[BZ #77]

Update.
	Add support for namespaces in the dynamic linker.
	* dlfcn/Makefile (libdl-routines): Add dlmopen.
	* dlfcn/Versions [libdl, GLIBC_2.3.4]: Add dlmopen.
	* dlfcn/dlfcn.h: Define Lmid_t, LM_ID_BASE, and LM_ID_NEWLM.
	Declare dlmopen.  Document RTLD_DI_LMID.
	* dlfcn/dlinfo.c: Handle RTLD_DI_LMID.
	* dlfcn/dlmopen.c: New file.
	* dlfcn/dlopen.c: Pass new parameter to _dl_open.
	* dlfcn/dlopenold.c: Likewise.
	* elf/dl-addr.c: Adjust for removal of GL(dl_loaded).
	* elf/dl-caller.c: Likewise.
	* elf/dl-close.c: Likewise.
	* elf/dl-conflict.c: Likewise.
	* elf/dl-debug.c: Likewise.
	* elf/dl-lookup.c: Likewise.
	* elf/dl-sym.c: Likewise.
	* elf/dl-version.c: Likewise.
	* elf/do-lookup.h: Likewise.
	* elf/rtld.c: Likewise.
	* sysdeps/unix/sysv/linux/i386/dl-librecon.h: Likewise.
	* elf/dl-depsc: Likewise.  Add new parameter to _dl_map_object.
	* elf/dl-fini.c: Call destructors in all namespaces.
	* elf/dl-iteratephdr.c: Compute total nloaded.  Adjust for removal of
	GL(dl_loaded).
	* elf/dl-libc.c: Pass new parameter to _dl_open.  Adjust for removal
	of GL(dl_loaded).
	* elf/dl-load.c (_dl_map_object_from_fd): Don't load ld.so a second
	time.  Reuse the one from the main namespace in all others.
	Pass new parameter to _dl_new_object.
	Adjust for removal of GL(dl_loaded).
	* elf/dl-object.c: Take new parameter.  Use it to initialize l_ns.
	Adjust for removal of GL(dl_loaded).
	* elf/dl-open.c (_dl_open): Take new parameter.
	Adjust for removal of GL(dl_loaded).
	* elf/dl-support.c: Replace global _dl_loaded etc variables with
	_dl_ns variable.
	* include/dlfcn.h: Adjust prototype of _dl_open.
	Define __LM_ID_CALLER.
	* include/link.h: Add l_real, l_ns, and l_direct_opencount elements.
	* sysdeps/generic/dl-tls.c: Bump TLS_STATIC_SURPLUS.  Since libc is
	using TLS we need memory appropriate to the number of namespaces.
	* sysdeps/generic/ldsodefs.h (struct rtld_global): Replace _dl_loaded,
	_dl_nloaded, _dl_global_scope, _dl_main_searchlist, and
	_dl_global_scope_alloc with _dl_ns element.  Define DL_NNS.
	Adjust prototypes of _dl_map_object and member in rtld_global_ro.
	* malloc/malloc.c: Include <dlfcn.h>.
	* malloc/arena.c (ptmalloc_init): If libc is not in primary namespace,
	never use brk.
	* elf/Makefile: Add rules to build and run tst-dlmopen1 and
	tst-dlmopen2.
	* elf/tst-dlmopen1.c: New file.
	* elf/tst-dlmopen1mod.c: New file.
	* elf/tst-dlmopen2.c: New file.

	* elf/dl-close.c: Improve reference counting by tracking direct loads.
	* elf/dl-lookup.c (add_dependency): Likewise.
	* elf/dl-open.c (dl_open_worker): Likewise.
	* elf/rtld.c (dl_main): Likewise.

2004-09-09  GOTO Masanori  <gotom@debian.or.jp>

	[BZ #77]
	* elf/dl-close.c: Count down l_opencount to check not only for
	l_reldeps, but also l_initfini.

2004-10-13  Ulrich Drepper  <drepper@redhat.com>

3 files changed, 29 insertions, 19 deletions

diff --git a/sysdeps/generic/dl-tls.c b/sysdeps/generic/dl-tls.c
index 4fe67da4e1..bf3592e292 100644
--- a/sysdeps/generic/dl-tls.c
+++ b/sysdeps/generic/dl-tls.c
@@ -33,7 +33,7 @@
 
 /* Amount of excess space to allocate in the static TLS area
    to allow dynamic loading of modules defining IE-model TLS data.  */
-# define TLS_STATIC_SURPLUS	64
+# define TLS_STATIC_SURPLUS	64 + DL_NNS * 100
 
 /* Value used for dtv entries for which the allocation is delayed.  */
 # define TLS_DTV_UNALLOCATED	((void *) -1l)
diff --git a/sysdeps/generic/ldsodefs.h b/sysdeps/generic/ldsodefs.h
index 2b526867ad..f1062e7fa6 100644
--- a/sysdeps/generic/ldsodefs.h
+++ b/sysdeps/generic/ldsodefs.h
@@ -216,18 +216,27 @@ struct rtld_global
   /* Don't change the order of the following elements.  'dl_loaded'
      must remain the first element.  Forever.  */
 
-  /* And a pointer to the map for the main map.  */
-  EXTERN struct link_map *_dl_loaded;
-  /* Number of object in the _dl_loaded list.  */
-  EXTERN unsigned int _dl_nloaded;
-  /* Array representing global scope.  */
-  EXTERN struct r_scope_elem *_dl_global_scope[2];
-  /* Direct pointer to the searchlist of the main object.  */
-  EXTERN struct r_scope_elem *_dl_main_searchlist;
-  /* This is zero at program start to signal that the global scope map is
-     allocated by rtld.  Later it keeps the size of the map.  It might be
-     reset if in _dl_close if the last global object is removed.  */
-  EXTERN size_t _dl_global_scope_alloc;
+/* Non-shared code has no support for multiple namespaces.  */
+#ifdef SHARED
+# define DL_NNS 16
+#else
+# define DL_NNS 1
+#endif
+  EXTERN struct link_namespaces
+  {
+    /* And a pointer to the map for the main map.  */
+    struct link_map *_ns_loaded;
+    /* Number of object in the _dl_loaded list.  */
+    unsigned int _ns_nloaded;
+    /* Array representing global scope.  */
+    struct r_scope_elem *_ns_global_scope[2];
+    /* Direct pointer to the searchlist of the main object.  */
+    struct r_scope_elem *_ns_main_searchlist;
+    /* This is zero at program start to signal that the global scope map is
+       allocated by rtld.  Later it keeps the size of the map.  It might be
+       reset if in _dl_close if the last global object is removed.  */
+    size_t _ns_global_scope_alloc;
+  } _dl_ns[DL_NNS];
 
   /* During the program run we must not modify the global data of
      loaded shared object simultanously in two threads.  Therefore we
@@ -477,7 +486,7 @@ struct rtld_global_ro
   char *(*_dl_dst_substitute) (struct link_map *, const char *, char *, int);
   struct link_map *(internal_function *_dl_map_object) (struct link_map *,
 							const char *, int,
-							int, int, int);
+							int, int, int, Lmid_t);
   void (internal_function *_dl_map_object_deps) (struct link_map *,
 						 struct link_map **,
 						 unsigned int, int, int);
@@ -658,7 +667,8 @@ extern void _dl_receive_error (receiver_fct fct, void (*operate) (void *),
    value to allow additional security checks.  */
 extern struct link_map *_dl_map_object (struct link_map *loader,
 					const char *name, int preloaded,
-					int type, int trace_mode, int mode)
+					int type, int trace_mode, int mode,
+					Lmid_t nsid)
      internal_function attribute_hidden;
 
 /* Call _dl_map_object on the dependencies of MAP, and set up
@@ -723,7 +733,7 @@ extern ElfW(Addr) _dl_symbol_value (struct link_map *map, const char *name)
    and enter it into the _dl_main_map list.  */
 extern struct link_map *_dl_new_object (char *realname, const char *libname,
 					int type, struct link_map *loader,
-					int mode)
+					int mode, Lmid_t nsid)
      internal_function attribute_hidden;
 
 /* Relocate the given object (if it hasn't already been).
diff --git a/sysdeps/unix/sysv/linux/i386/dl-librecon.h b/sysdeps/unix/sysv/linux/i386/dl-librecon.h
index 5e41977dde..9f52031518 100644
--- a/sysdeps/unix/sysv/linux/i386/dl-librecon.h
+++ b/sysdeps/unix/sysv/linux/i386/dl-librecon.h
@@ -28,15 +28,15 @@
       /* We have to find out whether the binary is linked against	      \
 	 libc 5 or glibc.  We do this by looking at all the DT_NEEDED	      \
 	 entries.  If one is libc.so.5 this is a libc 5 linked binary.  */    \
-      if (GL(dl_loaded)->l_info[DT_NEEDED])				      \
+      if (main_map->l_info[DT_NEEDED])					      \
 	{								      \
 	  /* We have dependencies.  */					      \
 	  const ElfW(Dyn) *d;						      \
 	  const char *strtab;						      \
 									      \
-	  strtab = (const char *) D_PTR (GL(dl_loaded), l_info[DT_STRTAB]);   \
+	  strtab = (const char *) D_PTR (main_map, l_info[DT_STRTAB]);	      \
 									      \
-	  for (d = GL(dl_loaded)->l_ld; d->d_tag != DT_NULL; ++d)	      \
+	  for (d = main_map->l_ld; d->d_tag != DT_NULL; ++d)		      \
 	    if (d->d_tag == DT_NEEDED					      \
 		&& strcmp (strtab + d->d_un.d_val, "libc.so.5") == 0)	      \
 	      break;							      \