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annotate Plugins/Engine/SharedLibrary.cpp @ 1236:21d84e3acc0d

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author Sebastien Jodogne <s.jodogne@gmail.com>
date Fri, 05 Dec 2014 14:53:30 +0100
parents 57400f233de8
children 6e7e5ed91c2d
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1 /**
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2 * Orthanc - A Lightweight, RESTful DICOM Store
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3 * Copyright (C) 2012-2014 Medical Physics Department, CHU of Liege,
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4 * Belgium
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5 *
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6 * This program is free software: you can redistribute it and/or
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7 * modify it under the terms of the GNU General Public License as
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8 * published by the Free Software Foundation, either version 3 of the
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9 * License, or (at your option) any later version.
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10 *
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11 * In addition, as a special exception, the copyright holders of this
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12 * program give permission to link the code of its release with the
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13 * OpenSSL project's "OpenSSL" library (or with modified versions of it
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14 * that use the same license as the "OpenSSL" library), and distribute
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15 * the linked executables. You must obey the GNU General Public License
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16 * in all respects for all of the code used other than "OpenSSL". If you
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17 * modify file(s) with this exception, you may extend this exception to
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18 * your version of the file(s), but you are not obligated to do so. If
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19 * you do not wish to do so, delete this exception statement from your
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20 * version. If you delete this exception statement from all source files
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21 * in the program, then also delete it here.
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22 *
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23 * This program is distributed in the hope that it will be useful, but
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24 * WITHOUT ANY WARRANTY; without even the implied warranty of
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25 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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26 * General Public License for more details.
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27 *
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28 * You should have received a copy of the GNU General Public License
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29 * along with this program. If not, see <http://www.gnu.org/licenses/>.
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30 **/
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31
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32
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33 #include "SharedLibrary.h"
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34
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35 #include "../../Core/Toolbox.h"
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36
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37 #if defined(_WIN32)
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38 #include <windows.h>
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39 #elif defined(__linux) || (defined(__APPLE__) && defined(__MACH__)) || defined(__FreeBSD_kernel__)
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40 #include <dlfcn.h>
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41 #else
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42 #error Support your platform here
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43 #endif
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44
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45 #include <glog/logging.h>
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46
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47 namespace Orthanc
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48 {
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49 SharedLibrary::SharedLibrary(const std::string& path) :
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50 path_(path),
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51 handle_(NULL)
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52 {
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53 #if defined(_WIN32)
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54 handle_ = ::LoadLibraryA(path.c_str());
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55 if (handle_ == NULL)
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56 {
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57 LOG(ERROR) << "LoadLibrary(" << path << ") failed: Error " << ::GetLastError();
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58 throw OrthancException(ErrorCode_SharedLibrary);
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59 }
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60
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61 #elif defined(__linux) || (defined(__APPLE__) && defined(__MACH__)) || defined(__FreeBSD_kernel__)
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62 handle_ = ::dlopen(path.c_str(), RTLD_NOW);
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63 if (handle_ == NULL)
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64 {
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65 std::string explanation;
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66 const char *tmp = ::dlerror();
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67 if (tmp)
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68 {
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69 explanation = ": Error " + std::string(tmp);
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70 }
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71
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72 LOG(ERROR) << "dlopen(" << path << ") failed" << explanation;
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73 throw OrthancException(ErrorCode_SharedLibrary);
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74 }
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75
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76 #else
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77 #error Support your platform here
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78 #endif
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79 }
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80
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81 SharedLibrary::~SharedLibrary()
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82 {
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83 if (handle_)
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84 {
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85 #if defined(_WIN32)
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86 ::FreeLibrary((HMODULE)handle_);
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87 #elif defined(__linux) || (defined(__APPLE__) && defined(__MACH__)) || defined(__FreeBSD_kernel__)
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88 ::dlclose(handle_);
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89 #else
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90 #error Support your platform here
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91 #endif
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92 }
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93 }
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94
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95
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96 SharedLibrary::FunctionPointer SharedLibrary::GetFunctionInternal(const std::string& name)
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97 {
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98 if (!handle_)
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99 {
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100 throw OrthancException(ErrorCode_InternalError);
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101 }
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102
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103 #if defined(_WIN32)
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104 return ::GetProcAddress((HMODULE)handle_, name.c_str());
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105 #elif defined(__linux) || (defined(__APPLE__) && defined(__MACH__)) || defined(__FreeBSD_kernel__)
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106 return ::dlsym(handle_, name.c_str());
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107 #else
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108 #error Support your platform here
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109 #endif
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110 }
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111
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112
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113 SharedLibrary::FunctionPointer SharedLibrary::GetFunction(const std::string& name)
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114 {
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115 SharedLibrary::FunctionPointer result = GetFunctionInternal(name);
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116
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117 if (result == NULL)
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118 {
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119 LOG(ERROR) << "Shared library does not expose function \"" << name << "\"";
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120 throw OrthancException(ErrorCode_SharedLibrary);
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121 }
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122 else
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123 {
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124 return result;
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125 }
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126 }
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127
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128
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129 bool SharedLibrary::HasFunction(const std::string& name)
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130 {
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131 return GetFunctionInternal(name) != NULL;
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132 }
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133 }