Update.

	* elf/Makefile (tests): Add $(tests-nodelete-$(have-z-nodelete)).
	(tests-nodelete-yes): Define.
	(modules-names): Add $(modules-nodelete-$(have-z-nodelete)).
	Add rules to build nodelete and modules.
	* elf/nodelete.c: New file.
	* elf/nodelmod1.c: New file.
	* elf/nodelmod2.c: New file.
	* configure.in: Add test for -z nodelete option.
	* config.make.in: Define have-z-nodelete with libc_cv_z_nodelete.

4 files changed, 152 insertions, 2 deletions

diff --git a/elf/Makefile b/elf/Makefile
index 6224c22f6a..db6d4283ba 100644
--- a/elf/Makefile
+++ b/elf/Makefile
@@ -85,13 +85,17 @@ endif
 
 ifeq (yes,$(build-shared))
 tests = loadtest restest1 preloadtest loadfail multiload origtest resolvfail \
-	constload1 order $(tests-vis-$(have-protected)) noload
+	constload1 order $(tests-vis-$(have-protected)) noload \
+	$(tests-nodelete-$(have-z-nodelete))
 tests-vis-yes = vismain
+tests-nodelete-yes = nodelete
 endif
 modules-names = testobj1 testobj2 testobj3 testobj4 testobj5 testobj6 \
 		testobj1_1 failobj constload2 constload3 \
-		dep1 dep2 dep3 dep4 $(modules-vis-$(have-protected))
+		dep1 dep2 dep3 dep4 $(modules-vis-$(have-protected)) \
+		$(modules-nodelete-$(have-z-nodelete))
 modules-vis-yes = vismod1 vismod2 vismod3
+modules-nodelete-yes = nodelmod1 nodelmod2
 extra-objs += $(addsuffix .os,$(strip $(modules-names)))
 
 include ../Rules
@@ -294,3 +298,7 @@ vismain-ENV = LD_PRELOAD=$(addprefix $(objpfx),vismod3.so)
 $(objpfx)noload: $(objpfx)testobj1.so
 LDFLAGS-noload = -rdynamic
 $(objpfx)noload.out: $(objpfx)testobj5.so
+
+LDFLAGS-nodelmod1.so = -Wl,--enable-new-dtags,-z,nodelete
+$(objpfx)nodelete: $(libdl)
+$(objpfx)nodelete.out: $(objpfx)nodelmod1.so $(objpfx)nodelmod2.so
diff --git a/elf/nodelete.c b/elf/nodelete.c
new file mode 100644
index 0000000000..317a2a03e1
--- /dev/null
+++ b/elf/nodelete.c
@@ -0,0 +1,140 @@
+#include <dlfcn.h>
+#include <setjmp.h>
+#include <signal.h>
+#include <stdio.h>
+
+
+static sigjmp_buf jmpbuf;
+
+
+static void
+handler (int sig)
+{
+  siglongjmp (jmpbuf, 1);
+}
+
+
+#define TEST_FUNCTION do_test ()
+static int
+do_test (void)
+{
+  /* We are testing the two possibilities to mark an object as not deletable:
+     - marked on the linker commandline with `-z nodelete'
+     - with the RTLD_NODELETE flag at dlopen()-time.
+
+     The test we are performing should be safe.  We are loading the objects,
+     get the address of variables in the respective object, unload the object
+     and then try to read the variable.  If the object is unloaded this
+     should lead to an segmentation fault.  */
+  int result = 0;
+  void *p;
+  struct sigaction sa;
+
+  sa.sa_handler = handler;
+  sigfillset (&sa.sa_mask);
+  sa.sa_flags = SA_RESTART;
+  sa.sa_restorer = NULL;
+
+  if (sigaction (SIGSEGV, &sa, NULL) == -1)
+    printf ("cannot install signal handler: %m\n");
+
+  p = dlopen ("nodelmod1.so", RTLD_LAZY);
+  if (p == NULL)
+    {
+      puts ("failed to load \"nodelmod1.so\"");
+      result = 1;
+    }
+  else
+    {
+      int *varp;
+
+      puts ("succeeded loading \"nodelmod1.so\"");
+
+      varp = dlsym (p, "var1");
+      if (varp == NULL)
+	{
+	  puts ("failed to get address of \"var1\" in \"nodelmod1.so\"");
+	  result = 1;
+	}
+      else
+	{
+	  *varp = 20000720;
+
+	  /* Now close the object.  */
+	  if (dlclose (p) != 0)
+	    {
+	      puts ("failed to close \"nodelmod1.so\"");
+	      result = 1;
+	    }
+	  else if (! sigsetjmp (jmpbuf, 1))
+	    {
+	      /* Access the variable again.  */
+	      if (*varp != 20000720)
+		{
+		  puts ("\"var1\" value not correct");
+		  result = 1;
+		}
+	      else
+		puts ("-z nodelete test succeeded");
+	    }
+	  else
+	    {
+	      /* We caught an segmentation fault.  */
+	      puts ("\"nodelmod1.so\" got deleted");
+	      result = 1;
+	    }
+	}
+    }
+
+  p = dlopen ("nodelmod2.so", RTLD_LAZY | RTLD_NODELETE);
+  if (p == NULL)
+    {
+      puts ("failed to load \"nodelmod2.so\"");
+      result = 1;
+    }
+  else
+    {
+      int *varp;
+
+      puts ("succeeded loading \"nodelmod2.so\"");
+
+      varp = dlsym (p, "var2");
+      if (varp == NULL)
+	{
+	  puts ("failed to get address of \"var2\" in \"nodelmod2.so\"");
+	  result = 1;
+	}
+      else
+	{
+	  *varp = 42;
+
+	  /* Now close the object.  */
+	  if (dlclose (p) != 0)
+	    {
+	      puts ("failed to close \"nodelmod2.so\"");
+	      result = 1;
+	    }
+	  else if (! sigsetjmp (jmpbuf, 1))
+	    {
+	      /* Access the variable again.  */
+	      if (*varp != 42)
+		{
+		  puts ("\"var2\" value not correct");
+		  result = 1;
+		}
+	      else
+		puts ("RTLD_NODELETE test succeeded");
+	    }
+	  else
+	    {
+	      /* We caught an segmentation fault.  */
+	      puts ("\"nodelmod2.so\" got deleted");
+	      result = 1;
+	    }
+	}
+    }
+
+  return result;
+}
+
+#include "../test-skeleton.c"
diff --git a/elf/nodelmod1.c b/elf/nodelmod1.c
new file mode 100644
index 0000000000..abae539a6c
--- /dev/null
+++ b/elf/nodelmod1.c
@@ -0,0 +1 @@
+int var1 = 42;
diff --git a/elf/nodelmod2.c b/elf/nodelmod2.c
new file mode 100644
index 0000000000..1dd16e5071
--- /dev/null
+++ b/elf/nodelmod2.c
@@ -0,0 +1 @@
+int var2 = 100;