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 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 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 discipline GSM0710, the command 'AT+CMUX=0\r'
           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.

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

       -V, --version
           Print version and exit.

AUTHORS

       Tilman Schmidt <tilman@imap.cc>

SEE ALSO

       inputattach(1), ttys(4)

REPORTING BUGS

       For bug reports, use the issue tracker at https://github.com/util-linux/util-linux/issues.

AVAILABILITY

       The ldattach command is part of the util-linux package which can be downloaded from Linux
       Kernel Archive <https://www.kernel.org/pub/linux/utils/util-linux/>.