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