Home | History | Annotate | Download | only in xcore 
      1 /*
      2  * analyzer_loader.cpp - analyzer loader
      3  *
      4  *  Copyright (c) 2015 Intel Corporation
      5  *
      6  * Licensed under the Apache License, Version 2.0 (the "License");
      7  * you may not use this file except in compliance with the License.
      8  * You may obtain a copy of the License at
      9  *
     10  *      http://www.apache.org/licenses/LICENSE-2.0
     11  *
     12  * Unless required by applicable law or agreed to in writing, software
     13  * distributed under the License is distributed on an "AS IS" BASIS,
     14  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     15  * See the License for the specific language governing permissions and
     16  * limitations under the License.
     17  *
     18  * Author: Wind Yuan <feng.yuan (at) intel.com>
     19  */
     20 
     21 #include "analyzer_loader.h"
     22 #include <dlfcn.h>
     23 
     24 namespace XCam {
     25 
     26 AnalyzerLoader::AnalyzerLoader (const char *lib_path, const char *symbol)
     27     : _handle (NULL)
     28 {
     29     XCAM_ASSERT (lib_path);
     30     _path = strndup (lib_path, XCAM_MAX_STR_SIZE);
     31     XCAM_ASSERT (symbol);
     32     _symbol = strndup (symbol, XCAM_MAX_STR_SIZE);
     33 }
     34 
     35 AnalyzerLoader::~AnalyzerLoader ()
     36 {
     37     close_handle ();
     38     if (_path)
     39         xcam_free (_path);
     40     if (_symbol)
     41         xcam_free (_symbol);
     42 }
     43 
     44 void *
     45 AnalyzerLoader::load_library (const char *lib_path)
     46 {
     47     void *desc = NULL;
     48 
     49     void *handle = open_handle (lib_path);
     50     //XCAM_ASSERT (handle);
     51     if (!handle) {
     52         XCAM_LOG_WARNING ("open dynamic lib:%s failed", XCAM_STR (lib_path));
     53         return NULL;
     54     }
     55     desc = load_symbol (handle);
     56     if (!desc) {
     57         XCAM_LOG_WARNING ("get symbol(%s) from lib:%s failed", _symbol, XCAM_STR (lib_path));
     58         close_handle ();
     59         return NULL;
     60     }
     61 
     62     XCAM_LOG_DEBUG ("got symbols(%s) from lib(%s)", _symbol, XCAM_STR (lib_path));
     63     return desc;
     64 }
     65 
     66 void*
     67 AnalyzerLoader::open_handle (const char *lib_path)
     68 {
     69     void *handle = NULL;
     70 
     71     if (_handle != NULL)
     72         return _handle;
     73 
     74     handle = dlopen (lib_path, RTLD_LAZY);
     75     if (!handle) {
     76         XCAM_LOG_DEBUG (
     77             "open user-defined lib(%s) failed, reason:%s",
     78             XCAM_STR (lib_path), dlerror ());
     79         return NULL;
     80     }
     81     _handle = handle;
     82     return handle;
     83 }
     84 
     85 void *
     86 AnalyzerLoader::get_symbol (void* handle)
     87 {
     88     void *desc = NULL;
     89 
     90     XCAM_ASSERT (handle);
     91     XCAM_ASSERT (_symbol);
     92     desc = (void *)dlsym (handle, _symbol);
     93     if (!desc) {
     94         XCAM_LOG_DEBUG ("get symbol(%s) failed from lib(%s), reason:%s", _symbol, XCAM_STR (_path), dlerror ());
     95         return NULL;
     96     }
     97 
     98     return desc;
     99 }
    100 
    101 bool
    102 AnalyzerLoader::close_handle ()
    103 {
    104     if (!_handle)
    105         return true;
    106     dlclose (_handle);
    107     _handle = NULL;
    108     return true;
    109 }
    110 
    111 };
    112