Merge branch 'master' of ssh://sources.redhat.com/git/systemtap

1 files changed, 39 insertions, 0 deletions

diff --git a/testsuite/systemtap.context/usymbols.c b/testsuite/systemtap.context/usymbols.c
new file mode 100644
index 00000000..7c590724
--- /dev/null
+++ b/testsuite/systemtap.context/usymbols.c
@@ -0,0 +1,39 @@
+/* usymbol test case
+ * Copyright (C) 2008, Red Hat Inc.
+ *                                                          
+ * This file is part of systemtap, and is free software.  You can
+ * redistribute it and/or modify it under the terms of the GNU General
+ * Public License (GPL); either version 2, or (at your option) any
+ * later version.
+ *
+ * Uses signal to tranfer user space addresses into the kernel where a
+ * probe on sigaction will extract them and produce the symbols.  To
+ * poke into the executable we get the sa_handler from the main executable,
+ * and then the library through calling signal.
+ *
+ * FIXME. We call into the library to get the right symbol. If we
+ * register the handler from the main executable. We need to handle
+ * @plt symbols (setting a handler in the main executable that is in a
+ * shared library will have the @plt address, not the address inside
+ * the shared library).
+ */
+
+#include <signal.h>
+typedef void (*sighandler_t)(int);
+
+// function from our library
+int lib_main (void);
+
+void
+main_handler (int signum)
+{
+  /* dummy handler, just used for the address... */
+}
+
+int
+main (int argc, char *argv[], char *envp[])
+{
+  // Use SIGFPE since we never expect that to be triggered.
+  signal(SIGFPE, main_handler);
+  lib_main();
+}