[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>

2 files changed, 14 insertions, 2 deletions

diff --git a/include/dlfcn.h b/include/dlfcn.h
index 8a2f50b..d6111c0 100644
--- a/include/dlfcn.h
+++ b/include/dlfcn.h
@@ -8,6 +8,8 @@
 #define __RTLD_OPENEXEC	0x20000000
 #define __RTLD_CALLMAP	0x10000000
 
+#define __LM_ID_CALLER	-2
+
 /* Now define the internal interfaces.  */
 extern void *__dlvsym (void *__handle, __const char *__name,
 		       __const char *__version);
@@ -31,7 +33,8 @@ libc_hidden_proto (_dl_addr)
 /* Open the shared object NAME, relocate it, and run its initializer if it
    hasn't already been run.  MODE is as for `dlopen' (see <dlfcn.h>).  If
    the object is already opened, returns its existing map.  */
-extern void *_dl_open (const char *name, int mode, const void *caller)
+extern void *_dl_open (const char *name, int mode, const void *caller,
+		       Lmid_t nsid)
      internal_function;
 libc_hidden_proto (_dl_open)
 
diff --git a/include/link.h b/include/link.h
index 1567c67..3078b72 100644
--- a/include/link.h
+++ b/include/link.h
@@ -129,6 +129,14 @@ struct link_map
     /* All following members are internal to the dynamic linker.
        They may change without notice.  */
 
+    /* This is an element which is only ever different from a pointer to
+       the very same copy of this type for ld.so when it is used in more
+       than one namespace.  */
+    struct link_map *l_real;
+
+    /* Number of the namespace this link map belongs to.  */
+    Lmid_t l_ns;
+
     struct libname_list *l_libname;
     /* Indexed pointers to dynamic section.
        [0,DT_NUM) are indexed by the processor-independent tags.
@@ -169,7 +177,8 @@ struct link_map
     Elf_Symndx l_nbuckets;
     const Elf_Symndx *l_buckets, *l_chain;
 
-    unsigned int l_opencount;	/* Reference count for dlopen/dlclose.  */
+    unsigned int l_opencount;	/* Counter for direct and indirect usage.  */
+    unsigned int l_direct_opencount; /* Reference count for dlopen/dlclose.  */
     enum			/* Where this object came from.  */
       {
 	lt_executable,		/* The main executable program.  */