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annotate OrthancFramework/Sources/SharedLibrary.cpp @ 4300:b30a8de92ad9

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abi continued
author Sebastien Jodogne <s.jodogne@gmail.com>
date Thu, 05 Nov 2020 19:33:18 +0100
parents bf7b9edf6b81
children c601f48c7c80
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1 /**
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2 * Orthanc - A Lightweight, RESTful DICOM Store
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3 * Copyright (C) 2012-2016 Sebastien Jodogne, Medical Physics
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4 * Department, University Hospital of Liege, Belgium
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5 * Copyright (C) 2017-2020 Osimis S.A., Belgium
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6 *
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7 * This program is free software: you can redistribute it and/or
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8 * modify it under the terms of the GNU Lesser General Public License
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9 * as published by the Free Software Foundation, either version 3 of
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10 * the License, or (at your option) any later version.
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11 *
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12 * This program is distributed in the hope that it will be useful, but
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13 * WITHOUT ANY WARRANTY; without even the implied warranty of
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14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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15 * Lesser General Public License for more details.
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16 *
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17 * You should have received a copy of the GNU Lesser General Public
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18 * License along with this program. If not, see
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19 * <http://www.gnu.org/licenses/>.
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20 **/
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21
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22
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23 #include "PrecompiledHeaders.h"
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24 #include "SharedLibrary.h"
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25
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26 #include "Logging.h"
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27 #include "OrthancException.h"
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28
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29 #include <boost/filesystem.hpp>
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30
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31 #if defined(_WIN32)
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32 #include <windows.h>
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33 #elif defined(__linux__) || (defined(__APPLE__) && defined(__MACH__)) || defined(__FreeBSD_kernel__) || defined(__FreeBSD__) || defined(__OpenBSD__)
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34 #include <dlfcn.h>
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35 #else
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36 #error Support your platform here
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37 #endif
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38
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39 namespace Orthanc
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40 {
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41 SharedLibrary::SharedLibrary(const std::string& path) :
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42 path_(path),
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43 handle_(NULL)
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44 {
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45 #if defined(_WIN32)
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46 handle_ = ::LoadLibraryA(path_.c_str());
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47 if (handle_ == NULL)
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48 {
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49 LOG(ERROR) << "LoadLibrary(" << path_ << ") failed: Error " << ::GetLastError();
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50 throw OrthancException(ErrorCode_SharedLibrary);
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51 }
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52
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53 #elif defined(__linux__) || (defined(__APPLE__) && defined(__MACH__)) || defined(__FreeBSD_kernel__) || defined(__FreeBSD__) || defined(__OpenBSD__)
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54
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55 /**
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56 * "RTLD_LOCAL" is the default, and is only present to be
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57 * explicit. "RTLD_DEEPBIND" was added in Orthanc 1.6.0, in order
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58 * to avoid crashes while loading plugins from the LSB binaries of
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59 * the Orthanc core.
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60 *
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61 * BUT this had no effect, and this results in a crash if loading
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62 * the Python 2.7 plugin => We disabled it again in Orthanc 1.6.1.
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63 **/
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64
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65 #if 0 // && defined(RTLD_DEEPBIND) // This is a GNU extension
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66 // Disabled in Orthanc 1.6.1
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67 handle_ = ::dlopen(path_.c_str(), RTLD_NOW | RTLD_LOCAL | RTLD_DEEPBIND);
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68 #else
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69 handle_ = ::dlopen(path_.c_str(), RTLD_NOW | RTLD_LOCAL);
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70 #endif
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71
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72 if (handle_ == NULL)
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73 {
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74 std::string explanation;
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75 const char *tmp = ::dlerror();
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76 if (tmp)
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77 {
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78 explanation = ": Error " + std::string(tmp);
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79 }
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80
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81 LOG(ERROR) << "dlopen(" << path_ << ") failed" << explanation;
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82 throw OrthancException(ErrorCode_SharedLibrary);
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83 }
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84
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85 #else
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86 #error Support your platform here
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87 #endif
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88 }
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89
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90 SharedLibrary::~SharedLibrary()
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91 {
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92 if (handle_)
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93 {
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94 #if defined(_WIN32)
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95 ::FreeLibrary((HMODULE)handle_);
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96 #elif defined(__linux__) || (defined(__APPLE__) && defined(__MACH__)) || defined(__FreeBSD_kernel__) || defined(__FreeBSD__) || defined(__OpenBSD__)
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97 ::dlclose(handle_);
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98 #else
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99 #error Support your platform here
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100 #endif
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101 }
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102 }
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103
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104
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105 const std::string &SharedLibrary::GetPath() const
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106 {
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107 return path_;
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108 }
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109
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110
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111 SharedLibrary::FunctionPointer SharedLibrary::GetFunctionInternal(const std::string& name)
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112 {
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113 if (!handle_)
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114 {
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115 throw OrthancException(ErrorCode_InternalError);
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116 }
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117
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118 #if defined(_WIN32)
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119 return ::GetProcAddress((HMODULE)handle_, name.c_str());
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120 #elif defined(__linux__) || (defined(__APPLE__) && defined(__MACH__)) || defined(__FreeBSD_kernel__) || defined(__FreeBSD__) || defined(__OpenBSD__)
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121 return ::dlsym(handle_, name.c_str());
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122 #else
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123 #error Support your platform here
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124 #endif
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125 }
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126
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127
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128 SharedLibrary::FunctionPointer SharedLibrary::GetFunction(const std::string& name)
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129 {
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130 SharedLibrary::FunctionPointer result = GetFunctionInternal(name);
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131
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132 if (result == NULL)
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133 {
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134 throw OrthancException(
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135 ErrorCode_SharedLibrary,
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136 "Shared library does not expose function \"" + name + "\"");
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137 }
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138 else
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139 {
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140 return result;
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141 }
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142 }
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143
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144
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145 bool SharedLibrary::HasFunction(const std::string& name)
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146 {
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147 return GetFunctionInternal(name) != NULL;
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148 }
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149 }