1 /*
2  * Copyright (C) 2019 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 "android.hardware.cas@1.1-SharedLibrary"
19 
20 #include "SharedLibrary.h"
21 #include <dlfcn.h>
22 #include <media/stagefright/foundation/ADebug.h>
23 #include <utils/Log.h>
24 
25 namespace android {
26 namespace hardware {
27 namespace cas {
28 namespace V1_1 {
29 namespace implementation {
30 
SharedLibrary(const String8 & path)31 SharedLibrary::SharedLibrary(const String8& path) {
32     mLibHandle = dlopen(path.string(), RTLD_NOW);
33 }
34 
~SharedLibrary()35 SharedLibrary::~SharedLibrary() {
36     if (mLibHandle != NULL) {
37         dlclose(mLibHandle);
38         mLibHandle = NULL;
39     }
40 }
41 
operator !() const42 bool SharedLibrary::operator!() const {
43     return mLibHandle == NULL;
44 }
45 
lookup(const char * symbol) const46 void* SharedLibrary::lookup(const char* symbol) const {
47     if (!mLibHandle) {
48         return NULL;
49     }
50     // Clear last error before we load the symbol again,
51     // in case the caller didn't retrieve it.
52     (void)dlerror();
53     return dlsym(mLibHandle, symbol);
54 }
55 
lastError() const56 const char* SharedLibrary::lastError() const {
57     const char* error = dlerror();
58     return error ? error : "No errors or unknown error";
59 }
60 
61 }  // namespace implementation
62 }  // namespace V1_1
63 }  // namespace cas
64 }  // namespace hardware
65 }  // namespace android
66