ldattach

LDATTACH(8)                  System Administration                 LDATTACH(8)

NAME
       ldattach - attach a line discipline to a serial line

SYNOPSIS
       ldattach [-1278denoVh] [-i iflag] [-s speed] ldisc device

DESCRIPTION
       The ldattach daemon opens the specified device file (which should refer
       to a serial device) and attaches the line discipline ldisc  to  it  for
       processing  of  the  sent  and/or received data.  It then goes into the
       background keeping the device open so that the  line  discipline  stays
       loaded.

       The line discipline ldisc may be specified either by name or by number.

       In order to detach the line discipline, kill(1) the ldattach process.

       With no arguments, ldattach prints usage information.

LINE DISCIPLINES
       Depending  on  the  kernel  release, the following line disciplines are
       supported:

       TTY(0) The default line  discipline,  providing  transparent  operation
              (raw  mode)  as well as the habitual terminal line editing capa-
              bilities (cooked mode).

       SLIP(1)
              Serial Line IP (SLIP) protocol processor for transmitting TCP/IP
              packets over serial lines.

       MOUSE(2)
              Device  driver  for  RS232  connected  pointing  devices (serial
              mice).

       PPP(3) Point to Point Protocol (PPP) processor for transmitting network
              packets over serial lines.

       STRIP(4)

       AX25(5)

       X25(6) Line  driver for transmitting X.25 packets over asynchronous se-
              rial lines.

       6PACK(7)

       R3964(9)
              Driver for Simatic R3964 module.

       IRDA(11)
              Linux  IrDa  (infrared   data   transmission)   driver   -   see
              http://irda.sourceforge.net/

       HDLC(13)
              Synchronous HDLC driver.

       SYNC_PPP(14)
              Synchronous PPP driver.

       HCI(15)
              Bluetooth HCI UART driver.

       GIGASET_M101(16)
              Driver for Siemens Gigaset M101 serial DECT adapter.

       PPS(18)
              Driver for serial line Pulse Per Second (PPS) source.

       GSM0710(21)
              Driver for GSM 07.10 multiplexing protocol modem (CMUX).

OPTIONS
       -1, --onestopbit
              Set the number of stop bits of the serial line to one.

       -2, --twostopbits
              Set the number of stop bits of the serial line to two.

       -7, --sevenbits
              Set the character size of the serial line to 7 bits.

       -8, --eightbits
              Set the character size of the serial line to 8 bits.

       -d, --debug
              Keep ldattach in the foreground so that it can be interrupted or
              debugged, and to print verbose messages about  its  progress  to
              standard error output.

       -e, --evenparity
              Set the parity of the serial line to even.

       -i, --iflag [-]value...
              Set  the  specified bits in the c_iflag word of the serial line.
              The given value may be a number or a symbolic name.  If value is
              prefixed  by  a  minus  sign, the specified bits are cleared in-
              stead.  Several comma-separated values may be given in order  to
              set and clear multiple bits.

       -n, --noparity
              Set the parity of the serial line to none.

       -o, --oddparity
              Set the parity of the serial line to odd.

       -s, --speed value
              Set  the  speed (the baud rate) of the serial line to the speci-
              fied value.

       -c, --intro-command string
              Define an intro command that is sent through the serial line be-
              fore  the  invocation of ldattach. E.g. in conjunction with line
              discipline GSM0710, the command 'AT+CMUX=0\r' is commonly  suit-
              able to switch the modem into the CMUX mode.

       -p, --pause value
              Sleep  for  value seconds before the invocation of ldattach. De-
              fault is one second.

       -V, --version
              Display version information and exit.

       -h, --help
              Display help text and exit.

SEE ALSO
       inputattach(1), ttys(4)

AUTHOR
       Tilman Schmidt (tilman@imap.cc)

AVAILABILITY
       The ldattach command is part of the util-linux package and is available
       from https://www.kernel.org/pub/linux/utils/util-linux/.

util-linux                         July 2014                       LDATTACH(8)