+++ /dev/null
-/* loader-dyld.c -- dynamic linking on darwin and OS X
-
- Copyright (C) 1998, 1999, 2000, 2004, 2006,
- 2007, 2008 Free Software Foundation, Inc.
- Written by Peter O'Gorman, 1998
-
- NOTE: The canonical source of this file is maintained with the
- GNU Libtool package. Report bugs to bug-libtool@gnu.org.
-
-GNU Libltdl 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 of the License, or (at your option) any later version.
-
-As a special exception to the GNU Lesser General Public License,
-if you distribute this file as part of a program or library that
-is built using GNU Libtool, you may include this file under the
-same distribution terms that you use for the rest of that program.
-
-GNU Libltdl 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 GNU Libltdl; see the file COPYING.LIB. If not, a
-copy can be downloaded from http://www.gnu.org/licenses/lgpl.html,
-or obtained by writing to the Free Software Foundation, Inc.,
-51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
-*/
-
-#include "lt__private.h"
-#include "lt_dlloader.h"
-
-/* Use the preprocessor to rename non-static symbols to avoid namespace
- collisions when the loader code is statically linked into libltdl.
- Use the "<module_name>_LTX_" prefix so that the symbol addresses can
- be fetched from the preloaded symbol list by lt_dlsym(): */
-#define get_vtable dyld_LTX_get_vtable
-
-LT_BEGIN_C_DECLS
-LT_SCOPE lt_dlvtable *get_vtable (lt_user_data loader_data);
-LT_END_C_DECLS
-
-
-/* Boilerplate code to set up the vtable for hooking this loader into
- libltdl's loader list: */
-static int vl_init (lt_user_data loader_data);
-static int vl_exit (lt_user_data loader_data);
-static lt_module vm_open (lt_user_data loader_data, const char *filename,
- lt_dladvise advise);
-static int vm_close (lt_user_data loader_data, lt_module module);
-static void * vm_sym (lt_user_data loader_data, lt_module module,
- const char *symbolname);
-
-static lt_dlvtable *vtable = 0;
-
-/* Return the vtable for this loader, only the name and sym_prefix
- attributes (plus the virtual function implementations, obviously)
- change between loaders. */
-lt_dlvtable *
-get_vtable (lt_user_data loader_data)
-{
- if (!vtable)
- {
- vtable = lt__zalloc (sizeof *vtable);
- }
-
- if (vtable && !vtable->name)
- {
- vtable->name = "lt_dyld";
- vtable->sym_prefix = "_";
- vtable->dlloader_init = vl_init;
- vtable->module_open = vm_open;
- vtable->module_close = vm_close;
- vtable->find_sym = vm_sym;
- vtable->dlloader_exit = vl_exit;
- vtable->dlloader_data = loader_data;
- vtable->priority = LT_DLLOADER_APPEND;
- }
-
- if (vtable && (vtable->dlloader_data != loader_data))
- {
- LT__SETERROR (INIT_LOADER);
- return 0;
- }
-
- return vtable;
-}
-
-
-
-/* --- IMPLEMENTATION --- */
-
-
-#if defined(HAVE_MACH_O_DYLD_H)
-# if !defined(__APPLE_CC__) && !defined(__MWERKS__) && !defined(__private_extern__)
- /* Is this correct? Does it still function properly? */
-# define __private_extern__ extern
-# endif
-# include <mach-o/dyld.h>
-#endif
-
-#include <mach-o/getsect.h>
-
-/* We have to put some stuff here that isn't in older dyld.h files */
-#if !defined(ENUM_DYLD_BOOL)
-# define ENUM_DYLD_BOOL
-# undef FALSE
-# undef TRUE
- enum DYLD_BOOL {
- FALSE,
- TRUE
- };
-#endif
-#if !defined(LC_REQ_DYLD)
-# define LC_REQ_DYLD 0x80000000
-#endif
-#if !defined(LC_LOAD_WEAK_DYLIB)
-# define LC_LOAD_WEAK_DYLIB (0x18 | LC_REQ_DYLD)
-#endif
-
-#if !defined(NSADDIMAGE_OPTION_NONE)
-# define NSADDIMAGE_OPTION_NONE 0x0
-#endif
-#if !defined(NSADDIMAGE_OPTION_RETURN_ON_ERROR)
-# define NSADDIMAGE_OPTION_RETURN_ON_ERROR 0x1
-#endif
-#if !defined(NSADDIMAGE_OPTION_WITH_SEARCHING)
-# define NSADDIMAGE_OPTION_WITH_SEARCHING 0x2
-#endif
-#if !defined(NSADDIMAGE_OPTION_RETURN_ONLY_IF_LOADED)
-# define NSADDIMAGE_OPTION_RETURN_ONLY_IF_LOADED 0x4
-#endif
-#if !defined(NSADDIMAGE_OPTION_MATCH_FILENAME_BY_INSTALLNAME)
-# define NSADDIMAGE_OPTION_MATCH_FILENAME_BY_INSTALLNAME 0x8
-#endif
-
-#if !defined(NSLOOKUPSYMBOLINIMAGE_OPTION_BIND)
-# define NSLOOKUPSYMBOLINIMAGE_OPTION_BIND 0x0
-#endif
-#if !defined(NSLOOKUPSYMBOLINIMAGE_OPTION_BIND_NOW)
-# define NSLOOKUPSYMBOLINIMAGE_OPTION_BIND_NOW 0x1
-#endif
-#if !defined(NSLOOKUPSYMBOLINIMAGE_OPTION_BIND_FULLY)
-# define NSLOOKUPSYMBOLINIMAGE_OPTION_BIND_FULLY 0x2
-#endif
-#if !defined(NSLOOKUPSYMBOLINIMAGE_OPTION_RETURN_ON_ERROR)
-# define NSLOOKUPSYMBOLINIMAGE_OPTION_RETURN_ON_ERROR 0x4
-#endif
-
-#define LT__SYMLOOKUP_OPTS (NSLOOKUPSYMBOLINIMAGE_OPTION_BIND_NOW \
- | NSLOOKUPSYMBOLINIMAGE_OPTION_RETURN_ON_ERROR)
-
-#if defined(__BIG_ENDIAN__)
-# define LT__MAGIC MH_MAGIC
-#else
-# define LT__MAGIC MH_CIGAM
-#endif
-
-#define DYLD__SETMYERROR(errmsg) LT__SETERRORSTR (dylderror (errmsg))
-#define DYLD__SETERROR(errcode) DYLD__SETMYERROR (LT__STRERROR (errcode))
-
-typedef struct mach_header mach_header;
-typedef struct dylib_command dylib_command;
-
-static const char *dylderror (const char *errmsg);
-static const mach_header *lt__nsmodule_get_header (NSModule module);
-static const char *lt__header_get_instnam (const mach_header *mh);
-static const mach_header *lt__match_loadedlib (const char *name);
-static NSSymbol lt__linkedlib_symbol (const char *symname, const mach_header *mh);
-
-static const mach_header *(*lt__addimage) (const char *image_name,
- unsigned long options) = 0;
-static NSSymbol (*lt__image_symbol) (const mach_header *image,
- const char *symbolName,
- unsigned long options) = 0;
-static enum DYLD_BOOL (*lt__image_symbol_p) (const mach_header *image,
- const char *symbolName) = 0;
-static enum DYLD_BOOL (*lt__module_export) (NSModule module) = 0;
-
-static int dyld_cannot_close = 0;
-
-
-/* A function called through the vtable when this loader is no
- longer needed by the application. */
-static int
-vl_exit (lt_user_data LT__UNUSED loader_data)
-{
- vtable = NULL;
- return 0;
-}
-
-/* A function called through the vtable to initialise this loader. */
-static int
-vl_init (lt_user_data loader_data)
-{
- int errors = 0;
-
- if (! dyld_cannot_close)
- {
- if (!_dyld_present ())
- {
- ++errors;
- }
- else
- {
- (void) _dyld_func_lookup ("__dyld_NSAddImage",
- (unsigned long*) <__addimage);
- (void) _dyld_func_lookup ("__dyld_NSLookupSymbolInImage",
- (unsigned long*)<__image_symbol);
- (void) _dyld_func_lookup ("__dyld_NSIsSymbolNameDefinedInImage",
- (unsigned long*) <__image_symbol_p);
- (void) _dyld_func_lookup ("__dyld_NSMakePrivateModulePublic",
- (unsigned long*) <__module_export);
- dyld_cannot_close = lt_dladderror ("can't close a dylib");
- }
- }
-
- return errors;
-}
-
-
-/* A function called through the vtable to open a module with this
- loader. Returns an opaque representation of the newly opened
- module for processing with this loader's other vtable functions. */
-static lt_module
-vm_open (lt_user_data loader_data, const char *filename,
- lt_dladvise LT__UNUSED advise)
-{
- lt_module module = 0;
- NSObjectFileImage ofi = 0;
-
- if (!filename)
- {
- return (lt_module) -1;
- }
-
- switch (NSCreateObjectFileImageFromFile (filename, &ofi))
- {
- case NSObjectFileImageSuccess:
- module = NSLinkModule (ofi, filename, NSLINKMODULE_OPTION_RETURN_ON_ERROR
- | NSLINKMODULE_OPTION_PRIVATE
- | NSLINKMODULE_OPTION_BINDNOW);
- NSDestroyObjectFileImage (ofi);
-
- if (module)
- {
- lt__module_export (module);
- }
- break;
-
- case NSObjectFileImageInappropriateFile:
- if (lt__image_symbol_p && lt__image_symbol)
- {
- module = (lt_module) lt__addimage(filename,
- NSADDIMAGE_OPTION_RETURN_ON_ERROR);
- }
- break;
-
- case NSObjectFileImageFailure:
- case NSObjectFileImageArch:
- case NSObjectFileImageFormat:
- case NSObjectFileImageAccess:
- /*NOWORK*/
- break;
- }
-
- if (!module)
- {
- DYLD__SETERROR (CANNOT_OPEN);
- }
-
- return module;
-}
-
-
-/* A function called through the vtable when a particular module
- should be unloaded. */
-static int
-vm_close (lt_user_data loader_data, lt_module module)
-{
- int errors = 0;
-
- if (module != (lt_module) -1)
- {
- const mach_header *mh = (const mach_header *) module;
- int flags = 0;
- if (mh->magic == LT__MAGIC)
- {
- lt_dlseterror (dyld_cannot_close);
- ++errors;
- }
- else
- {
- /* Currently, if a module contains c++ static destructors and it
- is unloaded, we get a segfault in atexit(), due to compiler and
- dynamic loader differences of opinion, this works around that. */
- if ((const struct section *) NULL !=
- getsectbynamefromheader (lt__nsmodule_get_header (module),
- "__DATA", "__mod_term_func"))
- {
- flags |= NSUNLINKMODULE_OPTION_KEEP_MEMORY_MAPPED;
- }
-#if defined(__ppc__)
- flags |= NSUNLINKMODULE_OPTION_RESET_LAZY_REFERENCES;
-#endif
- if (!NSUnLinkModule (module, flags))
- {
- DYLD__SETERROR (CANNOT_CLOSE);
- ++errors;
- }
- }
- }
-
- return errors;
-}
-
-/* A function called through the vtable to get the address of
- a symbol loaded from a particular module. */
-static void *
-vm_sym (lt_user_data loader_data, lt_module module, const char *name)
-{
- NSSymbol *nssym = 0;
- const mach_header *mh = (const mach_header *) module;
- char saveError[256] = "Symbol not found";
-
- if (module == (lt_module) -1)
- {
- void *address, *unused;
- _dyld_lookup_and_bind (name, (unsigned long*) &address, &unused);
- return address;
- }
-
- if (mh->magic == LT__MAGIC)
- {
- if (lt__image_symbol_p && lt__image_symbol)
- {
- if (lt__image_symbol_p (mh, name))
- {
- nssym = lt__image_symbol (mh, name, LT__SYMLOOKUP_OPTS);
- }
- }
-
- }
- else
- {
- nssym = NSLookupSymbolInModule (module, name);
- }
-
- if (!nssym)
- {
- strncpy (saveError, dylderror (LT__STRERROR (SYMBOL_NOT_FOUND)), 255);
- saveError[255] = 0;
- if (!mh)
- {
- mh = (mach_header *)lt__nsmodule_get_header (module);
- }
- nssym = lt__linkedlib_symbol (name, mh);
- }
-
- if (!nssym)
- {
- LT__SETERRORSTR (saveError);
- }
-
- return nssym ? NSAddressOfSymbol (nssym) : 0;
-}
-
-
-
-
-/* --- HELPER FUNCTIONS --- */
-
-
-/* Return the dyld error string, or the passed in error string if none. */
-static const char *
-dylderror (const char *errmsg)
-{
- NSLinkEditErrors ler;
- int lerno;
- const char *file;
- const char *errstr;
-
- NSLinkEditError (&ler, &lerno, &file, &errstr);
-
- if (! (errstr && *errstr))
- {
- errstr = errmsg;
- }
-
- return errstr;
-}
-
-/* There should probably be an apple dyld api for this. */
-static const mach_header *
-lt__nsmodule_get_header (NSModule module)
-{
- int i = _dyld_image_count();
- const char *modname = NSNameOfModule (module);
- const mach_header *mh = 0;
-
- if (!modname)
- return NULL;
-
- while (i > 0)
- {
- --i;
- if (strneq (_dyld_get_image_name (i), modname))
- {
- mh = _dyld_get_image_header (i);
- break;
- }
- }
-
- return mh;
-}
-
-/* NSAddImage is also used to get the loaded image, but it only works if
- the lib is installed, for uninstalled libs we need to check the
- install_names against each other. Note that this is still broken if
- DYLD_IMAGE_SUFFIX is set and a different lib was loaded as a result. */
-static const char *
-lt__header_get_instnam (const mach_header *mh)
-{
- unsigned long offset = sizeof(mach_header);
- const char* result = 0;
- int j;
-
- for (j = 0; j < mh->ncmds; j++)
- {
- struct load_command *lc;
-
- lc = (struct load_command*) (((unsigned long) mh) + offset);
- if (LC_ID_DYLIB == lc->cmd)
- {
- result=(char*)(((dylib_command*) lc)->dylib.name.offset +
- (unsigned long) lc);
- }
- offset += lc->cmdsize;
- }
-
- return result;
-}
-
-static const mach_header *
-lt__match_loadedlib (const char *name)
-{
- const mach_header *mh = 0;
- int i = _dyld_image_count();
-
- while (i > 0)
- {
- const char *id;
-
- --i;
- id = lt__header_get_instnam (_dyld_get_image_header (i));
- if (id && strneq (id, name))
- {
- mh = _dyld_get_image_header (i);
- break;
- }
- }
-
- return mh;
-}
-
-/* Safe to assume our mh is good. */
-static NSSymbol
-lt__linkedlib_symbol (const char *symname, const mach_header *mh)
-{
- NSSymbol symbol = 0;
-
- if (lt__image_symbol && NSIsSymbolNameDefined (symname))
- {
- unsigned long offset = sizeof(mach_header);
- struct load_command *lc;
- int j;
-
- for (j = 0; j < mh->ncmds; j++)
- {
- lc = (struct load_command*) (((unsigned long) mh) + offset);
- if ((LC_LOAD_DYLIB == lc->cmd) || (LC_LOAD_WEAK_DYLIB == lc->cmd))
- {
- unsigned long base = ((dylib_command *) lc)->dylib.name.offset;
- char *name = (char *) (base + (unsigned long) lc);
- const mach_header *mh1 = lt__match_loadedlib (name);
-
- if (!mh1)
- {
- /* Maybe NSAddImage can find it */
- mh1 = lt__addimage (name,
- NSADDIMAGE_OPTION_RETURN_ONLY_IF_LOADED
- | NSADDIMAGE_OPTION_WITH_SEARCHING
- | NSADDIMAGE_OPTION_RETURN_ON_ERROR);
- }
-
- if (mh1)
- {
- symbol = lt__image_symbol (mh1, symname, LT__SYMLOOKUP_OPTS);
- if (symbol)
- break;
- }
- }
-
- offset += lc->cmdsize;
- }
- }
-
- return symbol;
-}
HCoop / hcoop / debian / courier-authlib.git / blobdiff