/*
* Win32 builtin dlls support
*
* Copyright 2000 Alexandre Julliard
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
*/
#include "config.h"
#include "wine/port.h"
#include <assert.h>
#include <ctype.h>
#include <fcntl.h>
#include <limits.h>
#include <stdarg.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#ifdef HAVE_SYS_MMAN_H
#include <sys/mman.h>
#endif
#ifdef HAVE_SYS_RESOURCE_H
# include <sys/resource.h>
#endif
#ifdef HAVE_UNISTD_H
# include <unistd.h>
#endif
#define NONAMELESSUNION
#define NONAMELESSSTRUCT
#include "windef.h"
#include "winbase.h"
#include "wine/library.h"
#ifdef __APPLE__
#include <crt_externs.h>
#define environ (*_NSGetEnviron())
#else
extern char **environ;
#endif
/* argc/argv for the Windows application */
int __wine_main_argc = 0;
char **__wine_main_argv = NULL;
WCHAR **__wine_main_wargv = NULL;
char **__wine_main_environ = NULL;
struct dll_path_context
{
unsigned int index; /* current index in the dll path list */
char *buffer; /* buffer used for storing path names */
char *name; /* start of file name part in buffer (including leading slash) */
int namelen; /* length of file name without .so extension */
int win16; /* 16-bit dll search */
};
#define MAX_DLLS 100
static struct
{
const IMAGE_NT_HEADERS *nt; /* NT header */
const char *filename; /* DLL file name */
} builtin_dlls[MAX_DLLS];
static int nb_dlls;
static const IMAGE_NT_HEADERS *main_exe;
static load_dll_callback_t load_dll_callback;
static const char *build_dir;
static const char *default_dlldir;
static const char **dll_paths;
static unsigned int nb_dll_paths;
static int dll_path_maxlen;
extern void mmap_init(void);
extern const char *get_dlldir( const char **default_dlldir );
/* build the dll load path from the WINEDLLPATH variable */
static void build_dll_path(void)
{
int len, count = 0;
char *p, *path = getenv( "WINEDLLPATH" );
const char *dlldir = get_dlldir( &default_dlldir );
if (path)
{
/* count how many path elements we need */
path = strdup(path);
p = path;
while (*p)
{
while (*p == ':') p++;
if (!*p) break;
count++;
while (*p && *p != ':') p++;
}
}
dll_paths = malloc( (count+2) * sizeof(*dll_paths) );
nb_dll_paths = 0;
if (dlldir)
{
dll_path_maxlen = strlen(dlldir);
dll_paths[nb_dll_paths++] = dlldir;
}
else if ((build_dir = wine_get_build_dir()))
{
dll_path_maxlen = strlen(build_dir) + sizeof("/programs");
}
if (count)
{
p = path;
while (*p)
{
while (*p == ':') *p++ = 0;
if (!*p) break;
dll_paths[nb_dll_paths] = p;
while (*p && *p != ':') p++;
if (p - dll_paths[nb_dll_paths] > dll_path_maxlen)
dll_path_maxlen = p - dll_paths[nb_dll_paths];
nb_dll_paths++;
}
}
/* append default dll dir (if not empty) to path */
if ((len = strlen(default_dlldir)) > 0)
{
if (len > dll_path_maxlen) dll_path_maxlen = len;
dll_paths[nb_dll_paths++] = default_dlldir;
}
}
/* check if the library is the correct architecture */
/* only returns false for a valid library of the wrong arch */
static int check_library_arch( int fd )
{
#ifdef __APPLE__
struct /* Mach-O header */
{
unsigned int magic;
unsigned int cputype;
} header;
if (read( fd, &header, sizeof(header) ) != sizeof(header)) return 1;
if (header.magic != 0xfeedface) return 1;
if (sizeof(void *) == sizeof(int)) return !(header.cputype >> 24);
else return (header.cputype >> 24) == 1; /* CPU_ARCH_ABI64 */
#else
struct /* ELF header */
{
unsigned char magic[4];
unsigned char class;
unsigned char data;
unsigned char version;
} header;
if (read( fd, &header, sizeof(header) ) != sizeof(header)) return 1;
if (memcmp( header.magic, "\177ELF", 4 )) return 1;
if (header.version != 1 /* EV_CURRENT */) return 1;
#ifdef WORDS_BIGENDIAN
if (header.data != 2 /* ELFDATA2MSB */) return 1;
#else
if (header.data != 1 /* ELFDATA2LSB */) return 1;
#endif
if (sizeof(void *) == sizeof(int)) return header.class == 1; /* ELFCLASS32 */
else return header.class == 2; /* ELFCLASS64 */
#endif
}
/* check if a given file can be opened */
static inline int file_exists( const char *name )
{
int ret = 0;
int fd = open( name, O_RDONLY );
if (fd != -1)
{
ret = check_library_arch( fd );
close( fd );
}
return ret;
}
static inline char *prepend( char *buffer, const char *str, size_t len )
{
return memcpy( buffer - len, str, len );
}
/* get a filename from the next entry in the dll path */
static char *next_dll_path( struct dll_path_context *context )
{
unsigned int index = context->index++;
int namelen = context->namelen;
char *path = context->name;
switch(index)
{
case 0: /* try dlls dir with subdir prefix */
if (namelen > 4 && !memcmp( context->name + namelen - 4, ".dll", 4 )) namelen -= 4;
if (!context->win16) path = prepend( path, context->name, namelen );
path = prepend( path, "/dlls", sizeof("/dlls") - 1 );
path = prepend( path, build_dir, strlen(build_dir) );
return path;
case 1: /* try programs dir with subdir prefix */
if (!context->win16)
{
if (namelen > 4 && !memcmp( context->name + namelen - 4, ".exe", 4 )) namelen -= 4;
path = prepend( path, context->name, namelen );
path = prepend( path, "/programs", sizeof("/programs") - 1 );
path = prepend( path, build_dir, strlen(build_dir) );
return path;
}
context->index++;
/* fall through */
default:
index -= 2;
if (index < nb_dll_paths)
return prepend( context->name, dll_paths[index], strlen( dll_paths[index] ));
break;
}
return NULL;
}
/* get a filename from the first entry in the dll path */
static char *first_dll_path( const char *name, int win16, struct dll_path_context *context )
{
char *p;
int namelen = strlen( name );
const char *ext = win16 ? "16" : ".so";
context->buffer = malloc( dll_path_maxlen + 2 * namelen + strlen(ext) + 3 );
context->index = build_dir ? 0 : 2; /* if no build dir skip all the build dir magic cases */
context->name = context->buffer + dll_path_maxlen + namelen + 1;
context->namelen = namelen + 1;
context->win16 = win16;
/* store the name at the end of the buffer, followed by extension */
p = context->name;
*p++ = '/';
memcpy( p, name, namelen );
strcpy( p + namelen, ext );
return next_dll_path( context );
}
/* free the dll path context created by first_dll_path */
static inline void free_dll_path( struct dll_path_context *context )
{
free( context->buffer );
}
/* open a library for a given dll, searching in the dll path
* 'name' must be the Windows dll name (e.g. "kernel32.dll") */
static void *dlopen_dll( const char *name, char *error, int errorsize,
int test_only, int *exists )
{
struct dll_path_context context;
char *path;
void *ret = NULL;
*exists = 0;
for (path = first_dll_path( name, 0, &context ); path; path = next_dll_path( &context ))
{
if (!test_only && (ret = wine_dlopen( path, RTLD_NOW, error, errorsize ))) break;
if ((*exists = file_exists( path ))) break; /* exists but cannot be loaded, return the error */
}
free_dll_path( &context );
return ret;
}
/* adjust an array of pointers to make them into RVAs */
static inline void fixup_rva_ptrs( void *array, BYTE *base, unsigned int count )
{
void **src = (void **)array;
DWORD *dst = (DWORD *)array;
while (count--)
{
*dst++ = *src ? (BYTE *)*src - base : 0;
src++;
}
}
/* fixup an array of RVAs by adding the specified delta */
static inline void fixup_rva_dwords( DWORD *ptr, int delta, unsigned int count )
{
while (count--)
{
if (*ptr) *ptr += delta;
ptr++;
}
}
/* fixup RVAs in the import directory */
static void fixup_imports( IMAGE_IMPORT_DESCRIPTOR *dir, BYTE *base, int delta )
{
UINT_PTR *ptr;
while (dir->Name)
{
fixup_rva_dwords( &dir->u.OriginalFirstThunk, delta, 1 );
fixup_rva_dwords( &dir->Name, delta, 1 );
fixup_rva_dwords( &dir->FirstThunk, delta, 1 );
ptr = (UINT_PTR *)(base + (dir->u.OriginalFirstThunk ? dir->u.OriginalFirstThunk : dir->FirstThunk));
while (*ptr)
{
if (!(*ptr & IMAGE_ORDINAL_FLAG)) *ptr += delta;
ptr++;
}
dir++;
}
}
/* fixup RVAs in the export directory */
static void fixup_exports( IMAGE_EXPORT_DIRECTORY *dir, BYTE *base, int delta )
{
fixup_rva_dwords( &dir->Name, delta, 1 );
fixup_rva_dwords( &dir->AddressOfFunctions, delta, 1 );
fixup_rva_dwords( &dir->AddressOfNames, delta, 1 );
fixup_rva_dwords( &dir->AddressOfNameOrdinals, delta, 1 );
fixup_rva_dwords( (DWORD *)(base + dir->AddressOfNames), delta, dir->NumberOfNames );
fixup_rva_ptrs( (base + dir->AddressOfFunctions), base, dir->NumberOfFunctions );
}
/* fixup RVAs in the resource directory */
static void fixup_resources( IMAGE_RESOURCE_DIRECTORY *dir, BYTE *root, int delta )
{
IMAGE_RESOURCE_DIRECTORY_ENTRY *entry;
int i;
entry = (IMAGE_RESOURCE_DIRECTORY_ENTRY *)(dir + 1);
for (i = 0; i < dir->NumberOfNamedEntries + dir->NumberOfIdEntries; i++, entry++)
{
void *ptr = root + entry->u2.s3.OffsetToDirectory;
if (entry->u2.s3.DataIsDirectory) fixup_resources( ptr, root, delta );
else
{
IMAGE_RESOURCE_DATA_ENTRY *data = ptr;
fixup_rva_dwords( &data->OffsetToData, delta, 1 );
}
}
}
/* map a builtin dll in memory and fixup RVAs */
static void *map_dll( const IMAGE_NT_HEADERS *nt_descr )
{
#ifdef HAVE_MMAP
IMAGE_DATA_DIRECTORY *dir;
IMAGE_DOS_HEADER *dos;
IMAGE_NT_HEADERS *nt;
IMAGE_SECTION_HEADER *sec;
BYTE *addr;
DWORD code_start, data_start, data_end;
const size_t page_size = getpagesize();
const size_t page_mask = page_size - 1;
int delta, nb_sections = 2; /* code + data */
unsigned int i;
size_t size = (sizeof(IMAGE_DOS_HEADER)
+ sizeof(IMAGE_NT_HEADERS)
+ nb_sections * sizeof(IMAGE_SECTION_HEADER));
assert( size <= page_size );
/* module address must be aligned on 64K boundary */
addr = (BYTE *)((nt_descr->OptionalHeader.ImageBase + 0xffff) & ~0xffff);
if (wine_anon_mmap( addr, page_size, PROT_READ|PROT_WRITE, MAP_FIXED ) != addr) return NULL;
dos = (IMAGE_DOS_HEADER *)addr;
nt = (IMAGE_NT_HEADERS *)(dos + 1);
sec = (IMAGE_SECTION_HEADER *)(nt + 1);
/* Build the DOS and NT headers */
dos->e_magic = IMAGE_DOS_SIGNATURE;
dos->e_cblp = 0x90;
dos->e_cp = 3;
dos->e_cparhdr = (sizeof(*dos)+0xf)/0x10;
dos->e_minalloc = 0;
dos->e_maxalloc = 0xffff;
dos->e_ss = 0x0000;
dos->e_sp = 0x00b8;
dos->e_lfarlc = sizeof(*dos);
dos->e_lfanew = sizeof(*dos);
*nt = *nt_descr;
delta = (const BYTE *)nt_descr - addr;
code_start = page_size;
data_start = delta & ~page_mask;
data_end = (nt->OptionalHeader.SizeOfImage + delta + page_mask) & ~page_mask;
fixup_rva_ptrs( &nt->OptionalHeader.AddressOfEntryPoint, addr, 1 );
nt->FileHeader.NumberOfSections = nb_sections;
nt->OptionalHeader.BaseOfCode = code_start;
#ifndef _WIN64
nt->OptionalHeader.BaseOfData = data_start;
#endif
nt->OptionalHeader.SizeOfCode = data_start - code_start;
nt->OptionalHeader.SizeOfInitializedData = data_end - data_start;
nt->OptionalHeader.SizeOfUninitializedData = 0;
nt->OptionalHeader.SizeOfImage = data_end;
nt->OptionalHeader.ImageBase = (ULONG_PTR)addr;
/* Build the code section */
memcpy( sec->Name, ".text", sizeof(".text") );
sec->SizeOfRawData = data_start - code_start;
sec->Misc.VirtualSize = sec->SizeOfRawData;
sec->VirtualAddress = code_start;
sec->PointerToRawData = code_start;
sec->Characteristics = (IMAGE_SCN_CNT_CODE | IMAGE_SCN_MEM_EXECUTE | IMAGE_SCN_MEM_READ);
sec++;
/* Build the data section */
memcpy( sec->Name, ".data", sizeof(".data") );
sec->SizeOfRawData = data_end - data_start;
sec->Misc.VirtualSize = sec->SizeOfRawData;
sec->VirtualAddress = data_start;
sec->PointerToRawData = data_start;
sec->Characteristics = (IMAGE_SCN_CNT_INITIALIZED_DATA |
IMAGE_SCN_MEM_WRITE | IMAGE_SCN_MEM_READ);
sec++;
for (i = 0; i < nt->OptionalHeader.NumberOfRvaAndSizes; i++)
fixup_rva_dwords( &nt->OptionalHeader.DataDirectory[i].VirtualAddress, delta, 1 );
/* Build the import directory */
dir = &nt->OptionalHeader.DataDirectory[IMAGE_FILE_IMPORT_DIRECTORY];
if (dir->Size)
{
IMAGE_IMPORT_DESCRIPTOR *imports = (void *)(addr + dir->VirtualAddress);
fixup_imports( imports, addr, delta );
}
/* Build the resource directory */
dir = &nt->OptionalHeader.DataDirectory[IMAGE_FILE_RESOURCE_DIRECTORY];
if (dir->Size)
{
void *ptr = (void *)(addr + dir->VirtualAddress);
fixup_resources( ptr, ptr, delta );
}
/* Build the export directory */
dir = &nt->OptionalHeader.DataDirectory[IMAGE_FILE_EXPORT_DIRECTORY];
if (dir->Size)
{
IMAGE_EXPORT_DIRECTORY *exports = (void *)(addr + dir->VirtualAddress);
fixup_exports( exports, addr, delta );
}
return addr;
#else /* HAVE_MMAP */
return NULL;
#endif /* HAVE_MMAP */
}
/***********************************************************************
* __wine_get_main_environment
*
* Return an environment pointer to work around lack of environ variable.
* Only exported on Mac OS.
*/
char **__wine_get_main_environment(void)
{
return environ;
}
/***********************************************************************
* __wine_dll_register
*
* Register a built-in DLL descriptor.
*/
void __wine_dll_register( const IMAGE_NT_HEADERS *header, const char *filename )
{
if (load_dll_callback) load_dll_callback( map_dll(header), filename );
else
{
if (!(header->FileHeader.Characteristics & IMAGE_FILE_DLL))
main_exe = header;
else
{
assert( nb_dlls < MAX_DLLS );
builtin_dlls[nb_dlls].nt = header;
builtin_dlls[nb_dlls].filename = filename;
nb_dlls++;
}
}
}
/***********************************************************************
* wine_dll_set_callback
*
* Set the callback function for dll loading, and call it
* for all dlls that were implicitly loaded already.
*/
void wine_dll_set_callback( load_dll_callback_t load )
{
int i;
load_dll_callback = load;
for (i = 0; i < nb_dlls; i++)
{
const IMAGE_NT_HEADERS *nt = builtin_dlls[i].nt;
if (!nt) continue;
builtin_dlls[i].nt = NULL;
load_dll_callback( map_dll(nt), builtin_dlls[i].filename );
}
nb_dlls = 0;
if (main_exe) load_dll_callback( map_dll(main_exe), "" );
}
/***********************************************************************
* wine_dll_load
*
* Load a builtin dll.
*/
void *wine_dll_load( const char *filename, char *error, int errorsize, int *file_exists )
{
int i;
/* callback must have been set already */
assert( load_dll_callback );
/* check if we have it in the list */
/* this can happen when initializing pre-loaded dlls in wine_dll_set_callback */
for (i = 0; i < nb_dlls; i++)
{
if (!builtin_dlls[i].nt) continue;
if (!strcmp( builtin_dlls[i].filename, filename ))
{
const IMAGE_NT_HEADERS *nt = builtin_dlls[i].nt;
builtin_dlls[i].nt = NULL;
load_dll_callback( map_dll(nt), builtin_dlls[i].filename );
*file_exists = 1;
return (void *)1;
}
}
return dlopen_dll( filename, error, errorsize, 0, file_exists );
}
/***********************************************************************
* wine_dll_unload
*
* Unload a builtin dll.
*/
void wine_dll_unload( void *handle )
{
if (handle != (void *)1)
wine_dlclose( handle, NULL, 0 );
}
/***********************************************************************
* wine_dll_load_main_exe
*
* Try to load the .so for the main exe.
*/
void *wine_dll_load_main_exe( const char *name, char *error, int errorsize,
int test_only, int *file_exists )
{
return dlopen_dll( name, error, errorsize, test_only, file_exists );
}
/***********************************************************************
* wine_dll_enum_load_path
*
* Enumerate the dll load path.
*/
const char *wine_dll_enum_load_path( unsigned int index )
{
if (index >= nb_dll_paths) return NULL;
return dll_paths[index];
}
/***********************************************************************
* wine_dll_get_owner
*
* Retrieve the name of the 32-bit owner dll for a 16-bit dll.
* Return 0 if OK, -1 on error.
*/
int wine_dll_get_owner( const char *name, char *buffer, int size, int *exists )
{
int ret = -1;
char *path;
struct dll_path_context context;
*exists = 0;
for (path = first_dll_path( name, 1, &context ); path; path = next_dll_path( &context ))
{
int fd = open( path, O_RDONLY );
if (fd != -1)
{
int res = read( fd, buffer, size - 1 );
while (res > 0 && (buffer[res-1] == '\n' || buffer[res-1] == '\r')) res--;
buffer[res] = 0;
close( fd );
*exists = 1;
ret = 0;
break;
}
}
free_dll_path( &context );
return ret;
}
/***********************************************************************
* set_max_limit
*
* Set a user limit to the maximum allowed value.
*/
static void set_max_limit( int limit )
{
#ifdef HAVE_SETRLIMIT
struct rlimit rlimit;
if (!getrlimit( limit, &rlimit ))
{
rlimit.rlim_cur = rlimit.rlim_max;
if (setrlimit( limit, &rlimit ) != 0)
{
#if defined(__APPLE__) && defined(RLIMIT_NOFILE) && defined(OPEN_MAX)
/* On Leopard, setrlimit(RLIMIT_NOFILE, ...) fails on attempts to set
* rlim_cur above OPEN_MAX (even if rlim_max > OPEN_MAX). */
if (limit == RLIMIT_NOFILE && rlimit.rlim_cur > OPEN_MAX)
{
rlimit.rlim_cur = OPEN_MAX;
setrlimit( limit, &rlimit );
}
#endif
}
}
#endif
}
/***********************************************************************
* wine_init
*
* Main Wine initialisation.
*/
void wine_init( int argc, char *argv[], char *error, int error_size )
{
struct dll_path_context context;
char *path;
void *ntdll = NULL;
void (*init_func)(void);
/* force a few limits that are set too low on some platforms */
#ifdef RLIMIT_NOFILE
set_max_limit( RLIMIT_NOFILE );
#endif
#ifdef RLIMIT_AS
set_max_limit( RLIMIT_AS );
#endif
wine_init_argv0_path( argv[0] );
build_dll_path();
__wine_main_argc = argc;
__wine_main_argv = argv;
__wine_main_environ = __wine_get_main_environment();
mmap_init();
for (path = first_dll_path( "ntdll.dll", 0, &context ); path; path = next_dll_path( &context ))
{
if ((ntdll = wine_dlopen( path, RTLD_NOW, error, error_size )))
{
/* if we didn't use the default dll dir, remove it from the search path */
if (default_dlldir[0] && context.index < nb_dll_paths + 2) nb_dll_paths--;
break;
}
}
free_dll_path( &context );
if (!ntdll) return;
if (!(init_func = wine_dlsym( ntdll, "__wine_process_init", error, error_size ))) return;
init_func();
}
/*
* These functions provide wrappers around dlopen() and associated
* functions. They work around a bug in glibc 2.1.x where calling
* a dl*() function after a previous dl*() function has failed
* without a dlerror() call between the two will cause a crash.
* They all take a pointer to a buffer that
* will receive the error description (from dlerror()). This
* parameter may be NULL if the error description is not required.
*/
#ifndef RTLD_FIRST
#define RTLD_FIRST 0
#endif
/***********************************************************************
* wine_dlopen
*/
void *wine_dlopen( const char *filename, int flag, char *error, size_t errorsize )
{
#ifdef HAVE_DLOPEN
void *ret;
const char *s;
#ifdef __APPLE__
/* the Mac OS loader pretends to be able to load PE files, so avoid them here */
unsigned char magic[2];
int fd = open( filename, O_RDONLY );
if (fd != -1)
{
if (pread( fd, magic, 2, 0 ) == 2 && magic[0] == 'M' && magic[1] == 'Z')
{
static const char msg[] = "MZ format";
size_t len = min( errorsize, sizeof(msg) );
memcpy( error, msg, len );
error[len - 1] = 0;
close( fd );
return NULL;
}
close( fd );
}
#endif
dlerror(); dlerror();
#ifdef __sun
if (strchr( filename, ':' ))
{
char path[PATH_MAX];
/* Solaris' brain damaged dlopen() treats ':' as a path separator */
realpath( filename, path );
ret = dlopen( path, flag | RTLD_FIRST );
}
else
#endif
ret = dlopen( filename, flag | RTLD_FIRST );
s = dlerror();
if (error && errorsize)
{
if (s)
{
size_t len = strlen(s);
if (len >= errorsize) len = errorsize - 1;
memcpy( error, s, len );
error[len] = 0;
}
else error[0] = 0;
}
dlerror();
return ret;
#else
if (error)
{
static const char msg[] = "dlopen interface not detected by configure";
size_t len = min( errorsize, sizeof(msg) );
memcpy( error, msg, len );
error[len - 1] = 0;
}
return NULL;
#endif
}
/***********************************************************************
* wine_dlsym
*/
void *wine_dlsym( void *handle, const char *symbol, char *error, size_t errorsize )
{
#ifdef HAVE_DLOPEN
void *ret;
const char *s;
dlerror(); dlerror();
ret = dlsym( handle, symbol );
s = dlerror();
if (error && errorsize)
{
if (s)
{
size_t len = strlen(s);
if (len >= errorsize) len = errorsize - 1;
memcpy( error, s, len );
error[len] = 0;
}
else error[0] = 0;
}
dlerror();
return ret;
#else
if (error)
{
static const char msg[] = "dlopen interface not detected by configure";
size_t len = min( errorsize, sizeof(msg) );
memcpy( error, msg, len );
error[len - 1] = 0;
}
return NULL;
#endif
}
/***********************************************************************
* wine_dlclose
*/
int wine_dlclose( void *handle, char *error, size_t errorsize )
{
#ifdef HAVE_DLOPEN
int ret;
const char *s;
dlerror(); dlerror();
ret = dlclose( handle );
s = dlerror();
if (error && errorsize)
{
if (s)
{
size_t len = strlen(s);
if (len >= errorsize) len = errorsize - 1;
memcpy( error, s, len );
error[len] = 0;
}
else error[0] = 0;
}
dlerror();
return ret;
#else
if (error)
{
static const char msg[] = "dlopen interface not detected by configure";
size_t len = min( errorsize, sizeof(msg) );
memcpy( error, msg, len );
error[len - 1] = 0;
}
return 1;
#endif
}