Home | History | Annotate | Download | only in libdrmutils 
      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