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ttys                       File Format                       ttys




Describe terminal ports


The  file  /eettcc/ttttyyss  describes  the  terminals in  the  COHERENT
system.  The  process iinniitt reads this file when  it brings up the
system in multi-user mode.

/eettcc/ttttyyss  contains  one  line  for  each  terminal.   Each  line
consists of the following four fields:

11.   The first field is  one character long, and indicates if the
     device is enabled  for logins: `0' indicates that the device
     is  not enabled,  and `1'  (one)  indicates that  logins are
     enabled for the device.

22.   The  second  field  is  one  character long,  and  indicates
     whether  the device  is local (i.e.,  a terminal)  or remote
     (i.e., a  modem): `r' indicates remote,  and `l' (lower-case
     LL)  indicates  local.  If  `r'  is used  and  a password  is
     included  for rreemmaacccc  (remote access)  in  /eettcc/ppaasssswwdd, then
     persons logging in on this device will be required to supply
     the  remote-access  password.  (See  the  Lexicon entry  for
     ppaasssswwdd for more about rreemmaacccc).

33.   The third  field is  one character  long, and sets  the baud
     rate for  the device.  Note that a device  can have either a
     fixed  baud rate,  or a variable  baud rate.   The following
     table gives the codes for fixed baud rates:

     CC       110
     GG       300
     II       1200
     LL       2400
     NN       4800
     PP       9600
     QQ       19200

     The  common  variable-speed  codes  terminal  types  are  as
     follows:

     00       300, 1200, 150, 110
     33       2400, 1200, 300

     When a  user dials into a variable-speed  line, a message is
     sent to  the terminal using the first  speed listed.  If the
     message is unintelligible, the user hits the <bbrreeaakk> key and
     the  system  tries the  next  speed; and  so  on, until  the
     correct speed is selected.

44.   The fourth field names  the port that this device is plugged
     into.   The following  table names  the ports  that COHERENT
     recognizes:

     ccoonnssoollee   The tube and keyboard on your computer


COHERENT Lexicon                                           Page 1




ttys                       File Format                       ttys



     ccoomm11ll     Serial port ccoomm11, local device
     ccoomm11rr     Serial port ccoomm11, remote device
     ccoomm11ppll    Serial port ccoomm11, local device
     ccoomm11pprr    Serial port ccoomm11, remote device
     ccoomm22ll     Serial port ccoomm22, local device
     ccoomm22rr     Serial port ccoomm22, remote device
     ccoomm22ppll    Serial port ccoomm22, local device
     ccoomm22pprr    Serial port ccoomm22, remote device
     ccoomm33ll     Serial port ccoomm33, local device
     ccoomm33rr     Serial port ccoomm33, remote device
     ccoomm33ppll    Serial port ccoomm33, local device
     ccoomm33pprr    Serial port ccoomm33, remote device
     ccoomm44ll     Serial port ccoomm44, local device
     ccoomm44rr     Serial port ccoomm44, remote device
     ccoomm44ppll    Serial port ccoomm44, local device
     ccoomm44pprr    Serial port ccoomm44, remote device

     Note that  if field 2 (described above) says  that this is a
     local device, then you  must use a port descriptor that ends
     in `l';  likewise, if field  2 states that this  is a remote
     device,  the  port   descriptor  must  end  in  `r'.   Doing
     otherwise will result in trouble.  See Lexicon entry ccoomm for
     further details.

Do not leave trailing spaces at the end of an entry in /eettcc/ttttyyss.
Leaving blanks  at the  end of a  line usually results  in errors
that state that a device could not  be found.

After  you have  edited /eettcc/ttttyyss,  the following  command forces
COHERENT to re-read the file and use the new descriptions:


          kill quit 1


***** Examples *****

Consider the following ttttyyss entry:


          1lPconsole


Field 1  is the first  character.  Here it  is set to  `1' (one),
which indicates  that the device is enabled  for logins.  Field 2
is the  second character.  Here it is set  to `l' (lower-case LL),
which  indicates that  this is  a local device.   Field 3  is the
third character.   Here, it is  set to `P',  which indicates that
the device  operates at the  fixed baud rate of  9600 baud.  This
field is  ignored by the console device  driver since the console
is not a serial device.  Finally, field 4 is the remainder of the
line.   Here, it  indicates that  the device  in question  is the
console.




COHERENT Lexicon                                           Page 2




ttys                       File Format                       ttys



Now, consider another example:


          1r3com3r


Field 1  is the first  character.  Here it  is set to  `1' (one),
which indicates  that the device is enabled  for logins.  Field 2
is the second character.  Here  it is set to `r', which indicates
that this  is a  remote device,  i.e., a modem.   Field 3  is the
third character.   Here, it is  set to `3',  which indicates that
the device  operates at  variable baud  rates of 2400,  1200, and
300.  By  hitting the <bbrreeaakk>  key on the terminal,  the user can
select  from  among  those  three  baud  rates,  in  that  order.
Finally,  field  4  is  the  remainder  of the  line.   Here,  it
indicates that the device  in question is plugged into port ccoomm33,
and is accessed via special file /ddeevv/ccoomm33rr.

***** Files *****

/eettcc/ttttyyss

***** See Also *****

ccoomm, ffiillee ffoorrmmaattss, ggeettttyy, iinniitt, llooggiinn, ssttttyy, tteerrmmiinnaall, ttttyy
































COHERENT Lexicon                                           Page 3

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