1 /*
2  * Copyright (C) 2013 The Android Open Source Project
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  *      http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 
17 //#define LOG_NDEBUG 0
18 #define LOG_TAG "Drm"
19 
20 #include <dlfcn.h>
21 #include <media/stagefright/foundation/ADebug.h>
22 #include <media/SharedLibrary.h>
23 #include <utils/Log.h>
24 
25 namespace android {
26 
SharedLibrary(const String8 & path)27     SharedLibrary::SharedLibrary(const String8 &path) {
28         mLibHandle = dlopen(path.string(), RTLD_NOW);
29     }
30 
~SharedLibrary()31     SharedLibrary::~SharedLibrary() {
32         if (mLibHandle != NULL) {
33             dlclose(mLibHandle);
34             mLibHandle = NULL;
35         }
36     }
37 
operator !() const38     bool SharedLibrary::operator!() const {
39         return mLibHandle == NULL;
40     }
41 
lookup(const char * symbol) const42     void *SharedLibrary::lookup(const char *symbol) const {
43         if (!mLibHandle) {
44             return NULL;
45         }
46         return dlsym(mLibHandle, symbol);
47     }
48 
lastError() const49     const char *SharedLibrary::lastError() const {
50         const char *error = dlerror();
51         return error ? error : "No errors or unknown error";
52     }
53 
54 };
55