1 /* 2 * Copyright (c) 2017, The Linux Foundation. All rights reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions are 6 * met: 7 * * Redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer. 9 * * Redistributions in binary form must reproduce the above 10 * copyright notice, this list of conditions and the following 11 * disclaimer in the documentation and/or other materials provided 12 * with the distribution. 13 * * Neither the name of The Linux Foundation nor the names of its 14 * contributors may be used to endorse or promote products derived 15 * from this software without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED 18 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 19 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS 21 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 22 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 23 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR 24 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 25 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE 26 * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN 27 * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 28 */ 29 30 #include <dlfcn.h> 31 32 #include "drm_lib_loader.h" 33 34 #define __CLASS__ "DRMLibLoader" 35 36 using std::mutex; 37 using std::lock_guard; 38 39 namespace drm_utils { 40 41 DRMLibLoader *DRMLibLoader::s_instance = nullptr; 42 mutex DRMLibLoader::s_lock; 43 44 DRMLibLoader *DRMLibLoader::GetInstance() { 45 lock_guard<mutex> obj(s_lock); 46 47 if (!s_instance) { 48 s_instance = new DRMLibLoader(); 49 } 50 51 return s_instance; 52 } 53 54 void DRMLibLoader::Destroy() { 55 lock_guard<mutex> obj(s_lock); 56 if (s_instance) { 57 delete s_instance; 58 s_instance = nullptr; 59 } 60 } 61 62 DRMLibLoader::DRMLibLoader() { 63 if (Open("libsdedrm.so")) { 64 if (Sym("GetDRMManager", reinterpret_cast<void **>(&func_get_drm_manager_)) && 65 Sym("DestroyDRMManager", reinterpret_cast<void **>(&func_destroy_drm_manager_))) { 66 is_loaded_ = true; 67 } 68 } 69 } 70 71 DRMLibLoader::~DRMLibLoader() { 72 if (lib_) { 73 ::dlclose(lib_); 74 lib_ = nullptr; 75 } 76 } 77 78 bool DRMLibLoader::Open(const char *lib_name) { 79 lib_ = ::dlopen(lib_name, RTLD_NOW); 80 81 return (lib_ != nullptr); 82 } 83 84 bool DRMLibLoader::Sym(const char *func_name, void **func_ptr) { 85 if (lib_) { 86 *func_ptr = ::dlsym(lib_, func_name); 87 } 88 89 return (*func_ptr != nullptr); 90 } 91 92 } // namespace drm_utils 93