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, 156 insertions, 0 deletions

diff --git a/REORG.TODO/stdlib/tst-tls-atexit.c b/REORG.TODO/stdlib/tst-tls-atexit.c
new file mode 100644
index 0000000000..6dbf49d460
--- /dev/null
+++ b/REORG.TODO/stdlib/tst-tls-atexit.c
@@ -0,0 +1,156 @@
+/* Verify that DSO is unloaded only if its TLS objects are destroyed.
+   Copyright (C) 2013-2017 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, see
+   <http://www.gnu.org/licenses/>.  */
+
+/* For the default case, i.e. NO_DELETE not defined, the test dynamically loads
+   a DSO and spawns a thread that subsequently calls into the DSO to register a
+   destructor for an object in the DSO and then calls dlclose on the handle for
+   the DSO.  When the thread exits, the DSO should not be unloaded or else the
+   destructor called during thread exit will crash.  Further in the main
+   thread, the DSO is opened and closed again, at which point the DSO should be
+   unloaded.
+
+   When NO_DELETE is defined, the DSO is loaded twice, once with just RTLD_LAZY
+   flag and the second time with the RTLD_NODELETE flag set.  The thread is
+   spawned, destructor registered and then thread exits without closing the
+   DSO.  In the main thread, the first handle is then closed, followed by the
+   second handle.  In the end, the DSO should remain loaded due to the
+   RTLD_NODELETE flag being set in the second dlopen call.  */
+
+#include <dlfcn.h>
+#include <pthread.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <string.h>
+#include <errno.h>
+#include <link.h>
+#include <stdbool.h>
+
+#ifndef NO_DELETE
+# define LOADED_IS_GOOD false
+#endif
+
+#ifndef H2_RTLD_FLAGS
+# define H2_RTLD_FLAGS (RTLD_LAZY)
+#endif
+
+#define DSO_NAME "$ORIGIN/tst-tls-atexit-lib.so"
+
+/* Walk through the map in the _r_debug structure to see if our lib is still
+   loaded.  */
+static bool
+is_loaded (void)
+{
+  struct link_map *lm = (struct link_map *) _r_debug.r_map;
+
+  for (; lm; lm = lm->l_next)
+    if (lm->l_type == lt_loaded && lm->l_name
+	&& strcmp (basename (DSO_NAME), basename (lm->l_name)) == 0)
+      {
+	printf ("%s is still loaded\n", lm->l_name);
+	return true;
+      }
+  return false;
+}
+
+/* Accept a valid handle returned by DLOPEN, load the reg_dtor symbol to
+   register a destructor and then call dlclose on the handle.  The dlclose
+   should not unload the DSO since the destructor has not been called yet.  */
+static void *
+reg_dtor_and_close (void *h)
+{
+  void (*reg_dtor) (void) = (void (*) (void)) dlsym (h, "reg_dtor");
+
+  if (reg_dtor == NULL)
+    {
+      printf ("Unable to find symbol: %s\n", dlerror ());
+      return (void *) (uintptr_t) 1;
+    }
+
+  reg_dtor ();
+
+#ifndef NO_DELETE
+  dlclose (h);
+#endif
+
+  return NULL;
+}
+
+static int
+spawn_thread (void *h)
+{
+  pthread_t t;
+  int ret;
+  void *thr_ret;
+
+  if ((ret = pthread_create (&t, NULL, reg_dtor_and_close, h)) != 0)
+    {
+      printf ("pthread_create failed: %s\n", strerror (ret));
+      return 1;
+    }
+
+  if ((ret = pthread_join (t, &thr_ret)) != 0)
+    {
+      printf ("pthread_join failed: %s\n", strerror (ret));
+      return 1;
+    }
+
+  if (thr_ret != NULL)
+    return 1;
+
+  return 0;
+}
+
+static int
+do_test (void)
+{
+  /* Load the DSO.  */
+  void *h1 = dlopen (DSO_NAME, RTLD_LAZY);
+  if (h1 == NULL)
+    {
+      printf ("h1: Unable to load DSO: %s\n", dlerror ());
+      return 1;
+    }
+
+#ifndef NO_DELETE
+  if (spawn_thread (h1) != 0)
+    return 1;
+#endif
+
+  void *h2 = dlopen (DSO_NAME, H2_RTLD_FLAGS);
+  if (h2 == NULL)
+    {
+      printf ("h2: Unable to load DSO: %s\n", dlerror ());
+      return 1;
+    }
+
+#ifdef NO_DELETE
+  if (spawn_thread (h1) != 0)
+    return 1;
+
+  dlclose (h1);
+#endif
+  dlclose (h2);
+
+  /* Check link maps to ensure that the DSO has unloaded.  In the normal case,
+     the DSO should be unloaded if there are no uses.  However, if one of the
+     dlopen calls were with RTLD_NODELETE, the DSO should remain loaded.  */
+  return is_loaded () == LOADED_IS_GOOD ? 0 : 1;
+}
+
+#define TEST_FUNCTION do_test ()
+#include "../test-skeleton.c"