b := make([]byte, n)
	n = 0
	for i, s := range ss {
		bb[i] = &b[n]
		copy(b[n:], s)
		n += len(s) + 1
	}
	return bb, nil
}

func CloseOnExec(fd int) { fcntl(fd, F_SETFD, FD_CLOEXEC) }

func SetNonblock(fd int, nonblocking bool) (err error) {
	flag, err := fcntl(fd, F_GETFL, 0)
	if err != nil {
		return err
	}
	if (flag&O_NONBLOCK != 0) == nonblocking {
		return nil
	}

	EPOLLWRBAND              = 0x0008
	EPOLLPRI                 = 0x0010
	EPOLLERR                 = 0x0020
	EPOLLHUP                 = 0x0040
	EPOLLEXCLUSIVE           = 0x20000000
	EPOLLONESHOT             = 0x40000000
	FD_CLOEXEC               = 0x01
	FD_CLOFORK               = 0x02
	FD_SETSIZE               = 0x800
	FNDELAY                  = 0x04
	F_CLOSFD                 = 9
	F_CONTROL_CVT            = 13
	F_DUPFD                  = 0

	EMPTY_SET                     = 0x0
	EMT_CPCOVF                    = 0x1
	EQUALITY_CHECK                = 0x0
	EXTA                          = 0xe
	EXTB                          = 0xf
	FD_CLOEXEC                    = 0x1
	FD_NFDBITS                    = 0x40
	FD_SETSIZE                    = 0x10000
	FLUSHALL                      = 0x1
	FLUSHDATA                     = 0x0
	FLUSHO                        = 0x2000

	FAN_RESPONSE_INFO_AUDIT_RULE                = 0x1
	FAN_RESPONSE_INFO_NONE                      = 0x0
	FAN_UNLIMITED_MARKS                         = 0x20
	FAN_UNLIMITED_QUEUE                         = 0x10
	FD_CLOEXEC                                  = 0x1
	FD_SETSIZE                                  = 0x400
	FF0                                         = 0x0
	FIB_RULE_DEV_DETACHED                       = 0x8

	err = socketpair(domain, typ, proto, &fdx)
	if err == nil {
		fd[0] = int(fdx[0])
		fd[1] = int(fdx[1])
	}
	return
}

var ioSync int64

func CloseOnExec(fd int) { fcntl(fd, F_SETFD, FD_CLOEXEC) }

func SetNonblock(fd int, nonblocking bool) (err error) {
	flag, err := fcntl(fd, F_GETFL, 0)
	if err != nil {
		return err
	}
	if nonblocking {
		flag |= O_NONBLOCK
	} else {

		{"EpollWait", Func, 0},
		{"Errno", Type, 0},
		{"EscapeArg", Func, 0},
		{"Exchangedata", Func, 0},
		{"Exec", Func, 0},
		{"Exit", Func, 0},
		{"ExitProcess", Func, 0},
		{"FD_CLOEXEC", Const, 0},
		{"FD_SETSIZE", Const, 0},
		{"FILE_ACTION_ADDED", Const, 0},
		{"FILE_ACTION_MODIFIED", Const, 0},
		{"FILE_ACTION_REMOVED", Const, 0},
		{"FILE_ACTION_RENAMED_NEW_NAME", Const, 0},