Update.

2000-08-26  Ulrich Drepper  <drepper@redhat.com>

	* elf/Makefile (distribute): Add unloadmod.c, reldepmod1.c,
	reldepmod2.c, reldepmod3.c, and reldepmod4.c.
	(tests): Add unload, reldep, reldep2, and reldep3.
	(modules-names): Add unloadmod, reldepmod1, reldepmod2, reldepmod3,
	and reldepmod4.
	Add rules to build and run unload, reldep, reldep2, and reldep3.
	* elf/dl-lookup.c (_dl_lookup_symbol): Add new parameter explicit.
	Don't create relocation dependency if it is nonzero.
	(_dl_lookup_symbol_skip): Remove relocation dependency stuff.  This
	can never happen here.
	(_dl_lookup_versioned_symbol): Add new parameter explicit.
	Don't create relocation dependency if it is nonzero.
	(_dl_lookup_versioned_symbol_skip): Remove relocation dependency
	stuff.  This can never happen here.
	* sysdeps/generic/ldsodefs.h: Change prototypes.
	* elf/dl-reloc.c (RESOLVE_MAP): Pass 0 in explicit parameter to
	_dl_lookup_up and _dl_lookup_versioned_symbol.
	(RESOLV): Likewise.
	* elf/dl-runtime.c (fixup): Likewise.
	(profile_fixup): Likewise.
	* elf/dl-libc.c (do_dlsym): Pass 1 in explicit parameter to
	_dl_lookup_symbol.
	* elf/dl-symbol.c (_dl_symbol_value): Likewise.
	* elf/rtld.c (dl_main): Likewise.
	* elf/dl-sym.c (_dl_sym): Pass 1 in explicit parameter to
	_dl_lookup_symbol if handle is not RTLD_DEFAULT.  Always compute
	and pass down the caller map.
	(_dl_vsym): Likewise.
	* elf/reldep.c: New file.
	* elf/reldep2.c: New file.
	* elf/reldep3.c: New file.
	* elf/reldepmod1.c: New file.
	* elf/reldepmod2.c: New file.
	* elf/reldepmod3.c: New file.
	* elf/reldepmod4.c: New file.
	* elf/unload.c: New file.
	* elf/unloadmod.c: New file.

	* elf/do-lookup.h: Remove unused undef_name parameter.
	* elf/dl-lookup.c: Adjust callers.

1 files changed, 111 insertions, 0 deletions

diff --git a/elf/reldep.c b/elf/reldep.c
new file mode 100644
index 0000000..44b239b
--- /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;
+}