nim-chronos/chronos/osdefs.nim

#
#                Chronos' OS declarations
#
#  (c) Copyright 2022-Present Status Research & Development GmbH
#
#                Licensed under either of
#    Apache License, version 2.0, (LICENSE-APACHEv2)
#                MIT license (LICENSE-MIT)
import oserrno
export oserrno

when defined(windows):
  from std/winlean import Sockaddr_storage, InAddr, In6Addr, Sockaddr_in,
                          Sockaddr_in6, SockLen, SockAddr, AddrInfo,
                          SocketHandle
  export Sockaddr_storage, InAddr, In6Addr, Sockaddr_in, Sockaddr_in6, SockLen,
         SockAddr, AddrInfo, SocketHandle
  # Prerequisites for constants
  template WSAIORW*(x, y): untyped = (IOC_INOUT or x or y)
  template WSAIOW*(x, y): untyped =
    clong(-2147483648) or
    ((clong(sizeof(int32)) and clong(IOCPARM_MASK)) shl 16) or (x shl 8) or y

  type
    HANDLE* = distinct uint
    GUID* {.final, pure.} = object
      D1*: uint32
      D2*: uint16
      D3*: uint16
      D4*: array[0..7, byte]

  const
    WSADESCRIPTION_LEN* = 256
    WSASYS_STATUS_LEN* = 128
    MAX_ADAPTER_DESCRIPTION_LENGTH* = 128
    MAX_ADAPTER_NAME_LENGTH* = 256
    MAX_ADAPTER_ADDRESS_LENGTH* = 8

    SOCK_STREAM* = 1
    SOCK_DGRAM* = 2
    SOCK_RAW* = 3

    AF_UNSPEC* = 0
    AF_UNIX* = 1
    AF_INET* = 2
    AF_INET6* = 23
    AF_BTH* = 32
    AF_MAX* = 33

    IPPROTO_IP* = 0
    IPPROTO_ICMP* = 1
    IPPROTO_IPV4* = 4
    IPPROTO_UDP* = 17
    IPPROTO_IPV6* = 41
    IPPROTO_ICMPV6* = 58
    IPPROTO_RAW* = 255
    IPPROTO_MAX* = 256

    INADDR_ANY* = 0x0000_0000'u32
    INADDR_LOOPBACK* = 0x7f00_0001'u32
    INADDR_BROADCAST* = 0xffff_ffff'u32
    INADDR_NONE* = 0xffff_ffff'u32

    CTRL_C_EVENT* = 0'u32
    CTRL_BREAK_EVENT* = 1'u32
    CTRL_CLOSE_EVENT* = 2'u32
    CTRL_LOGOFF_EVENT* = 5'u32
    CTRL_SHUTDOWN_EVENT* = 6'u32

    WAIT_ABANDONED* = 0x80'u32
    WAIT_OBJECT_0* = 0x00'u32
    WAIT_TIMEOUT* = 0x102'u32
    WAIT_FAILED* = 0xFFFF_FFFF'u32
    TRUE* = 1'u32
    FALSE* = 0'u32
    INFINITE* = 0xFFFF_FFFF'u32

    WT_EXECUTEDEFAULT* = 0x00000000'u32
    WT_EXECUTEINIOTHREAD* = 0x00000001'u32
    WT_EXECUTEINUITHREAD* = 0x00000002'u32
    WT_EXECUTEINWAITTHREAD* = 0x00000004'u32
    WT_EXECUTEONLYONCE* = 0x00000008'u32
    WT_EXECUTELONGFUNCTION* = 0x00000010'u32
    WT_EXECUTEINTIMERTHREAD* = 0x00000020'u32
    WT_EXECUTEINPERSISTENTIOTHREAD* = 0x00000040'u32
    WT_EXECUTEINPERSISTENTTHREAD* = 0x00000080'u32
    WT_TRANSFER_IMPERSONATION* = 0x00000100'u32

    GENERIC_READ* = 0x80000000'u32
    GENERIC_WRITE* = 0x40000000'u32
    GENERIC_ALL* = 0x10000000'u32
    FILE_SHARE_READ* = 1'u32
    FILE_SHARE_DELETE* = 4'u32
    FILE_SHARE_WRITE* = 2'u32

    OPEN_EXISTING* = 3'u32

    FILE_READ_DATA* = 0x00000001'u32
    FILE_WRITE_DATA* = 0x00000002'u32

    IPPROTO_TCP* = 6
    PIPE_TYPE_BYTE* = 0x00000000'u32
    PIPE_READMODE_BYTE* = 0x00000000'u32
    PIPE_WAIT* = 0x00000000'u32
    PIPE_TYPE_MESSAGE* = 0x4'u32
    PIPE_READMODE_MESSAGE* = 0x2'u32
    PIPE_UNLIMITED_INSTANCES* = 255'u32
    DEFAULT_PIPE_SIZE* = 65536'u32

    STATUS_PENDING* = 0x103

    IOCPARM_MASK* = 0x7f'u32
    IOC_OUT* = 0x40000000'u32
    IOC_IN*  = 0x80000000'u32
    IOC_WS2* = 0x08000000'u32
    IOC_INOUT* = IOC_IN or IOC_OUT

    INVALID_SOCKET* = SocketHandle(-1)
    INVALID_HANDLE_VALUE* = HANDLE(uint(not(0'u)))

    SIO_GET_EXTENSION_FUNCTION_POINTER* = uint32(WSAIORW(IOC_WS2, 6))
    SO_UPDATE_ACCEPT_CONTEXT* = 0x700B
    SO_CONNECT_TIME* = 0x700C
    SO_UPDATE_CONNECT_CONTEXT* = 0x7010

    FILE_FLAG_FIRST_PIPE_INSTANCE* = 0x00080000'u32
    FILE_FLAG_OPEN_NO_RECALL* = 0x00100000'u32
    FILE_FLAG_OPEN_REPARSE_POINT* = 0x00200000'u32
    FILE_FLAG_POSIX_SEMANTICS* = 0x01000000'u32
    FILE_FLAG_BACKUP_SEMANTICS* = 0x02000000'u32
    FILE_FLAG_DELETE_ON_CLOSE* = 0x04000000'u32
    FILE_FLAG_SEQUENTIAL_SCAN* = 0x08000000'u32
    FILE_FLAG_RANDOM_ACCESS* = 0x10000000'u32
    FILE_FLAG_NO_BUFFERING* = 0x20000000'u32
    FILE_FLAG_OVERLAPPED* = 0x40000000'u32
    FILE_FLAG_WRITE_THROUGH* = 0x80000000'u32

    PIPE_ACCESS_DUPLEX* = 0x00000003'u32
    PIPE_ACCESS_INBOUND* = 1'u32
    PIPE_ACCESS_OUTBOUND* = 2'u32
    PIPE_NOWAIT* = 0x00000001'u32

    IOC_VENDOR* = 0x18000000'u32
    SIO_UDP_CONNRESET* = IOC_IN or IOC_VENDOR or 12'u32
    IP_TTL* = 4
    SOMAXCONN* = 2147483647
    SOL_SOCKET* = 0xFFFF

    SO_DEBUG* = 0x0001
    SO_ACCEPTCONN* = 0x0002
    SO_REUSEADDR* = 0x0004
    SO_REUSEPORT* = SO_REUSEADDR
    SO_KEEPALIVE* = 0x0008
    SO_DONTROUTE* = 0x0010
    SO_BROADCAST* = 0x0020
    SO_USELOOPBACK* = 0x0040
    SO_LINGER* = 0x0080
    SO_OOBINLINE* = 0x0100
    SO_DONTLINGER* = not(SO_LINGER)
    SO_EXCLUSIVEADDRUSE* = not(SO_REUSEADDR)
    SO_SNDBUF* = 0x1001
    SO_RCVBUF* = 0x1002
    SO_SNDLOWAT* = 0x1003
    SO_RCVLOWAT* = 0x1004
    SO_SNDTIMEO* = 0x1005
    SO_RCVTIMEO* = 0x1006
    SO_ERROR* = 0x1007
    SO_TYPE* = 0x1008
    TCP_NODELAY* = 1

    STD_INPUT_HANDLE* = 0xFFFF_FFF6'u32
    STD_OUTPUT_HANDLE* = 0xFFFF_FFF5'u32
    STD_ERROR_HANDLE* = 0xFFFF_FFF4'u32

    STARTF_USESHOWWINDOW* = 0x00000001'u32
    STARTF_USESIZE* = 0x00000002'u32
    STARTF_USEPOSITION* = 0x00000004'u32
    STARTF_USECOUNTCHARS* = 0x00000008'u32
    STARTF_USEFILLATTRIBUTE* = 0x00000010'u32
    STARTF_RUNFULLSCREEN* = 0x00000020'u32
    STARTF_FORCEONFEEDBACK* = 0x00000040'u32
    STARTF_FORCEOFFFEEDBACK* = 0x00000080'u32
    STARTF_USESTDHANDLES* = 0x00000100'u32
    STARTF_USEHOTKEY* = 0x00000200'u32
    STARTF_TITLEISLINKNAME* = 0x00000800'u32
    STARTF_TITLEISAPPID* = 0x00001000'u32
    STARTF_PREVENTPINNING* = 0x00002000'u32
    STARTF_UNTRUSTEDSOURCE* = 0x00008000'u32

    DEBUG_PROCESS* = 0x1'u32
    DEBUG_ONLY_THIS_PROCESS* = 0x2'u32
    CREATE_SUSPENDED* = 0x4'u32
    DETACHED_PROCESS* = 0x8'u32
    CREATE_NEW_CONSOLE* = 0x10'u32
    NORMAL_PRIORITY_CLASS* = 0x20'u32
    IDLE_PRIORITY_CLASS* = 0x40'u32
    HIGH_PRIORITY_CLASS* = 0x80'u32
    REALTIME_PRIORITY_CLASS* = 0x100'u32
    CREATE_NEW_PROCESS_GROUP* = 0x200'u32
    CREATE_UNICODE_ENVIRONMENT* = 0x400'u32
    CREATE_SEPARATE_WOW_VDM* = 0x800'u32
    CREATE_SHARED_WOW_VDM* = 0x1000'u32
    CREATE_FORCEDOS* = 0x2000'u32
    BELOW_NORMAL_PRIORITY_CLASS* = 0x4000'u32
    ABOVE_NORMAL_PRIORITY_CLASS* = 0x8000'u32
    INHERIT_PARENT_AFFINITY* = 0x10000'u32
    INHERIT_CALLER_PRIORITY* = 0x20000'u32
    CREATE_PROTECTED_PROCESS* = 0x40000'u32
    EXTENDED_STARTUPINFO_PRESENT* = 0x80000'u32
    PROCESS_MODE_BACKGROUND_BEGIN* = 0x100000'u32
    PROCESS_MODE_BACKGROUND_END* = 0x200000'u32
    CREATE_SECURE_PROCESS* = 0x400000'u32
    CREATE_BREAKAWAY_FROM_JOB* = 0x1000000'u32
    CREATE_PRESERVE_CODE_AUTHZ_LEVEL* = 0x2000000'u32
    CREATE_DEFAULT_ERROR_MODE* = 0x4000000'u32
    CREATE_NO_WINDOW* = 0x8000000'u32
    PROFILE_USER* = 0x10000000'u32
    PROFILE_KERNEL* = 0x20000000'u32
    PROFILE_SERVER* = 0x40000000'u32
    CREATE_IGNORE_SYSTEM_DEFAULT* = 0x80000000'u32

    STILL_ACTIVE* = 0x00000103'u32

    WSAID_CONNECTEX* =
      GUID(D1: 0x25a207b9'u32, D2: 0xddf3'u16, D3: 0x4660'u16,
           D4: [0x8e'u8, 0xe9'u8, 0x76'u8, 0xe5'u8,
                0x8c'u8, 0x74'u8, 0x06'u8, 0x3e'u8])
    WSAID_ACCEPTEX* =
      GUID(D1: 0xb5367df1'u32, D2: 0xcbac'u16, D3: 0x11cf'u16,
           D4: [0x95'u8, 0xca'u8, 0x00'u8, 0x80'u8,
                0x5f'u8, 0x48'u8, 0xa1'u8, 0x92'u8])
    WSAID_GETACCEPTEXSOCKADDRS* =
      GUID(D1: 0xb5367df2'u32, D2: 0xcbac'u16, D3: 0x11cf'u16,
           D4: [0x95'u8, 0xca'u8, 0x00'u8, 0x80'u8,
                0x5f'u8, 0x48'u8, 0xa1'u8, 0x92'u8])
    WSAID_TRANSMITFILE* =
      GUID(D1: 0xb5367df0'u32, D2: 0xcbac'u16, D3: 0x11cf'u16,
           D4: [0x95'u8, 0xca'u8, 0x00'u8, 0x80'u8,
                0x5f'u8, 0x48'u8, 0xa1'u8, 0x92'u8])

    GAA_FLAG_INCLUDE_PREFIX* = 0x0010'u32

    DELETE* = 0x00010000'u32
    READ_CONTROL* = 0x00020000'u32
    WRITE_DAC* = 0x00040000'u32
    WRITE_OWNER* = 0x00080000'u32
    SYNCHRONIZE* = 0x00100000'u32

    CP_UTF8* = 65001'u32

    WSA_FLAG_OVERLAPPED* = 0x01'u32
    WSA_FLAG_NO_HANDLE_INHERIT* = 0x80'u32

    FIONBIO* = WSAIOW(102, 126)

    HANDLE_FLAG_INHERIT* = 1'u32

  type
    LONG* = int32
    ULONG* = uint32
    PULONG* = ptr uint32
    WINBOOL* = uint32
    DWORD* = uint32
    WORD* = uint16
    UINT* = uint32
    PDWORD* = ptr DWORD
    LPINT* = ptr int32
    LPSTR* = cstring
    ULONG_PTR* = uint
    PULONG_PTR* = ptr uint
    WCHAR* = distinct uint16
    LPWSTR* = ptr WCHAR
    GROUP* = uint32

    WSAData* {.final, pure.} = object
      wVersion*, wHighVersion*: WORD
      when sizeof(int) == 8:
        iMaxSockets*, iMaxUdpDg*: WORD
        lpVendorInfo*: cstring
        szDescription*: array[WSADESCRIPTION_LEN + 1, char]
        szSystemStatus*: array[WSASYS_STATUS_LEN + 1, char]
      else:
        szDescription*: array[WSADESCRIPTION_LEN + 1, char]
        szSystemStatus*: array[WSASYS_STATUS_LEN + 1, char]
        iMaxSockets*, iMaxUdpDg*: WORD
        lpVendorInfo*: cstring

    SECURITY_ATTRIBUTES* {.final, pure.} = object
      nLength*: DWORD
      lpSecurityDescriptor*: pointer
      bInheritHandle*: WINBOOL

    OVERLAPPED* {.pure, inheritable.} = object
      internal*: PULONG
      internalHigh*: PULONG
      offset*: DWORD
      offsetHigh*: DWORD
      hEvent*: HANDLE

    WSABUF* {.final, pure.} = object
      len*: ULONG
      buf*: cstring

    POVERLAPPED* = ptr OVERLAPPED

    POVERLAPPED_COMPLETION_ROUTINE* = proc (para1: DWORD, para2: DWORD,
                                            para3: POVERLAPPED) {.
      stdcall, gcsafe, raises: [].}

    PHANDLER_ROUTINE* = proc (dwCtrlType: DWORD): WINBOOL {.
      stdcall, gcsafe, raises: [].}

    OSVERSIONINFO* {.final, pure.} = object
      dwOSVersionInfoSize*: DWORD
      dwMajorVersion*: DWORD
      dwMinorVersion*: DWORD
      dwBuildNumber*: DWORD
      dwPlatformId*: DWORD
      szCSDVersion*: array[0..127, WORD]

    STARTUPINFO* {.final, pure.} = object
      cb*: DWORD
      lpReserved*: LPSTR
      lpDesktop*: LPSTR
      lpTitle*: LPSTR
      dwX*: DWORD
      dwY*: DWORD
      dwXSize*: DWORD
      dwYSize*: DWORD
      dwXCountChars*: DWORD
      dwYCountChars*: DWORD
      dwFillAttribute*: DWORD
      dwFlags*: DWORD
      wShowWindow*: WORD
      cbReserved2*: WORD
      lpReserved2*: pointer
      hStdInput*: HANDLE
      hStdOutput*: HANDLE
      hStdError*: HANDLE

    PROCESS_INFORMATION* {.final, pure.} = object
      hProcess*: HANDLE
      hThread*: HANDLE
      dwProcessId*: DWORD
      dwThreadId*: DWORD

    FILETIME* {.final, pure.} = object
      dwLowDateTime*: DWORD
      dwHighDateTime*: DWORD

    SocketAddress* {.final, pure.} = object
      lpSockaddr*: ptr SockAddr
      iSockaddrLength*: cint

    IpAdapterUnicastAddressXpLh* {.final, pure.} = object
      length*: uint32
      flags*: uint32
      next*: ptr IpAdapterUnicastAddressXpLh
      address*: SocketAddress
      prefixOrigin*: cint
      suffixOrigin*: cint
      dadState*: cint
      validLifetime*: uint32
      preferredLifetime*: uint32
      leaseLifetime*: uint32
      onLinkPrefixLength*: byte # This field is available only from Vista

    IpAdapterAnycastAddressXp* {.final, pure.} = object
      length*: uint32
      flags*: uint32
      next*: ptr IpAdapterAnycastAddressXp
      address*: SocketAddress

    IpAdapterMulticastAddressXp* {.final, pure.} = object
      length*: uint32
      flags*: uint32
      next*: ptr IpAdapterMulticastAddressXp
      address*: SocketAddress

    IpAdapterDnsServerAddressXp* {.final, pure.} = object
      length*: uint32
      flags*: uint32
      next*: ptr IpAdapterDnsServerAddressXp
      address*: SocketAddress

    IpAdapterPrefixXp* {.final, pure.} = object
      length*: uint32
      flags*: uint32
      next*: ptr IpAdapterPrefixXp
      address*: SocketAddress
      prefixLength*: uint32

    IpAdapterAddressesXp* {.final, pure.} = object
      length*: uint32
      ifIndex*: uint32
      next*: ptr IpAdapterAddressesXp
      adapterName*: cstring
      unicastAddress*: ptr IpAdapterUnicastAddressXpLh
      anycastAddress*: ptr IpAdapterAnycastAddressXp
      multicastAddress*: ptr IpAdapterMulticastAddressXp
      dnsServerAddress*: ptr IpAdapterDnsServerAddressXp
      dnsSuffix*: ptr WCHAR
      description*: ptr WCHAR
      friendlyName*: ptr WCHAR
      physicalAddress*: array[MAX_ADAPTER_ADDRESS_LENGTH, byte]
      physicalAddressLength*: uint32
      flags*: uint32
      mtu*: uint32
      ifType*: uint32
      operStatus*: cint
      ipv6IfIndex*: uint32
      zoneIndices*: array[16, uint32]
      firstPrefix*: ptr IpAdapterPrefixXp

    MibIpForwardRow* {.final, pure.} = object
      dwForwardDest*: uint32
      dwForwardMask*: uint32
      dwForwardPolicy*: uint32
      dwForwardNextHop*: uint32
      dwForwardIfIndex*: uint32
      dwForwardType*: uint32
      dwForwardProto*: uint32
      dwForwardAge*: uint32
      dwForwardNextHopAS*: uint32
      dwForwardMetric1*: uint32
      dwForwardMetric2*: uint32
      dwForwardMetric3*: uint32
      dwForwardMetric4*: uint32
      dwForwardMetric5*: uint32

    SOCKADDR_INET* {.union.} = object
      ipv4*: Sockaddr_in
      ipv6*: Sockaddr_in6
      si_family*: uint16

    IPADDRESS_PREFIX* {.final, pure.} = object
      prefix*: SOCKADDR_INET
      prefixLength*: uint8

    MibIpForwardRow2* {.final, pure.} = object
      interfaceLuid*: uint64
      interfaceIndex*: uint32
      destinationPrefix*: IPADDRESS_PREFIX
      nextHop*: SOCKADDR_INET
      sitePrefixLength*: byte
      validLifetime*: uint32
      preferredLifetime*: uint32
      metric*: uint32
      protocol*: uint32
      loopback*: bool
      autoconfigureAddress*: bool
      publish*: bool
      immortal*: bool
      age*: uint32
      origin*: uint32

    OVERLAPPED_ENTRY* = object
      lpCompletionKey*: ULONG_PTR
      lpOverlapped*: ptr OVERLAPPED
      internal*: ULONG_PTR
      dwNumberOfBytesTransferred*: DWORD

    GETBESTROUTE2* = proc (
      interfaceLuid: ptr uint64, interfaceIndex: uint32,
      sourceAddress: ptr SOCKADDR_INET, destinationAddress: ptr SOCKADDR_INET,
      addressSortOptions: uint32, bestRoute: ptr MibIpForwardRow2,
      bestSourceAddress: ptr SOCKADDR_INET): DWORD {.
      gcsafe, stdcall, raises: [].}

    WAITORTIMERCALLBACK* = proc (
      p1: pointer, p2: DWORD): void {.
      gcsafe, stdcall, raises: [].}

    WSAPROC_ACCEPTEX* = proc (
      sListenSocket: SocketHandle, sAcceptSocket: SocketHandle,
      lpOutputBuffer: pointer, dwReceiveDataLength: DWORD,
      dwLocalAddressLength: DWORD, dwRemoteAddressLength: DWORD,
      lpdwBytesReceived: ptr DWORD, lpOverlapped: POVERLAPPED): WINBOOL {.
      stdcall, gcsafe, raises: [].}

    WSAPROC_CONNECTEX* = proc (
      s: SocketHandle, name: ptr SockAddr, namelen: cint, lpSendBuffer: pointer,
      dwSendDataLength: DWORD, lpdwBytesSent: ptr DWORD,
      lpOverlapped: POVERLAPPED): WINBOOL {.
      stdcall, gcsafe, raises: [].}

    WSAPROC_GETACCEPTEXSOCKADDRS* = proc (
      lpOutputBuffer: pointer, dwReceiveDataLength: DWORD,
      dwLocalAddressLength: DWORD, dwRemoteAddressLength: DWORD,
      localSockaddr: ptr ptr SockAddr, localSockaddrLength: LPINT,
      remoteSockaddr: ptr ptr SockAddr, remoteSockaddrLength: LPINT) {.
      stdcall, gcsafe, raises: [].}

    WSAPROC_TRANSMITFILE* = proc (
      hSocket: SocketHandle, hFile: HANDLE, nNumberOfBytesToWrite: DWORD,
      nNumberOfBytesPerSend: DWORD, lpOverlapped: POVERLAPPED,
      lpTransmitBuffers: pointer, dwReserved: DWORD): WINBOOL {.
      stdcall, gcsafe, raises: [].}

    LPFN_GETQUEUEDCOMPLETIONSTATUSEX* = proc (
      completionPort: HANDLE, lpPortEntries: ptr OVERLAPPED_ENTRY,
      ulCount: ULONG, ulEntriesRemoved: var ULONG,
      dwMilliseconds: DWORD, fAlertable: WINBOOL): WINBOOL {.
      stdcall, gcsafe, raises: [].}

    WindowsSigHandler = proc (a: cint) {.noconv, raises: [], gcsafe.}

  proc getVersionEx*(lpVersionInfo: ptr OSVERSIONINFO): WINBOOL {.
       stdcall, dynlib: "kernel32", importc: "GetVersionExW", sideEffect.}

  proc createProcess*(lpApplicationName, lpCommandLine: LPWSTR,
                      lpProcessAttributes: ptr SECURITY_ATTRIBUTES,
                      lpThreadAttributes: ptr SECURITY_ATTRIBUTES,
                      bInheritHandles: WINBOOL, dwCreationFlags: DWORD,
                      lpEnvironment, lpCurrentDirectory: LPWSTR,
                      lpStartupInfo: var STARTUPINFO,
                      lpProcessInformation: var PROCESS_INFORMATION): WINBOOL {.
       stdcall, dynlib: "kernel32", importc: "CreateProcessW", sideEffect.}

  proc terminateProcess*(hProcess: HANDLE, uExitCode: UINT): WINBOOL {.
       stdcall, dynlib: "kernel32", importc: "TerminateProcess", sideEffect.}

  proc getExitCodeProcess*(hProcess: HANDLE, lpExitCode: var DWORD): WINBOOL {.
       stdcall, dynlib: "kernel32", importc: "GetExitCodeProcess", sideEffect.}

  proc getStdHandle*(nStdHandle: DWORD): HANDLE {.
       stdcall, dynlib: "kernel32", importc: "GetStdHandle", sideEffect.}

  proc setStdHandle*(nStdHandle: DWORD, hHandle: HANDLE): WINBOOL {.
       stdcall, dynlib: "kernel32", importc: "SetStdHandle", sideEffect.}

  proc suspendThread*(hThread: HANDLE): DWORD {.
      stdcall, dynlib: "kernel32", importc: "SuspendThread", sideEffect.}

  proc resumeThread*(hThread: HANDLE): DWORD {.
       stdcall, dynlib: "kernel32", importc: "ResumeThread", sideEffect.}

  proc closeHandle*(hObject: HANDLE): WINBOOL {.
       stdcall, dynlib: "kernel32", importc: "CloseHandle", sideEffect.}

  proc flushFileBuffers*(hFile: HANDLE): WINBOOL {.
       stdcall, dynlib: "kernel32", importc: "FlushFileBuffers", sideEffect.}

  proc getCurrentDirectory*(nBufferLength: DWORD,
                            lpBuffer: LPWSTR): DWORD {.
       stdcall, dynlib: "kernel32", importc: "GetCurrentDirectoryW",
       sideEffect.}

  proc setCurrentDirectory*(lpPathName: LPWSTR): DWORD {.
       stdcall, dynlib: "kernel32", importc: "SetCurrentDirectoryW",
       sideEffect.}

  proc setEnvironmentVariable*(lpName, lpValue: LPWSTR): DWORD {.
       stdcall, dynlib: "kernel32", importc: "SetEnvironmentVariableW",
       sideEffect.}

  proc getModuleFileName*(handle: HANDLE, buf: LPWSTR,
                          size: DWORD): DWORD {.
       stdcall, dynlib: "kernel32", importc: "GetModuleFileNameW", sideEffect.}

  proc postQueuedCompletionStatus*(completionPort: HANDLE,
                                   dwNumberOfBytesTransferred: DWORD,
                                   dwCompletionKey: ULONG_PTR,
                                   lpOverlapped: pointer): WINBOOL {.
       stdcall, dynlib: "kernel32", importc: "PostQueuedCompletionStatus",
       sideEffect.}

  proc registerWaitForSingleObject*(phNewWaitObject: ptr HANDLE,
                                    hObject: HANDLE,
                                    callback: WAITORTIMERCALLBACK,
                                    context: pointer,
                                    dwMilliseconds: ULONG,
                                    dwFlags: ULONG): WINBOOL {.
       stdcall, dynlib: "kernel32", importc: "RegisterWaitForSingleObject",
       sideEffect.}

  proc waitForSingleObject*(hHandle: HANDLE, dwMilliseconds: DWORD): DWORD {.
       stdcall, dynlib: "kernel32", importc: "WaitForSingleObject",
       sideEffect.}

  proc unregisterWait*(waitHandle: HANDLE): DWORD {.
       stdcall, dynlib: "kernel32", importc: "UnregisterWait", sideEffect.}

  proc openProcess*(dwDesiredAccess: DWORD, bInheritHandle: WINBOOL,
                    dwProcessId: DWORD): HANDLE {.
       stdcall, dynlib: "kernel32", importc: "OpenProcess", sideEffect.}

  proc duplicateHandle*(hSourceProcessHandle: HANDLE, hSourceHandle: HANDLE,
                        hTargetProcessHandle: HANDLE,
                        lpTargetHandle: ptr HANDLE,
                        dwDesiredAccess: DWORD, bInheritHandle: WINBOOL,
                        dwOptions: DWORD): WINBOOL {.
       stdcall, dynlib: "kernel32", importc: "DuplicateHandle", sideEffect.}

  proc setHandleInformation*(hObject: HANDLE, dwMask: DWORD,
                             dwFlags: DWORD): WINBOOL {.
       stdcall, dynlib: "kernel32", importc: "SetHandleInformation",
       sideEffect.}

  proc getHandleInformation*(hObject: HANDLE, lpdwFlags: var DWORD): WINBOOL {.
       stdcall, dynlib: "kernel32", importc: "GetHandleInformation",
       sideEffect.}

  proc getCurrentProcess*(): HANDLE {.
       stdcall, dynlib: "kernel32", importc: "GetCurrentProcess", sideEffect.}

  proc getCurrentProcessId*(): DWORD {.
       stdcall, dynlib: "kernel32", importc: "GetCurrentProcessId", sideEffect.}

  proc getSystemTimeAsFileTime*(lpSystemTimeAsFileTime: var FILETIME) {.
       stdcall, dynlib: "kernel32", importc: "GetSystemTimeAsFileTime",
       sideEffect.}

  proc wsaIoctl*(s: SocketHandle, dwIoControlCode: DWORD, lpvInBuffer: pointer,
                 cbInBuffer: DWORD, lpvOutBuffer: pointer, cbOutBuffer: DWORD,
                 lpcbBytesReturned: PDWORD, lpOverlapped: POVERLAPPED,
                 lpCompletionRoutine: POVERLAPPED_COMPLETION_ROUTINE): cint {.
       stdcall, dynlib: "ws2_32", importc: "WSAIoctl", sideEffect.}

  proc wsaStartup*(wVersionRequired: WORD, WSData: ptr WSAData): cint {.
       stdcall, dynlib: "ws2_32", importc: "WSAStartup", sideEffect.}

  proc wsaRecv*(s: SocketHandle, buf: ptr WSABUF, bufCount: DWORD,
                bytesReceived, flags: PDWORD, lpOverlapped: POVERLAPPED,
                completionProc: POVERLAPPED_COMPLETION_ROUTINE): cint {.
       stdcall, dynlib: "ws2_32", importc: "WSARecv", sideEffect.}

  proc wsaRecvFrom*(s: SocketHandle, buf: ptr WSABUF, bufCount: DWORD,
                    bytesReceived: PDWORD, flags: PDWORD, name: ptr SockAddr,
                    namelen: ptr cint, lpOverlapped: POVERLAPPED,
                    completionProc: POVERLAPPED_COMPLETION_ROUTINE): cint {.
       stdcall, dynlib: "ws2_32", importc: "WSARecvFrom", sideEffect.}

  proc wsaSend*(s: SocketHandle, buf: ptr WSABUF, bufCount: DWORD,
                bytesSent: PDWORD, flags: DWORD, lpOverlapped: POVERLAPPED,
                completionProc: POVERLAPPED_COMPLETION_ROUTINE): cint {.
       stdcall, dynlib: "ws2_32", importc: "WSASend", sideEffect.}

  proc wsaSendTo*(s: SocketHandle, buf: ptr WSABUF, bufCount: DWORD,
                  bytesSent: PDWORD, flags: DWORD, name: ptr SockAddr,
                  namelen: cint, lpOverlapped: POVERLAPPED,
                  completionProc: POVERLAPPED_COMPLETION_ROUTINE): cint {.
       stdcall, dynlib: "ws2_32", importc: "WSASendTo", sideEffect.}

  proc wsaGetLastError*(): cint {.
       stdcall, dynlib: "ws2_32", importc: "WSAGetLastError", sideEffect.}

  proc wsaSocket*(af: cint, stype: cint, protocol: cint,
                  lpProtocolInfo: pointer, g: GROUP,
                  dwFlags: DWORD): SocketHandle {.
       stdcall, dynlib: "ws2_32", importc: "WSASocketW", sideEffect.}

  proc socket*(af, typ, protocol: cint): SocketHandle {.
       stdcall, dynlib: "ws2_32", importc: "socket", sideEffect.}

  proc closesocket*(s: SocketHandle): cint {.
       stdcall, dynlib: "ws2_32", importc: "closesocket", sideEffect.}

  proc shutdown*(s: SocketHandle, how: cint): cint {.
       stdcall, dynlib: "ws2_32", importc: "shutdown", sideEffect.}

  proc getsockopt*(s: SocketHandle, level, optname: cint, optval: pointer,
                   optlen: ptr SockLen): cint {.
       stdcall, dynlib: "ws2_32", importc: "getsockopt", sideEffect.}

  proc setsockopt*(s: SocketHandle, level, optname: cint, optval: pointer,
                   optlen: SockLen): cint {.
       stdcall, dynlib: "ws2_32", importc: "setsockopt", sideEffect.}

  proc getsockname*(s: SocketHandle, name: ptr SockAddr,
                    namelen: ptr SockLen): cint {.
       stdcall, dynlib: "ws2_32", importc: "getsockname", sideEffect.}

  proc getpeername*(s: SocketHandle, name: ptr SockAddr,
                    namelen: ptr SockLen): cint {.
       stdcall, dynlib: "ws2_32", importc: "getpeername", sideEffect.}

  proc ioctlsocket*(s: SocketHandle, cmd: clong, argp: ptr clong): cint {.
       stdcall, dynlib: "ws2_32", importc: "ioctlsocket", sideEffect.}

  proc listen*(s: SocketHandle, backlog: cint): cint {.
       stdcall, dynlib: "ws2_32", importc: "listen", sideEffect.}

  proc connect*(s: SocketHandle, name: ptr SockAddr, namelen: SockLen): cint {.
       stdcall, dynlib: "ws2_32", importc: "connect", sideEffect.}

  proc accept*(s: SocketHandle, a: ptr SockAddr,
               addrlen: ptr SockLen): SocketHandle {.
       stdcall, dynlib: "ws2_32", importc: "accept", sideEffect.}

  proc bindSocket*(s: SocketHandle, name: ptr SockAddr,
                   namelen: SockLen): cint {.
       stdcall, dynlib: "ws2_32", importc: "bind", sideEffect.}

  proc send*(s: SocketHandle, buf: pointer, len, flags: cint): cint {.
       stdcall, dynlib: "ws2_32", importc: "send", sideEffect.}

  proc getaddrinfo*(nodename, servname: cstring, hints: ptr AddrInfo,
                    res: var ptr AddrInfo): cint {.
       stdcall, dynlib: "ws2_32", importc: "getaddrinfo", sideEffect.}

  proc freeaddrinfo*(ai: ptr AddrInfo) {.
       stdcall, dynlib: "ws2_32", importc: "freeaddrinfo", sideEffect.}

  proc createIoCompletionPort*(fileHandle: HANDLE,
                               existingCompletionPort: HANDLE,
                               completionKey: ULONG_PTR,
                               numberOfConcurrentThreads: DWORD): HANDLE {.
       stdcall, dynlib: "kernel32", importc: "CreateIoCompletionPort",
       sideEffect.}

  proc getQueuedCompletionStatus*(completionPort: HANDLE,
                                  lpNumberOfBytesTransferred: PDWORD,
                                  lpCompletionKey: PULONG_PTR,
                                  lpOverlapped: ptr POVERLAPPED,
                                  dwMilliseconds: DWORD): WINBOOL {.
       stdcall, dynlib: "kernel32", importc: "GetQueuedCompletionStatus",
       sideEffect.}

  proc getOverlappedResult*(hFile: HANDLE, lpOverlapped: POVERLAPPED,
                            lpNumberOfBytesTransferred: var DWORD,
                            bWait: WINBOOL): WINBOOL {.
       stdcall, dynlib: "kernel32", importc: "GetOverlappedResult", sideEffect.}

  proc createEvent*(lpEventAttributes: ptr SECURITY_ATTRIBUTES,
                    bManualReset: DWORD, bInitialState: DWORD,
                    lpName: ptr WCHAR): HANDLE {.
       stdcall, dynlib: "kernel32", importc: "CreateEventW", sideEffect.}

  proc setEvent*(hEvent: HANDLE): WINBOOL {.
       stdcall, dynlib: "kernel32", importc: "SetEvent", sideEffect.}

  proc createNamedPipe*(lpName: LPWSTR,
                        dwOpenMode, dwPipeMode, nMaxInstances, nOutBufferSize,
                        nInBufferSize, nDefaultTimeOut: DWORD,
                        lpSecurityAttributes: ptr SECURITY_ATTRIBUTES
                       ): HANDLE {.
       stdcall, dynlib: "kernel32", importc: "CreateNamedPipeW", sideEffect.}

  proc createFile*(lpFileName: LPWSTR, dwDesiredAccess, dwShareMode: DWORD,
                   lpSecurityAttributes: pointer,
                   dwCreationDisposition, dwFlagsAndAttributes: DWORD,
                   hTemplateFile: HANDLE): HANDLE {.
       stdcall, dynlib: "kernel32", importc: "CreateFileW", sideEffect.}

  proc reOpenFile*(hOriginalFile: HANDLE, dwDesiredAccess, dwShareMode,
                   dwFlagsAndAttributes: DWORD): HANDLE {.
       stdcall, dynlib: "kernel32", importc: "ReOpenFile", sideEffect.}

  proc writeFile*(hFile: HANDLE, buffer: pointer, nNumberOfBytesToWrite: DWORD,
                lpNumberOfBytesWritten: ptr DWORD,
                lpOverlapped: pointer): WINBOOL {.
       stdcall, dynlib: "kernel32", importc: "WriteFile", sideEffect.}

  proc readFile*(hFile: HANDLE, buffer: pointer, nNumberOfBytesToRead: DWORD,
                 lpNumberOfBytesRead: ptr DWORD,
                 lpOverlapped: pointer): WINBOOL {.
       stdcall, dynlib: "kernel32", importc: "ReadFile", sideEffect.}

  proc cancelIo*(hFile: HANDLE): WINBOOL {.
       stdcall, dynlib: "kernel32", importc: "CancelIo", sideEffect.}

  proc connectNamedPipe*(hPipe: HANDLE,
                         lpOverlapped: ptr OVERLAPPED): WINBOOL {.
       stdcall, dynlib: "kernel32", importc: "ConnectNamedPipe", sideEffect.}

  proc disconnectNamedPipe*(hPipe: HANDLE): WINBOOL {.
       stdcall, dynlib: "kernel32", importc: "DisconnectNamedPipe", sideEffect.}

  proc setNamedPipeHandleState*(hPipe: HANDLE, lpMode, lpMaxCollectionCount,
                                lpCollectDataTimeout: ptr DWORD): WINBOOL {.
       stdcall, dynlib: "kernel32", importc: "SetNamedPipeHandleState",
       sideEffect.}

  proc resetEvent*(hEvent: HANDLE): WINBOOL {.
       stdcall, dynlib: "kernel32", importc: "ResetEvent", sideEffect.}

  proc getAdaptersAddresses*(family: uint32, flags: uint32, reserved: pointer,
                             addresses: ptr IpAdapterAddressesXp,
                             sizeptr: ptr uint32): uint32 {.
       stdcall, dynlib: "iphlpapi", importc: "GetAdaptersAddresses",
       sideEffect.}

  proc wideCharToMultiByte*(codePage: uint32, dwFlags: uint32,
                            lpWideCharStr: LPWSTR, cchWideChar: cint,
                            lpMultiByteStr: ptr char, cbMultiByte: cint,
                            lpDefaultChar: ptr char,
                            lpUsedDefaultChar: ptr uint32): cint {.
       stdcall, dynlib: "kernel32", importc: "WideCharToMultiByte", sideEffect.}

  proc multiByteToWideChar*(codePage: uint32, dwFlags: uint32,
                            lpMultiByteStr: ptr char, cbMultiByte: cint,
                            lpWideCharStr: LPWSTR, cchWideChar: cint): cint {.
       stdcall, dynlib: "kernel32", importc: "MultiByteToWideChar", sideEffect.}

  proc getBestRouteXp*(dwDestAddr: uint32, dwSourceAddr: uint32,
                       pBestRoute: ptr MibIpForwardRow): uint32 {.
       stdcall, dynlib: "iphlpapi", importc: "GetBestRoute", sideEffect.}

  proc queryPerformanceCounter*(res: var uint64) {.
       stdcall, dynlib: "kernel32", importc: "QueryPerformanceCounter",
       sideEffect.}

  proc queryPerformanceFrequency*(res: var uint64) {.
       stdcall, dynlib: "kernel32", importc: "QueryPerformanceFrequency",
       sideEffect.}

  proc getEnvironmentStringsW*(): LPWSTR {.
       stdcall, dynlib: "kernel32", importc: "GetEnvironmentStringsW",
       sideEffect.}

  proc freeEnvironmentStringsW*(penv: LPWSTR): WINBOOL {.
       stdcall, dynlib: "kernel32", importc: "FreeEnvironmentStringsW",
       sideEffect.}

  proc wcschr*(ws: LPWSTR, wc: WCHAR): LPWSTR {.
       stdcall, dynlib: "ntdll", importc: "wcschr", sideEffect.}

  proc getModuleHandle*(lpModuleName: WideCString): HANDLE {.
       stdcall, dynlib: "kernel32", importc: "GetModuleHandleW", sideEffect.}

  proc getProcAddress*(hModule: HANDLE, lpProcName: cstring): pointer {.
       stdcall, dynlib: "kernel32", importc: "GetProcAddress", sideEffect.}

  proc rtlNtStatusToDosError*(code: uint64): ULONG {.
       stdcall, dynlib: "ntdll", importc: "RtlNtStatusToDosError", sideEffect.}

  proc getConsoleCP*(): UINT {.
       stdcall, dynlib: "kernel32", importc: "GetConsoleCP", sideEffect.}

  proc setConsoleCtrlHandler*(handleRoutine: PHANDLER_ROUTINE,
                              add: WINBOOL): WINBOOL {.
       stdcall, dynlib: "kernel32", importc: "SetConsoleCtrlHandler",
       sideEffect.}

  proc generateConsoleCtrlEvent*(dwCtrlEvent: DWORD,
                                 dwProcessGroupId: DWORD): WINBOOL {.
       stdcall, dynlib: "kernel32", importc: "GenerateConsoleCtrlEvent",
       sideEffect.}

  proc `==`*(x, y: SocketHandle): bool {.borrow.}
  proc `==`*(x, y: HANDLE): bool {.borrow.}

  proc c_signal*(sign: cint, handler: WindowsSigHandler): WindowsSigHandler {.
    importc: "signal", header: "<signal.h>", raises: [], sideEffect.}

  const
    SIGABRT* = cint(22)
    SIGINT* = cint(2)
    SIGQUIT* = cint(3)
    SIGTERM* = cint(15)
    SIGFPE* = cint(8)
    SIGILL* = cint(4)
    SIGSEGV* = cint(11)
    SIG_DFL* = cast[WindowsSigHandler](0)
    SIG_IGN* = cast[WindowsSigHandler](1)
    SIG_ERR* = cast[WindowsSigHandler](-1)

  proc getSecurityAttributes*(inheritHandle = false): SECURITY_ATTRIBUTES =
    SECURITY_ATTRIBUTES(
      nLength: DWORD(sizeof(SECURITY_ATTRIBUTES)),
      lpSecurityDescriptor: nil,
      bInheritHandle: if inheritHandle: TRUE else: FALSE
    )

elif defined(macos) or defined(macosx):
  from std/posix import close, shutdown, socket, getpeername, getsockname,
                        recvfrom, sendto, send, bindSocket, recv, connect,
                        unlink, listen, getaddrinfo, gai_strerror, getrlimit,
                        setrlimit, getpid, pthread_sigmask, sigprocmask,
                        sigemptyset, sigaddset, sigismember, fcntl, accept,
                        pipe, write, signal, read, setsockopt, getsockopt,
                        getcwd, chdir, waitpid, kill,
                        Timeval, Timespec, Pid, Mode, Time, Sigset, SockAddr,
                        SockLen, Sockaddr_storage, Sockaddr_in, Sockaddr_in6,
                        Sockaddr_un, SocketHandle, AddrInfo, RLimit,
                        F_GETFL, F_SETFL, F_GETFD, F_SETFD, FD_CLOEXEC,
                        O_NONBLOCK, SOL_SOCKET, SOCK_RAW, MSG_NOSIGNAL,
                        AF_INET, AF_INET6, SO_ERROR, SO_REUSEADDR,
                        SO_REUSEPORT, SO_BROADCAST, IPPROTO_IP,
                        IPV6_MULTICAST_HOPS, SOCK_DGRAM, RLIMIT_NOFILE,
                        SIG_BLOCK, SIG_UNBLOCK,
                        SIGHUP, SIGINT, SIGQUIT, SIGILL, SIGTRAP, SIGABRT,
                        SIGBUS, SIGFPE, SIGKILL, SIGUSR1, SIGSEGV, SIGUSR2,
                        SIGPIPE, SIGALRM, SIGTERM, SIGPIPE, SIGCHLD, SIGSTOP,
                        SIGCONT

  export close, shutdown, socket, getpeername, getsockname,
         recvfrom, sendto, send, bindSocket, recv, connect,
         unlink, listen, getaddrinfo, gai_strerror, getrlimit,
         setrlimit, getpid, pthread_sigmask, sigprocmask,
         sigemptyset, sigaddset, sigismember, fcntl, accept,
         pipe, write, signal, read, setsockopt, getsockopt,
         getcwd, chdir, waitpid, kill,
         Timeval, Timespec, Pid, Mode, Time, Sigset, SockAddr,
         SockLen, Sockaddr_storage, Sockaddr_in, Sockaddr_in6,
         Sockaddr_un, SocketHandle, AddrInfo, RLimit,
         F_GETFL, F_SETFL, F_GETFD, F_SETFD, FD_CLOEXEC,
         O_NONBLOCK, SOL_SOCKET, SOCK_RAW, MSG_NOSIGNAL,
         AF_INET, AF_INET6, SO_ERROR, SO_REUSEADDR,
         SO_REUSEPORT, SO_BROADCAST, IPPROTO_IP,
         IPV6_MULTICAST_HOPS, SOCK_DGRAM, RLIMIT_NOFILE,
         SIG_BLOCK, SIG_UNBLOCK,
         SIGHUP, SIGINT, SIGQUIT, SIGILL, SIGTRAP, SIGABRT,
         SIGBUS, SIGFPE, SIGKILL, SIGUSR1, SIGSEGV, SIGUSR2,
         SIGPIPE, SIGALRM, SIGTERM, SIGPIPE, SIGCHLD, SIGSTOP,
         SIGCONT

  type
    MachTimebaseInfo* {.importc: "struct mach_timebase_info",
                        header: "<mach/mach_time.h>", pure, final.} = object
      numer*: uint32
      denom*: uint32

  proc posix_gettimeofday*(tp: var Timeval, unused: pointer = nil) {.
       importc: "gettimeofday", header: "<sys/time.h>".}

  proc mach_timebase_info*(info: var MachTimebaseInfo) {.
       importc, header: "<mach/mach_time.h>".}

  proc mach_absolute_time*(): uint64 {.
       importc, header: "<mach/mach_time.h>".}

elif defined(linux):
  from std/posix import close, shutdown, sigemptyset, sigaddset, sigismember,
                        sigdelset, write, read, waitid, getaddrinfo,
                        gai_strerror, setsockopt, getsockopt, socket,
                        getrlimit, setrlimit, getpeername, getsockname,
                        recvfrom, sendto, send, bindSocket, recv, connect,
                        unlink, listen, sendmsg, recvmsg, getpid, fcntl,
                        pthread_sigmask, sigprocmask, clock_gettime, signal,
                        getcwd, chdir, waitpid, kill,
                        ClockId, Itimerspec, Timespec, Sigset, Time, Pid, Mode,
                        SigInfo, Id, Tmsghdr, IOVec, RLimit,
                        SockAddr, SockLen, Sockaddr_storage, Sockaddr_in,
                        Sockaddr_in6, Sockaddr_un, AddrInfo, SocketHandle,
                        CLOCK_MONOTONIC, F_GETFL, F_SETFL, F_GETFD, F_SETFD,
                        FD_CLOEXEC, O_NONBLOCK, SIG_BLOCK, SIG_UNBLOCK,
                        SOL_SOCKET, SO_ERROR, RLIMIT_NOFILE, MSG_NOSIGNAL,
                        AF_INET, AF_INET6, SO_REUSEADDR, SO_REUSEPORT,
                        SO_BROADCAST, IPPROTO_IP, IPV6_MULTICAST_HOPS,
                        SOCK_DGRAM,
                        SIGHUP, SIGINT, SIGQUIT, SIGILL, SIGTRAP, SIGABRT,
                        SIGBUS, SIGFPE, SIGKILL, SIGUSR1, SIGSEGV, SIGUSR2,
                        SIGPIPE, SIGALRM, SIGTERM, SIGPIPE, SIGCHLD, SIGSTOP,
                        SIGCONT

  export close, shutdown, sigemptyset, sigaddset, sigismember,
         sigdelset, write, read, waitid, getaddrinfo,
         gai_strerror, setsockopt, getsockopt, socket,
         getrlimit, setrlimit, getpeername, getsockname,
         recvfrom, sendto, send, bindSocket, recv, connect,
         unlink, listen, sendmsg, recvmsg, getpid, fcntl,
         pthread_sigmask, sigprocmask, clock_gettime, signal,
         getcwd, chdir, waitpid, kill,
         ClockId, Itimerspec, Timespec, Sigset, Time, Pid, Mode,
         SigInfo, Id, Tmsghdr, IOVec, RLimit,
         SockAddr, SockLen, Sockaddr_storage, Sockaddr_in,
         Sockaddr_in6, Sockaddr_un, AddrInfo, SocketHandle,
         CLOCK_MONOTONIC, F_GETFL, F_SETFL, F_GETFD, F_SETFD,
         FD_CLOEXEC, O_NONBLOCK, SIG_BLOCK, SIG_UNBLOCK,
         SOL_SOCKET, SO_ERROR, RLIMIT_NOFILE, MSG_NOSIGNAL,
         AF_INET, AF_INET6, SO_REUSEADDR, SO_REUSEPORT,
         SO_BROADCAST, IPPROTO_IP, IPV6_MULTICAST_HOPS,
         SOCK_DGRAM,
         SIGHUP, SIGINT, SIGQUIT, SIGILL, SIGTRAP, SIGABRT,
         SIGBUS, SIGFPE, SIGKILL, SIGUSR1, SIGSEGV, SIGUSR2,
         SIGPIPE, SIGALRM, SIGTERM, SIGPIPE, SIGCHLD, SIGSTOP,
         SIGCONT

  when not defined(android) and defined(amd64):
    const IP_MULTICAST_TTL*: cint = 33
  else:
    var IP_MULTICAST_TTL* {.importc: "IP_MULTICAST_TTL",
                            header: "<netinet/in.h>".}: cint
  const
    EPOLLIN* = 0x00000001
    EPOLLPRI* = 0x00000002
    EPOLLOUT* = 0x00000004
    EPOLLERR* = 0x00000008
    EPOLLHUP* = 0x00000010
    EPOLLRDNORM* = 0x00000040
    EPOLLRDBAND* = 0x00000080
    EPOLLWRNORM* = 0x00000100
    EPOLLWRBAND* = 0x00000200
    EPOLLMSG* = 0x00000400
    EPOLLRDHUP* = 0x00002000
    EPOLLEXCLUSIVE* = 1 shl 28
    EPOLLWAKEUP* = 1 shl 29
    EPOLLONESHOT* = 1 shl 30
    EPOLLET* = 1 shl 31

    SFD_CLOEXEC* = cint(0x80000)
    SFD_NONBLOCK* = cint(0x800)
    EFD_CLOEXEC* = cint(0x80000)
    EFD_NONBLOCK* = cint(0x800)
    TFD_CLOEXEC* = cint(0x80000)
    TFD_NONBLOCK* = cint(0x800)

    EPOLL_CTL_ADD* = 1
    EPOLL_CTL_DEL* = 2
    EPOLL_CTL_MOD* = 3

  # https://github.com/torvalds/linux/blob/ff6992735ade75aae3e35d16b17da1008d753d28/include/uapi/linux/eventpoll.h#L77
  when defined(linux) and defined(amd64):
    {.pragma: epollPacked, packed.}
  else:
    {.pragma: epollPacked.}

  type
    EpollData* {.importc: "epoll_data_t",
                 header: "<sys/epoll.h>", pure, final, union.} = object
      `ptr`* {.importc: "ptr".}: pointer
      fd* {.importc: "fd".}: cint
      u32* {.importc: "u32".}: uint32
      u64* {.importc: "u64".}: uint64

    EpollEvent* {.importc: "struct epoll_event",
                  header: "<sys/epoll.h>", pure, final, epollPacked.} = object
      events*: uint32 # Epoll events
      data*: EpollData # User data variable

    SignalFdInfo* {.importc: "struct signalfd_siginfo",
                    header: "<sys/signalfd.h>", pure, final.} = object
      ssi_signo*: uint32
      ssi_errno*: int32
      ssi_code*: int32
      ssi_pid*: uint32
      ssi_uid*: uint32
      ssi_fd*: int32
      ssi_tid*: uint32
      ssi_band*: uint32
      ssi_overrun*: uint32
      ssi_trapno*: uint32
      ssi_status*: int32
      ssi_int*: int32
      ssi_ptr*: uint64
      ssi_utime*: uint64
      ssi_stime*: uint64
      ssi_addr*: uint64
      pad* {.importc: "__pad".}: array[0..47, uint8]

  proc epoll_create*(size: cint): cint {.importc: "epoll_create",
       header: "<sys/epoll.h>", sideEffect.}

  proc epoll_create1*(flags: cint): cint {.importc: "epoll_create1",
       header: "<sys/epoll.h>", sideEffect.}

  proc epoll_ctl*(epfd: cint; op: cint; fd: cint; event: ptr EpollEvent): cint {.
       importc: "epoll_ctl", header: "<sys/epoll.h>", sideEffect.}

  proc epoll_wait*(epfd: cint; events: ptr EpollEvent; maxevents: cint;
                   timeout: cint): cint {.
       importc: "epoll_wait", header: "<sys/epoll.h>", sideEffect.}

  proc timerfd_create*(clock_id: ClockId, flags: cint): cint {.
       cdecl, importc: "timerfd_create", header: "<sys/timerfd.h>".}
  proc timerfd_settime*(ufd: cint, flags: cint,
                        utmr: var Itimerspec, otmr: var Itimerspec): cint {.
       cdecl, importc: "timerfd_settime", header: "<sys/timerfd.h>".}
  proc eventfd*(count: cuint, flags: cint): cint {.
       cdecl, importc: "eventfd", header: "<sys/eventfd.h>".}
  proc signalfd*(fd: cint, mask: var Sigset, flags: cint): cint {.
       cdecl, importc: "signalfd", header: "<sys/signalfd.h>".}

elif defined(freebsd) or defined(openbsd) or defined(netbsd) or
     defined(dragonfly):
  from std/posix import close, shutdown, socket, getpeername, getsockname,
                        recvfrom, sendto, send, bindSocket, recv, connect,
                        unlink, listen, getaddrinfo, gai_strerror, getrlimit,
                        setrlimit, getpid, pthread_sigmask, sigemptyset,
                        sigaddset, sigismember, fcntl, accept, pipe, write,
                        signal, read, setsockopt, getsockopt, clock_gettime,
                        getcwd, chdir, waitpid, kill,
                        Timeval, Timespec, Pid, Mode, Time, Sigset, SockAddr,
                        SockLen, Sockaddr_storage, Sockaddr_in, Sockaddr_in6,
                        Sockaddr_un, SocketHandle, AddrInfo, RLimit,
                        F_GETFL, F_SETFL, F_GETFD, F_SETFD, FD_CLOEXEC,
                        O_NONBLOCK, SOL_SOCKET, SOCK_RAW, MSG_NOSIGNAL,
                        AF_INET, AF_INET6, SO_ERROR, SO_REUSEADDR,
                        SO_REUSEPORT, SO_BROADCAST, IPPROTO_IP,
                        IPV6_MULTICAST_HOPS, SOCK_DGRAM, RLIMIT_NOFILE,
                        SIG_BLOCK, SIG_UNBLOCK, CLOCK_MONOTONIC,
                        SIGHUP, SIGINT, SIGQUIT, SIGILL, SIGTRAP, SIGABRT,
                        SIGBUS, SIGFPE, SIGKILL, SIGUSR1, SIGSEGV, SIGUSR2,
                        SIGPIPE, SIGALRM, SIGTERM, SIGPIPE, SIGCHLD, SIGSTOP,
                        SIGCONT

  export close, shutdown, socket, getpeername, getsockname,
         recvfrom, sendto, send, bindSocket, recv, connect,
         unlink, listen, getaddrinfo, gai_strerror, getrlimit,
         setrlimit, getpid, pthread_sigmask, sigemptyset,
         sigaddset, sigismember, fcntl, accept, pipe, write,
         signal, read, setsockopt, getsockopt, clock_gettime,
         Timeval, Timespec, Pid, Mode, Time, Sigset, SockAddr,
         SockLen, Sockaddr_storage, Sockaddr_in, Sockaddr_in6,
         Sockaddr_un, SocketHandle, AddrInfo, RLimit,
         F_GETFL, F_SETFL, F_GETFD, F_SETFD, FD_CLOEXEC,
         O_NONBLOCK, SOL_SOCKET, SOCK_RAW, MSG_NOSIGNAL,
         AF_INET, AF_INET6, SO_ERROR, SO_REUSEADDR,
         SO_REUSEPORT, SO_BROADCAST, IPPROTO_IP,
         IPV6_MULTICAST_HOPS, SOCK_DGRAM, RLIMIT_NOFILE,
         SIG_BLOCK, SIG_UNBLOCK, CLOCK_MONOTONIC,
         SIGHUP, SIGINT, SIGQUIT, SIGILL, SIGTRAP, SIGABRT,
         SIGBUS, SIGFPE, SIGKILL, SIGUSR1, SIGSEGV, SIGUSR2,
         SIGPIPE, SIGALRM, SIGTERM, SIGPIPE, SIGCHLD, SIGSTOP,
         SIGCONT

  var IP_MULTICAST_TTL* {.importc: "IP_MULTICAST_TTL",
                          header: "<netinet/in.h>".}: cint

when defined(linux) or defined(freebsd) or defined(openbsd) or
     defined(netbsd) or defined(dragonfly):

  proc pipe2*(a: array[0..1, cint], flags: cint): cint {.
       importc, header: "<unistd.h>", sideEffect.}

  proc accept4*(a1: cint, a2: ptr SockAddr, a3: ptr SockLen, a4: cint): cint {.
       importc, header: "<sys/socket.h>", sideEffect.}

when defined(linux):
  const
    SOCK_NONBLOCK* = 0x800
    SOCK_CLOEXEC* = 0x80000
    TCP_NODELAY* = cint(1)
    IPPROTO_TCP* = 6
elif defined(freebsd) or defined(netbsd) or defined(dragonfly):
  const
    SOCK_NONBLOCK* = 0x20000000
    SOCK_CLOEXEC* = 0x10000000
    TCP_NODELAY* = cint(1)
    IPPROTO_TCP* = 6
elif defined(openbsd):
  const
    SOCK_CLOEXEC* = 0x8000
    SOCK_NONBLOCK* = 0x4000
    TCP_NODELAY* = cint(1)
    IPPROTO_TCP* = 6
elif defined(macos) or defined(macosx):
  const
    TCP_NODELAY* = cint(1)
    IP_MULTICAST_TTL* = cint(10)
    IPPROTO_TCP* = 6

when defined(linux):
  const
    O_CLOEXEC* = 0x80000
    POSIX_SPAWN_USEVFORK* = 0x40
elif defined(freebsd):
  const
    O_CLOEXEC* = 0x00100000
    POSIX_SPAWN_USEVFORK* = 0x00
elif defined(openbsd):
  const
    O_CLOEXEC* = 0x10000
    POSIX_SPAWN_USEVFORK* = 0x00
elif defined(netbsd):
  const
    O_CLOEXEC* = 0x00400000
    POSIX_SPAWN_USEVFORK* = 0x00
elif defined(dragonfly):
  const
    O_CLOEXEC* = 0x00020000
    POSIX_SPAWN_USEVFORK* = 0x00
elif defined(macos) or defined(macosx):
  const
    POSIX_SPAWN_USEVFORK* = 0x00

when defined(linux) or defined(macos) or defined(macosx) or defined(freebsd) or
     defined(openbsd) or defined(netbsd) or defined(dragonfly):

  const
    POSIX_SPAWN_RESETIDS* = 0x01
    POSIX_SPAWN_SETPGROUP* = 0x02
    POSIX_SPAWN_SETSCHEDPARAM* = 0x04
    POSIX_SPAWN_SETSCHEDULER* = 0x08
    POSIX_SPAWN_SETSIGDEF* = 0x10
    POSIX_SPAWN_SETSIGMASK* = 0x20

  type
    SchedParam* {.importc: "struct sched_param", header: "<sched.h>",
                  final, pure.} = object ## struct sched_param
      sched_priority*: cint
      sched_ss_low_priority*: cint     ## Low scheduling priority for
                                       ## sporadic server.
      sched_ss_repl_period*: Timespec  ## Replenishment period for
                                       ## sporadic server.
      sched_ss_init_budget*: Timespec  ## Initial budget for sporadic server.
      sched_ss_max_repl*: cint         ## Maximum pending replenishments for
                                       ## sporadic server.

    PosixSpawnAttr* {.importc: "posix_spawnattr_t",
                      header: "<spawn.h>", final, pure.} = object
      flags*: cshort
      pgrp*: Pid
      sd*: Sigset
      ss*: Sigset
      sp*: SchedParam
      policy*: cint
      pad*: array[16, cint]

    PosixSpawnFileActions* {.importc: "posix_spawn_file_actions_t",
                             header: "<spawn.h>", final, pure.} = object
      allocated*: cint
      used*: cint
      actions*: pointer
      pad*: array[16, cint]

  proc posixSpawn*(a1: var Pid, a2: cstring, a3: var PosixSpawnFileActions,
                   a4: var PosixSpawnAttr, a5, a6: cstringArray): cint {.
       importc: "posix_spawn", header: "<spawn.h>", sideEffect.}
  proc posixSpawnp*(a1: var Pid, a2: cstring, a3: var PosixSpawnFileActions,
                    a4: var PosixSpawnAttr, a5, a6: cstringArray): cint {.
       importc: "posix_spawnp", header: "<spawn.h>", sideEffect.}

  proc posixSpawnFileActionsInit*(a1: var PosixSpawnFileActions): cint {.
       importc: "posix_spawn_file_actions_init", header: "<spawn.h>",
       sideEffect.}
  proc posixSpawnFileActionsDestroy*(a1: var PosixSpawnFileActions): cint {.
       importc: "posix_spawn_file_actions_destroy", header: "<spawn.h>",
       sideEffect.}

  proc posixSpawnFileActionsAddClose*(a1: var PosixSpawnFileActions,
                                      a2: cint): cint {.
       importc: "posix_spawn_file_actions_addclose", header: "<spawn.h>",
       sideEffect.}
  proc posixSpawnFileActionsAddDup2*(a1: var PosixSpawnFileActions,
                                     a2, a3: cint): cint {.
       importc: "posix_spawn_file_actions_adddup2", header: "<spawn.h>",
       sideEffect.}
  proc posixSpawnFileActionsAddOpen*(a1: var PosixSpawnFileActions,
                                     a2: cint, a3: cstring, a4: cint,
                                     a5: Mode): cint {.
       importc: "posix_spawn_file_actions_addopen", header: "<spawn.h>",
       sideEffect.}

  proc posixSpawnAttrInit*(a1: var PosixSpawnAttr): cint {.
       importc: "posix_spawnattr_init", header: "<spawn.h>",
       sideEffect.}
  proc posixSpawnAttrDestroy*(a1: var PosixSpawnAttr): cint {.
       importc: "posix_spawnattr_destroy", header: "<spawn.h>",
       sideEffect.}

  proc posixSpawnAttrGetSigDefault*(a1: var PosixSpawnAttr,
                                    a2: var Sigset): cint {.
       importc: "posix_spawnattr_getsigdefault", header: "<spawn.h>",
       sideEffect.}
  proc posixSpawnAttrSetSigDefault*(a1: var PosixSpawnAttr,
                                    a2: var Sigset): cint {.
       importc: "posix_spawnattr_setsigdefault", header: "<spawn.h>",
       sideEffect.}
  proc posixSpawnAttrGetFlags*(a1: var PosixSpawnAttr,
                               a2: var cshort): cint {.
       importc: "posix_spawnattr_getflags", header: "<spawn.h>",
       sideEffect.}
  proc posixSpawnAttrSetFlags*(a1: var PosixSpawnAttr, a2: cint): cint {.
       importc: "posix_spawnattr_setflags", header: "<spawn.h>",
       sideEffect.}
  proc posixSpawnAttrGetPgroup*(a1: var PosixSpawnAttr,
                                a2: var Pid): cint {.
       importc: "posix_spawnattr_getpgroup", header: "<spawn.h>",
       sideEffect.}
  proc posixSpawnAttrSetPgroup*(a1: var PosixSpawnAttr, a2: Pid): cint {.
       importc: "posix_spawnattr_setpgroup", header: "<spawn.h>",
       sideEffect.}
  proc posixSpawnAttrGetSchedParam*(a1: var PosixSpawnAttr,
                                    a2: var SchedParam): cint {.
       importc: "posix_spawnattr_getschedparam", header: "<spawn.h>",
       sideEffect.}
  proc posixSpawnAttrSetSchedParam*(a1: var PosixSpawnAttr,
                                    a2: var SchedParam): cint {.
       importc: "posix_spawnattr_setschedparam", header: "<spawn.h>",
       sideEffect.}
  proc posixSpawnAttrGetSchedPolicy*(a1: var PosixSpawnAttr,
                                     a2: var cint): cint {.
       importc: "posix_spawnattr_getschedpolicy", header: "<spawn.h>",
       sideEffect.}
  proc posixSpawnAttrSetSchedPolicy*(a1: var PosixSpawnAttr,
                                     a2: cint): cint {.
       importc: "posix_spawnattr_setschedpolicy", header: "<spawn.h>",
       sideEffect.}
  proc posixSpawnAttrGetSigMask*(a1: var PosixSpawnAttr,
                                 a2: var Sigset): cint {.
       importc: "posix_spawnattr_getsigmask", header: "<spawn.h>",
       sideEffect.}
  proc posixSpawnAttrSetSigMask*(a1: var PosixSpawnAttr,
                                 a2: var Sigset): cint {.
       importc: "posix_spawnattr_setsigmask", header: "<spawn.h>",
       sideEffect.}

when defined(linux):
  const
    P_PID* = cint(1)
    WNOHANG* = cint(1)
    WSTOPPED* = cint(2)
    WEXITED* = cint(4)
    WNOWAIT* = cint(0x01000000)
  template WSTATUS(s: cint): cint =
    s and 0x7F
  template WAITEXITSTATUS*(s: cint): cint =
    (s and 0xFF00) shr 8
  template WAITTERMSIG*(s: cint): cint =
    WSTATUS(s)
  template WAITSTOPSIG*(s: cint): cint =
    WAITEXITSTATUS(s)
  template WAITIFEXITED*(s: cint): bool =
    WSTATUS(s) == 0
  template WAITIFSIGNALED*(s: cint): bool =
    (cast[int8](WSTATUS(s) + 1) shr 1) > 0
  template WAITIFSTOPPED*(s: cint): bool =
    (s and 0xFF) == 0x7F
  template WAITIFCONTINUED*(s: cint): bool =
    s == 0xFFFF
elif defined(openbsd):
  const WNOHANG* = 1
  template WSTATUS(s: cint): cint =
    s and 0x7F
  template WAITEXITSTATUS*(s: cint): cint =
    (s shr 8) and 0xFF
  template WAITTERMSIG*(s: cint): cint =
    WSTATUS(s)
  template WAITSTOPSIG*(s: cint): cint =
    WAITEXITSTATUS(s)
  template WAITIFEXITED*(s: cint): bool =
    WSTATUS(s) == 0
  template WAITIFSIGNALED*(s: cint): bool =
    (WAITTERMSIG(s) != 0x7F) and (WSTATUS(s) != 0)
  template WAITIFSTOPPED*(s: cint): bool =
    WSTATUS(s) == 0x7F
  template WAITIFCONTINUED*(s: cint): bool =
    s == 0xFFFF
elif defined(dragonfly):
  const WNOHANG* = 1
  template WSTATUS(s: cint): cint =
    s and 0x7F
  template WAITEXITSTATUS*(s: cint): cint =
    (s shr 8)
  template WAITTERMSIG*(s: cint): cint =
    WSTATUS(s)
  template WAITSTOPSIG*(s: cint): cint =
    WAITEXITSTATUS(s)
  template WAITIFEXITED*(s: cint): bool =
    WSTATUS(s) == 0
  template WAITIFSIGNALED*(s: cint): bool =
    (WAITTERMSIG(s) != 0x7F) and (WSTATUS(s) != 0)
  template WAITIFSTOPPED*(s: cint): bool =
    WSTATUS(s) == 0x7F
  template WAITIFCONTINUED*(s: cint): bool =
    s == 19
elif defined(netbsd):
  const WNOHANG* = 1
  template WSTATUS(s: cint): cint =
    s and 0x7F
  template WAITEXITSTATUS*(s: cint): cint =
    (s shr 8) and 0xFF
  template WAITTERMSIG*(s: cint): cint =
    WSTATUS(s)
  template WAITSTOPSIG*(s: cint): cint =
    WAITEXITSTATUS(s)
  template WAITIFEXITED*(s: cint): bool =
    WSTATUS(s) == 0
  template WAITIFSIGNALED*(s: cint): bool =
    not(WAITIFSTOPPED(s)) and not(WAITIFCONTINUED(s)) and not(WAITIFEXITED(s))
  template WAITIFSTOPPED*(s: cint): bool =
    (WSTATUS(s) == 0x7F) and not(WAITIFCONTINUED(s))
  template WAITIFCONTINUED*(s: cint): bool =
    s == 0xFFFF
elif defined(freebsd):
  const WNOHANG* = 1
  template WSTATUS(s: cint): cint =
    s and 0x7F
  template WAITEXITSTATUS*(s: cint): cint =
    s shr 8
  template WAITTERMSIG*(s: cint): cint =
    WSTATUS(s)
  template WAITSTOPSIG*(s: cint): cint =
    s shr 8
  template WAITIFEXITED*(s: cint): bool =
    WSTATUS(s) == 0
  template WAITIFSIGNALED*(s: cint): bool =
    let wstatus = WSTATUS(s)
    (wstatus != 0x7F) and (wstatus != 0) and (s != 0x13)
  template WAITIFSTOPPED*(s: cint): bool =
    WSTATUS(s) == 0x7F
  template WAITIFCONTINUED*(s: cint): bool =
    x == 0x13
elif defined(macos) or defined(macosx):
  const WNOHANG* = 1
  template WSTATUS(s: cint): cint =
    s and 0x7F
  template WAITEXITSTATUS*(s: cint): cint =
    (s shr 8) and 0xFF
  template WAITTERMSIG*(s: cint): cint =
    WSTATUS(s)
  template WAITSTOPSIG*(s: cint): cint =
    s shr 8
  template WAITIFEXITED*(s: cint): bool =
    WSTATUS(s) == 0
  template WAITIFSIGNALED*(s: cint): bool =
    let wstatus = WSTATUS(s)
    (wstatus != 0x7F) and (wstatus != 0)
  template WAITIFSTOPPED*(s: cint): bool =
    (WSTATUS(s) == 0x7F) and (WAITSTOPSIG(s) != 0x13)
  template WAITIFCONTINUED*(s: cint): bool =
    (WSTATUS(s) == 0x7F) and (WAITSTOPSIG(s) == 0x13)
elif defined(posix):
  proc WAITEXITSTATUS*(s: cint): cint {.
       importc: "WEXITSTATUS", header: "<sys/wait.h>".}
    ## Exit code, iff WIFEXITED(s)
  proc WAITTERMSIG*(s: cint): cint {.
       importc: "WTERMSIG", header: "<sys/wait.h>".}
    ## Termination signal, iff WIFSIGNALED(s)
  proc WAITSTOPSIG*(s: cint): cint {.
       importc: "WSTOPSIG", header: "<sys/wait.h>".}
    ## Stop signal, iff WIFSTOPPED(s)
  proc WAITIFEXITED*(s: cint): bool {.
       importc: "WIFEXITED", header: "<sys/wait.h>".}
    ## True if child exited normally.
  proc WAITIFSIGNALED*(s: cint): bool {.
       importc: "WIFSIGNALED", header: "<sys/wait.h>".}
    ## True if child exited due to uncaught signal.
  proc WAITIFSTOPPED*(s: cint): bool {.
       importc: "WIFSTOPPED", header: "<sys/wait.h>".}
    ## True if child is currently stopped.
  proc WAITIFCONTINUED*(s: cint): bool {.
       importc: "WIFCONTINUED", header: "<sys/wait.h>".}
    ## True if child has been continued.

when defined(posix):
  const
    INVALID_SOCKET* = SocketHandle(-1)
    INVALID_HANDLE_VALUE* = cint(-1)

proc `==`*(x: SocketHandle, y: int): bool = int(x) == y

when defined(macosx) or defined(macos) or defined(bsd):
  const
    AF_LINK* = 18
    IFF_UP* = 0x01
    IFF_RUNNING* = 0x40

    PF_ROUTE* = cint(17)
    RTM_GET* = 0x04'u8
    RTF_UP* = 0x01
    RTF_GATEWAY* = 0x02
    RTM_VERSION* = 5'u8

    RTA_DST* = 0x01
    RTA_GATEWAY* = 0x02

  type
    IfAddrs* {.importc: "struct ifaddrs", header: "<ifaddrs.h>",
               pure, final.} = object
      ifa_next* {.importc: "ifa_next".}: ptr IfAddrs
      ifa_name* {.importc: "ifa_name".}: ptr cchar
      ifa_flags* {.importc: "ifa_flags".}: cuint
      ifa_addr* {.importc: "ifa_addr".}: ptr SockAddr
      ifa_netmask* {.importc: "ifa_netmask".}: ptr SockAddr
      ifa_dstaddr* {.importc: "ifa_dstaddr".}: ptr SockAddr
      ifa_data* {.importc: "ifa_data".}: pointer

    PIfAddrs* = ptr IfAddrs

    IfData* {.importc: "struct if_data", header: "<net/if.h>",
              pure, final.} = object
      ifi_type* {.importc: "ifi_type".}: byte
      ifi_typelen* {.importc: "ifi_typelen".}: byte
      ifi_physical* {.importc: "ifi_physical".}: byte
      ifi_addrlen* {.importc: "ifi_addrlen".}: byte
      ifi_hdrlen* {.importc: "ifi_hdrlen".}: byte
      ifi_recvquota* {.importc: "ifi_recvquota".}: byte
      ifi_xmitquota* {.importc: "ifi_xmitquota".}: byte
      ifi_unused1* {.importc: "ifi_unused1".}: byte
      ifi_mtu* {.importc: "ifi_mtu".}: uint32
      ifi_metric* {.importc: "ifi_metric".}: uint32
      ifi_baudrate* {.importc: "ifi_baudrate".}: uint32
      ifi_ipackets* {.importc: "ifi_ipackets".}: uint32
      ifi_ierrors* {.importc: "ifi_ierrors".}: uint32
      ifi_opackets* {.importc: "ifi_opackets".}: uint32
      ifi_oerrors* {.importc: "ifi_oerrors".}: uint32
      ifi_collisions* {.importc: "ifi_collisions".}: uint32
      ifi_ibytes* {.importc: "ifi_ibytes".}: uint32
      ifi_obytes* {.importc: "ifi_obytes".}: uint32
      ifi_imcasts* {.importc: "ifi_imcasts".}: uint32
      ifi_omcasts* {.importc: "ifi_omcasts".}: uint32
      ifi_iqdrops* {.importc: "ifi_iqdrops".}: uint32
      ifi_noproto* {.importc: "ifi_noproto".}: uint32
      ifi_recvtiming* {.importc: "ifi_recvtiming".}: uint32
      ifi_xmittiming* {.importc: "ifi_xmittiming".}: uint32
      ifi_lastchange* {.importc: "ifi_lastchange".}: Timeval
      ifi_unused2* {.importc: "ifi_unused2".}: uint32
      ifi_hwassist* {.importc: "ifi_hwassist".}: uint32
      ifi_reserved1* {.importc: "ifi_reserved1".}: uint32
      ifi_reserved2* {.importc: "ifi_reserved2".}: uint32

    Sockaddr_dl* = object
      sdl_len*: byte
      sdl_family*: byte
      sdl_index*: uint16
      sdl_type*: byte
      sdl_nlen*: byte
      sdl_alen*: byte
      sdl_slen*: byte
      sdl_data*: array[12, byte]

    RtMetrics* = object
      rmx_locks*: uint32
      rmx_mtu*: uint32
      rmx_hopcount*: uint32
      rmx_expire*: int32
      rmx_recvpipe*: uint32
      rmx_sendpipe*: uint32
      rmx_ssthresh*: uint32
      rmx_rtt*: uint32
      rmx_rttvar*: uint32
      rmx_pksent*: uint32
      rmx_state*: uint32
      rmx_filler*: array[3, uint32]

    RtMsgHeader* = object
      rtm_msglen*: uint16
      rtm_version*: byte
      rtm_type*: byte
      rtm_index*: uint16
      rtm_flags*: cint
      rtm_addrs*: cint
      rtm_pid*: Pid
      rtm_seq*: cint
      rtm_errno*: cint
      rtm_use*: cint
      rtm_inits*: uint32
      rtm_rmx*: RtMetrics

    RtMessage* = object
      rtm*: RtMsgHeader
      space*: array[512, byte]

  proc getIfAddrs*(ifap: ptr PIfAddrs): cint {.importc: "getifaddrs",
       header: """#include <sys/types.h>
                  #include <sys/socket.h>
                  #include <ifaddrs.h>""".}
  proc freeIfAddrs*(ifap: ptr IfAddrs) {.importc: "freeifaddrs",
       header: """#include <sys/types.h>
                  #include <sys/socket.h>
                  #include <ifaddrs.h>""".}
elif defined(linux):
  const
    AF_NETLINK* = cint(16)
    AF_PACKET* = cint(17)
    NETLINK_ROUTE* = cint(0)
    NLMSG_ALIGNTO* = 4'u
    RTA_ALIGNTO* = 4'u
    # RTA_UNSPEC* = 0'u16
    RTA_DST* = 1'u16
    # RTA_SRC* = 2'u16
    # RTA_IIF* = 3'u16
    RTA_OIF* = 4'u16
    RTA_GATEWAY* = 5'u16
    # RTA_PRIORITY* = 6'u16
    RTA_PREFSRC* = 7'u16
    # RTA_METRICS* = 8'u16

    RTM_F_LOOKUP_TABLE* = 0x1000

    RTM_GETLINK* = 18
    RTM_GETADDR* = 22
    RTM_GETROUTE* = 26
    NLM_F_REQUEST* = 1
    NLM_F_ROOT* = 0x100
    NLM_F_MATCH* = 0x200
    NLM_F_DUMP* = NLM_F_ROOT or NLM_F_MATCH
    IFLIST_REPLY_BUFFER* = 8192
    InvalidSocketHandle* = SocketHandle(-1)
    NLMSG_DONE* = 0x03
    # NLMSG_MIN_TYPE* = 0x10
    NLMSG_ERROR* = 0x02
    # MSG_TRUNC* = 0x20

    IFLA_ADDRESS* = 1
    IFLA_IFNAME* = 3
    IFLA_MTU* = 4
    IFLA_OPERSTATE* = 16

    IFA_ADDRESS* = 1
    IFA_LOCAL* = 2
    # IFA_BROADCAST* = 4

    # ARPHRD_NETROM* = 0
    ARPHRD_ETHER* = 1
    ARPHRD_EETHER* = 2
    # ARPHRD_AX25* = 3
    # ARPHRD_PRONET* = 4
    # ARPHRD_CHAOS* = 5
    # ARPHRD_IEEE802* = 6
    ARPHRD_ARCNET* = 7
    # ARPHRD_APPLETLK* = 8
    # ARPHRD_DLCI* = 15
    ARPHRD_ATM* = 19
    # ARPHRD_METRICOM* = 23
    ARPHRD_IEEE1394* = 24
    # ARPHRD_EUI64* = 27
    # ARPHRD_INFINIBAND* = 32
    ARPHRD_SLIP* = 256
    ARPHRD_CSLIP* = 257
    ARPHRD_SLIP6* = 258
    ARPHRD_CSLIP6* = 259
    # ARPHRD_RSRVD* = 260
    # ARPHRD_ADAPT* = 264
    # ARPHRD_ROSE* = 270
    # ARPHRD_X25* = 271
    # ARPHRD_HWX25* = 272
    # ARPHRD_CAN* = 280
    ARPHRD_PPP* = 512
    ARPHRD_CISCO* = 513
    ARPHRD_HDLC* = ARPHRD_CISCO
    ARPHRD_LAPB* = 516
    # ARPHRD_DDCMP* = 517
    # ARPHRD_RAWHDLC* = 518
    # ARPHRD_TUNNEL* = 768
    # ARPHRD_TUNNEL6* = 769
    ARPHRD_FRAD* = 770
    # ARPHRD_SKIP* = 771
    ARPHRD_LOOPBACK* = 772
    # ARPHRD_LOCALTLK* = 773
    # ARPHRD_FDDI* = 774
    # ARPHRD_BIF* = 775
    # ARPHRD_SIT* = 776
    # ARPHRD_IPDDP* = 777
    # ARPHRD_IPGRE* = 778
    # ARPHRD_PIMREG* = 779
    ARPHRD_HIPPI* = 780
    # ARPHRD_ASH* = 781
    # ARPHRD_ECONET* = 782
    # ARPHRD_IRDA* = 783
    # ARPHRD_FCPP* = 784
    # ARPHRD_FCAL* = 785
    # ARPHRD_FCPL* = 786
    # ARPHRD_FCFABRIC* = 787
    # ARPHRD_IEEE802_TR* = 800
    ARPHRD_IEEE80211* = 801
    ARPHRD_IEEE80211_PRISM* = 802
    ARPHRD_IEEE80211_RADIOTAP* = 803
    # ARPHRD_IEEE802154* = 804
    # ARPHRD_IEEE802154_MONITOR* = 805
    # ARPHRD_PHONET* = 820
    # ARPHRD_PHONET_PIPE* = 821
    # ARPHRD_CAIF* = 822
    # ARPHRD_IP6GRE* = 823
    # ARPHRD_NETLINK* = 824
    # ARPHRD_6LOWPAN* = 825
    # ARPHRD_VOID* = 0xFFFF
    # ARPHRD_NONE* = 0xFFFE

  type
    Sockaddr_nl* = object
      family*: cushort
      pad*: cushort
      pid*: uint32
      groups*: uint32

    NlMsgHeader* = object
      nlmsg_len*: uint32
      nlmsg_type*: uint16
      nlmsg_flags*: uint16
      nlmsg_seq*: uint32
      nlmsg_pid*: uint32

    IfInfoMessage* = object
      ifi_family*: byte
      ifi_pad*: byte
      ifi_type*: cushort
      ifi_index*: cint
      ifi_flags*: cuint
      ifi_change*: cuint

    IfAddrMessage* = object
      ifa_family*: byte
      ifa_prefixlen*: byte
      ifa_flags*: byte
      ifa_scope*: byte
      ifa_index*: uint32

    RtMessage* = object
      rtm_family*: byte
      rtm_dst_len*: byte
      rtm_src_len*: byte
      rtm_tos*: byte
      rtm_table*: byte
      rtm_protocol*: byte
      rtm_scope*: byte
      rtm_type*: byte
      rtm_flags*: cuint

    RtAttr* = object
      rta_len*: cushort
      rta_type*: cushort

    RtGenMsg* = object
      rtgen_family*: byte

    NLReq* = object
      hdr*: NlMsgHeader
      msg*: RtGenMsg

    NLRouteReq* = object
      hdr*: NlMsgHeader
      msg*: RtMessage