1 files changed, 111 insertions, 0 deletions
diff --git a/elf/reldep.c b/elf/reldep.c
new file mode 100644
index 0000000000..44b239b6c7
--- /dev/null
+++ b/elf/reldep.c
@@ -0,0 +1,111 @@
+#include <dlfcn.h>
+#include <mcheck.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+int
+main (void)
+{
+  void *h1;
+  void *h2;
+  int (*fp) (void);
+  int *vp;
+
+  mtrace ();
+
+  /* Open the two objects.  */
+  h1 = dlopen ("reldepmod1.so", RTLD_LAZY | RTLD_GLOBAL);
+  if (h1 == NULL)
+    {
+      printf ("cannot open reldepmod1.so: %s\n", dlerror ());
+      exit (1);
+    }
+  h2 = dlopen ("reldepmod2.so", RTLD_LAZY);
+  if (h2 == NULL)
+    {
+      printf ("cannot open reldepmod2.so: %s\n", dlerror ());
+      exit (1);
+    }
+
+  /* Get the address of the variable in reldepmod1.so.  */
+  vp = dlsym (h1, "some_var");
+  if (vp == NULL)
+    {
+      printf ("cannot get address of \"some_var\": %s\n", dlerror ());
+      exit (1);
+    }
+
+  *vp = 42;
+
+  /* Get the function `call_me' in the second object.  This has a
+     dependency which is resolved by a definition in reldepmod1.so.  */
+  fp = dlsym (h2, "call_me");
+  if (fp == NULL)
+    {
+      printf ("cannot get address of \"call_me\": %s\n", dlerror ());
+      exit (1);
+    }
+
+  /* Call the function.  */
+  if (fp () != 0)
+    {
+      puts ("function \"call_me\" returned wrong result");
+      exit (1);
+    }
+
+  /* Now close the first object.  If must still be around since we have
+     a implicit dependency.  */
+  if (dlclose (h1) != 0)
+    {
+      printf ("closing h1 failed: %s\n", dlerror ());
+      exit (1);
+    }
+
+  /* Try calling the function again.  This will fail if the first object
+     got unloaded.  */
+  if (fp () != 0)
+    {
+      puts ("second call of function \"call_me\" returned wrong result");
+      exit (1);
+    }
+
+  /* Now close the second file as well.  */
+  if (dlclose (h2) != 0)
+    {
+      printf ("closing h2 failed: %s\n", dlerror ());
+      exit (1);
+    }
+
+  /* Finally, open the first object again.   */
+  h1 = dlopen ("reldepmod1.so", RTLD_LAZY | RTLD_GLOBAL);
+  if (h1 == NULL)
+    {
+      printf ("cannot open reldepmod1.so the second time: %s\n", dlerror ());
+      exit (1);
+    }
+
+  /* And get the variable address again.  */
+  vp = dlsym (h1, "some_var");
+  if (vp == NULL)
+    {
+      printf ("cannot get address of \"some_var\" the second time: %s\n",
+	      dlerror ());
+      exit (1);
+    }
+
+  /* The variable now must have its originial value.  */
+  if (*vp != 0)
+    {
+      puts ("variable \"some_var\" not reset");
+      exit (1);
+    }
+
+  /* Close the first object again, we are done.  */
+  if (dlclose (h1) != 0)
+    {
+      printf ("closing h1 failed: %s\n", dlerror ());
+      exit (1);
+    }
+
+  return 0;
+}