AAMANDV:    0x070C5 << 15, // amand.d
	AAMORW:     0x070C6 << 15, // amor.w
	AAMORV:     0x070C7 << 15, // amor.d
	AAMXORW:    0x070C8 << 15, // amxor.w
	AAMXORV:    0x070C9 << 15, // amxor.d
	AAMMAXW:    0x070CA << 15, // ammax.w
	AAMMAXV:    0x070CB << 15, // ammax.d
	AAMMINW:    0x070CC << 15, // ammin.w
	AAMMINV:    0x070CD << 15, // ammin.d
	AAMMAXWU:   0x070CE << 15, // ammax.wu

const (
	// flags inside DNSRecord.Dw
	DnsSectionQuestion   = 0x0000
	DnsSectionAnswer     = 0x0001
	DnsSectionAuthority  = 0x0002
	DnsSectionAdditional = 0x0003
)

const (
	// flags of WSALookupService
	LUP_DEEP                = 0x0001
	LUP_CONTAINERS          = 0x0002
	LUP_NOCONTAINERS        = 0x0004
	LUP_NEAREST             = 0x0008
	LUP_RETURN_NAME         = 0x0010

	EPOLL_CLOEXEC            = 0x00001000
	EPOLL_CTL_ADD            = 0
	EPOLL_CTL_MOD            = 1
	EPOLL_CTL_DEL            = 2
	EPOLLRDNORM              = 0x0001
	EPOLLRDBAND              = 0x0002
	EPOLLIN                  = 0x0003
	EPOLLOUT                 = 0x0004
	EPOLLWRBAND              = 0x0008
	EPOLLPRI                 = 0x0010
	EPOLLERR                 = 0x0020
	EPOLLHUP                 = 0x0040

}

// pollfd represents the poll structure for AIX operating system.
type pollfd struct {
	fd      int32
	events  int16
	revents int16
}

const _POLLIN = 0x0001
const _POLLOUT = 0x0002
const _POLLHUP = 0x2000
const _POLLERR = 0x4000

var (
	pfds           []pollfd
	pds            []*pollDesc
	mtxpoll        mutex
	mtxset         mutex
	rdwake         int32
	wrwake         int32

var SupportedAEADs = map[uint16]struct {
	keySize   int
	nonceSize int
	aead      func([]byte) (cipher.AEAD, error)
}{
	// RFC 9180, Section 7.3
	0x0001: {keySize: 16, nonceSize: 12, aead: aesGCMNew},
	0x0002: {keySize: 32, nonceSize: 12, aead: aesGCMNew},
	0x0003: {keySize: chacha20poly1305.KeySize, nonceSize: chacha20poly1305.NonceSize, aead: chacha20poly1305.New},
}

var SupportedKDFs = map[uint16]func() *hkdfKDF{

	WSAECONNABORTED           Errno = 10053
	WSAECONNRESET             Errno = 10054
)

const (
	// Invented values to support what package os expects.
	O_RDONLY   = 0x00000
	O_WRONLY   = 0x00001
	O_RDWR     = 0x00002
	O_CREAT    = 0x00040
	O_EXCL     = 0x00080
	O_NOCTTY   = 0x00100
	O_TRUNC    = 0x00200
	O_NONBLOCK = 0x00800
	O_APPEND   = 0x00400
	O_SYNC     = 0x01000
	O_ASYNC    = 0x02000
	O_CLOEXEC  = 0x80000
)

const (
	http2cipher_TLS_NULL_WITH_NULL_NULL               uint16 = 0x0000
	http2cipher_TLS_RSA_WITH_NULL_MD5                 uint16 = 0x0001
	http2cipher_TLS_RSA_WITH_NULL_SHA                 uint16 = 0x0002
	http2cipher_TLS_RSA_EXPORT_WITH_RC4_40_MD5        uint16 = 0x0003
	http2cipher_TLS_RSA_WITH_RC4_128_MD5              uint16 = 0x0004
	http2cipher_TLS_RSA_WITH_RC4_128_SHA              uint16 = 0x0005

const (
	PURGE_TXABORT = 0x0001
	PURGE_RXABORT = 0x0002
	PURGE_TXCLEAR = 0x0004
	PURGE_RXCLEAR = 0x0008
)

// SetCommMask constants. See https://learn.microsoft.com/en-us/windows/win32/api/winbase/nf-winbase-setcommmask.
const (
	EV_RXCHAR  = 0x0001
	EV_RXFLAG  = 0x0002
	EV_TXEMPTY = 0x0004
	EV_CTS     = 0x0008
	EV_DSR     = 0x0010
	EV_RLSD    = 0x0020

		// https://github.com/golang/go/issues/8687#issuecomment-656259353
		_CREATE_WAITABLE_TIMER_HIGH_RESOLUTION = 0x00000002

		_SYNCHRONIZE        = 0x00100000
		_TIMER_QUERY_STATE  = 0x0001
		_TIMER_MODIFY_STATE = 0x0002
	)
	return stdcall4(_CreateWaitableTimerExW, 0, 0,
		_CREATE_WAITABLE_TIMER_HIGH_RESOLUTION,
		_SYNCHRONIZE|_TIMER_QUERY_STATE|_TIMER_MODIFY_STATE)
}

func initHighResTimer() {
	h := createHighResTimer()

// DT_FLAGS values.
type DynFlag int

const (
	DF_ORIGIN DynFlag = 0x0001 /* Indicates that the object being loaded may
	   make reference to the
	   $ORIGIN substitution string */
	DF_SYMBOLIC DynFlag = 0x0002 /* Indicates "symbolic" linking. */
	DF_TEXTREL  DynFlag = 0x0004 /* Indicates there may be relocations in non-writable segments. */
	DF_BIND_NOW DynFlag = 0x0008 /* Indicates that the dynamic linker should