */) return 1;
 183 #endif
 184     if (sizeof(void *) == sizeof(int)) return header.class == 1; /* ELFCLASS32 */
 185     else return header.class == 2; /* ELFCLASS64 */
 186 #endif
 187 }
 188
 189 /* check if a given file can be opened */
 190 static inline int file_exists( const char *name )
 191 {
 192     int ret = 0;
 193     int fd = open( name, O_RDONLY );
 194     if (fd != -1)
 195     {
 196         ret = check_library_arch( fd );
 197         close( fd );
 198     }
 199     return ret;
 200 }
 201
 202 static inline char *prepend( char *buffer, const char *str, size_t len )
 203 {
 204     return memcpy( buffer - len, str, len );
 205 }
 206
 207 /* get a filename from the next entry in the dll path */
 208 static char *next_dll_path( struct dll_path_context *context )
 209 {
 210     unsigned int index = context->index++;
 211     int namelen = context->namelen;
 212     char *path = context->name;
 213
 214     switch(index)
 215     {
 216     case 0:  /* try dlls dir with subdir prefix */
 217         if (namelen > 4 && !memcmp( context->name + namelen - 4, ".dll", 4 )) namelen -= 4;
 218         if (!context->win16) path = prepend( path, context->name, namelen );
 219         path = prepend( path, "/dlls", sizeof("/dlls") - 1 );
 220         path = prepend( path, build_dir, strlen(build_dir) );
 221         return path;
 222     case 1:  /* try programs dir with subdir prefix */
 223         if (!context->win16)
 224         {
 225             if (namelen > 4 && !memcmp( context->name + namelen - 4, ".exe", 4 )) namelen -= 4;
 226             path = prepend( path, context->name, namelen );
 227             path = prepend( path, "/programs", sizeof("/programs") - 1 );
 228             path = prepend( path, build_dir, strlen(build_dir) );
 229             return path;
 230         }
 231         context->index++;
 232         /* fall through */
 233     default:
 234         index -= 2;
 235         if (index < nb_dll_paths)
 236             return prepend( context->name, dll_paths[index], strlen( dll_paths[index] ));
 237         break;
 238     }
 239     return NULL;
 240 }
 241
 242
 243 /* get a filename from the first entry in the dll path */
 244 static char *first_dll_path( const char *name, int win16, struct dll_path_context *context )
 245 {
 246     char *p;
 247     int namelen = strlen( name );
 248     const char *ext = win16 ? "16" : ".so";
 249
 250     context->buffer = malloc( dll_path_maxlen + 2 * namelen + strlen(ext) + 3 );
 251     context->index = build_dir ? 0 : 2;  /* if no build dir skip all the build dir magic cases */
 252     context->name = context->buffer + dll_path_maxlen + namelen + 1;
 253     context->namelen = namelen + 1;
 254     context->win16 = win16;
 255
 256     /* store the name at the end of the buffer, followed by extension */
 257     p = context->name;
 258     *p++ = '/';
 259     memcpy( p, name, namelen );
 260     strcpy( p + namelen, ext );
 261     return next_dll_path( context );
 262 }
 263
 264
 265 /* free the dll path context created by first_dll_path */
 266 static inline void free_dll_path( struct dll_path_context *context )
 267 {
 268     free( context->buffer );
 269 }
 270
 271
 272 /* open a library for a given dll, searching in the dll path
 273  * 'name' must be the Windows dll name (e.g. "kernel32.dll") */
 274 static void *dlopen_dll( const char *name, char *error, int errorsize,
 275                          int test_only, int *exists )
 276 {
 277     struct dll_path_context context;
 278     char *path;
 279     void *ret = NULL;
 280
 281     *exists = 0;
 282     for (path = first_dll_path( name, 0, &context ); path; path = next_dll_path( &context ))
 283     {
 284         if (!test_only && (ret = wine_dlopen( path, RTLD_NOW, error, errorsize ))) break;
 285         if ((*exists = file_exists( path ))) break; /* exists but cannot be loaded, return the error */
 286     }
 287     free_dll_path( &context );
 288     return ret;
 289 }
 290
 291
 292 /* adjust an array of pointers to make them into RVAs */
 293 static inline void fixup_rva_ptrs( void *array, BYTE *base, unsigned int count )
 294 {
 295     void **src = (void **)array;
 296     DWORD *dst = (DWORD *)array;
 297     while (count--)
 298     {
 299         *dst++ = *src ? (BYTE *)*src - base : 0;
 300         src++;
 301     }
 302 }
 303
 304 /* fixup an array of RVAs by adding the specified delta */
 305 static inline void fixup_rva_dwords( DWORD *ptr, int delta, unsigned int count )
 306 {
 307     while (count--)
 308     {
 309         if (*ptr) *ptr += delta;
 310         ptr++;
 311     }
 312 }
 313
 314
 315 /* fixup RVAs in the import directory */
 316 static void fixup_imports( IMAGE_IMPORT_DESCRIPTOR *dir, BYTE *base, int delta )
 317 {
 318     UINT_PTR *ptr;
 319
 320     while (dir->Name)
 321     {
 322         fixup_rva_dwords( &dir->u.OriginalFirstThunk, delta, 1 );
 323         fixup_rva_dwords( &dir->Name, delta, 1 );
 324         fixup_rva_dwords( &dir->FirstThunk, delta, 1 );
 325         ptr = (UINT_PTR *)(base + (dir->u.OriginalFirstThunk ? dir->u.OriginalFirstThunk : dir->FirstThunk));
 326         while (*ptr)
 327         {
 328             if (!(*ptr & IMAGE_ORDINAL_FLAG)) *ptr += delta;
 329             ptr++;
 330         }
 331         dir++;
 332     }
 333 }
 334
 335
 336 /* fixup RVAs in the export directory */
 337 static void fixup_exports( IMAGE_EXPORT_DIRECTORY *dir, BYTE *base, int delta )
 338 {
 339     fixup_rva_dwords( &dir->Name, delta, 1 );
 340     fixup_rva_dwords( &dir->AddressOfFunctions, delta, 1 );
 341     fixup_rva_dwords( &dir->AddressOfNames, delta, 1 );
 342     fixup_rva_dwords( &dir->AddressOfNameOrdinals, delta, 1 );
 343     fixup_rva_dwords( (DWORD *)(base + dir->AddressOfNames), delta, dir->NumberOfNames );
 344     fixup_rva_ptrs( (base + dir->AddressOfFunctions), base, dir->NumberOfFunctions );
 345 }
 346
 347
 348 /* fixup RVAs in the resource directory */
 349 static void fixup_resources( IMAGE_RESOURCE_DIRECTORY *dir, BYTE *root, int delta )
 350 {
 351     IMAGE_RESOURCE_DIRECTORY_ENTRY *entry;
 352     int i;
 353
 354     entry = (IMAGE_RESOURCE_DIRECTORY_ENTRY *)(dir + 1);
 355     for (i = 0; i < dir->NumberOfNamedEntries + dir->NumberOfIdEntries; i++, entry++)
 356     {
 357         void *ptr = root + entry->u2.s3.OffsetToDirectory;
 358         if (entry->u2.s3.DataIsDirectory) fixup_resources( ptr, root, delta );
 359         else
 360         {
 361             IMAGE_RESOURCE_DATA_ENTRY *data = ptr;
 362             fixup_rva_dwords( &data->OffsetToData, delta, 1 );
 363         }
 364     }
 365 }
 366
 367
 368 /* map a builtin dll in memory and fixup RVAs */
 369 static void *map_dll( const IMAGE_NT_HEADERS *nt_descr )
 370 {
 371 #ifdef HAVE_MMAP
 372     IMAGE_DATA_DIRECTORY *dir;
 373     IMAGE_DOS_HEADER *dos;
 374     IMAGE_NT_HEADERS *nt;
 375     IMAGE_SECTION_HEADER *sec;
 376     BYTE *addr;
 377     DWORD code_start, data_start, data_end;
 378     const size_t page_size = getpagesize();
 379     const size_t page_mask = page_size - 1;
 380     int delta, nb_sections = 2;  /* code + data */
 381     unsigned int i;
 382
 383     size_t size = (sizeof(IMAGE_DOS_HEADER)
 384                    + sizeof(IMAGE_NT_HEADERS)
 385                    + nb_sections * sizeof(IMAGE_SECTION_HEADER));
 386
 387     assert( size <= page_size );
 388
 389     /* module address must be aligned on 64K boundary */
 390     addr = (BYTE *)((nt_descr->OptionalHeader.ImageBase + 0xffff) & ~0xffff);
 391     if (wine_anon_mmap( addr, page_size, PROT_READ|PROT_WRITE, MAP_FIXED ) != addr) return NULL;
 392
 393     dos    = (IMAGE_DOS_HEADER *)addr;
 394     nt     = (IMAGE_NT_HEADERS *)(dos + 1);
 395     sec    = (IMAGE_SECTION_HEADER *)(nt + 1);
 396
 397     /* Build the DOS and NT headers */
 398
 399     dos->e_magic    = IMAGE_DOS_SIGNATURE;
 400     dos->e_cblp     = 0x90;
 401     dos->e_cp       = 3;
 402     dos->e_cparhdr  = (sizeof(*dos)+0xf)/0x10;
 403     dos->e_minalloc = 0;
 404     dos->e_maxalloc = 0xffff;
 405     dos->e_ss       = 0x0000;
 406     dos->e_sp       = 0x00b8;
 407     dos->e_lfarlc   = sizeof(*dos);
 408     dos->e_lfanew   = sizeof(*dos);
 409
 410     *nt = *nt_descr;
 411
 412     delta      = (const BYTE *)nt_descr - addr;
 413     code_start = page_size;
 414     data_start = delta & ~page_mask;
 415     data_end   = (nt->OptionalHeader.SizeOfImage + delta + page_mask) & ~page_mask;
 416
 417     fixup_rva_ptrs( &nt->OptionalHeader.AddressOfEntryPoint, addr, 1 );
 418
 419     nt->FileHeader.NumberOfSections                = nb_sections;
 420     nt->OptionalHeader.BaseOfCode                  = code_start;
 421 #ifndef _WIN64
 422     nt->OptionalHeader.BaseOfData                  = data_start;
 423 #endif
 424     nt->OptionalHeader.SizeOfCode                  = data_start - code_start;
 425     nt->OptionalHeader.SizeOfInitializedData       = data_end - data_start;
 426     nt->OptionalHeader.SizeOfUninitializedData     = 0;
 427     nt->OptionalHeader.SizeOfImage                 = data_end;
 428     nt->OptionalHeader.ImageBase                   = (ULONG_PTR)addr;
 429
 430     /* Build the code section */
 431
 432     memcpy( sec->Name, ".text", sizeof(".text") );
 433     sec->SizeOfRawData = data_start - code_start;
 434     sec->Misc.VirtualSize = sec->SizeOfRawData;
 435     sec->VirtualAddress   = code_start;
 436     sec->PointerToRawData = code_start;
 437     sec->Characteristics  = (IMAGE_SCN_CNT_CODE | IMAGE_SCN_MEM_EXECUTE | IMAGE_SCN_MEM_READ);
 438     sec++;
 439
 440     /* Build the data section */
 441
 442     memcpy( sec->Name, ".data", sizeof(".data") );
 443     sec->SizeOfRawData = data_end - data_start;
 444     sec->Misc.VirtualSize = sec->SizeOfRawData;
 445     sec->VirtualAddress   = data_start;
 446     sec->PointerToRawData = data_start;
 447     sec->Characteristics  = (IMAGE_SCN_CNT_INITIALIZED_DATA |
 448                              IMAGE_SCN_MEM_WRITE | IMAGE_SCN_MEM_READ);
 449     sec++;
 450
 451     for (i = 0; i < nt->OptionalHeader.NumberOfRvaAndSizes; i++)
 452         fixup_rva_dwords( &nt->OptionalHeader.DataDirectory[i].VirtualAddress, delta, 1 );
 453
 454     /* Build the import directory */
 455
 456     dir = &nt->OptionalHeader.DataDirectory[IMAGE_FILE_IMPORT_DIRECTORY];
 457     if (dir->Size)
 458     {
 459         IMAGE_IMPORT_DESCRIPTOR *imports = (void *)(addr + dir->VirtualAddress);
 460         fixup_imports( imports, addr, delta );
 461     }
 462
 463     /* Build the resource directory */
 464
 465     dir = &nt->OptionalHeader.DataDirectory[IMAGE_FILE_RESOURCE_DIRECTORY];
 466     if (dir->Size)
 467     {
 468         void *ptr = (void *)(addr + dir->VirtualAddress);
 469         fixup_resources( ptr, ptr, delta );
 470     }
 471
 472     /* Build the export directory */
 473
 474     dir = &nt->OptionalHeader.DataDirectory[IMAGE_FILE_EXPORT_DIRECTORY];
 475     if (dir->Size)
 476     {
 477         IMAGE_EXPORT_DIRECTORY *exports = (void *)(addr + dir->VirtualAddress);
 478         fixup_exports( exports, addr, delta );
 479     }
 480     return addr;
 481 #else  /* HAVE_MMAP */
 482     return NULL;
 483 #endif  /* HAVE_MMAP */
 484 }
 485
 486
 487 /***********************************************************************
 488  *           __wine_get_main_environment
 489  *
 490  * Return an environment pointer to work around lack of environ variable.
 491  * Only exported on Mac OS.
 492  */
 493 char **__wine_get_main_environment(void)
 494 {
 495     return environ;
 496 }
 497
 498
 499 /***********************************************************************
 500  *           __wine_dll_register
 501  *
 502  * Register a built-in DLL descriptor.
 503  */
 504 void __wine_dll_register( const IMAGE_NT_HEADERS *header, const char *filename )
 505 {
 506     if (load_dll_callback) load_dll_callback( map_dll(header), filename );
 507     else
 508     {
 509         if (!(header->FileHeader.Characteristics & IMAGE_FILE_DLL))
 510             main_exe = header;
 511         else
 512         {
 513             assert( nb_dlls < MAX_DLLS );
 514             builtin_dlls[nb_dlls].nt = header;
 515             builtin_dlls[nb_dlls].filename = filename;
 516             nb_dlls++;
 517         }
 518     }
 519 }
 520
 521
 522 /***********************************************************************
 523  *           wine_dll_set_callback
 524  *
 525  * Set the callback function for dll loading, and call it
 526  * for all dlls that were implicitly loaded already.
 527  */
 528 void wine_dll_set_callback( load_dll_callback_t load )
 529 {
 530     int i;
 531     load_dll_callback = load;
 532     for (i = 0; i < nb_dlls; i++)
 533     {
 534         const IMAGE_NT_HEADERS *nt = builtin_dlls[i].nt;
 535         if (!nt) continue;
 536         builtin_dlls[i].nt = NULL;
 537         load_dll_callback( map_dll(nt), builtin_dlls[i].filename );
 538     }
 539     nb_dlls = 0;
 540     if (main_exe) load_dll_callback( map_dll(main_exe), "" );
 541 }
 542
 543
 544 /***********************************************************************
 545  *           wine_dll_load
 546  *
 547  * Load a builtin dll.
 548  */
 549 void *wine_dll_load( const char *filename, char *error, int errorsize, int *file_exists )
 550 {
 551     int i;
 552
 553     /* callback must have been set already */
 554     assert( load_dll_callback );
 555
 556     /* check if we have it in the list */
 557     /* this can happen when initializing pre-loaded dlls in wine_dll_set_callback */
 558     for (i = 0; i < nb_dlls; i++)
 559     {
 560         if (!builtin_dlls[i].nt) continue;
 561         if (!strcmp( builtin_dlls[i].filename, filename ))
 562         {
 563             const IMAGE_NT_HEADERS *nt = builtin_dlls[i].nt;
 564             builtin_dlls[i].nt = NULL;
 565             load_dll_callback( map_dll(nt), builtin_dlls[i].filename );
 566             *file_exists = 1;
 567             return (void *)1;
 568         }
 569     }
 570     return dlopen_dll( filename, error, errorsize, 0, file_exists );
 571 }
 572
 573
 574 /***********************************************************************
 575  *           wine_dll_unload
 576  *
 577  * Unload a builtin dll.
 578  */
 579 void wine_dll_unload( void *handle )
 580 {
 581     if (handle != (void *)1)
 582         wine_dlclose( handle, NULL, 0 );
 583 }
 584
 585
 586 /***********************************************************************
 587  *           wine_dll_load_main_exe
 588  *
 589  * Try to load the .so for the main exe.
 590  */
 591 void *wine_dll_load_main_exe( const char *name, char *error, int errorsize,
 592                               int test_only, int *file_exists )
 593 {
 594     return dlopen_dll( name, error, errorsize, test_only, file_exists );
 595 }
 596
 597
 598 /***********************************************************************
 599  *           wine_dll_enum_load_path
 600  *
 601  * Enumerate the dll load path.
 602  */
 603 const char *wine_dll_enum_load_path( unsigned int index )
 604 {
 605     if (index >= nb_dll_paths) return NULL;
 606     return dll_paths[index];
 607 }
 608
 609
 610 /***********************************************************************
 611  *           wine_dll_get_owner
 612  *
 613  * Retrieve the name of the 32-bit owner dll for a 16-bit dll.
 614  * Return 0 if OK, -1 on error.
 615  */
 616 int wine_dll_get_owner( const char *name, char *buffer, int size, int *exists )
 617 {
 618     int ret = -1;
 619     char *path;
 620     struct dll_path_context context;
 621
 622     *exists = 0;
 623
 624     for (path = first_dll_path( name, 1, &context ); path; path = next_dll_path( &context ))
 625     {
 626         int fd = open( path, O_RDONLY );
 627         if (fd != -1)
 628         {
 629             int res = read( fd, buffer, size - 1 );
 630             while (res > 0 && (buffer[res-1] == '\n' || buffer[res-1] == '\r')) res--;
 631             buffer[res] = 0;
 632             close( fd );
 633             *exists = 1;
 634             ret = 0;
 635             break;
 636         }
 637     }
 638     free_dll_path( &context );
 639     return ret;
 640 }
 641
 642
 643 /***********************************************************************
 644  *           set_max_limit
 645  *
 646  * Set a user limit to the maximum allowed value.
 647  */
 648 static void set_max_limit( int limit )
 649 {
 650 #ifdef HAVE_SETRLIMIT
 651     struct rlimit rlimit;
 652
 653     if (!getrlimit( limit, &rlimit ))
 654     {
 655         rlimit.rlim_cur = rlimit.rlim_max;
 656         if (setrlimit( limit, &rlimit ) != 0)
 657         {
 658 #if defined(__APPLE__) && defined(RLIMIT_NOFILE) && defined(OPEN_MAX)
 659             /* On Leopard, setrlimit(RLIMIT_NOFILE, ...) fails on attempts to set
 660              * rlim_cur above OPEN_MAX (even if rlim_max > OPEN_MAX). */
 661             if (limit == RLIMIT_NOFILE && rlimit.rlim_cur > OPEN_MAX)
 662             {
 663                 rlimit.rlim_cur = OPEN_MAX;
 664                 setrlimit( limit, &rlimit );
 665             }
 666 #endif
 667         }
 668     }
 669 #endif
 670 }
 671
 672
 673 #ifdef __APPLE__
 674 struct apple_stack_info
 675 {
 676     void *stack;
 677     size_t desired_size;
 678 };
 679
 680 /***********************************************************************
 681  *           apple_alloc_thread_stack
 682  *
 683  * Callback for wine_mmap_enum_reserved_areas to allocate space for
 684  * the secondary thread's stack.
 685  */
 686 static int apple_alloc_thread_stack( void *base, size_t size, void *arg )
 687 {
 688     struct apple_stack_info *info = arg;
 689
 690     /* For mysterious reasons, putting the thread stack at the very top
 691      * of the address space causes subsequent execs to fail, even on the
 692      * child side of a fork.  Avoid the top 16MB. */
 693     char * const limit = (char*)0xff000000;
 694     if ((char *)base >= limit) return 0;
 695     if (size > limit - (char*)base)
 696         size = limit - (char*)base;
 697     if (size < info->desired_size) return 0;
 698     info->stack = wine_anon_mmap( (char *)base + size - info->desired_size,
 699                                   info->desired_size, PROT_READ|PROT_WRITE, MAP_FIXED );
 700     return (info->stack != (void *)-1);
 701 }
 702
 703 /***********************************************************************
 704  *           apple_create_wine_thread
 705  *
 706  * Spin off a secondary thread to complete Wine initialization, leaving
 707  * the original thread for the Mac frameworks.
 708  *
 709  * Invoked as a CFRunLoopSource perform callback.
 710  */
 711 static void apple_create_wine_thread( void *init_func )
 712 {
 713     int success = 0;
 714     pthread_t thread;
 715     pthread_attr_t attr;
 716
 717     if (!pthread_attr_init( &attr ))
 718     {
 719         struct apple_stack_info info;
 720
 721         /* Try to put the new thread's stack in the reserved area.  If this
 722          * fails, just let it go wherever.  It'll be a waste of space, but we
 723          * can go on. */
 724         if (!pthread_attr_getstacksize( &attr, &info.desired_size ) &&
 725             wine_mmap_enum_reserved_areas( apple_alloc_thread_stack, &info, 1 ))
 726         {
 727             wine_mmap_remove_reserved_area( info.stack, info.desired_size, 0 );
 728             pthread_attr_setstackaddr( &attr, (char*)info.stack + info.desired_size );
 729         }
 730
 731         if (!pthread_attr_setdetachstate( &attr, PTHREAD_CREATE_JOINABLE ) &&
 732             !pthread_create( &thread, &attr, init_func, NULL ))
 733             success = 1;
 734
 735         pthread_attr_destroy( &attr );
 736     }
 737
 738     /* Failure is indicated by returning from wine_init().  Stopping
 739      * the run loop allows apple_main_thread() and thus wine_init() to
 740      * return. */
 741     if (!success)
 742         CFRunLoopStop( CFRunLoopGetCurrent() );
 743 }
 744
 745
 746 /***********************************************************************
 747  *           apple_main_thread
 748  *
 749  * Park the process's original thread in a Core Foundation run loop for
 750  * use by the Mac frameworks, especially receiving and handling
 751  * distributed notifications.  Spin off a new thread for the rest of the
 752  * Wine initialization.
 753  */
 754 static void apple_main_thread( void (*init_func)(void) )
 755 {
 756     CFRunLoopSourceContext source_context = { 0 };
 757     CFRunLoopSourceRef source;
 758
 759     /* Give ourselves the best chance of having the distributed notification
 760      * center scheduled on this thread's run loop.  In theory, it's scheduled
 761      * in the first thread to ask for it. */
 762     CFNotificationCenterGetDistributedCenter();
 763
 764     /* We use this run loop source for two purposes.  First, a run loop exits
 765      * if it has no more sources scheduled.  So, we need at least one source
 766      * to keep the run loop running.  Second, although it's not critical, it's
 767      * preferable for the Wine initialization to not proceed until we know
 768      * the run loop is running.  So, we signal our source immediately after
 769      * adding it and have its callback spin off the Wine thread. */
 770     source_context.info = init_func;
 771     source_context.perform = apple_create_wine_thread;
 772     source = CFRunLoopSourceCreate( NULL, 0, &source_context );
 773
 774     if (source)
 775     {
 776         CFRunLoopAddSource( CFRunLoopGetCurrent(), source, kCFRunLoopCommonModes );
 777         CFRunLoopSourceSignal( source );
 778         CFRelease( source );
 779
 780         CFRunLoopRun(); /* Should never return, except on error. */
 781     }
 782
 783     /* If we get here (i.e. return), that indicates failure to our caller. */
 784 }
 785 #endif
 786
 787
 788 /***********************************************************************
 789  *           wine_init
 790  *
 791  * Main Wine initialisation.
 792  */
 793 void wine_init( int argc, char *argv[], char *error, int error_size )
 794 {
 795     struct dll_path_context context;
 796     char *path;
 797     void *ntdll = NULL;
 798     void (*init_func)(void);
 799
 800     /* force a few limits that are set too low on some platforms */
 801 #ifdef RLIMIT_NOFILE
 802     set_max_limit( RLIMIT_NOFILE );
 803 #endif
 804 #ifdef RLIMIT_AS
 805     set_max_limit( RLIMIT_AS );
 806 #endif
 807
 808     wine_init_argv0_path( argv[0] );
 809     build_dll_path();
 810     __wine_main_argc = argc;
 811     __wine_main_argv = argv;
 812     __wine_main_environ = __wine_get_main_environment();
 813     mmap_init();
 814
 815     for (path = first_dll_path( "ntdll.dll", 0, &context ); path; path = next_dll_path( &context ))
 816     {
 817         if ((ntdll = wine_dlopen( path, RTLD_NOW, error, error_size )))
 818         {
 819             /* if we didn't use the default dll dir, remove it from the search path */
 820             if (default_dlldir[0] && context.index < nb_dll_paths + 2) nb_dll_paths--;
 821             break;
 822         }
 823     }
 824     free_dll_path( &context );
 825
 826     if (!ntdll) return;
 827     if (!(init_func = wine_dlsym( ntdll, "__wine_process_init", error, error_size ))) return;
 828 #ifdef __APPLE__
 829     apple_main_thread( init_func );
 830 #else
 831     init_func();
 832 #endif
 833 }
 834
 835
 836 /*
 837  * These functions provide wrappers around dlopen() and associated
 838  * functions.  They work around a bug in glibc 2.1.x where calling
 839  * a dl*() function after a previous dl*() function has failed
 840  * without a dlerror() call between the two will cause a crash.
 841  * They all take a pointer to a buffer that
 842  * will receive the error description (from dlerror()).  This
 843  * parameter may be NULL if the error description is not required.
 844  */
 845
 846 #ifndef RTLD_FIRST
 847 #define RTLD_FIRST 0
 848 #endif
 849
 850 /***********************************************************************
 851  *              wine_dlopen
 852  */
 853 void *wine_dlopen( const char *filename, int flag, char *error, size_t errorsize )
 854 {
 855 #ifdef HAVE_DLOPEN
 856     void *ret;
 857     const char *s;
 858
 859 #ifdef __APPLE__
 860     /* the Mac OS loader pretends to be able to load PE files, so avoid them here */
 861     unsigned char magic[2];
 862     int fd = open( filename, O_RDONLY );
 863     if (fd != -1)
 864     {
 865         if (pread( fd, magic, 2, 0 ) == 2 && magic[0] == 'M' && magic[1] == 'Z')
 866         {
 867             static const char msg[] = "MZ format";
 868             size_t len = min( errorsize, sizeof(msg) );
 869             memcpy( error, msg, len );
 870             error[len - 1] = 0;
 871             close( fd );
 872             return NULL;
 873         }
 874         close( fd );
 875     }
 876 #endif
 877     dlerror(); dlerror();
 878 #ifdef __sun
 879     if (strchr( filename, ':' ))
 880     {
 881         char path[PATH_MAX];
 882         /* Solaris' brain damaged dlopen() treats ':' as a path separator */
 883         realpath( filename, path );
 884         ret = dlopen( path, flag | RTLD_FIRST );
 885     }
 886     else
 887 #endif
 888     ret = dlopen( filename, flag | RTLD_FIRST );
 889     s = dlerror();
 890     if (error && errorsize)
 891     {
 892         if (s)
 893         {
 894             size_t len = strlen(s);
 895             if (len >= errorsize) len = errorsize - 1;
 896             memcpy( error, s, len );
 897             error[len] = 0;
 898         }
 899         else error[0] = 0;
 900     }
 901     dlerror();
 902     return ret;
 903 #else
 904     if (error)
 905     {
 906         static const char msg[] = "dlopen interface not detected by configure";
 907         size_t len = min( errorsize, sizeof(msg) );
 908         memcpy( error, msg, len );
 909         error[len - 1] = 0;
 910     }
 911     return NULL;
 912 #endif
 913 }
 914
 915 /***********************************************************************
 916  *              wine_dlsym
 917  */
 918 void *wine_dlsym( void *handle, const char *symbol, char *error, size_t errorsize )
 919 {
 920 #ifdef HAVE_DLOPEN
 921     void *ret;
 922     const char *s;
 923     dlerror(); dlerror();
 924     ret = dlsym( handle, symbol );
 925     s = dlerror();
 926     if (error && errorsize)
 927     {
 928         if (s)
 929         {
 930             size_t len = strlen(s);
 931             if (len >= errorsize) len = errorsize - 1;
 932             memcpy( error, s, len );
 933             error[len] = 0;
 934         }
 935         else error[0] = 0;
 936     }
 937     dlerror();
 938     return ret;
 939 #else
 940     if (error)
 941     {
 942         static const char msg[] = "dlopen interface not detected by configure";
 943         size_t len = min( errorsize, sizeof(msg) );
 944         memcpy( error, msg, len );
 945         error[len - 1] = 0;
 946     }
 947     return NULL;
 948 #endif
 949 }
 950
 951 /***********************************************************************
 952  *              wine_dlclose
 953  */
 954 int wine_dlclose( void *handle, char *error, size_t errorsize )
 955 {
 956 #ifdef HAVE_DLOPEN
 957     int ret;
 958     const char *s;
 959     dlerror(); dlerror();
 960     ret = dlclose( handle );
 961     s = dlerror();
 962     if (error && errorsize)
 963     {
 964         if (s)
 965         {
 966             size_t len = strlen(s);
 967             if (len >= errorsize) len = errorsize - 1;
 968             memcpy( error, s, len );
 969             error[len] = 0;
 970         }
 971         else error[0] = 0;
 972     }
 973     dlerror();
 974     return ret;
 975 #else
 976     if (error)
 977     {
 978         static const char msg[] = "dlopen interface not detected by configure";
 979         size_t len = min( errorsize, sizeof(msg) );
 980         memcpy( error, msg, len );
 981         error[len - 1] = 0;
 982     }
 983     return 1;
 984 #endif
 985 }