Prepare for radical source tree reorganization.zack/build-layout-experiment

All top-level files and directories are moved into a temporary storage
directory, REORG.TODO, except for files that will certainly still
exist in their current form at top level when we're done (COPYING,
COPYING.LIB, LICENSES, NEWS, README), all old ChangeLog files (which
are moved to the new directory OldChangeLogs, instead), and the
generated file INSTALL (which is just deleted; in the new order, there
will be no generated files checked into version control).

1 files changed, 210 insertions, 0 deletions

diff --git a/REORG.TODO/elf/nodelete.c b/REORG.TODO/elf/nodelete.c
new file mode 100644
index 0000000000..c8d71152f2
--- /dev/null
+++ b/REORG.TODO/elf/nodelete.c
@@ -0,0 +1,210 @@
+#include <dlfcn.h>
+#include <setjmp.h>
+#include <signal.h>
+#include <stdio.h>
+
+
+static sigjmp_buf jmpbuf;
+
+
+int fini_ran;
+
+
+static void
+__attribute__ ((noreturn))
+handler (int sig)
+{
+  siglongjmp (jmpbuf, 1);
+}
+
+
+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;
+
+  if (sigaction (SIGSEGV, &sa, NULL) == -1)
+    printf ("cannot install signal handler: %m\n");
+
+  p = dlopen ("nodelmod1.so", RTLD_LAZY);
+  if (p == NULL)
+    {
+      printf ("failed to load \"nodelmod1.so\": %s\n", dlerror ());
+      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.  */
+	  fini_ran = 0;
+	  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 if (fini_ran != 0)
+		{
+		  puts ("destructor of \"nodelmod1.so\" ran");
+		  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)
+    {
+      printf ("failed to load \"nodelmod2.so\": %s\n", dlerror ());
+      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.  */
+	  fini_ran = 0;
+	  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 if (fini_ran != 0)
+		{
+		  puts ("destructor of \"nodelmod2.so\" ran");
+		  result = 1;
+		}
+	      else
+		puts ("RTLD_NODELETE test succeeded");
+	    }
+	  else
+	    {
+	      /* We caught an segmentation fault.  */
+	      puts ("\"nodelmod2.so\" got deleted");
+	      result = 1;
+	    }
+	}
+    }
+
+  p = dlopen ("nodelmod3.so", RTLD_LAZY);
+  if (p == NULL)
+    {
+      printf ("failed to load \"nodelmod3.so\": %s\n", dlerror ());
+      result = 1;
+    }
+  else
+    {
+      int *(*fctp) (void);
+
+      puts ("succeeded loading \"nodelmod3.so\"");
+
+      fctp = dlsym (p, "addr");
+      if (fctp == NULL)
+	{
+	  puts ("failed to get address of \"addr\" in \"nodelmod3.so\"");
+	  result = 1;
+	}
+      else
+	{
+	  int *varp = fctp ();
+
+	  *varp = -1;
+
+	  /* Now close the object.  */
+	  fini_ran = 0;
+	  if (dlclose (p) != 0)
+	    {
+	      puts ("failed to close \"nodelmod3.so\"");
+	      result = 1;
+	    }
+	  else if (! sigsetjmp (jmpbuf, 1))
+	    {
+	      /* Access the variable again.  */
+	      if (*varp != -1)
+		{
+		  puts ("\"var_in_mod4\" value not correct");
+		  result = 1;
+		}
+	      else if (fini_ran != 0)
+		{
+		  puts ("destructor of \"nodelmod4.so\" ran");
+		  result = 1;
+		}
+	      else
+		puts ("-z nodelete in dependency succeeded");
+	    }
+	  else
+	    {
+	      /* We caught an segmentation fault.  */
+	      puts ("\"nodelmod4.so\" got deleted");
+	      result = 1;
+	    }
+	}
+    }
+
+  return result;
+}
+
+#include <support/test-driver.c>