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