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 #ifdef __ANDROID__
  57 #include <jni.h>
  58 #endif
  59
  60 #define NONAMELESSUNION
  61 #define NONAMELESSSTRUCT
  62 #include "windef.h"
  63 #include "winbase.h"
  64 #include "wine/library.h"
  65
  66 #ifdef HAVE_VALGRIND_MEMCHECK_H
  67 #include <valgrind/memcheck.h>
  68 #endif
  69
  70 /* argc/argv for the Windows application */
  71 int __wine_main_argc = 0;
  72 char **__wine_main_argv = NULL;
  73 WCHAR **__wine_main_wargv = NULL;
  74 char **__wine_main_environ = NULL;
  75
  76 #ifdef __linux__
  77 #include <pthread.h>
  78 typeof(pthread_create) *call_pthread_create, *__glob_pthread_create;
  79 typeof(pthread_join) *call_pthread_join, *__glob_pthread_join;
  80 typeof(pthread_detach) *call_pthread_detach, *__glob_pthread_detach;
  81 #endif
  82
  83 struct dll_path_context
  84 {
  85     unsigned int index; /* current index in the dll path list */
  86     char *buffer;       /* buffer used for storing path names */
  87     char *name;         /* start of file name part in buffer (including leading slash) */
  88     int   namelen;      /* length of file name without .so extension */
  89     int   win16;        /* 16-bit dll search */
  90 };
  91
  92 #define MAX_DLLS 100
  93
  94 static struct
  95 {
  96     const IMAGE_NT_HEADERS *nt;           /* NT header */
  97     const char             *filename;     /* DLL file name */
  98 } builtin_dlls[MAX_DLLS];
  99
 100 static int nb_dlls;
 101
 102 static const IMAGE_NT_HEADERS *main_exe;
 103
 104 static load_dll_callback_t load_dll_callback;
 105
 106 static const char *build_dir;
 107 static const char *default_dlldir;
 108 static const char **dll_paths;
 109 static unsigned int nb_dll_paths;
 110 static int dll_path_maxlen;
 111
 112 extern void mmap_init(void);
 113 extern const char *get_dlldir( const char **default_dlldir );
 114
 115 /* build the dll load path from the WINEDLLPATH variable */
 116 static void build_dll_path(void)
 117 {
 118     int len, count = 0;
 119     char *p, *path = getenv( "WINEDLLPATH" );
 120     const char *dlldir = get_dlldir( &default_dlldir );
 121
 122     if (path)
 123     {
 124         /* count how many path elements we need */
 125         path = strdup(path);
 126         p = path;
 127         while (*p)
 128         {
 129             while (*p == ':') p++;
 130             if (!*p) break;
 131             count++;
 132             while (*p && *p != ':') p++;
 133         }
 134     }
 135
 136     dll_paths = malloc( (count+2) * sizeof(*dll_paths) );
 137     nb_dll_paths = 0;
 138
 139     if (dlldir)
 140     {
 141         dll_path_maxlen = strlen(dlldir);
 142         dll_paths[nb_dll_paths++] = dlldir;
 143     }
 144     else if ((build_dir = wine_get_build_dir()))
 145     {
 146         dll_path_maxlen = strlen(build_dir) + sizeof("/programs");
 147     }
 148
 149     if (count)
 150     {
 151         p = path;
 152         while (*p)
 153         {
 154             while (*p == ':') *p++ = 0;
 155             if (!*p) break;
 156             dll_paths[nb_dll_paths] = p;
 157             while (*p && *p != ':') p++;
 158             if (p - dll_paths[nb_dll_paths] > dll_path_maxlen)
 159                 dll_path_maxlen = p - dll_paths[nb_dll_paths];
 160             nb_dll_paths++;
 161         }
 162     }
 163
 164     /* append default dll dir (if not empty) to path */
 165     if ((len = strlen(default_dlldir)) > 0)
 166     {
 167         if (len > dll_path_maxlen) dll_path_maxlen = len;
 168         dll_paths[nb_dll_paths++] = default_dlldir;
 169     }
 170 }
 171
 172 /* check if the library is the correct architecture */
 173 /* only returns false for a valid library of the wrong arch */
 174 static int check_library_arch( int fd )
 175 {
 176 #ifdef __APPLE__
 177     struct  /* Mach-O header */
 178     {
 179         unsigned int magic;
 180         unsigned int cputype;
 181     } header;
 182
 183     if (read( fd, &header, sizeof(header) ) != sizeof(header)) return 1;
 184     if (header.magic != 0xfeedface) return 1;
 185     if (sizeof(void *) == sizeof(int)) return !(header.cputype >> 24);
 186     else return (header.cputype >> 24) == 1; /* CPU_ARCH_ABI64 */
 187 #else
 188     struct  /* ELF header */
 189     {
 190         unsigned char magic[4];
 191         unsigned char class;
 192         unsigned char data;
 193         unsigned char version;
 194     } header;
 195
 196     if (read( fd, &header, sizeof(header) ) != sizeof(header)) return 1;
 197     if (memcmp( header.magic, "\177ELF", 4 )) return 1;
 198     if (header.version != 1 /* EV_CURRENT */) return 1;
 199 #ifdef WORDS_BIGENDIAN
 200     if (header.data != 2 /* ELFDATA2MSB */) return 1;
 201 #else
 202     if (header.data != 1 /* ELFDATA2LSB */) return 1;
 203 #endif
 204     if (sizeof(void *) == sizeof(int)) return header.class == 1; /* ELFCLASS32 */
 205     else return header.class == 2; /* ELFCLASS64 */
 206 #endif
 207 }
 208
 209 /* check if a given file can be opened */
 210 static inline int file_exists( const char *name )
 211 {
 212     int ret = 0;
 213     int fd = open( name, O_RDONLY );
 214     if (fd != -1)
 215     {
 216         ret = check_library_arch( fd );
 217         close( fd );
 218     }
 219     return ret;
 220 }
 221
 222 static inline char *prepend( char *buffer, const char *str, size_t len )
 223 {
 224     return memcpy( buffer - len, str, len );
 225 }
 226
 227 /* get a filename from the next entry in the dll path */
 228 static char *next_dll_path( struct dll_path_context *context )
 229 {
 230     unsigned int index = context->index++;
 231     int namelen = context->namelen;
 232     char *path = context->name;
 233
 234     switch(index)
 235     {
 236     case 0:  /* try dlls dir with subdir prefix */
 237         if (namelen > 4 && !memcmp( context->name + namelen - 4, ".dll", 4 )) namelen -= 4;
 238         if (!context->win16) path = prepend( path, context->name, namelen );
 239         path = prepend( path, "/dlls", sizeof("/dlls") - 1 );
 240         path = prepend( path, build_dir, strlen(build_dir) );
 241         return path;
 242     case 1:  /* try programs dir with subdir prefix */
 243         if (!context->win16)
 244         {
 245             if (namelen > 4 && !memcmp( context->name + namelen - 4, ".exe", 4 )) namelen -= 4;
 246             path = prepend( path, context->name, namelen );
 247             path = prepend( path, "/programs", sizeof("/programs") - 1 );
 248             path = prepend( path, build_dir, strlen(build_dir) );
 249             return path;
 250         }
 251         context->index++;
 252         /* fall through */
 253     default:
 254         index -= 2;
 255         if (index >= nb_dll_paths) return NULL;
 256         path = prepend( path, dll_paths[index], strlen( dll_paths[index] ));
 257         return path;
 258     }
 259 }
 260
 261
 262 /* get a filename from the first entry in the dll path */
 263 static char *first_dll_path( const char *name, int win16, struct dll_path_context *context )
 264 {
 265     char *p;
 266     int namelen = strlen( name );
 267     const char *ext = win16 ? "16" : ".so";
 268
 269     context->buffer = malloc( dll_path_maxlen + 2 * namelen + strlen(ext) + 3 );
 270     context->index = build_dir ? 0 : 2;  /* if no build dir skip all the build dir magic cases */
 271     context->name = context->buffer + dll_path_maxlen + namelen + 1;
 272     context->namelen = namelen + 1;
 273     context->win16 = win16;
 274
 275     /* store the name at the end of the buffer, followed by extension */
 276     p = context->name;
 277     *p++ = '/';
 278     memcpy( p, name, namelen );
 279     strcpy( p + namelen, ext );
 280     return next_dll_path( context );
 281 }
 282
 283
 284 /* free the dll path context created by first_dll_path */
 285 static inline void free_dll_path( struct dll_path_context *context )
 286 {
 287     free( context->buffer );
 288 }
 289
 290
 291 /* open a library for a given dll, searching in the dll path
 292  * 'name' must be the Windows dll name (e.g. "kernel32.dll") */
 293 static void *dlopen_dll( const char *name, char *error, int errorsize,
 294                          int test_only, int *exists )
 295 {
 296     struct dll_path_context context;
 297     char *path;
 298     void *ret = NULL;
 299
 300     *exists = 0;
 301     for (path = first_dll_path( name, 0, &context ); path; path = next_dll_path( &context ))
 302     {
 303         if (!test_only && (ret = wine_dlopen( path, RTLD_NOW, error, errorsize ))) break;
 304         if ((*exists = file_exists( path ))) break; /* exists but cannot be loaded, return the error */
 305     }
 306     free_dll_path( &context );
 307     return ret;
 308 }
 309
 310
 311 /* adjust an array of pointers to make them into RVAs */
 312 static inline void fixup_rva_ptrs( void *array, BYTE *base, unsigned int count )
 313 {
 314     void **src = (void **)array;
 315     DWORD *dst = (DWORD *)array;
 316     while (count--)
 317     {
 318         *dst++ = *src ? (BYTE *)*src - base : 0;
 319         src++;
 320     }
 321 }
 322
 323 /* fixup an array of RVAs by adding the specified delta */
 324 static inline void fixup_rva_dwords( DWORD *ptr, int delta, unsigned int count )
 325 {
 326     while (count--)
 327     {
 328         if (*ptr) *ptr += delta;
 329         ptr++;
 330     }
 331 }
 332
 333
 334 /* fixup RVAs in the import directory */
 335 static void fixup_imports( IMAGE_IMPORT_DESCRIPTOR *dir, BYTE *base, int delta )
 336 {
 337     UINT_PTR *ptr;
 338
 339     while (dir->Name)
 340     {
 341         fixup_rva_dwords( &dir->u.OriginalFirstThunk, delta, 1 );
 342         fixup_rva_dwords( &dir->Name, delta, 1 );
 343         fixup_rva_dwords( &dir->FirstThunk, delta, 1 );
 344         ptr = (UINT_PTR *)(base + (dir->u.OriginalFirstThunk ? dir->u.OriginalFirstThunk : dir->FirstThunk));
 345         while (*ptr)
 346         {
 347             if (!(*ptr & IMAGE_ORDINAL_FLAG)) *ptr += delta;
 348             ptr++;
 349         }
 350         dir++;
 351     }
 352 }
 353
 354
 355 /* fixup RVAs in the export directory */
 356 static void fixup_exports( IMAGE_EXPORT_DIRECTORY *dir, BYTE *base, int delta )
 357 {
 358     fixup_rva_dwords( &dir->Name, delta, 1 );
 359     fixup_rva_dwords( &dir->AddressOfFunctions, delta, 1 );
 360     fixup_rva_dwords( &dir->AddressOfNames, delta, 1 );
 361     fixup_rva_dwords( &dir->AddressOfNameOrdinals, delta, 1 );
 362     fixup_rva_dwords( (DWORD *)(base + dir->AddressOfNames), delta, dir->NumberOfNames );
 363     fixup_rva_ptrs( (base + dir->AddressOfFunctions), base, dir->NumberOfFunctions );
 364 }
 365
 366
 367 /* fixup RVAs in the resource directory */
 368 static void fixup_resources( IMAGE_RESOURCE_DIRECTORY *dir, BYTE *root, int delta )
 369 {
 370     IMAGE_RESOURCE_DIRECTORY_ENTRY *entry;
 371     int i;
 372
 373     entry = (IMAGE_RESOURCE_DIRECTORY_ENTRY *)(dir + 1);
 374     for (i = 0; i < dir->NumberOfNamedEntries + dir->NumberOfIdEntries; i++, entry++)
 375     {
 376         void *ptr = root + entry->u2.s2.OffsetToDirectory;
 377         if (entry->u2.s2.DataIsDirectory) fixup_resources( ptr, root, delta );
 378         else
 379         {
 380             IMAGE_RESOURCE_DATA_ENTRY *data = ptr;
 381             fixup_rva_dwords( &data->OffsetToData, delta, 1 );
 382         }
 383     }
 384 }
 385
 386
 387 /* map a builtin dll in memory and fixup RVAs */
 388 static void *map_dll( const IMAGE_NT_HEADERS *nt_descr )
 389 {
 390 #ifdef HAVE_MMAP
 391     IMAGE_DATA_DIRECTORY *dir;
 392     IMAGE_DOS_HEADER *dos;
 393     IMAGE_NT_HEADERS *nt;
 394     IMAGE_SECTION_HEADER *sec;
 395     BYTE *addr;
 396     DWORD code_start, data_start, data_end;
 397     const size_t page_size = sysconf( _SC_PAGESIZE );
 398     const size_t page_mask = page_size - 1;
 399     int delta, nb_sections = 2;  /* code + data */
 400     unsigned int i;
 401
 402     size_t size = (sizeof(IMAGE_DOS_HEADER)
 403                    + sizeof(IMAGE_NT_HEADERS)
 404                    + nb_sections * sizeof(IMAGE_SECTION_HEADER));
 405
 406     assert( size <= page_size );
 407
 408     /* module address must be aligned on 64K boundary */
 409     addr = (BYTE *)((nt_descr->OptionalHeader.ImageBase + 0xffff) & ~0xffff);
 410     if (wine_anon_mmap( addr, page_size, PROT_READ|PROT_WRITE, MAP_FIXED ) != addr) return NULL;
 411
 412     dos    = (IMAGE_DOS_HEADER *)addr;
 413     nt     = (IMAGE_NT_HEADERS *)(dos + 1);
 414     sec    = (IMAGE_SECTION_HEADER *)(nt + 1);
 415
 416     /* Build the DOS and NT headers */
 417
 418     dos->e_magic    = IMAGE_DOS_SIGNATURE;
 419     dos->e_cblp     = 0x90;
 420     dos->e_cp       = 3;
 421     dos->e_cparhdr  = (sizeof(*dos)+0xf)/0x10;
 422     dos->e_minalloc = 0;
 423     dos->e_maxalloc = 0xffff;
 424     dos->e_ss       = 0x0000;
 425     dos->e_sp       = 0x00b8;
 426     dos->e_lfarlc   = sizeof(*dos);
 427     dos->e_lfanew   = sizeof(*dos);
 428
 429     *nt = *nt_descr;
 430
 431     delta      = (const BYTE *)nt_descr - addr;
 432     code_start = page_size;
 433     data_start = delta & ~page_mask;
 434     data_end   = (nt->OptionalHeader.SizeOfImage + delta + page_mask) & ~page_mask;
 435
 436     fixup_rva_ptrs( &nt->OptionalHeader.AddressOfEntryPoint, addr, 1 );
 437
 438     nt->FileHeader.NumberOfSections                = nb_sections;
 439     nt->OptionalHeader.BaseOfCode                  = code_start;
 440 #ifndef _WIN64
 441     nt->OptionalHeader.BaseOfData                  = data_start;
 442 #endif
 443     nt->OptionalHeader.SizeOfCode                  = data_start - code_start;
 444     nt->OptionalHeader.SizeOfInitializedData       = data_end - data_start;
 445     nt->OptionalHeader.SizeOfUninitializedData     = 0;
 446     nt->OptionalHeader.SizeOfImage                 = data_end;
 447     nt->OptionalHeader.ImageBase                   = (ULONG_PTR)addr;
 448
 449     /* Build the code section */
 450
 451     memcpy( sec->Name, ".text", sizeof(".text") );
 452     sec->SizeOfRawData = data_start - code_start;
 453     sec->Misc.VirtualSize = sec->SizeOfRawData;
 454     sec->VirtualAddress   = code_start;
 455     sec->PointerToRawData = code_start;
 456     sec->Characteristics  = (IMAGE_SCN_CNT_CODE | IMAGE_SCN_MEM_EXECUTE | IMAGE_SCN_MEM_READ);
 457     sec++;
 458
 459     /* Build the data section */
 460
 461     memcpy( sec->Name, ".data", sizeof(".data") );
 462     sec->SizeOfRawData = data_end - data_start;
 463     sec->Misc.VirtualSize = sec->SizeOfRawData;
 464     sec->VirtualAddress   = data_start;
 465     sec->PointerToRawData = data_start;
 466     sec->Characteristics  = (IMAGE_SCN_CNT_INITIALIZED_DATA |
 467                              IMAGE_SCN_MEM_WRITE | IMAGE_SCN_MEM_READ);
 468     sec++;
 469
 470     for (i = 0; i < nt->OptionalHeader.NumberOfRvaAndSizes; i++)
 471         fixup_rva_dwords( &nt->OptionalHeader.DataDirectory[i].VirtualAddress, delta, 1 );
 472
 473     /* Build the import directory */
 474
 475     dir = &nt->OptionalHeader.DataDirectory[IMAGE_FILE_IMPORT_DIRECTORY];
 476     if (dir->Size)
 477     {
 478         IMAGE_IMPORT_DESCRIPTOR *imports = (void *)(addr + dir->VirtualAddress);
 479         fixup_imports( imports, addr, delta );
 480     }
 481
 482     /* Build the resource directory */
 483
 484     dir = &nt->OptionalHeader.DataDirectory[IMAGE_FILE_RESOURCE_DIRECTORY];
 485     if (dir->Size)
 486     {
 487         void *ptr = (void *)(addr + dir->VirtualAddress);
 488         fixup_resources( ptr, ptr, delta );
 489     }
 490
 491     /* Build the export directory */
 492
 493     dir = &nt->OptionalHeader.DataDirectory[IMAGE_FILE_EXPORT_DIRECTORY];
 494     if (dir->Size)
 495     {
 496         IMAGE_EXPORT_DIRECTORY *exports = (void *)(addr + dir->VirtualAddress);
 497         fixup_exports( exports, addr, delta );
 498     }
 499     return addr;
 500 #else  /* HAVE_MMAP */
 501     return NULL;
 502 #endif  /* HAVE_MMAP */
 503 }
 504
 505
 506 /***********************************************************************
 507  *           __wine_get_main_environment
 508  *
 509  * Return an environment pointer to work around lack of environ variable.
 510  * Only exported on Mac OS.
 511  */
 512 char **__wine_get_main_environment(void)
 513 {
 514     return environ;
 515 }
 516
 517
 518 /***********************************************************************
 519  *           __wine_dll_register
 520  *
 521  * Register a built-in DLL descriptor.
 522  */
 523 void __wine_dll_register( const IMAGE_NT_HEADERS *header, const char *filename )
 524 {
 525     if (load_dll_callback) load_dll_callback( map_dll(header), filename );
 526     else
 527     {
 528         if (!(header->FileHeader.Characteristics & IMAGE_FILE_DLL))
 529             main_exe = header;
 530         else
 531         {
 532             assert( nb_dlls < MAX_DLLS );
 533             builtin_dlls[nb_dlls].nt = header;
 534             builtin_dlls[nb_dlls].filename = filename;
 535             nb_dlls++;
 536         }
 537     }
 538 }
 539
 540
 541 /***********************************************************************
 542  *           wine_dll_set_callback
 543  *
 544  * Set the callback function for dll loading, and call it
 545  * for all dlls that were implicitly loaded already.
 546  */
 547 void wine_dll_set_callback( load_dll_callback_t load )
 548 {
 549     int i;
 550     load_dll_callback = load;
 551     for (i = 0; i < nb_dlls; i++)
 552     {
 553         const IMAGE_NT_HEADERS *nt = builtin_dlls[i].nt;
 554         if (!nt) continue;
 555         builtin_dlls[i].nt = NULL;
 556         load_dll_callback( map_dll(nt), builtin_dlls[i].filename );
 557     }
 558     nb_dlls = 0;
 559     if (main_exe) load_dll_callback( map_dll(main_exe), "" );
 560 }
 561
 562
 563 /***********************************************************************
 564  *           wine_dll_load
 565  *
 566  * Load a builtin dll.
 567  */
 568 void *wine_dll_load( const char *filename, char *error, int errorsize, int *file_exists )
 569 {
 570     int i;
 571
 572     /* callback must have been set already */
 573     assert( load_dll_callback );
 574
 575     /* check if we have it in the list */
 576     /* this can happen when initializing pre-loaded dlls in wine_dll_set_callback */
 577     for (i = 0; i < nb_dlls; i++)
 578     {
 579         if (!builtin_dlls[i].nt) continue;
 580         if (!strcmp( builtin_dlls[i].filename, filename ))
 581         {
 582             const IMAGE_NT_HEADERS *nt = builtin_dlls[i].nt;
 583             builtin_dlls[i].nt = NULL;
 584             load_dll_callback( map_dll(nt), builtin_dlls[i].filename );
 585             *file_exists = 1;
 586             return (void *)1;
 587         }
 588     }
 589     return dlopen_dll( filename, error, errorsize, 0, file_exists );
 590 }
 591
 592
 593 /***********************************************************************
 594  *           wine_dll_unload
 595  *
 596  * Unload a builtin dll.
 597  */
 598 void wine_dll_unload( void *handle )
 599 {
 600     if (handle != (void *)1)
 601         wine_dlclose( handle, NULL, 0 );
 602 }
 603
 604
 605 /***********************************************************************
 606  *           wine_dll_load_main_exe
 607  *
 608  * Try to load the .so for the main exe.
 609  */
 610 void *wine_dll_load_main_exe( const char *name, char *error, int errorsize,
 611                               int test_only, int *file_exists )
 612 {
 613     return dlopen_dll( name, error, errorsize, test_only, file_exists );
 614 }
 615
 616
 617 /***********************************************************************
 618  *           wine_dll_enum_load_path
 619  *
 620  * Enumerate the dll load path.
 621  */
 622 const char *wine_dll_enum_load_path( unsigned int index )
 623 {
 624     if (index >= nb_dll_paths) return NULL;
 625     return dll_paths[index];
 626 }
 627
 628
 629 /***********************************************************************
 630  *           wine_dll_get_owner
 631  *
 632  * Retrieve the name of the 32-bit owner dll for a 16-bit dll.
 633  * Return 0 if OK, -1 on error.
 634  */
 635 int wine_dll_get_owner( const char *name, char *buffer, int size, int *exists )
 636 {
 637     int ret = -1;
 638     char *path;
 639     struct dll_path_context context;
 640
 641     *exists = 0;
 642
 643     for (path = first_dll_path( name, 1, &context ); path; path = next_dll_path( &context ))
 644     {
 645         int fd = open( path, O_RDONLY );
 646         if (fd != -1)
 647         {
 648             int res = read( fd, buffer, size - 1 );
 649             while (res > 0 && (buffer[res-1] == '\n' || buffer[res-1] == '\r')) res--;
 650             buffer[res] = 0;
 651             close( fd );
 652             *exists = 1;
 653             ret = 0;
 654             break;
 655         }
 656     }
 657     free_dll_path( &context );
 658     return ret;
 659 }
 660
 661 /***********************************************************************
 662  *           set_max_limit
 663  *
 664  * Set a user limit to the maximum allowed value.
 665  */
 666 static void set_max_limit( int limit )
 667 {
 668 #ifdef HAVE_SETRLIMIT
 669     struct rlimit rlimit;
 670
 671 #if defined(RLIMIT_NOFILE) && defined(RUNNING_ON_VALGRIND)
 672     if (limit == RLIMIT_NOFILE && RUNNING_ON_VALGRIND)
 673         return;
 674 #endif
 675
 676     if (!getrlimit( limit, &rlimit ))
 677     {
 678         rlimit.rlim_cur = rlimit.rlim_max;
 679         if (setrlimit( limit, &rlimit ) != 0)
 680         {
 681 #if defined(__APPLE__) && defined(RLIMIT_NOFILE) && defined(OPEN_MAX)
 682             /* On Leopard, setrlimit(RLIMIT_NOFILE, ...) fails on attempts to set
 683              * rlim_cur above OPEN_MAX (even if rlim_max > OPEN_MAX). */
 684             if (limit == RLIMIT_NOFILE && rlimit.rlim_cur > OPEN_MAX)
 685             {
 686                 rlimit.rlim_cur = OPEN_MAX;
 687                 setrlimit( limit, &rlimit );
 688             }
 689 #endif
 690         }
 691     }
 692 #endif
 693 }
 694
 695
 696 #ifdef __APPLE__
 697 struct apple_stack_info
 698 {
 699     void *stack;
 700     size_t desired_size;
 701 };
 702
 703 /***********************************************************************
 704  *           apple_alloc_thread_stack
 705  *
 706  * Callback for wine_mmap_enum_reserved_areas to allocate space for
 707  * the secondary thread's stack.
 708  */
 709 static int apple_alloc_thread_stack( void *base, size_t size, void *arg )
 710 {
 711     struct apple_stack_info *info = arg;
 712
 713     /* For mysterious reasons, putting the thread stack at the very top
 714      * of the address space causes subsequent execs to fail, even on the
 715      * child side of a fork.  Avoid the top 16MB. */
 716     char * const limit = (char*)0xff000000;
 717     if ((char *)base >= limit) return 0;
 718     if (size > limit - (char*)base)
 719         size = limit - (char*)base;
 720     if (size < info->desired_size) return 0;
 721     info->stack = wine_anon_mmap( (char *)base + size - info->desired_size,
 722                                   info->desired_size, PROT_READ|PROT_WRITE, MAP_FIXED );
 723     return (info->stack != (void *)-1);
 724 }
 725
 726 /***********************************************************************
 727  *           apple_create_wine_thread
 728  *
 729  * Spin off a secondary thread to complete Wine initialization, leaving
 730  * the original thread for the Mac frameworks.
 731  *
 732  * Invoked as a CFRunLoopSource perform callback.
 733  */
 734 static void apple_create_wine_thread( void *init_func )
 735 {
 736     int success = 0;
 737     pthread_t thread;
 738     pthread_attr_t attr;
 739
 740     if (!pthread_attr_init( &attr ))
 741     {
 742         struct apple_stack_info info;
 743
 744         /* Try to put the new thread's stack in the reserved area.  If this
 745          * fails, just let it go wherever.  It'll be a waste of space, but we
 746          * can go on. */
 747         if (!pthread_attr_getstacksize( &attr, &info.desired_size ) &&
 748             wine_mmap_enum_reserved_areas( apple_alloc_thread_stack, &info, 1 ))
 749         {
 750             wine_mmap_remove_reserved_area( info.stack, info.desired_size, 0 );
 751             pthread_attr_setstackaddr( &attr, (char*)info.stack + info.desired_size );
 752         }
 753
 754         if (!pthread_attr_setdetachstate( &attr, PTHREAD_CREATE_JOINABLE ) &&
 755             !pthread_create( &thread, &attr, init_func, NULL ))
 756             success = 1;
 757
 758         pthread_attr_destroy( &attr );
 759     }
 760
 761     /* Failure is indicated by returning from wine_init().  Stopping
 762      * the run loop allows apple_main_thread() and thus wine_init() to
 763      * return. */
 764     if (!success)
 765         CFRunLoopStop( CFRunLoopGetCurrent() );
 766 }
 767
 768
 769 /***********************************************************************
 770  *           apple_main_thread
 771  *
 772  * Park the process's original thread in a Core Foundation run loop for
 773  * use by the Mac frameworks, especially receiving and handling
 774  * distributed notifications.  Spin off a new thread for the rest of the
 775  * Wine initialization.
 776  */
 777 static void apple_main_thread( void (*init_func)(void) )
 778 {
 779     CFRunLoopSourceContext source_context = { 0 };
 780     CFRunLoopSourceRef source;
 781
 782     if (!pthread_main_np())
 783     {
 784         init_func();
 785         return;
 786     }
 787
 788     /* Multi-processing Services can get confused about the main thread if the
 789      * first time it's used is on a secondary thread.  Use it here to make sure
 790      * that doesn't happen. */
 791     MPTaskIsPreemptive(MPCurrentTaskID());
 792
 793     /* Give ourselves the best chance of having the distributed notification
 794      * center scheduled on this thread's run loop.  In theory, it's scheduled
 795      * in the first thread to ask for it. */
 796     CFNotificationCenterGetDistributedCenter();
 797
 798     /* We use this run loop source for two purposes.  First, a run loop exits
 799      * if it has no more sources scheduled.  So, we need at least one source
 800      * to keep the run loop running.  Second, although it's not critical, it's
 801      * preferable for the Wine initialization to not proceed until we know
 802      * the run loop is running.  So, we signal our source immediately after
 803      * adding it and have its callback spin off the Wine thread. */
 804     source_context.info = init_func;
 805     source_context.perform = apple_create_wine_thread;
 806     source = CFRunLoopSourceCreate( NULL, 0, &source_context );
 807
 808     if (source)
 809     {
 810         CFRunLoopAddSource( CFRunLoopGetCurrent(), source, kCFRunLoopCommonModes );
 811         CFRunLoopSourceSignal( source );
 812         CFRelease( source );
 813
 814         CFRunLoopRun(); /* Should never return, except on error. */
 815     }
 816
 817     /* If we get here (i.e. return), that indicates failure to our caller. */
 818 }
 819 #endif
 820
 821
 822 #ifdef __ANDROID__
 823
 824 #ifndef WINE_JAVA_CLASS
 825 #define WINE_JAVA_CLASS "org/winehq/wine/WineActivity"
 826 #endif
 827
 828 static JavaVM *java_vm;
 829 static jobject java_object;
 830
 831 /* return the Java VM that was used for JNI initialisation */
 832 JavaVM *wine_get_java_vm(void)
 833 {
 834     return java_vm;
 835 }
 836
 837 /* return the Java object that called the wine_init method */
 838 jobject wine_get_java_object(void)
 839 {
 840     return java_object;
 841 }
 842
 843 /* main Wine initialisation */
 844 static jstring wine_init_jni( JNIEnv *env, jobject obj, jobjectArray cmdline, jobjectArray environment )
 845 {
 846     char **argv;
 847     char *str;
 848     char error[1024];
 849     int i, argc, length;
 850
 851     /* get the command line array */
 852
 853     argc = (*env)->GetArrayLength( env, cmdline );
 854     for (i = length = 0; i < argc; i++)
 855     {
 856         jobject str_obj = (*env)->GetObjectArrayElement( env, cmdline, i );
 857         length += (*env)->GetStringUTFLength( env, str_obj ) + 1;
 858     }
 859
 860     argv = malloc( (argc + 1) * sizeof(*argv) + length );
 861     str = (char *)(argv + argc + 1);
 862     for (i = 0; i < argc; i++)
 863     {
 864         jobject str_obj = (*env)->GetObjectArrayElement( env, cmdline, i );
 865         length = (*env)->GetStringUTFLength( env, str_obj );
 866         (*env)->GetStringUTFRegion( env, str_obj, 0,
 867                                     (*env)->GetStringLength( env, str_obj ), str );
 868         argv[i] = str;
 869         str[length] = 0;
 870         str += length + 1;
 871     }
 872     argv[argc] = NULL;
 873
 874     /* set the environment variables */
 875
 876     if (environment)
 877     {
 878         int count = (*env)->GetArrayLength( env, environment );
 879         for (i = 0; i < count - 1; i += 2)
 880         {
 881             jobject var_obj = (*env)->GetObjectArrayElement( env, environment, i );
 882             jobject val_obj = (*env)->GetObjectArrayElement( env, environment, i + 1 );
 883             const char *var = (*env)->GetStringUTFChars( env, var_obj, NULL );
 884
 885             if (val_obj)
 886             {
 887                 const char *val = (*env)->GetStringUTFChars( env, val_obj, NULL );
 888                 setenv( var, val, 1 );
 889                 if (!strcmp( var, "LD_LIBRARY_PATH" ))
 890                 {
 891                     void (*update_func)( const char * ) = dlsym( RTLD_DEFAULT,
 892                                                                  "android_update_LD_LIBRARY_PATH" );
 893                     if (update_func) update_func( val );
 894                 }
 895                 (*env)->ReleaseStringUTFChars( env, val_obj, val );
 896             }
 897             else unsetenv( var );
 898
 899             (*env)->ReleaseStringUTFChars( env, var_obj, var );
 900         }
 901     }
 902
 903     java_object = (*env)->NewGlobalRef( env, obj );
 904
 905     wine_init( argc, argv, error, sizeof(error) );
 906     return (*env)->NewStringUTF( env, error );
 907 }
 908
 909 jint JNI_OnLoad( JavaVM *vm, void *reserved )
 910 {
 911     static const JNINativeMethod method =
 912     {
 913         "wine_init", "([Ljava/lang/String;[Ljava/lang/String;)Ljava/lang/String;", wine_init_jni
 914     };
 915
 916     JNIEnv *env;
 917     jclass class;
 918
 919     java_vm = vm;
 920     if ((*vm)->AttachCurrentThread( vm, &env, NULL ) != JNI_OK) return JNI_ERR;
 921     if (!(class = (*env)->FindClass( env, WINE_JAVA_CLASS ))) return JNI_ERR;
 922     (*env)->RegisterNatives( env, class, &method, 1 );
 923     return JNI_VERSION_1_6;
 924 }
 925
 926 #endif  /* __ANDROID__ */
 927
 928 /***********************************************************************
 929  *           set_rttime_limit
 930  *
 931  * set a limit on the cpu time used
 932  */
 933 static void set_rttime_limit(void)
 934 {
 935 #if defined(HAVE_SETRLIMIT) && defined(__linux__)
 936 #ifndef RLIMIT_RTTIME
 937 #define RLIMIT_RTTIME 15
 938 #endif
 939     struct rlimit rlimit;
 940
 941     if (!getrlimit( RLIMIT_RTTIME, &rlimit ))
 942     {
 943         /* 1000 ms maximum realtime before the first SIGXCPU, this will drop
 944          * all realtime threads to normal priority.
 945          */
 946         if (rlimit.rlim_max > 5000000)
 947             rlimit.rlim_max = 5000000;
 948         rlimit.rlim_cur = 1000000;
 949
 950         setrlimit( RLIMIT_RTTIME, &rlimit );
 951     }
 952 #endif
 953 }
 954
 955
 956 /***********************************************************************
 957  *           wine_init
 958  *
 959  * Main Wine initialisation.
 960  */
 961 void wine_init( int argc, char *argv[], char *error, int error_size )
 962 {
 963     struct dll_path_context context;
 964     char *path;
 965     void *ntdll = NULL;
 966     void (*init_func)(void);
 967
 968     /* force a few limits that are set too low on some platforms */
 969 #ifdef RLIMIT_NOFILE
 970     set_max_limit( RLIMIT_NOFILE );
 971 #endif
 972 #ifdef RLIMIT_AS
 973     set_max_limit( RLIMIT_AS );
 974 #endif
 975     set_rttime_limit();
 976
 977     wine_init_argv0_path( argv[0] );
 978     build_dll_path();
 979     __wine_main_argc = argc;
 980     __wine_main_argv = argv;
 981     __wine_main_environ = __wine_get_main_environment();
 982     mmap_init();
 983
 984     for (path = first_dll_path( "ntdll.dll", 0, &context ); path; path = next_dll_path( &context ))
 985     {
 986         if ((ntdll = wine_dlopen( path, RTLD_NOW, error, error_size )))
 987         {
 988             /* if we didn't use the default dll dir, remove it from the search path */
 989             if (default_dlldir[0] && context.index < nb_dll_paths + 2) nb_dll_paths--;
 990             break;
 991         }
 992     }
 993     free_dll_path( &context );
 994
 995     if (!ntdll) return;
 996     if (!(init_func = wine_dlsym( ntdll, "__wine_process_init", error, error_size ))) return;
 997 #ifdef __APPLE__
 998     apple_main_thread( init_func );
 999 #else
1000     init_func();
1001 #endif
1002 }
1003
1004
1005 /*
1006  * These functions provide wrappers around dlopen() and associated
1007  * functions.  They work around a bug in glibc 2.1.x where calling
1008  * a dl*() function after a previous dl*() function has failed
1009  * without a dlerror() call between the two will cause a crash.
1010  * They all take a pointer to a buffer that
1011  * will receive the error description (from dlerror()).  This
1012  * parameter may be NULL if the error description is not required.
1013  */
1014
1015 #ifndef RTLD_FIRST
1016 #define RTLD_FIRST 0
1017 #endif
1018
1019 /***********************************************************************
1020  *              wine_dlopen
1021  */
1022 void *wine_dlopen( const char *filename, int flag, char *error, size_t errorsize )
1023 {
1024 #ifdef HAVE_DLOPEN
1025     void *ret;
1026     const char *s;
1027
1028 #ifdef __APPLE__
1029     /* the Mac OS loader pretends to be able to load PE files, so avoid them here */
1030     unsigned char magic[2];
1031     int fd = open( filename, O_RDONLY );
1032     if (fd != -1)
1033     {
1034         if (pread( fd, magic, 2, 0 ) == 2 && magic[0] == 'M' && magic[1] == 'Z')
1035         {
1036             if (error && errorsize)
1037             {
1038                 static const char msg[] = "MZ format";
1039                 size_t len = min( errorsize, sizeof(msg) );
1040                 memcpy( error, msg, len );
1041                 error[len - 1] = 0;
1042             }
1043             close( fd );
1044             return NULL;
1045         }
1046         close( fd );
1047     }
1048 #endif
1049     dlerror(); dlerror();
1050 #ifdef __sun
1051     if (strchr( filename, ':' ))
1052     {
1053         char path[PATH_MAX];
1054         /* Solaris' brain damaged dlopen() treats ':' as a path separator */
1055         realpath( filename, path );
1056         ret = dlopen( path, flag | RTLD_FIRST );
1057     }
1058     else
1059 #endif
1060     ret = dlopen( filename, flag | RTLD_FIRST );
1061     s = dlerror();
1062     if (error && errorsize)
1063     {
1064         if (s)
1065         {
1066             size_t len = strlen(s);
1067             if (len >= errorsize) len = errorsize - 1;
1068             memcpy( error, s, len );
1069             error[len] = 0;
1070         }
1071         else error[0] = 0;
1072     }
1073     dlerror();
1074     return ret;
1075 #else
1076     if (error)
1077     {
1078         static const char msg[] = "dlopen interface not detected by configure";
1079         size_t len = min( errorsize, sizeof(msg) );
1080         memcpy( error, msg, len );
1081         error[len - 1] = 0;
1082     }
1083     return NULL;
1084 #endif
1085 }
1086
1087 /***********************************************************************
1088  *              wine_dlsym
1089  */
1090 void *wine_dlsym( void *handle, const char *symbol, char *error, size_t errorsize )
1091 {
1092 #ifdef HAVE_DLOPEN
1093     void *ret;
1094     const char *s;
1095     dlerror(); dlerror();
1096     ret = dlsym( handle, symbol );
1097     s = dlerror();
1098     if (error && errorsize)
1099     {
1100         if (s)
1101         {
1102             size_t len = strlen(s);
1103             if (len >= errorsize) len = errorsize - 1;
1104             memcpy( error, s, len );
1105             error[len] = 0;
1106         }
1107         else error[0] = 0;
1108     }
1109     dlerror();
1110     return ret;
1111 #else
1112     if (error)
1113     {
1114         static const char msg[] = "dlopen interface not detected by configure";
1115         size_t len = min( errorsize, sizeof(msg) );
1116         memcpy( error, msg, len );
1117         error[len - 1] = 0;
1118     }
1119     return NULL;
1120 #endif
1121 }
1122
1123 /***********************************************************************
1124  *              wine_dlclose
1125  */
1126 int wine_dlclose( void *handle, char *error, size_t errorsize )
1127 {
1128 #ifdef HAVE_DLOPEN
1129     int ret;
1130     const char *s;
1131     dlerror(); dlerror();
1132     ret = dlclose( handle );
1133     s = dlerror();
1134     if (error && errorsize)
1135     {
1136         if (s)
1137         {
1138             size_t len = strlen(s);
1139             if (len >= errorsize) len = errorsize - 1;
1140             memcpy( error, s, len );
1141             error[len] = 0;
1142         }
1143         else error[0] = 0;
1144     }
1145     dlerror();
1146     return ret;
1147 #else
1148     if (error)
1149     {
1150         static const char msg[] = "dlopen interface not detected by configure";
1151         size_t len = min( errorsize, sizeof(msg) );
1152         memcpy( error, msg, len );
1153         error[len - 1] = 0;
1154     }
1155     return 1;
1156 #endif
1157 }