1 files changed, 76 insertions, 0 deletions
diff --git a/net/host_resolver_helper/dyn_lib_loader.cc b/net/host_resolver_helper/dyn_lib_loader.cc
new file mode 100644
index 0000000..043e81a
--- /dev/null
+++ b/net/host_resolver_helper/dyn_lib_loader.cc
@@ -0,0 +1,76 @@
+/** ---------------------------------------------------------------------------
+ Copyright (c) 2011, Code Aurora Forum. All rights reserved.
+
+ Redistribution and use in source and binary forms, with or without
+ modification, are permitted provided that the following conditions are
+ met:
+     * Redistributions of source code must retain the above copyright
+       notice, this list of conditions and the following disclaimer.
+     * Redistributions in binary form must reproduce the above
+       copyright notice, this list of conditions and the following
+       disclaimer in the documentation and/or other materials provided
+       with the distribution.
+     * Neither the name of Code Aurora Forum, Inc. nor the names of its
+       contributors may be used to endorse or promote products derived
+       from this software without specific prior written permission.
+
+ THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
+ WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT
+ ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
+ BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
+ BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
+ OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
+ IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ -----------------------------------------------------------------------------**/
+#include "dyn_lib_loader.h"
+
+LibraryManager* LibraryManager::GetInstance() {
+    static LibraryManager mgr;
+    return &mgr;
+}
+
+LibraryManager::~LibraryManager() {
+    for (LibDictionary::iterator it = libdict.begin(); it != libdict.end();
+            it++) {
+        if (it->second) {
+            ReleaseLibraryModule(it->second);
+        }
+    }
+}
+
+LibraryManager::MODULE_HANDLE_TYPE LibraryManager::GetLibraryHandleInternal(const std::string& libname) {
+    LibHandle& handle = libdict[libname];
+    if (NULL == handle) {
+        //load module
+        handle = LoadLibraryModule(libname);
+    }
+    return handle;
+}
+
+void* LibraryManager::GetSymbolInternal(const std::string& libname,    const std::string& symbol) {
+    return LoadLibrarySymbol(GetLibraryHandleInternal(libname), symbol);
+}
+
+void * LibraryManager::LoadLibrarySymbol(const MODULE_HANDLE_TYPE& lh,
+        const std::string& symname) {
+    void* symptr = NULL;
+    if (lh) {
+        symptr = dlsym(lh, symname.c_str());
+    }
+    return symptr;
+}
+
+LibraryManager::MODULE_HANDLE_TYPE LibraryManager::LoadLibraryModule(const std::string& libname) {
+    return dlopen(libname.c_str(), RTLD_LAZY);
+}
+
+void LibraryManager::ReleaseLibraryModule(const MODULE_HANDLE_TYPE& lh) {
+    if (lh) {
+        dlclose(lh);
+    }
+}
+