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

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• Hash : 175d918a
  Author :
  Date : 2018-12-16T19:53:23
  

  Revert "Load correct libGLESv2 on Linux and Mac."
  
  This reverts commit dd815b623e60a1e1550f328104ffcd7caf20fde1.
  
  Reason for revert: Broke https://luci-milo.appspot.com/p/chromium/builders/luci.chromium.ci/win-rel/8006
  
  Original change's description:
  > Load correct libGLESv2 on Linux and Mac.
  > 
  > libEGL was implicitly loading libGLESv2 on startup. This is bad
  > because on platforms like Linux and Mac we could sometimes use the
  > incorrect rpath. This in turn meant we needed workarounds like using
  > "_angle" extensions to our shared objects to get the correct loading
  > behaviour.
  > 
  > Fix this by loading libGLESv2 dynamically in libEGL. We build the
  > loader automatically from egl.xml. The loader itself is lazily
  > initialized on every EGL entry point call. This is necessary because
  > on Linux, etc, there is no equivalent to Windows' DLLMain.
  > 
  > We also use an EGL.h with different generation options so we have the
  > proper function pointer types. A README is included for instructions
  > on how to regenerate EGL.h.
  > 
  > The entry point generation script is refactored into a helper class
  > that is used in the loader generator. Also adds the libGLESv2 versions
  > of the EGL entry points in the DEF file on Windows. This allows them to
  > be imported properly in 32-bit configurations.
  > 
  > Also fixes up some errors in ANGLE's entry point definitions. Also
  > includes a clang-format disable rule for the Khronos headers.
  > 
  > This CL will help us to run ANGLE tests against native drivers.
  > 
  > Bug: angleproject:2871
  > Change-Id: Id6ecf969308f17b1be4083538428c9c1a1836572
  > Reviewed-on: https://chromium-review.googlesource.com/c/1370725
  > Commit-Queue: Jamie Madill <jmadill@chromium.org>
  > Reviewed-by: Geoff Lang <geofflang@chromium.org>
  
  TBR=ynovikov@chromium.org,geofflang@chromium.org,jmadill@chromium.org
  
  Change-Id: I921b3c45435ab4f05cbc2d1c1172b4185d6257b0
  No-Presubmit: true
  No-Tree-Checks: true
  No-Try: true
  Bug: angleproject:2871
  Reviewed-on: https://chromium-review.googlesource.com/c/1378887
  Reviewed-by: Yuly Novikov <ynovikov@chromium.org>
  Commit-Queue: Yuly Novikov <ynovikov@chromium.org>
  

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• src/common/system_utils_linux.cpp

• //
  // Copyright (c) 2015 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_linux.cpp: Implementation of OS-specific functions for Linux
  
  #include "system_utils.h"
  
  #include <sys/stat.h>
  #include <sys/time.h>
  #include <sys/types.h>
  #include <unistd.h>
  
  #include <array>
  
  namespace angle
  {
  
  namespace
  {
  
  std::string GetExecutablePathImpl()
  {
      // We cannot use lstat to get the size of /proc/self/exe as it always returns 0
      // so we just use a big buffer and hope the path fits in it.
      char path[4096];
  
      ssize_t result = readlink("/proc/self/exe", path, sizeof(path) - 1);
      if (result < 0 || static_cast<size_t>(result) >= sizeof(path) - 1)
      {
          return "";
      }
  
      path[result] = '\0';
      return path;
  }
  
  std::string GetExecutableDirectoryImpl()
  {
      std::string executablePath = GetExecutablePath();
      size_t lastPathSepLoc      = executablePath.find_last_of("/");
      return (lastPathSepLoc != std::string::npos) ? executablePath.substr(0, lastPathSepLoc) : "";
  }
  
  }  // anonymous namespace
  
  const char *GetExecutablePath()
  {
      // TODO(jmadill): Make global static string thread-safe.
      const static std::string &exePath = GetExecutablePathImpl();
      return exePath.c_str();
  }
  
  const char *GetExecutableDirectory()
  {
      // TODO(jmadill): Make global static string thread-safe.
      const static std::string &exeDir = GetExecutableDirectoryImpl();
      return exeDir.c_str();
  }
  
  const char *GetSharedLibraryExtension()
  {
      return "so";
  }
  
  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 *GetPathSeparator()
  {
      return ":";
  }
  
  }  // namespace angle
  

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