1 /*
2 * Copyright (c) 2020, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation. Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25
26
27 #include <dlfcn.h>
28 #include "Dll.h"
29 #include "FileUtils.h"
30 #include "ErrorHandling.h"
31
32
33 namespace {
34
loadLibrary(const tstring & path)35 HMODULE loadLibrary(const tstring& path) {
36 HMODULE h = dlopen(path.c_str(), RTLD_LAZY);
37 if (!h) {
38 JP_THROW(tstrings::any() << "dlopen(" << path
39 << ") failed. Error: " << dlerror());
40 }
41 return h;
42 }
43
44 } // namesace
45
Dll(const tstrings::any & libPath)46 Dll::Dll(const tstrings::any &libPath): thePath(libPath.tstr()),
47 handle(loadLibrary(thePath)) {
48 }
49
Dll(const Dll & other)50 Dll::Dll(const Dll& other): thePath(other.thePath),
51 handle(loadLibrary(thePath)) {
52 }
53
getFunction(const std::string & name,bool throwIfNotFound) const54 void* Dll::getFunction(const std::string &name, bool throwIfNotFound) const {
55 void *ptr = dlsym(handle.get(), name.c_str());
56 if (throwIfNotFound && !ptr) {
57 JP_THROW(tstrings::any() << "dlsym(" << thePath
58 << ", " << name << ") failed. Error: " << dlerror());
59 }
60 return ptr;
61 }
62
63 /*static*/
freeLibrary(HMODULE h)64 void Dll::freeLibrary(HMODULE h) {
65 if (h) {
66 dlclose(h);
67 }
68 }
69