getty.tproj/getty.8

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  32 .\"     from: @(#)getty.8       8.1 (Berkeley) 6/4/93
  33 .\" $FreeBSD: src/libexec/getty/getty.8,v 1.16 2005/01/18 09:29:39 ru Exp $
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  35 .Dd June 4, 1993
  36 .Dt GETTY 8
  37 .Os
  38 .Sh NAME
  39 .Nm getty
  40 .Nd set terminal mode
  41 .Sh SYNOPSIS
  42 .Nm
  43 .Oo
  44 .Ar type
  45 .Op Ar tty
  46 .Oc
  47 .Sh DESCRIPTION
  48 The
  49 .Nm
  50 utility is called by
  51 .Xr launchd 8
  52 to open and initialize the tty line, read a login name, and invoke
  53 .Xr login 1 .
  54 .Pp
  55 The argument
  56 .Ar tty
  57 is the special device file in
  58 .Pa /dev
  59 to open for the terminal (for example, ``ttyh0'').
  60 If there is no argument or the argument is
  61 .Sq Fl ,
  62 the tty line is assumed to be open as file descriptor 0.
  63 .Pp
  64 The
  65 .Ar type
  66 argument can be used to make
  67 .Nm
  68 treat the terminal line specially.
  69 This argument is used as an index into the
  70 .Xr gettytab 5
  71 database, to determine the characteristics of the line.
  72 If there is no argument, or there is no such table, the
  73 .Em default
  74 table is used.
  75 If there is no
  76 .Pa /etc/gettytab
  77 a set of system defaults is used.
  78 If indicated by the table located,
  79 .Nm
  80 will clear the terminal screen,
  81 print a banner heading,
  82 and prompt for a login name.
  83 Usually either the banner or the login prompt will include
  84 the system hostname.
  85 .Pp
  86 Most of the default actions of
  87 .Nm
  88 can be circumvented, or modified, by a suitable
  89 .Pa gettytab
  90 table.
  91 .Pp
  92 The
  93 .Nm
  94 utility can be set to timeout after some interval,
  95 which will cause dial up lines to hang up
  96 if the login name is not entered reasonably quickly.
  97 .Sh FILES
  98 .Bl -tag -width /etc/gettytab -compact
  99 .It Pa /etc/gettytab
 100 .It Pa /etc/ttys
 101 .El
 102 .Sh DIAGNOSTICS
 103 .Bl -diag
 104 .It "ttyxx: No such device or address."
 105 .It "ttyxx: No such file or address."
 106 .Pp
 107 A terminal which is turned
 108 on in the
 109 .Pa ttys
 110 file cannot be opened, likely because the requisite
 111 lines are either not configured into the system, the associated device
 112 was not attached during boot-time system configuration,
 113 or the special file in
 114 .Pa /dev
 115 does not exist.
 116 .El
 117 .Sh SEE ALSO
 118 .Xr login 1 ,
 119 .Xr ioctl 2 ,
 120 .Xr tty 4 ,
 121 .Xr gettytab 5 ,
 122 .Xr ttys 5 ,
 123 .Xr launchd 8
 124 .Sh HISTORY
 125 A
 126 .Nm
 127 utility appeared in
 128 .At v6 .