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 capabilities
	      (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 serial 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 stan-
	      dard 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 instead.  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 specified value.

       -c, --intro-command string
	      Define an intro command that is sent through the serial line before the invocation of ldattach. E.g. in conjunction with line disci-
	      pline GSM0710, the command 'AT+CMUX=0
' is commonly suitable to switch the modem into the CMUX mode.

       -p, --pause value
	      Sleep for value seconds before the invocation of ldattach. Default 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)