Module posix.termio
Control Terminal I/O.
Functions and constants for controlling terminal behaviour.
Functions
| tcdrain (fd) | Wait for all written output to reach the terminal. | 
| tcflow (fd, action) | Suspend transmission or receipt of data. | 
| tcflush (fd, action) | Discard any data already written but not yet sent to the terminal. | 
| tcgetattr (fd) | Get termios state. | 
| tcsendbreak (fd, duration) | Send a stream of zero valued bits. | 
| tcsetattr (fd, actions, a) | Set termios state. | 
Tables
| ccs | Control characters. | 
| termios | Terminal attributes. | 
Functions
- tcdrain (fd)
- 
    Wait for all written output to reach the terminal.
    Parameters:- fd int terminal descriptor to act on
 Returns:- 
           int
        
 0, if successfulOr- nil
- string error message
- int errnum
 See also:
- tcflow (fd, action)
- 
    Suspend transmission or receipt of data.
    Parameters:- fd int terminal descriptor to act on
- action
            int
         one of TCOOFF,TCOON,TCIOFForTCION
 Returns:- 
           int
        
 0, if successfulOr- nil
- string error message
- int errnum
 See also:
- tcflush (fd, action)
- 
    Discard any data already written but not yet sent to the terminal.
    Parameters:- fd int terminal descriptor to act on
- action
            int
         one of TCIFLUSH,TCOFLUSH,TCIOFLUSH
 Returns:- 
           int
        
 0, if successfulOr- nil
- string error message
- int errnum
 See also:
- tcgetattr (fd)
- 
    Get termios state.
    Parameters:- fd int terminal descriptor
 Returns:- 
        error message if failed
    
 Or- 
           termios
        terminal attributes, if successful
    
 Or- nil
- string error message
- int errnum
 See also:Usage:local termios, errmsg = tcgetattr (fd)
- tcsendbreak (fd, duration)
- 
    Send a stream of zero valued bits.
    Parameters:- fd int terminal descriptor
- duration int if non-zero, stream for some implementation defined time
 Returns:- 0 if successful, otherwise nil
- error message if failed
 See also:
- tcsetattr (fd, actions, a)
- 
    Set termios state.
    Parameters:- fd int terminal descriptor to act on
- actions
            int
         bitwise OR of one or more of TCSANOW,TCSADRAIN,TCSAFLUSHandTSASOFT
- a
            termios
         table with fields from iflag, oflag, cflag, lflag and cc,
 each formed by boroperations with various posix constants
 Returns:- 0 if successful, otherwise nil
- error message if failed
 See also:Usage:ok, errmsg = tcsetattr (fd, 0, { cc = { [P.VTIME] = 0, [P.VMIN] = 1 }) 
Tables
- ccs
- 
    Control characters.
The field names below are not strings, but index constants each
referring to a terminal control character.
    Fields:- VINTR int interrupt control character
- VQUIT int quit control character
- WERASE int erase control character
- VKILL int kill control character
- VEOF int end-of-file control character
- VEOL int end-of-line control charactor
- VEOL2 int another end-of-line control charactor
- VMIN int 1
- VTIME int 0
- VSTART int xon/xoff start control character
- VSTOP int xon/xoff stop control character
- VSUSP int suspend control character
 
- termios
- 
    Terminal attributes.
The constants named below are all available in this submodule's namespace,
as long as they are supported by the underlying system.
    Fields:- cc ccs array of terminal control characters
- cflag
            int
         bitwise OR of zero or more of
  CSIZE,CS5,CS6,CS7,CS8,CSTOPB,CREAD,PARENB,PARODD,HUPCL,CLOCALandCRTSCTS
- iflag
            int
         input flags; bitwise OR of zero or more of IGNBRK,BRKINT,IGNPAR,PARMRK,INPCK,ISTRIP,INLCR,IGNCR,ICRNL,IXON,IXOFF,IXANY,IMAXBELandIUTF8
- lflags
            int
         local flags; bitwise OR of zero or more of ISIG,ICANON,ECHO,ECHOE,ECHOK', 'ECHONL,NOFLSH,IEXTENandTOSTOP
- oflag
            int
         output flags; bitwise OR of zero or more of OPOST,ONLCR,OXTABS,ONOEOT,OCRNL,ONOCR,ONLRET,OFILL,NLDLY,TABDLY,CRDLY,FFDLY,BSDLY,VTDLYandOFDEL
- ispeed
            int
         the input baud rate, one of B0,B50,B75,B110,B134,B150,B200,B300,B600,B1200,B1800,B2400,B4800,B9600,B19200,B38400,B57600,B115200,
- ospeed int the output baud rate (see ispeed for possible values)