/* We found two symbols for the same name in two different modules */
static NSModule multiple(NSSymbol s, NSModule om, NSModule nm)
{
NSModule ret = nm;
log_debug("Symbol \"%s\" found in modules \"%s\" and \"%s\" (using %s)",
NSNameOfSymbol(s), NSNameOfModule(om), NSNameOfModule(nm),
NSNameOfModule(ret));
return (ret);
}
NSModule multipleErrorHandler(NSSymbol s, NSModule old, NSModule newmod)
{
/* XXX
** This results in substantial leaking of memory... Should free one
** module, maybe?
*/
fprintf(stderr, "%s: Symbol `%s' found in `%s' and `%s'",
__FILE__, NSNameOfSymbol(s), NSNameOfModule(old), NSNameOfModule(newmod));
return(newmod);
}
int dlclose(void *handle)
{
if (is_mach_header(handle))
{
error(0, "Can't remove dynamic libraries on darwin");
return 0;
}
if (!NSUnLinkModule((NSModule)handle, 0))
{
error(0, "unable to unlink module %s", NSNameOfModule((NSModule)handle));
return 1;
}
return 0;
}
static int dlclose(void *handle)
{
if (( (MH_MAGIC == ((struct mach_header *)handle)->magic)) /* ppc */
|| (MH_CIGAM == ((struct mach_header *)handle)->magic)) /* 386 */
return 0; /* can't unlink, but pretend we did */
if (!NSUnLinkModule(handle, 0))
{
dlSetError("could not unlink shared object: %s", NSNameOfModule(handle));
return -1;
}
return 0;
}
int dlclose(void *handle)
{
if ((((struct mach_header *)handle)->magic == MH_MAGIC) ||
(((struct mach_header *)handle)->magic == MH_CIGAM))
{
error(-1, "Can't remove dynamic libraries on darwin");
return 0;
}
if (!NSUnLinkModule(handle, 0))
{
error(0, "unable to unlink module %s", NSNameOfModule(handle));
return 1;
}
return 0;
}
/* Returns the mach_header for the module bu going through all the loaded images
* and finding the one with the same name as the module. There really ought to be
* an api for doing this, would be faster, but there isn't one right now
*/
static const struct mach_header *get_mach_header_from_NSModule(NSModule * mod)
{
const char *mod_name = NSNameOfModule(mod);
struct mach_header *mh = NULL;
unsigned long count = _dyld_image_count();
unsigned long i;
debug("Module name: %s", mod_name);
for (i = 0; i < count; i++)
{
if (!strcmp(mod_name, _dyld_get_image_name(i)))
{
mh = _dyld_get_image_header(i);
break;
}
}
return mh;
}
/* Get the address for a specifed symbol */
void *dso_symbol(dso_handle hdl, const char *nam)
{
NSSymbol sym = NULL;
NSModule mod = NULL;
char *und = NULL;
void *add = NULL;
int x = 0;
/* Check parameters */
if (hdl == NULL) {
log_error("Invalid library handler specified");
return (NULL);
}
if (nam == NULL) {
log_error("Invalid symbol name specified");
return (NULL);
}
/* Process the correct name (add a _ before the name) */
while (nam[x] != '\0')
x++;
und = (char *)malloc(sizeof(char) * (x + 2));
while (x >= 0)
und[x + 1] = nam[x--];
und[0] = '_';
/* Find the symbol */
sym = NSLookupAndBindSymbol(und);
free(und);
if (sym == NULL)
return (NULL);
/* Dump some debugging output since this part is shaky */
mod = NSModuleForSymbol(sym);
add = NSAddressOfSymbol(sym);
log_debug("Symbol \"%s\" found in module \"%s\" at address \"0x%08X\"",
NSNameOfSymbol(sym), NSNameOfModule(mod), add);
/* We want to return the address of the symbol */
return (add);
}
/* 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;
}
static NSModule dlMultiple(NSSymbol s, NSModule oldModule, NSModule newModule)
{
dprintf((stderr, "dyld: %s: %s previously defined in %s, new definition in %s\n",
NSNameOfSymbol(s), NSNameOfModule(oldModule), NSNameOfModule(newModule)));
return newModule;
}
ap_private_extern
NSModule multiple_symbol_handler (NSSymbol s, NSModule old, NSModule new)
{
/*
* Since we can't unload symbols, we're going to run into this
* every time we reload a module. Workaround here is to just
* rebind to the new symbol, and forget about the old one.
* This is crummy, because it's basically a memory leak.
*/
#ifdef DEBUG
ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_DEBUG, NULL,
"dyld found a multiply defined symbol %s in modules:\n"
"%s\n%s\n",
NSNameOfSymbol(s),
NSNameOfModule(old), NSNameOfModule(new));
#endif
return(new);
}
ap_private_extern
void linkEdit_symbol_handler (NSLinkEditErrors c, int errorNumber,
const char *fileName, const char *errorString)
{
ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_EMERG, NULL,
"dyld errors during link edit for file %s\n%s\n",
fileName, errorString);
abort();
}