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