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//
// 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 SetEnvironmentVar(const char *variableName, const char *value)
{
return (setenv(variableName, value, 1) == 0);
}
} // namespace angle
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