void * _dl_open (const char *file, int mode, const void *caller_dlopen, Lmid_t nsid, int argc, char *argv[], char *env[]) { struct dl_open_args args; const char *objname; const char *errstring; int errcode;  if ((mode & RTLD_BINDING_MASK) == 0)  _dl_signal_error (EINVAL, file, NULL, N_("invalid mode for dlopen()"));   __rtld_lock_lock_recursive (GL(dl_load_lock));  if (nsid == LM_ID_NEWLM) {  for (nsid = 1; nsid < DL_NNS; ++nsid) if (GL(dl_ns)[nsid]._ns_loaded == NULL) break;  if (nsid == DL_NNS) {  __rtld_lock_unlock_recursive (GL(dl_load_lock));  _dl_signal_error (EINVAL, file, NULL, N_("\ no more namespaces available for dlmopen()")); }  _dl_debug_initialize (0, nsid)->r_state = RT_CONSISTENT; }  else if (nsid != LM_ID_BASE && nsid != __LM_ID_CALLER && (GL(dl_ns)[nsid]._ns_nloaded == 0 || GL(dl_ns)[nsid]._ns_loaded->l_auditing)) _dl_signal_error (EINVAL, file, NULL, N_("invalid target namespace in dlmopen()"));  args.file = file; args.mode = mode; args.caller_dlopen = caller_dlopen; args.caller_dl_open = RETURN_ADDRESS (0); args.map = NULL; args.nsid = nsid; args.argc = argc; args.argv = argv; args.env = env; errcode = _dl_catch_error (&objname, &errstring, dl_open_worker, &args);  #ifndef MAP_COPY  _dl_unload_cache (); #endif   __rtld_lock_unlock_recursive (GL(dl_load_lock));  if (__builtin_expect (errstring != NULL, 0)) {  char *local_errstring; size_t len_errstring;   if (args.map) { #ifdef USE_TLS  if ((mode & __RTLD_AUDIT) == 0) GL(dl_tls_dtv_gaps) = true; #endif  _dl_close (args.map); }   len_errstring = strlen (errstring) + 1; if (objname == errstring + len_errstring) { size_t total_len = len_errstring + strlen (objname) + 1; local_errstring = alloca (total_len); memcpy (local_errstring, errstring, total_len); objname = local_errstring + len_errstring; } else { local_errstring = alloca (len_errstring); memcpy (local_errstring, errstring, len_errstring); }  if (errstring != _dl_out_of_memory) free ((char *) errstring);  assert (_dl_debug_initialize (0, args.nsid)->r_state == RT_CONSISTENT);   _dl_signal_error (errcode, objname, NULL, local_errstring); }  assert (_dl_debug_initialize (0, args.nsid)->r_state == RT_CONSISTENT);  #ifndef SHARED DL_STATIC_INIT (args.map); #endif  return args.map; }   #ifdef SCOPE_DEBUG #include <unistd.h>  static void show_scope (struct link_map *new) { int scope_cnt;  for (scope_cnt = 0; new->l_scope[scope_cnt] != NULL; ++scope_cnt) { char numbuf[2]; unsigned int cnt;  numbuf[0] = '0' + scope_cnt; numbuf[1] = '\0'; _dl_printf ("scope %s:", numbuf);  for (cnt = 0; cnt < new->l_scope[scope_cnt]->r_nlist; ++cnt) if (*new->l_scope[scope_cnt]->r_list[cnt]->l_name) _dl_printf (" %s", new->l_scope[scope_cnt]->r_list[cnt]->l_name); else _dl_printf (" <main>");  _dl_printf ("\n"); } } #endif
dl_open_worker (void *a){  struct dl_open_args *args = a;  const char *file = args->file;  int mode = args->mode;  struct link_map *new, *l;  int lazy;  unsigned int i;#ifdef USE_TLS  bool any_tls = false;#endif  struct link_map *call_map = NULL;  /* Check whether _dl_open() has been called from a valid DSO.  */  if (__check_caller (args->caller_dl_open,		      allow_libc|allow_libdl|allow_ldso) != 0)    _dl_signal_error (0, "dlopen", NULL, N_("invalid caller"));  /* Determine the caller's map if necessary.  This is needed in case     we have a DST, when we don't know the namespace ID we have to put     the new object in, or when the file name has no path in which     case we need to look along the RUNPATH/RPATH of the caller.  */  const char *dst = strchr (file, '$');  if (dst != NULL || args->nsid == __LM_ID_CALLER      || strchr (file, '/') == NULL)    {      const void *caller_dlopen = args->caller_dlopen;      /* We have to find out from which object the caller is calling.	 By default we assume this is the main application.  */      call_map = GL(dl_ns)[LM_ID_BASE]._ns_loaded;      for (Lmid_t ns = 0; ns < DL_NNS; ++ns)	for (l = GL(dl_ns)[ns]._ns_loaded; l != NULL; l = l->l_next)	  if (caller_dlopen >= (const void *) l->l_map_start	      && caller_dlopen < (const void *) l->l_map_end)	    {	      /* There must be exactly one DSO for the range of the virtual		 memory.  Otherwise something is really broken.  */	      assert (ns == l->l_ns);	      call_map = l;	      goto found_caller;	    }    found_caller:      if (args->nsid == __LM_ID_CALLER)	{#ifndef SHARED	  /* In statically linked apps there might be no loaded object.  */	  if (call_map == NULL)	    args->nsid = LM_ID_BASE;	  else#endif	    args->nsid = call_map->l_ns;	}    }  assert (_dl_debug_initialize (0, args->nsid)->r_state == RT_CONSISTENT);  /* Maybe we have to expand a DST.  */  if (__builtin_expect (dst != NULL, 0))    {      size_t len = strlen (file);      size_t required;      char *new_file;      /* DSTs must not appear in SUID/SGID programs.  */      if (INTUSE(__libc_enable_secure))	/* This is an error.  */	_dl_signal_error (0, "dlopen", NULL,			  N_("DST not allowed in SUID/SGID programs"));      /* Determine how much space we need.  We have to allocate the	 memory locally.  */      required = DL_DST_REQUIRED (call_map, file, len, _dl_dst_count (dst, 0));      /* Get space for the new file name.  */      new_file = (char *) alloca (required + 1);      /* Generate the new file name.  */      _dl_dst_substitute (call_map, file, new_file, 0);      /* If the substitution failed don't try to load.  */      if (*new_file == '\0')	_dl_signal_error (0, "dlopen", NULL,			  N_("empty dynamic string token substitution"));      /* Now we have a new file name.  */      file = new_file;      /* It does not matter whether call_map is set even if we	 computed it only because of the DST.  Since the path contains	 a slash the value is not used.  See dl-load.c.  */    }  /* Load the named object.  */  args->map = new = _dl_map_object (call_map, file, 0, lt_loaded, 0,				    mode | __RTLD_CALLMAP, args->nsid);  /* If the pointer returned is NULL this means the RTLD_NOLOAD flag is     set and the object is not already loaded.  */  if (new == NULL)    {      assert (mode & RTLD_NOLOAD);      return;    }  if (__builtin_expect (mode & __RTLD_SPROF, 0))    /* This happens only if we load a DSO for 'sprof'.  */    return;  /* This object is directly loaded.  */  ++new->l_direct_opencount;  /* It was already open.  */  if (__builtin_expect (new->l_searchlist.r_list != NULL, 0))    {      /* Let the user know about the opencount.  */      if (__builtin_expect (GLRO(dl_debug_mask) & DL_DEBUG_FILES, 0))	_dl_debug_printf ("opening file=%s [%lu]; direct_opencount=%u\n\n",			  new->l_name, new->l_ns, new->l_direct_opencount);      /* If the user requested the object to be in the global namespace	 but it is not so far, add it now.  */      if ((mode & RTLD_GLOBAL) && new->l_global == 0)	(void) add_to_global (new);      assert (_dl_debug_initialize (0, args->nsid)->r_state == RT_CONSISTENT);      return;    }  /* Load that object's dependencies.  */  _dl_map_object_deps (new, NULL, 0, 0,		       mode & (__RTLD_DLOPEN | RTLD_DEEPBIND | __RTLD_AUDIT));  /* So far, so good.  Now check the versions.  */  for (i = 0; i < new->l_searchlist.r_nlist; ++i)    if (new->l_searchlist.r_list[i]->l_real->l_versions == NULL)      (void) _dl_check_map_versions (new->l_searchlist.r_list[i]->l_real,				     0, 0);#ifdef SCOPE_DEBUG  show_scope (new);#endif#ifdef SHARED  /* Auditing checkpoint: we have added all objects.  */  if (__builtin_expect (GLRO(dl_naudit) > 0, 0))    {      struct link_map *head = GL(dl_ns)[new->l_ns]._ns_loaded;      /* Do not call the functions for any auditing object.  */      if (head->l_auditing == 0)	{	  struct audit_ifaces *afct = GLRO(dl_audit);	  for (unsigned int cnt = 0; cnt < GLRO(dl_naudit); ++cnt)	    {	      if (afct->activity != NULL)		afct->activity (&head->l_audit[cnt].cookie, LA_ACT_CONSISTENT);	      afct = afct->next;	    }	}    }#endif  /* Notify the debugger all new objects are now ready to go.  */  struct r_debug *r = _dl_debug_initialize (0, args->nsid);  r->r_state = RT_CONSISTENT;  _dl_debug_state ();  /* Only do lazy relocation if `LD_BIND_NOW' is not set.  */  lazy = (mode & RTLD_BINDING_MASK) == RTLD_LAZY && GLRO(dl_lazy);  /* Relocate the objects loaded.  We do this in reverse order so that copy     relocs of earlier objects overwrite the data written by later objects.  */  l = new;  while (l->l_next)    l = l->l_next;  while (1)    {      if (! l->l_real->l_relocated)	{#ifdef SHARED	  if (GLRO(dl_profile) != NULL)	    {	      /* If this here is the shared object which we want to profile		 make sure the profile is started.  We can find out whether	         this is necessary or not by observing the `_dl_profile_map'	         variable.  If was NULL but is not NULL afterwars we must		 start the profiling.  */	      struct link_map *old_profile_map = GL(dl_profile_map);	      _dl_relocate_object (l, l->l_scope, 1, 1);	      if (old_profile_map == NULL && GL(dl_profile_map) != NULL)		{		  /* We must prepare the profiling.  */		  _dl_start_profile ();		  /* Prevent unloading the object.  */		  GL(dl_profile_map)->l_flags_1 |= DF_1_NODELETE;		}	    }	  else#endif	    _dl_relocate_object (l, l->l_scope, lazy, 0);	}      if (l == new)	break;      l = l->l_prev;    }  /* If the file is not loaded now as a dependency, add the search     list of the newly loaded object to the scope.  */  for (i = 0; i < new->l_searchlist.r_nlist; ++i)    {      struct link_map *imap = new->l_searchlist.r_list[i];      /* If the initializer has been called already, the object has	 not been loaded here and now.  */      if (imap->l_init_called && imap->l_type == lt_loaded)	{	  struct r_scope_elem **runp = imap->l_scope;	  size_t cnt = 0;	  while (*runp != NULL)	    {	      ++cnt;	      ++runp;	    }	  if (*runp != NULL)	    /* Avoid duplicates.  */	    continue;	  if (__builtin_expect (cnt + 1 >= imap->l_scope_max, 0))	    {	      /* The 'r_scope' array is too small.  Allocate a new one		 dynamically.  */	      struct r_scope_elem **newp;	      size_t new_size = imap->l_scope_max * 2;	      if (imap->l_scope == imap->l_scope_mem)		{		  newp = (struct r_scope_elem **)		    malloc (new_size * sizeof (struct r_scope_elem *));		  if (newp == NULL)		    _dl_signal_error (ENOMEM, "dlopen", NULL,				      N_("cannot create scope list"));		  imap->l_scope = memcpy (newp, imap->l_scope,					  cnt * sizeof (imap->l_scope[0]));		}	      else		{		  newp = (struct r_scope_elem **)		    realloc (imap->l_scope,			     new_size * sizeof (struct r_scope_elem *));		  if (newp == NULL)		    _dl_signal_error (ENOMEM, "dlopen", NULL,				      N_("cannot create scope list"));		  imap->l_scope = newp;		}	      imap->l_scope_max = new_size;	    }	  imap->l_scope[cnt++] = &new->l_searchlist;	  imap->l_scope[cnt] = NULL;	}#if USE_TLS      /* Only add TLS memory if this object is loaded now and	 therefore is not yet initialized.  */      else if (! imap->l_init_called	       /* Only if the module defines thread local data.  */	       && __builtin_expect (imap->l_tls_blocksize > 0, 0))	{	  /* Now that we know the object is loaded successfully add	     modules containing TLS data to the slot info table.  We	     might have to increase its size.  */	  _dl_add_to_slotinfo (imap);	  if (imap->l_need_tls_init)	    {	      imap->l_need_tls_init = 0;# ifdef SHARED	      /* Update the slot information data for at least the		 generation of the DSO we are allocating data for.  */	      _dl_update_slotinfo (imap->l_tls_modid);# endif	      GL(dl_init_static_tls) (imap);	      assert (imap->l_need_tls_init == 0);	    }	  /* We have to bump the generation counter.  */	  any_tls = true;	}    }  /* Bump the generation number if necessary.  */  if (any_tls && __builtin_expect (++GL(dl_tls_generation) == 0, 0))    _dl_fatal_printf (N_("\TLS generation counter wrapped!  Please report this."));#endif  /* Run the initializer functions of new objects.  */  _dl_init (new, args->argc, args->argv, args->env);  /* Now we can make the new map available in the global scope.  */  if (mode & RTLD_GLOBAL)    /* Move the object in the global namespace.  */    if (add_to_global (new) != 0)      /* It failed.  */      return;  /* Mark the object as not deletable if the RTLD_NODELETE flags was     passed.  */  if (__builtin_expect (mode & RTLD_NODELETE, 0))    new->l_flags_1 |= DF_1_NODELETE;#ifndef SHARED  /* We must be the static _dl_open in libc.a.  A static program that     has loaded a dynamic object now has competition.  */  __libc_multiple_libcs = 1;#endif  /* Let the user know about the opencount.  */  if (__builtin_expect (GLRO(dl_debug_mask) & DL_DEBUG_FILES, 0))    _dl_debug_printf ("opening file=%s [%lu]; direct_opencount=%u\n\n",		      new->l_name, new->l_ns, new->l_direct_opencount);}void *_dl_open (const char *file, int mode, const void *caller_dlopen, Lmid_t nsid,	  int argc, char *argv[], char *env[]){  struct dl_open_args args;  const char *objname;  const char *errstring;  int errcode;  if ((mode & RTLD_BINDING_MASK) == 0)    /* One of the flags must be set.  */    _dl_signal_error (EINVAL, file, NULL, N_("invalid mode for dlopen()"));  /* Make sure we are alone.  */  __rtld_lock_lock_recursive (GL(dl_load_lock));  if (nsid == LM_ID_NEWLM)    {      /* Find a new namespace.  */      for (nsid = 1; nsid < DL_NNS; ++nsid)	if (GL(dl_ns)[nsid]._ns_loaded == NULL)	  break;      if (nsid == DL_NNS)	{	  /* No more namespace available.  */	  __rtld_lock_unlock_recursive (GL(dl_load_lock));	  _dl_signal_error (EINVAL, file, NULL, N_("\no more namespaces available for dlmopen()"));	}      _dl_debug_initialize (0, nsid)->r_state = RT_CONSISTENT;    }  /* Never allow loading a DSO in a namespace which is empty.  Such     direct placements is only causing problems.  Also don't allow     loading into a namespace used for auditing.  */  else if (nsid != LM_ID_BASE && nsid != __LM_ID_CALLER	   && (GL(dl_ns)[nsid]._ns_nloaded == 0	       || GL(dl_ns)[nsid]._ns_loaded->l_auditing))    _dl_signal_error (EINVAL, file, NULL,		      N_("invalid target namespace in dlmopen()"));  args.file = file;  args.mode = mode;  args.caller_dlopen = caller_dlopen;  args.caller_dl_open = RETURN_ADDRESS (0);  args.map = NULL;  args.nsid = nsid;  args.argc = argc;  args.argv = argv;  args.env = env;  errcode = _dl_catch_error (&objname, &errstring, dl_open_worker, &args);#ifndef MAP_COPY  /* We must munmap() the cache file.  */  _dl_unload_cache ();#endif  /* Release the lock.  */  __rtld_lock_unlock_recursive (GL(dl_load_lock));  if (__builtin_expect (errstring != NULL, 0))    {      /* Some error occurred during loading.  */      char *local_errstring;      size_t len_errstring;      /* Remove the object from memory.  It may be in an inconsistent	 state if relocation failed, for example.  */      if (args.map)	{#ifdef USE_TLS	  /* Maybe some of the modules which were loaded use TLS.	     Since it will be removed in the following _dl_close call	     we have to mark the dtv array as having gaps to fill the	     holes.  This is a pessimistic assumption which won't hurt	     if not true.  There is no need to do this when we are	     loading the auditing DSOs since TLS has not yet been set	     up.  */	  if ((mode & __RTLD_AUDIT) == 0)	    GL(dl_tls_dtv_gaps) = true;#endif	  _dl_close (args.map);	}      /* Make a local copy of the error string so that we can release the	 memory allocated for it.  */      len_errstring = strlen (errstring) + 1;      if (objname == errstring + len_errstring)	{	  size_t total_len = len_errstring + strlen (objname) + 1;	  local_errstring = alloca (total_len);	  memcpy (local_errstring, errstring, total_len);	  objname = local_errstring + len_errstring;	}      else	{	  local_errstring = alloca (len_errstring);	  memcpy (local_errstring, errstring, len_errstring);	}      if (errstring != _dl_out_of_memory)	free ((char *) errstring);      assert (_dl_debug_initialize (0, args.nsid)->r_state == RT_CONSISTENT);      /* Reraise the error.  */      _dl_signal_error (errcode, objname, NULL, local_errstring);    }  assert (_dl_debug_initialize (0, args.nsid)->r_state == RT_CONSISTENT);#ifndef SHARED  DL_STATIC_INIT (args.map);#endif  return args.map;}#ifdef SCOPE_DEBUG#include <unistd.h>static voidshow_scope (struct link_map *new){  int scope_cnt;  for (scope_cnt = 0; new->l_scope[scope_cnt] != NULL; ++scope_cnt)    {      char numbuf[2];      unsigned int cnt;      numbuf[0] = '0' + scope_cnt;      numbuf[1] = '\0';      _dl_printf ("scope %s:", numbuf);      for (cnt = 0; cnt < new->l_scope[scope_cnt]->r_nlist; ++cnt)	if (*new->l_scope[scope_cnt]->r_list[cnt]->l_name)	  _dl_printf (" %s", new->l_scope[scope_cnt]->r_list[cnt]->l_name);	else	  _dl_printf (" <main>");      _dl_printf ("\n");    }}#endif