errno: add missing common/errno.h

diff --git a/src/common/errno.h b/src/common/errno.h
new file mode 100644 (file)
index 0000000..9dbd143
--- /dev/null
+++ b/src/common/errno.h
@@ -0,0 +1,9 @@
+#ifndef CEPH_ERRNO_H
+#define CEPH_ERRNO_H
+
+#include <string>
+
+/* Return a given error code as a string */
+std::string cpp_strerror(int err);
+
+#endif