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annotate Core/SharedLibrary.cpp @ 2837:9451431582e3

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author Sebastien Jodogne <s.jodogne@gmail.com>
date Thu, 20 Sep 2018 16:18:00 +0200
parents be5c0f4155f6
children d924f9bb61cc
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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) 2017-2018 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 General Public License as
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9 * published by the Free Software Foundation, either version 3 of the
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10 * License, or (at your option) any later version.
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11 *
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12 * In addition, as a special exception, the copyright holders of this
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13 * program give permission to link the code of its release with the
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14 * OpenSSL project's "OpenSSL" library (or with modified versions of it
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15 * that use the same license as the "OpenSSL" library), and distribute
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16 * the linked executables. You must obey the GNU General Public License
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17 * in all respects for all of the code used other than "OpenSSL". If you
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18 * modify file(s) with this exception, you may extend this exception to
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19 * your version of the file(s), but you are not obligated to do so. If
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20 * you do not wish to do so, delete this exception statement from your
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21 * version. If you delete this exception statement from all source files
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22 * in the program, then also delete it here.
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23 *
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24 * This program is distributed in the hope that it will be useful, but
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25 * WITHOUT ANY WARRANTY; without even the implied warranty of
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26 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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27 * General Public License for more details.
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28 *
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29 * You should have received a copy of the GNU General Public License
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30 * along with this program. If not, see <http://www.gnu.org/licenses/>.
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31 **/
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32
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33
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34 #include "PrecompiledHeaders.h"
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35 #include "SharedLibrary.h"
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36
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37 #include "Logging.h"
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38 #include "OrthancException.h"
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39
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40 #include <boost/filesystem.hpp>
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41
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42 #if defined(_WIN32)
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43 #include <windows.h>
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44 #elif defined(__linux__) || (defined(__APPLE__) && defined(__MACH__)) || defined(__FreeBSD_kernel__) || defined(__FreeBSD__) || defined(__OpenBSD__)
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45 #include <dlfcn.h>
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46 #else
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47 #error Support your platform here
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48 #endif
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49
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50 namespace Orthanc
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51 {
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52 SharedLibrary::SharedLibrary(const std::string& path) :
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53 path_(path),
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54 handle_(NULL)
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55 {
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56 #if defined(_WIN32)
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57 handle_ = ::LoadLibraryA(path_.c_str());
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58 if (handle_ == NULL)
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59 {
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60 LOG(ERROR) << "LoadLibrary(" << path_ << ") failed: Error " << ::GetLastError();
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61 throw OrthancException(ErrorCode_SharedLibrary);
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62 }
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63
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64 #elif defined(__linux__) || (defined(__APPLE__) && defined(__MACH__)) || defined(__FreeBSD_kernel__) || defined(__FreeBSD__) || defined(__OpenBSD__)
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65 handle_ = ::dlopen(path_.c_str(), RTLD_NOW);
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66 if (handle_ == NULL)
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67 {
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68 std::string explanation;
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69 const char *tmp = ::dlerror();
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70 if (tmp)
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71 {
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72 explanation = ": Error " + std::string(tmp);
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73 }
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74
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75 LOG(ERROR) << "dlopen(" << path_ << ") failed" << explanation;
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76 throw OrthancException(ErrorCode_SharedLibrary);
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77 }
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78
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79 #else
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80 #error Support your platform here
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81 #endif
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82 }
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83
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84 SharedLibrary::~SharedLibrary()
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85 {
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86 if (handle_)
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87 {
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88 #if defined(_WIN32)
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89 ::FreeLibrary((HMODULE)handle_);
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90 #elif defined(__linux__) || (defined(__APPLE__) && defined(__MACH__)) || defined(__FreeBSD_kernel__) || defined(__FreeBSD__) || defined(__OpenBSD__)
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91 ::dlclose(handle_);
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92 #else
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93 #error Support your platform here
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94 #endif
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95 }
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96 }
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97
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98
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99 SharedLibrary::FunctionPointer SharedLibrary::GetFunctionInternal(const std::string& name)
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100 {
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101 if (!handle_)
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102 {
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103 throw OrthancException(ErrorCode_InternalError);
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104 }
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105
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106 #if defined(_WIN32)
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107 return ::GetProcAddress((HMODULE)handle_, name.c_str());
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108 #elif defined(__linux__) || (defined(__APPLE__) && defined(__MACH__)) || defined(__FreeBSD_kernel__) || defined(__FreeBSD__) || defined(__OpenBSD__)
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109 return ::dlsym(handle_, name.c_str());
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110 #else
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111 #error Support your platform here
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112 #endif
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113 }
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114
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115
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116 SharedLibrary::FunctionPointer SharedLibrary::GetFunction(const std::string& name)
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117 {
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118 SharedLibrary::FunctionPointer result = GetFunctionInternal(name);
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119
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120 if (result == NULL)
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121 {
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122 LOG(ERROR) << "Shared library does not expose function \"" << name << "\"";
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123 throw OrthancException(ErrorCode_SharedLibrary);
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124 }
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125 else
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126 {
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127 return result;
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128 }
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129 }
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130
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131
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132 bool SharedLibrary::HasFunction(const std::string& name)
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133 {
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134 return GetFunctionInternal(name) != NULL;
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135 }
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136 }