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Copyright 2008 Tilman Schmidt (tilman@imap.cc)
May be distributed under the GNU General Public License version 2 or later
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= ldattach(8)
:doctype: manpage
:man manual: System Administration
:man source: util-linux {release-version}
:page-layout: base
:command: ldattach

== NAME

ldattach - attach a line discipline to a serial line

== SYNOPSIS

*ldattach* [*-1278denoVh*] [*-i* _iflag_] [*-s* _speed_] [*-m* _mtu_] _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.

*-m*, *--mtu* _value_::
Set maximum frame size for GSM0710 CMUX. If not specified, traditionally the default of 127 have been set by *ldattach*. This differs from 3GPP TS 27.010 default value of 31 bytes, so it is recommended to specify

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== AUTHORS

mailto:tilman@imap.cc[Tilman Schmidt]

== SEE ALSO

*inputattach*(1),
*ttys*(4)

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