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 #ifdef __APPLE__
  43 #include <crt_externs.h>
  44 #define environ (*_NSGetEnviron())
  45 #include <CoreFoundation/CoreFoundation.h>
  46 #define LoadResource MacLoadResource
  47 #define GetCurrentThread MacGetCurrentThread
  48 #include <CoreServices/CoreServices.h>
  49 #undef LoadResource
  50 #undef GetCurrentThread
  51 #include <pthread.h>
  52 #else
  53 extern char **environ;
  54 #endif
  55
  56 #define NONAMELESSUNION
  57 #define NONAMELESSSTRUCT
  58 #include "windef.h"
  59 #include "winbase.h"
  60 #include "wine/library.h"
  61
  62 /* argc/argv for the Windows application */
  63 int __wine_main_argc = 0;
  64 char **__wine_main_argv = NULL;
  65 WCHAR **__wine_main_wargv = NULL;
  66 char **__wine_main_environ = NULL;
  67
  68 struct dll_path_context
  69 {
  70     unsigned int index; /* current index in the dll path list */
  71     char *buffer;       /* buffer used for storing path names */
  72     char *name;         /* start of file name part in buffer (including leading slash) */
  73     int   namelen;      /* length of file name without .so extension */
  74     int   win16;        /* 16-bit dll search */
  75 };
  76
  77 #define MAX_DLLS 100
  78
  79 static struct
  80 {
  81     const IMAGE_NT_HEADERS *nt;           /* NT header */
  82     const char             *filename;     /* DLL file name */
  83 } builtin_dlls[MAX_DLLS];
  84
  85 static int nb_dlls;
  86
  87 static const IMAGE_NT_HEADERS *main_exe;
  88
  89 static load_dll_callback_t load_dll_callback;
  90
  91 static const char *build_dir;
  92 static const char *default_dlldir;
  93 static const char **dll_paths;
  94 static unsigned int nb_dll_paths;
  95 static int dll_path_maxlen;
  96
  97 extern void mmap_init(void);
  98 extern const char *get_dlldir( const char **default_dlldir );
  99
 100 /* build the dll load path from the WINEDLLPATH variable */
 101 static void build_dll_path(void)
 102 {
 103     int len, count = 0;
 104     char *p, *path = getenv( "WINEDLLPATH" );
 105     const char *dlldir = get_dlldir( &default_dlldir );
 106
 107     if (path)
 108     {
 109         /* count how many path elements we need */
 110         path = strdup(path);
 111         p = path;
 112         while (*p)
 113         {
 114             while (*p == ':') p++;
 115             if (!*p) break;
 116             count++;
 117             while (*p && *p != ':') p++;
 118         }
 119     }
 120
 121     dll_paths = malloc( (count+2) * sizeof(*dll_paths) );
 122     nb_dll_paths = 0;
 123
 124     if (dlldir)
 125     {
 126         dll_path_maxlen = strlen(dlldir);
 127         dll_paths[nb_dll_paths++] = dlldir;
 128     }
 129     else if ((build_dir = wine_get_build_dir()))
 130     {
 131         dll_path_maxlen = strlen(build_dir) + sizeof("/programs");
 132     }
 133
 134     if (count)
 135     {
 136         p = path;
 137         while (*p)
 138         {
 139             while (*p == ':') *p++ = 0;
 140             if (!*p) break;
 141             dll_paths[nb_dll_paths] = p;
 142             while (*p && *p != ':') p++;
 143             if (p - dll_paths[nb_dll_paths] > dll_path_maxlen)
 144                 dll_path_maxlen = p - dll_paths[nb_dll_paths];
 145             nb_dll_paths++;
 146         }
 147     }
 148
 149     /* append default dll dir (if not empty) to path */
 150     if ((len = strlen(default_dlldir)) > 0)
 151     {
 152         if (len > dll_path_maxlen) dll_path_maxlen = len;
 153         dll_paths[nb_dll_paths++] = default_dlldir;
 154     }
 155 }
 156
 157 /* check if the library is the correct architecture */
 158 /* only returns false for a valid library of the wrong arch */
 159 static int check_library_arch( int fd )
 160 {
 161 #ifdef __APPLE__
 162     struct  /* Mach-O header */
 163     {
 164         unsigned int magic;
 165         unsigned int cputype;
 166     } header;
 167
 168     if (read( fd, &header, sizeof(header) ) != sizeof(header)) return 1;
 169     if (header.magic != 0xfeedface) return 1;
 170     if (sizeof(void *) == sizeof(int)) return !(header.cputype >> 24);
 171     else return (header.cputype >> 24) == 1; /* CPU_ARCH_ABI64 */
 172 #else
 173     struct  /* ELF header */
 174     {
 175         unsigned char magic[4];
 176         unsigned char class;
 177         unsigned char data;
 178         unsigned char version;
 179     } header;
 180
 181     if (read( fd, &header, sizeof(header) ) != sizeof(header)) return 1;
 182     if (memcmp( header.magic, "\177ELF", 4 )) return 1;
 183     if (header.version != 1 /* EV_CURRENT */) return 1;
 184 #ifdef WORDS_BIGENDIAN
 185     if (header.data != 2 /* ELFDATA2MSB */) return 1;
 186 #else
 187     if (header.data != 1 /* ELFDATA2LSB */) return 1;
 188 #endif
 189     if (sizeof(void *) == sizeof(int)) return header.class == 1; /* ELFCLASS32 */
 190     else return header.class == 2; /* ELFCLASS64 */
 191 #endif
 192 }
 193
 194 /* check if a given file can be opened */
 195 static inline int file_exists( const char *name )
 196 {
 197     int ret = 0;
 198     int fd = open( name, O_RDONLY );
 199     if (fd != -1)
 200     {
 201         ret = check_library_arch( fd );
 202         close( fd );
 203     }
 204     return ret;
 205 }
 206
 207 static inline char *prepend( char *buffer, const char *str, size_t len )
 208 {
 209     return memcpy( buffer - len, str, len );
 210 }
 211
 212 /* get a filename from the next entry in the dll path */
 213 static char *next_dll_path( struct dll_path_context *context )
 214 {
 215     unsigned int index = context->index++;
 216     int namelen = context->namelen;
 217     char *path = context->name;
 218
 219     switch(index)
 220     {
 221     case 0:  /* try dlls dir with subdir prefix */
 222         if (namelen > 4 && !memcmp( context->name + namelen - 4, ".dll", 4 )) namelen -= 4;
 223         if (!context->win16) path = prepend( path, context->name, namelen );
 224         path = prepend( path, "/dlls", sizeof("/dlls") - 1 );
 225         path = prepend( path, build_dir, strlen(build_dir) );
 226         return path;
 227     case 1:  /* try programs dir with subdir prefix */
 228         if (!context->win16)
 229         {
 230             if (namelen > 4 && !memcmp( context->name + namelen - 4, ".exe", 4 )) namelen -= 4;
 231             path = prepend( path, context->name, namelen );
 232             path = prepend( path, "/programs", sizeof("/programs") - 1 );
 233             path = prepend( path, build_dir, strlen(build_dir) );
 234             return path;
 235         }
 236         context->index++;
 237         /* fall through */
 238     default:
 239         index -= 2;
 240         if (index < nb_dll_paths)
 241             return prepend( context->name, dll_paths[index], strlen( dll_paths[index] ));
 242         break;
 243     }
 244     return NULL;
 245 }
 246
 247
 248 /* get a filename from the first entry in the dll path */
 249 static char *first_dll_path( const char *name, int win16, struct dll_path_context *context )
 250 {
 251     char *p;
 252     int namelen = strlen( name );
 253     const char *ext = win16 ? "16" : ".so";
 254
 255     context->buffer = malloc( dll_path_maxlen + 2 * namelen + strlen(ext) + 3 );
 256     context->index = build_dir ? 0 : 2;  /* if no build dir skip all the build dir magic cases */
 257     context->name = context->buffer + dll_path_maxlen + namelen + 1;
 258     context->namelen = namelen + 1;
 259     context->win16 = win16;
 260
 261     /* store the name at the end of the buffer, followed by extension */
 262     p = context->name;
 263     *p++ = '/';
 264     memcpy( p, name, namelen );
 265     strcpy( p + namelen, ext );
 266     return next_dll_path( context );
 267 }
 268
 269
 270 /* free the dll path context created by first_dll_path */
 271 static inline void free_dll_path( struct dll_path_context *context )
 272 {
 273     free( context->buffer );
 274 }
 275
 276
 277 /* open a library for a given dll, searching in the dll path
 278  * 'name' must be the Windows dll name (e.g. "kernel32.dll") */
 279 static void *dlopen_dll( const char *name, char *error, int errorsize,
 280                          int test_only, int *exists )
 281 {
 282     struct dll_path_context context;
 283     char *path;
 284     void *ret = NULL;
 285
 286     *exists = 0;
 287     for (path = first_dll_path( name, 0, &context ); path; path = next_dll_path( &context ))
 288     {
 289         if (!test_only && (ret = wine_dlopen( path, RTLD_NOW, error, errorsize ))) break;
 290         if ((*exists = file_exists( path ))) break; /* exists but cannot be loaded, return the error */
 291     }
 292     free_dll_path( &context );
 293     return ret;
 294 }
 295
 296
 297 /* adjust an array of pointers to make them into RVAs */
 298 static inline void fixup_rva_ptrs( void *array, BYTE *base, unsigned int count )
 299 {
 300     void **src = (void **)array;
 301     DWORD *dst = (DWORD *)array;
 302     while (count--)
 303     {
 304         *dst++ = *src ? (BYTE *)*src - base : 0;
 305         src++;
 306     }
 307 }
 308
 309 /* fixup an array of RVAs by adding the specified delta */
 310 static inline void fixup_rva_dwords( DWORD *ptr, int delta, unsigned int count )
 311 {
 312     while (count--)
 313     {
 314         if (*ptr) *ptr += delta;
 315         ptr++;
 316     }
 317 }
 318
 319
 320 /* fixup RVAs in the import directory */
 321 static void fixup_imports( IMAGE_IMPORT_DESCRIPTOR *dir, BYTE *base, int delta )
 322 {
 323     UINT_PTR *ptr;
 324
 325     while (dir->Name)
 326     {
 327         fixup_rva_dwords( &dir->u.OriginalFirstThunk, delta, 1 );
 328         fixup_rva_dwords( &dir->Name, delta, 1 );
 329         fixup_rva_dwords( &dir->FirstThunk, delta, 1 );
 330         ptr = (UINT_PTR *)(base + (dir->u.OriginalFirstThunk ? dir->u.OriginalFirstThunk : dir->FirstThunk));
 331         while (*ptr)
 332         {
 333             if (!(*ptr & IMAGE_ORDINAL_FLAG)) *ptr += delta;
 334             ptr++;
 335         }
 336         dir++;
 337     }
 338 }
 339
 340
 341 /* fixup RVAs in the export directory */
 342 static void fixup_exports( IMAGE_EXPORT_DIRECTORY *dir, BYTE *base, int delta )
 343 {
 344     fixup_rva_dwords( &dir->Name, delta, 1 );
 345     fixup_rva_dwords( &dir->AddressOfFunctions, delta, 1 );
 346     fixup_rva_dwords( &dir->AddressOfNames, delta, 1 );
 347     fixup_rva_dwords( &dir->AddressOfNameOrdinals, delta, 1 );
 348     fixup_rva_dwords( (DWORD *)(base + dir->AddressOfNames), delta, dir->NumberOfNames );
 349     fixup_rva_ptrs( (base + dir->AddressOfFunctions), base, dir->NumberOfFunctions );
 350 }
 351
 352
 353 /* fixup RVAs in the resource directory */
 354 static void fixup_resources( IMAGE_RESOURCE_DIRECTORY *dir, BYTE *root, int delta )
 355 {
 356     IMAGE_RESOURCE_DIRECTORY_ENTRY *entry;
 357     int i;
 358
 359     entry = (IMAGE_RESOURCE_DIRECTORY_ENTRY *)(dir + 1);
 360     for (i = 0; i < dir->NumberOfNamedEntries + dir->NumberOfIdEntries; i++, entry++)
 361     {
 362         void *ptr = root + entry->u2.s3.OffsetToDirectory;
 363         if (entry->u2.s3.DataIsDirectory) fixup_resources( ptr, root, delta );
 364         else
 365         {
 366             IMAGE_RESOURCE_DATA_ENTRY *data = ptr;
 367             fixup_rva_dwords( &data->OffsetToData, delta, 1 );
 368         }
 369     }
 370 }
 371
 372
 373 /* map a builtin dll in memory and fixup RVAs */
 374 static void *map_dll( const IMAGE_NT_HEADERS *nt_descr )
 375 {
 376 #ifdef HAVE_MMAP
 377     IMAGE_DATA_DIRECTORY *dir;
 378     IMAGE_DOS_HEADER *dos;
 379     IMAGE_NT_HEADERS *nt;
 380     IMAGE_SECTION_HEADER *sec;
 381     BYTE *addr;
 382     DWORD code_start, data_start, data_end;
 383     const size_t page_size = sysconf( _SC_PAGESIZE );
 384     const size_t page_mask = page_size - 1;
 385     int delta, nb_sections = 2;  /* code + data */
 386     unsigned int i;
 387
 388     size_t size = (sizeof(IMAGE_DOS_HEADER)
 389                    + sizeof(IMAGE_NT_HEADERS)
 390                    + nb_sections * sizeof(IMAGE_SECTION_HEADER));
 391
 392     assert( size <= page_size );
 393
 394     /* module address must be aligned on 64K boundary */
 395     addr = (BYTE *)((nt_descr->OptionalHeader.ImageBase + 0xffff) & ~0xffff);
 396     if (wine_anon_mmap( addr, page_size, PROT_READ|PROT_WRITE, MAP_FIXED ) != addr) return NULL;
 397
 398     dos    = (IMAGE_DOS_HEADER *)addr;
 399     nt     = (IMAGE_NT_HEADERS *)(dos + 1);
 400     sec    = (IMAGE_SECTION_HEADER *)(nt + 1);
 401
 402     /* Build the DOS and NT headers */
 403
 404     dos->e_magic    = IMAGE_DOS_SIGNATURE;
 405     dos->e_cblp     = 0x90;
 406     dos->e_cp       = 3;
 407     dos->e_cparhdr  = (sizeof(*dos)+0xf)/0x10;
 408     dos->e_minalloc = 0;
 409     dos->e_maxalloc = 0xffff;
 410     dos->e_ss       = 0x0000;
 411     dos->e_sp       = 0x00b8;
 412     dos->e_lfarlc   = sizeof(*dos);
 413     dos->e_lfanew   = sizeof(*dos);
 414
 415     *nt = *nt_descr;
 416
 417     delta      = (const BYTE *)nt_descr - addr;
 418     code_start = page_size;
 419     data_start = delta & ~page_mask;
 420     data_end   = (nt->OptionalHeader.SizeOfImage + delta + page_mask) & ~page_mask;
 421
 422     fixup_rva_ptrs( &nt->OptionalHeader.AddressOfEntryPoint, addr, 1 );
 423
 424     nt->FileHeader.NumberOfSections                = nb_sections;
 425     nt->OptionalHeader.BaseOfCode                  = code_start;
 426 #ifndef _WIN64
 427     nt->OptionalHeader.BaseOfData                  = data_start;
 428 #endif
 429     nt->OptionalHeader.SizeOfCode                  = data_start - code_start;
 430     nt->OptionalHeader.SizeOfInitializedData       = data_end - data_start;
 431     nt->OptionalHeader.SizeOfUninitializedData     = 0;
 432     nt->OptionalHeader.SizeOfImage                 = data_end;
 433     nt->OptionalHeader.ImageBase                   = (ULONG_PTR)addr;
 434
 435     /* Build the code section */
 436
 437     memcpy( sec->Name, ".text", sizeof(".text") );
 438     sec->SizeOfRawData = data_start - code_start;
 439     sec->Misc.VirtualSize = sec->SizeOfRawData;
 440     sec->VirtualAddress   = code_start;
 441     sec->PointerToRawData = code_start;
 442     sec->Characteristics  = (IMAGE_SCN_CNT_CODE | IMAGE_SCN_MEM_EXECUTE | IMAGE_SCN_MEM_READ);
 443     sec++;
 444
 445     /* Build the data section */
 446
 447     memcpy( sec->Name, ".data", sizeof(".data") );
 448     sec->SizeOfRawData = data_end - data_start;
 449     sec->Misc.VirtualSize = sec->SizeOfRawData;
 450     sec->VirtualAddress   = data_start;
 451     sec->PointerToRawData = data_start;
 452     sec->Characteristics  = (IMAGE_SCN_CNT_INITIALIZED_DATA |
 453                              IMAGE_SCN_MEM_WRITE | IMAGE_SCN_MEM_READ);
 454     sec++;
 455
 456     for (i = 0; i < nt->OptionalHeader.NumberOfRvaAndSizes; i++)
 457         fixup_rva_dwords( &nt->OptionalHeader.DataDirectory[i].VirtualAddress, delta, 1 );
 458
 459     /* Build the import directory */
 460
 461     dir = &nt->OptionalHeader.DataDirectory[IMAGE_FILE_IMPORT_DIRECTORY];
 462     if (dir->Size)
 463     {
 464         IMAGE_IMPORT_DESCRIPTOR *imports = (void *)(addr + dir->VirtualAddress);
 465         fixup_imports( imports, addr, delta );
 466     }
 467
 468     /* Build the resource directory */
 469
 470     dir = &nt->OptionalHeader.DataDirectory[IMAGE_FILE_RESOURCE_DIRECTORY];
 471     if (dir->Size)
 472     {
 473         void *ptr = (void *)(addr + dir->VirtualAddress);
 474         fixup_resources( ptr, ptr, delta );
 475     }
 476
 477     /* Build the export directory */
 478
 479     dir = &nt->OptionalHeader.DataDirectory[IMAGE_FILE_EXPORT_DIRECTORY];
 480     if (dir->Size)
 481     {
 482         IMAGE_EXPORT_DIRECTORY *exports = (void *)(addr + dir->VirtualAddress);
 483         fixup_exports( exports, addr, delta );
 484     }
 485     return addr;
 486 #else  /* HAVE_MMAP */
 487     return NULL;
 488 #endif  /* HAVE_MMAP */
 489 }
 490
 491
 492 /***********************************************************************
 493  *           __wine_get_main_environment
 494  *
 495  * Return an environment pointer to work around lack of environ variable.
 496  * Only exported on Mac OS.
 497  */
 498 char **__wine_get_main_environment(void)
 499 {
 500     return environ;
 501 }
 502
 503
 504 /***********************************************************************
 505  *           __wine_dll_register
 506  *
 507  * Register a built-in DLL descriptor.
 508  */
 509 void __wine_dll_register( const IMAGE_NT_HEADERS *header, const char *filename )
 510 {
 511     if (load_dll_callback) load_dll_callback( map_dll(header), filename );
 512     else
 513     {
 514         if (!(header->FileHeader.Characteristics & IMAGE_FILE_DLL))
 515             main_exe = header;
 516         else
 517         {
 518             assert( nb_dlls < MAX_DLLS );
 519             builtin_dlls[nb_dlls].nt = header;
 520             builtin_dlls[nb_dlls].filename = filename;
 521             nb_dlls++;
 522         }
 523     }
 524 }
 525
 526
 527 /***********************************************************************
 528  *           wine_dll_set_callback
 529  *
 530  * Set the callback function for dll loading, and call it
 531  * for all dlls that were implicitly loaded already.
 532  */
 533 void wine_dll_set_callback( load_dll_callback_t load )
 534 {
 535     int i;
 536     load_dll_callback = load;
 537     for (i = 0; i < nb_dlls; i++)
 538     {
 539         const IMAGE_NT_HEADERS *nt = builtin_dlls[i].nt;
 540         if (!nt) continue;
 541         builtin_dlls[i].nt = NULL;
 542         load_dll_callback( map_dll(nt), builtin_dlls[i].filename );
 543     }
 544     nb_dlls = 0;
 545     if (main_exe) load_dll_callback( map_dll(main_exe), "" );
 546 }
 547
 548
 549 /***********************************************************************
 550  *           wine_dll_load
 551  *
 552  * Load a builtin dll.
 553  */
 554 void *wine_dll_load( const char *filename, char *error, int errorsize, int *file_exists )
 555 {
 556     int i;
 557
 558     /* callback must have been set already */
 559     assert( load_dll_callback );
 560
 561     /* check if we have it in the list */
 562     /* this can happen when initializing pre-loaded dlls in wine_dll_set_callback */
 563     for (i = 0; i < nb_dlls; i++)
 564     {
 565         if (!builtin_dlls[i].nt) continue;
 566         if (!strcmp( builtin_dlls[i].filename, filename ))
 567         {
 568             const IMAGE_NT_HEADERS *nt = builtin_dlls[i].nt;
 569             builtin_dlls[i].nt = NULL;
 570             load_dll_callback( map_dll(nt), builtin_dlls[i].filename );
 571             *file_exists = 1;
 572             return (void *)1;
 573         }
 574     }
 575     return dlopen_dll( filename, error, errorsize, 0, file_exists );
 576 }
 577
 578
 579 /***********************************************************************
 580  *           wine_dll_unload
 581  *
 582  * Unload a builtin dll.
 583  */
 584 void wine_dll_unload( void *handle )
 585 {
 586     if (handle != (void *)1)
 587         wine_dlclose( handle, NULL, 0 );
 588 }
 589
 590
 591 /***********************************************************************
 592  *           wine_dll_load_main_exe
 593  *
 594  * Try to load the .so for the main exe.
 595  */
 596 void *wine_dll_load_main_exe( const char *name, char *error, int errorsize,
 597                               int test_only, int *file_exists )
 598 {
 599     return dlopen_dll( name, error, errorsize, test_only, file_exists );
 600 }
 601
 602
 603 /***********************************************************************
 604  *           wine_dll_enum_load_path
 605  *
 606  * Enumerate the dll load path.
 607  */
 608 const char *wine_dll_enum_load_path( unsigned int index )
 609 {
 610     if (index >= nb_dll_paths) return NULL;
 611     return dll_paths[index];
 612 }
 613
 614
 615 /***********************************************************************
 616  *           wine_dll_get_owner
 617  *
 618  * Retrieve the name of the 32-bit owner dll for a 16-bit dll.
 619  * Return 0 if OK, -1 on error.
 620  */
 621 int wine_dll_get_owner( const char *name, char *buffer, int size, int *exists )
 622 {
 623     int ret = -1;
 624     char *path;
 625     struct dll_path_context context;
 626
 627     *exists = 0;
 628
 629     for (path = first_dll_path( name, 1, &context ); path; path = next_dll_path( &context ))
 630     {
 631         int fd = open( path, O_RDONLY );
 632         if (fd != -1)
 633         {
 634             int res = read( fd, buffer, size - 1 );
 635             while (res > 0 && (buffer[res-1] == '\n' || buffer[res-1] == '\r')) res--;
 636             buffer[res] = 0;
 637             close( fd );
 638             *exists = 1;
 639             ret = 0;
 640             break;
 641         }
 642     }
 643     free_dll_path( &context );
 644     return ret;
 645 }
 646
 647
 648 /***********************************************************************
 649  *           set_max_limit
 650  *
 651  * Set a user limit to the maximum allowed value.
 652  */
 653 static void set_max_limit( int limit )
 654 {
 655 #ifdef HAVE_SETRLIMIT
 656     struct rlimit rlimit;
 657
 658     if (!getrlimit( limit, &rlimit ))
 659     {
 660         rlimit.rlim_cur = rlimit.rlim_max;
 661         if (setrlimit( limit, &rlimit ) != 0)
 662         {
 663 #if defined(__APPLE__) && defined(RLIMIT_NOFILE) && defined(OPEN_MAX)
 664             /* On Leopard, setrlimit(RLIMIT_NOFILE, ...) fails on attempts to set
 665              * rlim_cur above OPEN_MAX (even if rlim_max > OPEN_MAX). */
 666             if (limit == RLIMIT_NOFILE && rlimit.rlim_cur > OPEN_MAX)
 667             {
 668                 rlimit.rlim_cur = OPEN_MAX;
 669                 setrlimit( limit, &rlimit );
 670             }
 671 #endif
 672         }
 673     }
 674 #endif
 675 }
 676
 677
 678 #ifdef __APPLE__
 679 struct apple_stack_info
 680 {
 681     void *stack;
 682     size_t desired_size;
 683 };
 684
 685 /***********************************************************************
 686  *           apple_alloc_thread_stack
 687  *
 688  * Callback for wine_mmap_enum_reserved_areas to allocate space for
 689  * the secondary thread's stack.
 690  */
 691 static int apple_alloc_thread_stack( void *base, size_t size, void *arg )
 692 {
 693     struct apple_stack_info *info = arg;
 694
 695     /* For mysterious reasons, putting the thread stack at the very top
 696      * of the address space causes subsequent execs to fail, even on the
 697      * child side of a fork.  Avoid the top 16MB. */
 698     char * const limit = (char*)0xff000000;
 699     if ((char *)base >= limit) return 0;
 700     if (size > limit - (char*)base)
 701         size = limit - (char*)base;
 702     if (size < info->desired_size) return 0;
 703     info->stack = wine_anon_mmap( (char *)base + size - info->desired_size,
 704                                   info->desired_size, PROT_READ|PROT_WRITE, MAP_FIXED );
 705     return (info->stack != (void *)-1);
 706 }
 707
 708 /***********************************************************************
 709  *           apple_create_wine_thread
 710  *
 711  * Spin off a secondary thread to complete Wine initialization, leaving
 712  * the original thread for the Mac frameworks.
 713  *
 714  * Invoked as a CFRunLoopSource perform callback.
 715  */
 716 static void apple_create_wine_thread( void *init_func )
 717 {
 718     int success = 0;
 719     pthread_t thread;
 720     pthread_attr_t attr;
 721
 722     if (!pthread_attr_init( &attr ))
 723     {
 724         struct apple_stack_info info;
 725
 726         /* Try to put the new thread's stack in the reserved area.  If this
 727          * fails, just let it go wherever.  It'll be a waste of space, but we
 728          * can go on. */
 729         if (!pthread_attr_getstacksize( &attr, &info.desired_size ) &&
 730             wine_mmap_enum_reserved_areas( apple_alloc_thread_stack, &info, 1 ))
 731         {
 732             wine_mmap_remove_reserved_area( info.stack, info.desired_size, 0 );
 733             pthread_attr_setstackaddr( &attr, (char*)info.stack + info.desired_size );
 734         }
 735
 736         if (!pthread_attr_setdetachstate( &attr, PTHREAD_CREATE_JOINABLE ) &&
 737             !pthread_create( &thread, &attr, init_func, NULL ))
 738             success = 1;
 739
 740         pthread_attr_destroy( &attr );
 741     }
 742
 743     /* Failure is indicated by returning from wine_init().  Stopping
 744      * the run loop allows apple_main_thread() and thus wine_init() to
 745      * return. */
 746     if (!success)
 747         CFRunLoopStop( CFRunLoopGetCurrent() );
 748 }
 749
 750
 751 /***********************************************************************
 752  *           apple_main_thread
 753  *
 754  * Park the process's original thread in a Core Foundation run loop for
 755  * use by the Mac frameworks, especially receiving and handling
 756  * distributed notifications.  Spin off a new thread for the rest of the
 757  * Wine initialization.
 758  */
 759 static void apple_main_thread( void (*init_func)(void) )
 760 {
 761     CFRunLoopSourceContext source_context = { 0 };
 762     CFRunLoopSourceRef source;
 763
 764     /* Multi-processing Services can get confused about the main thread if the
 765      * first time it's used is on a secondary thread.  Use it here to make sure
 766      * that doesn't happen. */
 767     MPTaskIsPreemptive(MPCurrentTaskID());
 768
 769     /* Give ourselves the best chance of having the distributed notification
 770      * center scheduled on this thread's run loop.  In theory, it's scheduled
 771      * in the first thread to ask for it. */
 772     CFNotificationCenterGetDistributedCenter();
 773
 774     /* We use this run loop source for two purposes.  First, a run loop exits
 775      * if it has no more sources scheduled.  So, we need at least one source
 776      * to keep the run loop running.  Second, although it's not critical, it's
 777      * preferable for the Wine initialization to not proceed until we know
 778      * the run loop is running.  So, we signal our source immediately after
 779      * adding it and have its callback spin off the Wine thread. */
 780     source_context.info = init_func;
 781     source_context.perform = apple_create_wine_thread;
 782     source = CFRunLoopSourceCreate( NULL, 0, &source_context );
 783
 784     if (source)
 785     {
 786         CFRunLoopAddSource( CFRunLoopGetCurrent(), source, kCFRunLoopCommonModes );
 787         CFRunLoopSourceSignal( source );
 788         CFRelease( source );
 789
 790         CFRunLoopRun(); /* Should never return, except on error. */
 791     }
 792
 793     /* If we get here (i.e. return), that indicates failure to our caller. */
 794 }
 795 #endif
 796
 797
 798 /***********************************************************************
 799  *           wine_init
 800  *
 801  * Main Wine initialisation.
 802  */
 803 void wine_init( int argc, char *argv[], char *error, int error_size )
 804 {
 805     struct dll_path_context context;
 806     char *path;
 807     void *ntdll = NULL;
 808     void (*init_func)(void);
 809
 810     /* force a few limits that are set too low on some platforms */
 811 #ifdef RLIMIT_NOFILE
 812     set_max_limit( RLIMIT_NOFILE );
 813 #endif
 814 #ifdef RLIMIT_AS
 815     set_max_limit( RLIMIT_AS );
 816 #endif
 817
 818     wine_init_argv0_path( argv[0] );
 819     build_dll_path();
 820     __wine_main_argc = argc;
 821     __wine_main_argv = argv;
 822     __wine_main_environ = __wine_get_main_environment();
 823     mmap_init();
 824
 825     for (path = first_dll_path( "ntdll.dll", 0, &context ); path; path = next_dll_path( &context ))
 826     {
 827         if ((ntdll = wine_dlopen( path, RTLD_NOW, error, error_size )))
 828         {
 829             /* if we didn't use the default dll dir, remove it from the search path */
 830             if (default_dlldir[0] && context.index < nb_dll_paths + 2) nb_dll_paths--;
 831             break;
 832         }
 833     }
 834     free_dll_path( &context );
 835
 836     if (!ntdll) return;
 837     if (!(init_func = wine_dlsym( ntdll, "__wine_process_init", error, error_size ))) return;
 838 #ifdef __APPLE__
 839     apple_main_thread( init_func );
 840 #else
 841     init_func();
 842 #endif
 843 }
 844
 845
 846 /*
 847  * These functions provide wrappers around dlopen() and associated
 848  * functions.  They work around a bug in glibc 2.1.x where calling
 849  * a dl*() function after a previous dl*() function has failed
 850  * without a dlerror() call between the two will cause a crash.
 851  * They all take a pointer to a buffer that
 852  * will receive the error description (from dlerror()).  This
 853  * parameter may be NULL if the error description is not required.
 854  */
 855
 856 #ifndef RTLD_FIRST
 857 #define RTLD_FIRST 0
 858 #endif
 859
 860 /***********************************************************************
 861  *              wine_dlopen
 862  */
 863 void *wine_dlopen( const char *filename, int flag, char *error, size_t errorsize )
 864 {
 865 #ifdef HAVE_DLOPEN
 866     void *ret;
 867     const char *s;
 868
 869 #ifdef __APPLE__
 870     /* the Mac OS loader pretends to be able to load PE files, so avoid them here */
 871     unsigned char magic[2];
 872     int fd = open( filename, O_RDONLY );
 873     if (fd != -1)
 874     {
 875         if (pread( fd, magic, 2, 0 ) == 2 && magic[0] == 'M' && magic[1] == 'Z')
 876         {
 877             static const char msg[] = "MZ format";
 878             size_t len = min( errorsize, sizeof(msg) );
 879             memcpy( error, msg, len );
 880             error[len - 1] = 0;
 881             close( fd );
 882             return NULL;
 883         }
 884         close( fd );
 885     }
 886 #endif
 887     dlerror(); dlerror();
 888 #ifdef __sun
 889     if (strchr( filename, ':' ))
 890     {
 891         char path[PATH_MAX];
 892         /* Solaris' brain damaged dlopen() treats ':' as a path separator */
 893         realpath( filename, path );
 894         ret = dlopen( path, flag | RTLD_FIRST );
 895     }
 896     else
 897 #endif
 898     ret = dlopen( filename, flag | RTLD_FIRST );
 899     s = dlerror();
 900     if (error && errorsize)
 901     {
 902         if (s)
 903         {
 904             size_t len = strlen(s);
 905             if (len >= errorsize) len = errorsize - 1;
 906             memcpy( error, s, len );
 907             error[len] = 0;
 908         }
 909         else error[0] = 0;
 910     }
 911     dlerror();
 912     return ret;
 913 #else
 914     if (error)
 915     {
 916         static const char msg[] = "dlopen interface not detected by configure";
 917         size_t len = min( errorsize, sizeof(msg) );
 918         memcpy( error, msg, len );
 919         error[len - 1] = 0;
 920     }
 921     return NULL;
 922 #endif
 923 }
 924
 925 /***********************************************************************
 926  *              wine_dlsym
 927  */
 928 void *wine_dlsym( void *handle, const char *symbol, char *error, size_t errorsize )
 929 {
 930 #ifdef HAVE_DLOPEN
 931     void *ret;
 932     const char *s;
 933     dlerror(); dlerror();
 934     ret = dlsym( handle, symbol );
 935     s = dlerror();
 936     if (error && errorsize)
 937     {
 938         if (s)
 939         {
 940             size_t len = strlen(s);
 941             if (len >= errorsize) len = errorsize - 1;
 942             memcpy( error, s, len );
 943             error[len] = 0;
 944         }
 945         else error[0] = 0;
 946     }
 947     dlerror();
 948     return ret;
 949 #else
 950     if (error)
 951     {
 952         static const char msg[] = "dlopen interface not detected by configure";
 953         size_t len = min( errorsize, sizeof(msg) );
 954         memcpy( error, msg, len );
 955         error[len - 1] = 0;
 956     }
 957     return NULL;
 958 #endif
 959 }
 960
 961 /***********************************************************************
 962  *              wine_dlclose
 963  */
 964 int wine_dlclose( void *handle, char *error, size_t errorsize )
 965 {
 966 #ifdef HAVE_DLOPEN
 967     int ret;
 968     const char *s;
 969     dlerror(); dlerror();
 970     ret = dlclose( handle );
 971     s = dlerror();
 972     if (error && errorsize)
 973     {
 974         if (s)
 975         {
 976             size_t len = strlen(s);
 977             if (len >= errorsize) len = errorsize - 1;
 978             memcpy( error, s, len );
 979             error[len] = 0;
 980         }
 981         else error[0] = 0;
 982     }
 983     dlerror();
 984     return ret;
 985 #else
 986     if (error)
 987     {
 988         static const char msg[] = "dlopen interface not detected by configure";
 989         size_t len = min( errorsize, sizeof(msg) );
 990         memcpy( error, msg, len );
 991         error[len - 1] = 0;
 992     }
 993     return 1;
 994 #endif
 995 }