MirOS Manual: gettytab(5)

GETTYTAB(5)                  BSD Reference Manual                  GETTYTAB(5)

NAME

     gettytab - terminal configuration database

SYNOPSIS

     gettytab

DESCRIPTION

     The gettytab file is a simplified version of the termcap(5) database used
     to describe terminal lines. The initial terminal login process getty(8)
     accesses the gettytab file each time it starts, allowing simpler reconfi-
     guration of terminal characteristics. Each entry in the database is used
     to describe one class of terminals.

     There is a default terminal class, default, that is used to set global
     defaults for all other classes. (That is, the default entry is read, then
     the entry for the class required is used to override particular set-
     tings.)

CAPABILITIES

     Refer to termcap(5) for a description of the file layout. The default
     column below lists defaults obtained if there is no entry in the table
     obtained, nor one in the special default table.

     Name      Type      Default   Description
     ap        bool      false     Terminal uses any parity.
     bk        str       0377      Alternative end-of-line character (input
                                   break).
     c0        num       unused    TTY control flags to write messages.
     c1        num       unused    TTY control flags to read login name.
     c2        num       unused    TTY control flags to leave terminal as.
     ce        bool      false     Use CRT erase algorithm.
     ck        bool      false     Use CRT kill algorithm.
     cl        str       NULL      Screen clear sequence.
     co        bool      false     Console; add '\n' after login prompt.
     ds        str       '^Y'      Delayed suspend character.
     dx        bool      false     Set DECCTLQ.
     ec        bool      false     Leave echo OFF.
     ep        bool      false     Terminal uses even parity.
     er        str       '^?'      Erase character.
     et        str       '^D'      End of text (EOF) character.
     ev        str       NULL      Initial environment.
     f0        num       unused    TTY mode flags to write messages.
     f1        num       unused    TTY mode flags to read login name.
     f2        num       unused    TTY mode flags to leave terminal as.
     fl        str       '^O'      Output flush character.
     hc        bool      false     Do not hangup line on last close.
     he        str       NULL      Hostname editing string.
     hn        str       hostname  Hostname.
     ht        bool      false     Terminal has real tabs.
     i0        num       unused    TTY input flags to write messages.
     i1        num       unused    TTY input flags to read login name.
     i2        num       unused    TTY input flags to leave terminal as.
     ig        bool      false     Ignore garbage characters in login name.
     im        str       NULL      Initial (banner) message.
     in        str       '^C'      Interrupt character.
     is        num       unused    Input speed.
     kl        str       '^U'      Kill character.
     l0        num       unused    TTY local flags to write messages.
     l1        num       unused    TTY local flags to read login name.
     l2        num       unused    TTY local flags to leave terminal as.
     lc        bool      false     Terminal has lower case.
     lm        str       login:    Login prompt.
     ln        str       '^V'      ``Literal next'' character.
     lo        str       /usr/bin/login Program to execute when name obtained.
     mb        bool      false     Do flow control based on carrier.
     nl        bool      false     Terminal has (or might have) a newline
                                   character.
     np        bool      false     Terminal uses no parity (i.e., 8-bit
                                   characters).
     nx        str       default   Next table (for auto speed selection).
     o0        num       unused    TTY output flags to write messages.
     o1        num       unused    TTY output flags to read login name.
     o2        num       unused    TTY output flags to leave terminal as.
     op        bool      false     Terminal uses odd parity.
     os        num       unused    Output speed.
     pc        str       '\0'      Pad character.
     pe        bool      false     Use printer (hard copy) erase algorithm.
     pf        num       0         Delay between first prompt and following
                                   flush (seconds).
     pp        str       unused    PPP authentication program.
     ps        bool      false     Line connected to a MICOM port selector.
     qu        str       '^\'      Quit character.
     rp        str       '^R'      Line retype character.
     rw        bool      false     Do not use raw for input, use cbreak.
     sp        num       unused    Line speed (input and output).
     su        str       '^Z'      Suspend character.
     tc        str       none      Table continuation.
     to        num       0         Timeout (seconds).
     tt        str       NULL      Terminal type (for environment).
     ub        bool      false     Do unbuffered output (of prompts etc).
     we        str       '^W'      Word erase character.
     xc        bool      false     Do not echo control characters as '^X'.
     xf        str       '^S'      XOFF (stop output) character.
     xn        str       '^Q'      XON (start output) character.

     The following capabilities are no longer supported by getty(8):

     bd        num       0         Backspace delay.
     cb        bool      false     Use CRT backspace mode.
     cd        num       0         Carriage-return delay.
     fd        num       0         Form-feed (vertical motion) delay.
     nd        num       0         Newline (line-feed) delay.
     uc        bool      false     Terminal is known upper case only.

     If no line speed is specified, speed will not be altered from that which
     prevails when getty(8) is entered. Specifying an input or output speed
     will override line speed for stated direction only.

     Terminal modes to be used for the output of the message and for input of
     the login name, and to leave the terminal set as upon completion, are
     derived from the boolean flags specified. If the derivation should prove
     inadequate, any (or all) of these three may be overridden with one of the
     c0, c1, c2, i0, i1, i2, l0, l1, l2, o0, o1, or o2 numeric specifications,
     which can be used to specify (usually in octal, with a leading '0') the
     exact values of the flags. These flags correspond to the termios c_cflag,
     c_iflag, c_lflag, and c_oflag fields, respectively. Each of these sets
     must be completely specified to be effective. The f0, f1, and f2 are ex-
     cepted for backwards compatibility with a previous incarnation of the TTY
     sub-system. In these flags the bottom 16 bits of the (32 bits) value con-
     tain the sgttyb sg_flags field, while the top 16 bits represent the local
     mode word.

     Should getty(8) receive a null character (presumed to indicate a line
     break) it will restart using the table indicated by the nx entry. If
     there is none, it will re-use its original table.

     Delays are specified in milliseconds; the nearest possible delay avail-
     able in the TTY driver will be used. Should greater certainty be desired,
     delays with values 0, 1, 2, and 3 are interpreted as choosing that par-
     ticular delay algorithm from the driver.

     The cl screen clear string may be preceded by a (decimal) number of mil-
     liseconds of delay required (a la termcap(5)). This delay is simulated by
     repeated use of the pad character pc.

     The initial message and login message (im and lm) may include any of the
     following character sequences, which expand to information about the en-
     vironment in which getty(8) is running:

     %d    The current date.

     %h    The hostname of the machine, which is normally obtained from the
           system using gethostname(3), but may also be overridden by the hn
           table entry. In either case it may be edited with the he string. A
           '@' in the he string causes one character from the real hostname to
           be copied to the final hostname. A '#' in the he string causes the
           next character of the real hostname to be skipped. Each character
           that is neither '@' nor '#' is copied into the final hostname.
           Surplus '@' and '#' characters are ignored.

     %t    The TTY name.

     %m, %r, %s, %v
           The type of machine, release of the operating system, name of the
           operating system, and version of the kernel, respectively, as re-
           turned by uname(3).

     %%    A '%' character.

     When getty(8) executes the login process given in the lo string (usually
     /usr/bin/login), it will have set the environment to include the terminal
     type, as indicated by the tt string (if it exists). The ev string can be
     used to enter additional data into the environment. It is a list of
     comma-separated strings, each of which will presumably be of the form
     name=value.

     If a non-zero timeout is specified with to, then getty(8) will exit
     within the indicated number of seconds, either having received a login
     name and passed control to login(1), or having received an alarm signal
     and exited. This may be useful to hangup dial in lines.

     Output from getty(8) is even parity unless op or np is specified. The op
     string may be specified with ap to allow any parity on input, but gen-
     erate odd parity output. Note: this only applies while getty(8) is being
     run; terminal driver limitations prevent a more complete implementation.
     getty(8) does not check parity of input characters in RAW mode.

     If a pp string is specified and a PPP link bring-up sequence is recog-
     nized, getty(8) will invoke the program referenced by the pp option. This
     can be used to handle incoming PPP calls.

SEE ALSO

     login(1), gethostname(3), uname(3), termcap(5), getty(8)

HISTORY

     The gettytab file format appeared in 4.2BSD.

BUGS

     The special characters (erase, kill, etc.) are reset to system defaults
     by login(1). In all cases, '#' or '^H' typed in a login name will be
     treated as an erase character, and '@' will be treated as a kill charac-
     ter.

     The delay stuff is a real crock. Apart from its general lack of flexibil-
     ity, some of the delay algorithms are not implemented. The terminal
     driver should support sane delay settings.

     The he capability is stupid.

     The termcap(5) format is horrid; something more rational should have been
     chosen.

MirOS BSD #10-current           April 19, 1994                               3

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