diff -r 7ab5f6318694 -r b16494a69d3d src/os/posix/vm/os_posix.cpp
--- a/src/os/posix/vm/os_posix.cpp	Sun Jan 01 11:17:59 2012 -0500
+++ b/src/os/posix/vm/os_posix.cpp	Tue Jan 03 15:11:31 2012 -0500
@@ -59,6 +59,10 @@
   VMError::report_coredump_status(buffer, success);
 }
 
+int os::get_last_error() {
+  return errno;
+}
+
 bool os::is_debugger_attached() {
   // not implemented
   return false;