1 /*
2  * Copyright (C) 2017 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 
18 #include "SharedLibrary.h"
19 
20 #include <dlfcn.h>
21 
22 namespace android {
23 namespace hardware {
24 namespace drm {
25 namespace V1_0 {
26 namespace helper {
27 
SharedLibrary(const String8 & path)28 SharedLibrary::SharedLibrary(const String8& path) {
29     mLibHandle = dlopen(path.string(), RTLD_NOW);
30 }
31 
~SharedLibrary()32 SharedLibrary::~SharedLibrary() {
33     if (mLibHandle != NULL) {
34         dlclose(mLibHandle);
35         mLibHandle = NULL;
36     }
37 }
38 
operator !() const39 bool SharedLibrary::operator!() const {
40     return mLibHandle == NULL;
41 }
42 
lookup(const char * symbol) const43 void* SharedLibrary::lookup(const char* symbol) const {
44     if (!mLibHandle) {
45         return NULL;
46     }
47 
48     // Clear last error before we load the symbol again,
49     // in case the caller didn't retrieve it.
50     (void)dlerror();
51     return dlsym(mLibHandle, symbol);
52 }
53 
lastError() const54 const char* SharedLibrary::lastError() const {
55     const char* error = dlerror();
56     return error ? error : "No errors or unknown error";
57 }
58 
59 }
60 }
61 }
62 }
63 } // namespace android
64