[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>

7 files changed, 114 insertions, 8 deletions

diff --git a/dlfcn/Makefile b/dlfcn/Makefile
index 8ac1c20..4330a8a 100644
--- a/dlfcn/Makefile
+++ b/dlfcn/Makefile
@@ -19,7 +19,8 @@
 subdir		:= dlfcn
 headers		:= bits/dlfcn.h dlfcn.h
 extra-libs	:= libdl
-libdl-routines	:= dlopen dlclose dlsym dlvsym dlerror dladdr dladdr1 dlinfo
+libdl-routines	:= dlopen dlclose dlsym dlvsym dlerror dladdr dladdr1 dlinfo \
+		   dlmopen
 distribute	:= dlopenold.c glreflib1.c glreflib2.c failtestmod.c \
 		   defaultmod1.c defaultmod2.c errmsg1mod.c modatexit.c \
 		   modcxaatexit.c modstatic.c \
diff --git a/dlfcn/Versions b/dlfcn/Versions
index 95ede25..6a41c23 100644
--- a/dlfcn/Versions
+++ b/dlfcn/Versions
@@ -8,4 +8,7 @@ libdl {
   GLIBC_2.3.3 {
     dladdr1; dlinfo;
   }
+  GLIBC_2.3.4 {
+    dlmopen;
+  }
 }
diff --git a/dlfcn/dlfcn.h b/dlfcn/dlfcn.h
index 9d8ee0d..9383c23 100644
--- a/dlfcn/dlfcn.h
+++ b/dlfcn/dlfcn.h
@@ -1,5 +1,5 @@
 /* User functions for run-time dynamic loading.
-   Copyright (C) 1995-1999,2000,2001,2003 Free Software Foundation, Inc.
+   Copyright (C) 1995-1999,2000,2001,2003,2004 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
 
    The GNU C Library is free software; you can redistribute it and/or
@@ -39,6 +39,14 @@
    the run-time address of the symbol called NAME in the global scope
    is returned.  */
 # define RTLD_DEFAULT	((void *) 0)
+
+
+/* Type for namespace indeces.  */
+typedef long int Lmid_t;
+
+/* Special namespace ID values.  */
+# define LM_ID_BASE	0	/* Initial namespace.  */
+# define LM_ID_NEWLM	-1	/* For dlmopen: request new namespace.  */
 #endif
 
 
@@ -58,6 +66,9 @@ extern void *dlsym (void *__restrict __handle,
 		    __const char *__restrict __name) __THROW;
 
 #ifdef __USE_GNU
+/* Like `dlopen', but request object to be allocated in a new namespace.  */
+extern void *dlmopen (Lmid_t __nsid, __const char *__file, int __mode) __THROW;
+
 /* Find the run-time address in the shared object HANDLE refers to
    of the symbol called NAME with VERSION.  */
 extern void *dlvsym (void *__restrict __handle,
@@ -114,6 +125,9 @@ extern int dlinfo (void *__restrict __handle,
 /* These are the possible values for the REQUEST argument to `dlinfo'.  */
 enum
   {
+    /* Treat ARG as `lmid_t *'; store namespace ID for HANDLE there.  */
+    RTLD_DI_LMID = 1,
+
     /* Treat ARG as `struct link_map **';
        store the `struct link_map *' for HANDLE there.  */
     RTLD_DI_LINKMAP = 2,
@@ -130,7 +144,6 @@ enum
        expand $ORIGIN in this shared object's dependency file names.  */
     RTLD_DI_ORIGIN = 6,
 
-    RTLD_DI_LMID = 1,		/* Unsupported, defined by Solaris.  */
     RTLD_DI_CONFIGADDR = 3	/* Unsupported, defined by Solaris.  */
   };
 
diff --git a/dlfcn/dlinfo.c b/dlfcn/dlinfo.c
index 7e7f1c7..4e755ad 100644
--- a/dlfcn/dlinfo.c
+++ b/dlfcn/dlinfo.c
@@ -55,12 +55,15 @@ RTLD_SELF used in code not dynamically loaded"));
 
   switch (args->request)
     {
-    case RTLD_DI_LMID:
     case RTLD_DI_CONFIGADDR:
     default:
       GLRO(dl_signal_error) (0, NULL, NULL, N_("unsupported dlinfo request"));
       break;
 
+    case RTLD_DI_LMID:
+      *(Lmid_t *) args->arg = l->l_ns;
+      break;
+
     case RTLD_DI_LINKMAP:
       *(struct link_map **) args->arg = l;
       break;
diff --git a/dlfcn/dlmopen.c b/dlfcn/dlmopen.c
new file mode 100644
index 0000000..fb2a50b
--- /dev/null
+++ b/dlfcn/dlmopen.c
@@ -0,0 +1,69 @@
+/* Load a shared object at run time.
+   Copyright (C) 1995,96,97,98,99,2000,2003,2004 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library 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 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library 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 the GNU C Library; if not, write to the Free
+   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+   02111-1307 USA.  */
+
+#include <dlfcn.h>
+#include <errno.h>
+#include <libintl.h>
+#include <stddef.h>
+#include <ldsodefs.h>
+
+struct dlmopen_args
+{
+  /* Namespace ID.  */
+  Lmid_t nsid;
+  /* The arguments for dlopen_doit.  */
+  const char *file;
+  int mode;
+  /* The return value of dlopen_doit.  */
+  void *new;
+  /* Address of the caller.  */
+  const void *caller;
+};
+
+static void
+dlmopen_doit (void *a)
+{
+  struct dlmopen_args *args = (struct dlmopen_args *) a;
+
+  /* Non-shared code has no support for multiple namespaces.  */
+  if (args->nsid != LM_ID_BASE)
+#ifdef SHARED
+    /* If trying to open the link map for the main executable the namespace
+       must be the main one.  */
+    if (args->file == NULL)
+#endif
+      GLRO(dl_signal_error) (EINVAL, NULL, NULL, N_("invalid namespace"));
+
+  args->new = _dl_open (args->file ?: "", args->mode | __RTLD_DLOPEN,
+			args->caller, args->nsid);
+}
+
+
+void *
+dlmopen (Lmid_t nsid, const char *file, int mode)
+{
+  struct dlmopen_args args;
+  args.nsid = nsid;
+  args.file = file;
+  args.mode = mode;
+  args.caller = RETURN_ADDRESS (0);
+
+  return _dlerror_run (dlmopen_doit, &args) ? NULL : args.new;
+}
+static_link_warning (dlmopen)
diff --git a/dlfcn/dlopen.c b/dlfcn/dlopen.c
index 4ebfb0c..cfd7963 100644
--- a/dlfcn/dlopen.c
+++ b/dlfcn/dlopen.c
@@ -1,5 +1,5 @@
 /* Load a shared object at run time.
-   Copyright (C) 1995,96,97,98,99,2000,2003 Free Software Foundation, Inc.
+   Copyright (C) 1995,96,97,98,99,2000,2003,2004 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
 
    The GNU C Library is free software; you can redistribute it and/or
@@ -31,13 +31,22 @@ struct dlopen_args
   const void *caller;
 };
 
+
+/* Non-shared code has no support for multiple namespaces.  */
+#ifdef SHARED
+# define NS __LM_ID_CALLER
+#else
+# define NS LM_ID_BASE
+#endif
+
+
 static void
 dlopen_doit (void *a)
 {
   struct dlopen_args *args = (struct dlopen_args *) a;
 
   args->new = _dl_open (args->file ?: "", args->mode | __RTLD_DLOPEN,
-			args->caller);
+			args->caller, args->file == NULL ? LM_ID_BASE : NS);
 }
 
 
diff --git a/dlfcn/dlopenold.c b/dlfcn/dlopenold.c
index b83d64d..f10674a 100644
--- a/dlfcn/dlopenold.c
+++ b/dlfcn/dlopenold.c
@@ -1,5 +1,5 @@
 /* Load a shared object at run time.
-   Copyright (C) 1995-1999, 2000 Free Software Foundation, Inc.
+   Copyright (C) 1995-1999, 2000, 2004 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
 
    The GNU C Library is free software; you can redistribute it and/or
@@ -37,13 +37,21 @@ struct dlopen_args
 };
 
 
+/* Non-shared code has no support for multiple namespaces.  */
+#ifdef SHARED
+# define NS __LM_ID_CALLER
+#else
+# define NS LM_ID_BASE
+#endif
+
+
 static void
 dlopen_doit (void *a)
 {
   struct dlopen_args *args = (struct dlopen_args *) a;
 
   args->new = _dl_open (args->file ?: "", args->mode | __RTLD_DLOPEN,
-			args->caller);
+			args->caller, args->file == NULL ? LM_ID_BASE : NS);
 }
 
 extern void *__dlopen_nocheck (const char *file, int mode);