pkg syscall (darwin-arm64), const EAUTH Errno
pkg syscall (darwin-arm64), const EBADARCH = 86
pkg syscall (darwin-arm64), const EBADARCH Errno
pkg syscall (darwin-arm64), const EBADEXEC = 85
pkg syscall (darwin-arm64), const EBADEXEC Errno
pkg syscall (darwin-arm64), const EBADF = 9
pkg syscall (darwin-arm64), const EBADMACHO = 88
pkg syscall (darwin-arm64), const EBADMACHO Errno
pkg syscall (darwin-arm64), const EBADMSG = 94

pkg syscall (netbsd-arm64-cgo), const EPROCLIM Errno
pkg syscall (netbsd-arm64-cgo), const EPROCUNAVAIL = 76
pkg syscall (netbsd-arm64-cgo), const EPROCUNAVAIL Errno
pkg syscall (netbsd-arm64-cgo), const EPROGMISMATCH = 75
pkg syscall (netbsd-arm64-cgo), const EPROGMISMATCH Errno
pkg syscall (netbsd-arm64-cgo), const EPROGUNAVAIL = 74
pkg syscall (netbsd-arm64-cgo), const EPROGUNAVAIL Errno
pkg syscall (netbsd-arm64-cgo), const EPROTO = 96

	POLLOUT  = 0x4
	POLLERR  = 0x8
	POLLHUP  = 0x10
	POLLNVAL = 0x20
)

type sigset_argpack struct {
	ss    *Sigset_t
	ssLen uintptr
}

type SignalfdSiginfo struct {
	Signo     uint32
	Errno     int32
	Code      int32
	Pid       uint32
	Uid       uint32
	Fd        int32
	Tid       uint32
	Band      uint32
	Overrun   uint32
	Trapno    uint32
	Status    int32
	Int       int32

func (sc *http2serverConn) logf(format string, args ...interface{}) {
	if lg := sc.hs.ErrorLog; lg != nil {
		lg.Printf(format, args...)
	} else {
		log.Printf(format, args...)
	}
}

// errno returns v's underlying uintptr, else 0.
//
// TODO: remove this helper function once http2 can use build
// tags. See comment in isClosedConnError.
func http2errno(v error) uintptr {