ClickHouse/base/poco/Foundation/include/Poco/Environment.h

//
// Environment.h
//
// Library: Foundation
// Package: Core
// Module:  Environment
//
// Definition of the Environment class.
//
// Copyright (c) 2004-2006, Applied Informatics Software Engineering GmbH.
// and Contributors.
//
// SPDX-License-Identifier:	BSL-1.0
//


#ifndef Foundation_Environment_INCLUDED
#define Foundation_Environment_INCLUDED


#include "Poco/Foundation.h"


namespace Poco
{


class Foundation_API Environment
/// This class provides access to environment variables
/// and some general system information.
{
public:
    typedef UInt8 NodeId[6]; /// Ethernet address.

    static std::string get(const std::string & name);
    /// Returns the value of the environment variable
    /// with the given name. Throws a NotFoundException
    /// if the variable does not exist.

    static std::string get(const std::string & name, const std::string & defaultValue);
    /// Returns the value of the environment variable
    /// with the given name. If the environment variable
    /// is undefined, returns defaultValue instead.

    static bool has(const std::string & name);
    /// Returns true iff an environment variable
    /// with the given name is defined.

    static void set(const std::string & name, const std::string & value);
    /// Sets the environment variable with the given name
    /// to the given value.

    static std::string osName();
    /// Returns the operating system name.

    static std::string osDisplayName();
    /// Returns the operating system name in a
    /// "user-friendly" way.
    ///
    /// Currently this is only implemented for
    /// Windows. There it will return names like
    /// "Windows XP" or "Windows 7/Server 2008 SP2".
    /// On other platforms, returns the same as
    /// osName().

    static std::string osVersion();
    /// Returns the operating system version.

    static std::string osArchitecture();
    /// Returns the operating system architecture.

    static std::string nodeName();
    /// Returns the node (or host) name.

    static void nodeId(NodeId & id);
    /// Returns the Ethernet address of the first Ethernet
    /// adapter found on the system.
    ///
    /// Throws a SystemException if no Ethernet adapter is available.

    static std::string nodeId();
    /// Returns the Ethernet address (format "xx:xx:xx:xx:xx:xx")
    /// of the first Ethernet adapter found on the system.
    ///
    /// Throws a SystemException if no Ethernet adapter is available.

    static unsigned processorCount();
    /// Returns the number of processors installed in the system.
    ///
    /// If the number of processors cannot be determined, returns 1.

    static Poco::UInt32 libraryVersion();
    /// Returns the POCO C++ Libraries version as a hexadecimal
    /// number in format 0xAABBCCDD, where
    ///    - AA is the major version number,
    ///    - BB is the minor version number,
    ///    - CC is the revision number, and
    ///    - DD is the patch level number.
    ///
    /// Some patch level ranges have special meanings:
    ///    - Dx mark development releases,
    ///    - Ax mark alpha releases, and
    ///    - Bx mark beta releases.

    static Poco::Int32 os();
    /// Return the operating system as defined
    /// in the include Foundation/Platform.h (POCO_OS)

    static Poco::Int32 arch();
    /// Return the underlying cpu architecture that runs this operating system
    /// as defined in Foundation/Platform (POCO_ARCH)

    static bool isUnix();
    /// Return true if the operating system belongs to the Linux family

    static bool isWindows();
    /// Return true if the operating system belongs to the Windows family
};


} // namespace Poco


#endif // Foundation_Environment_INCLUDED