kc3-lang/angle/src/common/system_utils_posix.cpp

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• Hash : 51937ab3
  Author :
  Date : 2021-06-25T09:10:42
  

  Re-land "Add SearchType to OpenSharedLibraryWithExtension."
  
  This fixes a bug in SystemInfo_vulkan where we were using the
  System search path for the Vulkan loader when we prefer using the
  custom ANGLE loader.
  
  Re-land fixes a bug where we would try to load the custom
  libVulkan on Android and other platforms where we should be using
  the system version.
  
  Bug: chromium:1219969
  Change-Id: I34b592fb87cbddfd02c837a17942cac54c85d9d1
  Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/3007265
  Reviewed-by: Geoff Lang <geofflang@chromium.org>
  Commit-Queue: Jamie Madill <jmadill@chromium.org>
  

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• src/common/system_utils_posix.cpp

• //
  // Copyright 2018 The ANGLE Project Authors. All rights reserved.
  // Use of this source code is governed by a BSD-style license that can be
  // found in the LICENSE file.
  //
  
  // system_utils_posix.cpp: Implementation of POSIX OS-specific functions.
  
  #include "system_utils.h"
  
  #include <array>
  #include <iostream>
  
  #include <dlfcn.h>
  #include <sys/stat.h>
  #include <sys/types.h>
  #include <sys/wait.h>
  #include <unistd.h>
  
  namespace angle
  {
  Optional<std::string> GetCWD()
  {
      std::array<char, 4096> pathBuf;
      char *result = getcwd(pathBuf.data(), pathBuf.size());
      if (result == nullptr)
      {
          return Optional<std::string>::Invalid();
      }
      return std::string(pathBuf.data());
  }
  
  bool SetCWD(const char *dirName)
  {
      return (chdir(dirName) == 0);
  }
  
  bool UnsetEnvironmentVar(const char *variableName)
  {
      return (unsetenv(variableName) == 0);
  }
  
  bool SetEnvironmentVar(const char *variableName, const char *value)
  {
      return (setenv(variableName, value, 1) == 0);
  }
  
  std::string GetEnvironmentVar(const char *variableName)
  {
      const char *value = getenv(variableName);
      return (value == nullptr ? std::string() : std::string(value));
  }
  
  const char *GetPathSeparatorForEnvironmentVar()
  {
      return ":";
  }
  
  std::string GetModuleDirectory()
  {
      std::string directory;
      static int placeholderSymbol = 0;
      Dl_info dlInfo;
      if (dladdr(&placeholderSymbol, &dlInfo) != 0)
      {
          std::string moduleName = dlInfo.dli_fname;
          directory              = moduleName.substr(0, moduleName.find_last_of('/') + 1);
      }
      // Ensure we return the full path to the module, not the relative path
      Optional<std::string> cwd = GetCWD();
      if (cwd.valid() && !IsFullPath(directory))
      {
          directory = ConcatenatePath(cwd.value(), directory);
      }
      return directory;
  }
  
  class PosixLibrary : public Library
  {
    public:
      PosixLibrary(const std::string &fullPath, int extraFlags)
          : mModule(dlopen(fullPath.c_str(), RTLD_NOW | extraFlags))
      {}
  
      ~PosixLibrary() override
      {
          if (mModule)
          {
              dlclose(mModule);
          }
      }
  
      void *getSymbol(const char *symbolName) override
      {
          if (!mModule)
          {
              return nullptr;
          }
  
          return dlsym(mModule, symbolName);
      }
  
      void *getNative() const override { return mModule; }
  
    private:
      void *mModule = nullptr;
  };
  
  Library *OpenSharedLibrary(const char *libraryName, SearchType searchType)
  {
      std::string nameWithExt = std::string(libraryName) + "." + GetSharedLibraryExtension();
      return OpenSharedLibraryWithExtension(nameWithExt.c_str(), searchType);
  }
  
  Library *OpenSharedLibraryWithExtension(const char *libraryName, SearchType searchType)
  {
      std::string directory;
      if (searchType == SearchType::ApplicationDir)
      {
  #if ANGLE_PLATFORM_IOS
          // On iOS, shared libraries must be loaded from within the app bundle.
          directory = GetExecutableDirectory() + "/Frameworks/";
  #else
          directory = GetModuleDirectory();
  #endif
      }
  
      int extraFlags = 0;
      if (searchType == SearchType::AlreadyLoaded)
      {
          extraFlags = RTLD_NOLOAD;
      }
  
      std::string fullPath = directory + libraryName;
  #if ANGLE_PLATFORM_IOS
      // On iOS, dlopen needs a suffix on the framework name to work.
      fullPath = fullPath + "/" + libraryName;
  #endif
      return new PosixLibrary(fullPath, extraFlags);
  }
  
  bool IsDirectory(const char *filename)
  {
      struct stat st;
      int result = stat(filename, &st);
      return result == 0 && ((st.st_mode & S_IFDIR) == S_IFDIR);
  }
  
  bool IsDebuggerAttached()
  {
      // This could have a fuller implementation.
      // See https://cs.chromium.org/chromium/src/base/debug/debugger_posix.cc
      return false;
  }
  
  void BreakDebugger()
  {
      // This could have a fuller implementation.
      // See https://cs.chromium.org/chromium/src/base/debug/debugger_posix.cc
      abort();
  }
  
  const char *GetExecutableExtension()
  {
      return "";
  }
  
  char GetPathSeparator()
  {
      return '/';
  }
  
  std::string GetRootDirectory()
  {
      return "/";
  }
  }  // namespace angle
  

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