1 /* Copyright (c) 2017, The Linux Foundation. All rights reserved.
2 *
3 * Redistribution and use in source and binary forms, with or without
4 * modification, are permitted provided that the following conditions are
5 * met:
6 * * Redistributions of source code must retain the above copyright
7 * notice, this list of conditions and the following disclaimer.
8 * * Redistributions in binary form must reproduce the above
9 * copyright notice, this list of conditions and the following
10 * disclaimer in the documentation and/or other materials provided
11 * with the distribution.
12 * * Neither the name of The Linux Foundation, nor the names of its
13 * contributors may be used to endorse or promote products derived
14 * from this software without specific prior written permission.
15 *
16 * THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
17 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
18 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
20 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
23 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
24 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
25 * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
26 * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 *
28 */
29 #define LOG_TAG "DataItemsFactoryProxy"
30
31 #include <dlfcn.h>
32 #include <DataItemId.h>
33 #include <IDataItemCore.h>
34 #include <DataItemsFactoryProxy.h>
35 #include <loc_pla.h>
36 #include <log_util.h>
37
38 namespace loc_core
39 {
40 void* DataItemsFactoryProxy::dataItemLibHandle = NULL;
41 get_concrete_data_item_fn* DataItemsFactoryProxy::getConcreteDIFunc = NULL;
42
createNewDataItem(DataItemId id)43 IDataItemCore* DataItemsFactoryProxy::createNewDataItem(DataItemId id)
44 {
45 IDataItemCore *mydi = nullptr;
46
47 if (NULL != getConcreteDIFunc) {
48 mydi = (*getConcreteDIFunc)(id);
49 }
50 else {
51 // first call to this function, symbol not yet loaded
52 if (NULL == dataItemLibHandle) {
53 LOC_LOGD("Loaded library %s",DATA_ITEMS_LIB_NAME);
54 dataItemLibHandle = dlopen(DATA_ITEMS_LIB_NAME, RTLD_NOW);
55 if (NULL == dataItemLibHandle) {
56 // dlopen failed.
57 const char * err = dlerror();
58 if (NULL == err)
59 {
60 err = "Unknown";
61 }
62 LOC_LOGE("%s:%d]: failed to load library %s; error=%s",
63 __func__, __LINE__, DATA_ITEMS_LIB_NAME, err);
64 }
65 }
66
67 // load sym - if dlopen handle is obtained and symbol is not yet obtained
68 if (NULL != dataItemLibHandle) {
69 getConcreteDIFunc = (get_concrete_data_item_fn * )
70 dlsym(dataItemLibHandle, DATA_ITEMS_GET_CONCRETE_DI);
71 if (NULL != getConcreteDIFunc) {
72 LOC_LOGD("Loaded function %s : %p",DATA_ITEMS_GET_CONCRETE_DI,getConcreteDIFunc);
73 mydi = (*getConcreteDIFunc)(id);
74 }
75 else {
76 // dlysm failed.
77 const char * err = dlerror();
78 if (NULL == err)
79 {
80 err = "Unknown";
81 }
82 LOC_LOGE("%s:%d]: failed to find symbol %s; error=%s",
83 __func__, __LINE__, DATA_ITEMS_GET_CONCRETE_DI, err);
84 }
85 }
86 }
87 return mydi;
88 }
89
closeDataItemLibraryHandle()90 void DataItemsFactoryProxy::closeDataItemLibraryHandle()
91 {
92 if (NULL != dataItemLibHandle) {
93 dlclose(dataItemLibHandle);
94 dataItemLibHandle = NULL;
95 }
96 }
97
98 } // namespace loc_core
99
100
101