ldattach - attach a line discipline to a serial line
ldattach [-1278denoVh] [-i iflag]
[-s speed] ldisc device
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.
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).
- -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.
- -V, --version
- Display version information and exit.
- -h, --help
- Display help text and exit.
Tilman Schmidt (tilman@imap.cc)
The ldattach command is part of the util-linux package and is
available from https://www.kernel.org/pub/linux/utils/util-linux/.