Visit Our UNIX and Linux User Community

Linux and UNIX Man Pages

Test Your Knowledge in Computers #864
Difficulty: Medium
In 2019, the UserCP was rewritten in Vue.js by Neo.
True or False?
Linux & Unix Commands - Search Man Pages

tb(4) [bsd man page]

TB(4)							     Kernel Interfaces Manual							     TB(4)

tb - line discipline for digitizing devices SYNOPSIS
/sys/conf/SYSTEM: NTB 1 # RS232 interface for Genisco/Hitachi tablets DESCRIPTION
This line discipline provides a polled interface to many common digitizing devices which are connected to a host through a serial line. When these devices stream data at high speed, the use of the line discipline is critical in minimizing the number of samples that would otherwise be lost due to buffer exhaustion in the tty(4) handler. The line discipline is enabled by a sequence: #include <sys/tablet.h> int ldisc = TBLDISC, fildes; ... ioctl(fildes, TIOCSETD, &ldisc); A typical application program then polls the digitizing device by reading a binary data structure which contains: the current X and Y posi- tions (in the device coordinate space), up-down status of the buttons or pen stylus, proximity information (when available), and a count of the number of samples received from the input device since it was opened. In addition, devices such as the GTCO append tilt and pressure information to the end of the aforementioned structure. For the Polhemus 3-D digitizer the structure read is completely different. Refer to the include file for a complete description. While in tablet mode, normal teletype input and output functions take place. Thus, if an 8 bit output data path is desired, it is neces- sary to prepare the output line by putting it into RAW mode using ioctl(2). This must be done before changing the discipline with TIOC- SETD, as most ioctl(2) calls are disabled while in tablet line-discipline mode. The line discipline supports ioctl(2) requests to get/set the operating mode, and to get/set the tablet type and operating mode by or-ing the two values together. The line discipline supports digitizing devices which are compatible with Hitachi, GTCO, or Polhemus protocol formats. For Hitachi there are several formats with that used in the newer model HDG-1111B the most common. SEE ALSO
None. 3rd Berkeley Distribution August 1, 1987 TB(4)

Check Out this Related Man Page

LDATTACH(8)						     Linux Programmer's Manual						       LDATTACH(8)

ldattach - attach a line discipline to a serial line SYNOPSIS
ldattach [-dhV78neo12] [-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 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. OPTIONS
-d | --debug Causes ldattach to stay in the foreground so that it can be interrupted or debugged, and to print verbose messages about its progress to the standard error output. -h | --help Prints a usage message and exits. -V | --version Prints the program version. -s value | --speed value Set the speed of the serial line to the specified value. -7 | --sevenbits Sets the character size of the serial line to 7 bits. -8 | --eightbits Sets the character size of the serial line to 8 bits. -n | --noparity Sets the parity of the serial line to none. -e | --evenparity Sets the parity of the serial line to even. -o | --oddparity Sets the parity of the serial line to odd. -1 | --onestopbit Sets the number of stop bits of the serial line to one. -2 | --twostopbits Sets the number of stop bits of the serial line to two. SEE ALSO
inputattach(1), ttys(4) AUTHOR
Tilman Schmidt ( AVAILABILITY
The ldattach command is part of the util-linux-ng package and is available from Linux 2.6 14 January 2008 LDATTACH(8)

Featured Tech Videos