From c18e2b649691e393f0c6e0fcd9af288b68d7d9b5 Mon Sep 17 00:00:00 2001
From: Patrick Venture <venture@google.com>
Date: Wed, 21 Nov 2018 14:19:28 -0800
Subject: add dynamic library interface to enable testing

Add interface defining the methods for dynamic linking to enable
testing.

Change-Id: If4d090d3cedc019b426435a1f651191803bfc1a9
Signed-off-by: Patrick Venture <venture@google.com>
---
 internal/sys.hpp | 54 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 54 insertions(+)
 create mode 100644 internal/sys.hpp

(limited to 'internal/sys.hpp')

diff --git a/internal/sys.hpp b/internal/sys.hpp
new file mode 100644
index 0000000..e0a02bf
--- /dev/null
+++ b/internal/sys.hpp
@@ -0,0 +1,54 @@
+#pragma once
+
+namespace blobs
+{
+
+namespace internal
+{
+/**
+ * Interface to the dynamic library loader.
+ */
+class DlSysInterface
+{
+  public:
+    virtual ~DlSysInterface() = default;
+
+    /**
+     * obtain error diagnostic for functions in the dlopen API
+     *
+     * @return the error details
+     */
+    virtual const char* dlerror() const = 0;
+
+    /**
+     * open a shared object
+     *
+     * @param[in] filename - the path to the shared object or the filename to
+     * for searching
+     * @param[in] flags - the flags
+     * @return a handle to the shared object (null on failure)
+     */
+    virtual void* dlopen(const char* filename, int flags) const = 0;
+
+    /**
+     * obtain address of a symbol in a shared object or executable
+     *
+     * @param[in] handle - pointer to shared object
+     * @param[in] symbol - name of the symbol to find
+     * @return the address of the symbol if found (null otherwise)
+     */
+    virtual void* dlsym(void* handle, const char* symbol) const = 0;
+};
+
+class DlSysImpl : public DlSysInterface
+{
+  public:
+    const char* dlerror() const override;
+    void* dlopen(const char* filename, int flags) const override;
+    void* dlsym(void* handle, const char* symbol) const override;
+};
+
+extern DlSysImpl dlsys_impl;
+
+} // namespace internal
+} // namespace blobs
-- 
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