C-KERMIT CONFIGURATION INFORMATION                                   -*-text-*-

  As of C-Kermit version:  7.0.196
  This file last updated:  Sat Jan  1 13:33:53 2000

  Frank da Cruz, Columbia University

  Copyright (C) 1985, 2000,
    Trustees of Columbia University in the City of New York.
    All rights reserved.  See the C-Kermit COPYING.TXT file or the
    copyright text in the ckcmai.c module for disclaimer and permissions.


DOCUMENTATION

  Frank da Cruz and Christine M. Gianone, "Using C-Kermit", Second Edition,
  1997, Digital Press / Butterworth-Heinemann, Woburn, MA, ISBN 1-55558-164-1
  US single-copy price: $44.95; quantity discounts available.  Available in
  computer bookstores or directly from Columbia University:

    The Kermit Project
    Columbia University
    612 West 115th Street
    New York NY  10025-7799  USA
    Telephone: +1 (212) 854-3703
    Email: kermit-orders@columbia.edu
    Web: http://www.columbia.edu/kermit/

  The CKERMIT2.TXT file contains supplementary info for C-Kermit 7.0 to be
  used until the 3rd edition of the manual is ready.


WHAT IS IN THIS FILE

This file is for C-Kermit developers.  It explains compilation options,
feature selection, and compilation problem-solving, as they (should) apply to
all versions of C-Kermit: UNIX, VMS, OS/2, and the rest.

CONTENTS

  0. OVERVIEW
  1. FILE TRANSFER
  2. SERIAL COMMUNICATION SPEEDS
  3. FULLSCREEN FILE TRANSFER DISPLAY
  4. CHARACTER SETS
  5. APC EXECUTION
  6. PROGRAM SIZE
     6.1. When Memory Is Not a Problem
     6.2. Removing Features
     6.3. Changing Buffer Sizes
     6.4. Other Size-Related Items
     6.5. Space/Time Tradeoffs
  7. DIALER SUPPORT
  8. NETWORK SUPPORT
     8.1. TCP/IP
	  8.1.1. Firewalls
	  8.1.2. Solving Compilation and Linking Problems
	  8.1.3. Enabling Host Address Lists
	  8.1.4. Enabling Telnet NAWS
          8.1.5. Enabling Incoming TCP/IP Connections
     8.2. X.25
     8.3. Other Networks
  9. EXCEPTION HANDLING
 10. SECURITY FEATURES
 11. ENABLING SELECT()
 12. I/O REDIRECTION
 13. FLOATING-POINT TIMERS
 14. SPECIAL CONFIGURATIONS
 APPENDIX I: SUMMARY OF COMPILE-TIME OPTIONS


0. OVERVIEW

This file gives more-or-less system-independent configuration information for
C-Kermit 5A and later.  The major topics covered include program size (and how
to reduce it), how to include or exclude particular features, notes on modem
and network support, and a list of C-Kermit's compile-time options.

For details about your particular operating system, consult the system-specific
installation instructions file:

  CK?INS.TXT

(? = U for UNIX, V for VMS, etc, for example, CKUINS.TXT for UNIX, CKVINS.TXT
for VAX/VMS, CKDINS.TXT for Data General AOS/VS, etc).  Also consult the
following files (use lowercase on UNIX):

  CKAAAA.TXT   Explanation of file naming conventions
  CKCPLM.TXT   C-Kermit "program logic manual"
  CK?KER.HLP   System-specific help file, if any
  CK?KER.MAK   System-specific build procedure
  CKCBWR.TXT   "Beware file": C-Kermit bugs, limitations, workarounds
  CK?BWR.TXT   System-specific "beware file"
  CKERMIT2.TXT User-level documentation for new features since "Using
               C-Kermit", 2nd Edition, was published.
  CKCnnn.TXT   Program edit history for edit nnn, e.g. CKC195.TXT.


1. FILE TRANSFER

Prior to version 7.0, C-Kermit was always built with the most conservative
Kermit file-transfer protocol defaults on every platform: no control-character
prefixing, 94-byte packets, and a window size of 1.

Starting in version 7.0, fast settings are the default for UNIX and VMS.  To
override these at compile time, include:

  -DNOFAST

in the C compiler CFLAGS.  Even with the fast defaults, it will drop down to
whatever window and packet sizes requested by the other Kermit, if these are
smaller, when sending files (except for control-character unprefixing, which
is not negotiated, and which is now set to CAUTIOUS rather than NONE at
startup).  C-Kermit's settings prevail when it is receiving.  To build with
fast defaults for other platforms, add:

  -DCK_FAST

to CFLAGS.


2. SERIAL COMMUNICATION SPEEDS

As of 6 September 1997, a new simplified mechanism for obtaining the list
of legal serial interface speeds is in place:

 . If the symbol TTSPDLIST is defined, the system-dependent routine
   ttspdlist() is called at program initialization to obtain the list.

 . This symbol should be defined only for C-Kermit implementations that
   have implemented the ttspdlist() function, typically in the ck?tio.c
   module.  See ckutio.c for an example.

 . TTSPDLIST is automatically defined in ckcdeb.h for UNIX.  Add the
   appropriate #ifdefs for other platforms when the corresponding
   ttspdlist() functions are filled in.

 . If TTSPDLIST is (or normally would be) defined, the old code (described
   below) can still be selected by defining NOTTSPDLIST.

The ttspdlist() function can obtain the speeds in any way that works.  For
example, based simply on #ifdef Bnnnn..#endif (in UNIX).  Although it might be
better to actually check each speed against the currently selected hardware
interface before allowing it in the array, there is usually no passive and/or
reliable and safe way to do this, and so it's better to let some speeds into
the array that might not work, than it is to erroneously exclude others.
Speeds that don't work are caught when the SET SPEED command is actually given.

Note that this scheme does not necessarily rule out split speed operation,
but effectively it does in C-Kermit as presently constituted since there are
no commands to set input and output speed separately (except the special
case "set speed 75/1200").

Note that some platforms, notably AIX 4.2 and 4.3, implement high serial
speeds transparently to the application, e.g. by mapping 50 bps to 57600 bps,
and so on.  See (e.g.) ckubwr.txt for examples.

That's the whole deal.  When TTSPDLIST is *not* defined, the following applies:

Speeds are defined in two places: the SET SPEED keyword list in the command
parser (as of this writing, in the ckuus3.c source file), and in the system-
dependent communications i/o module, CK?TIO.C, functions ttsspd() (set speed)
and ttgspd() (get speed).  The following speeds are assumed to be available
in all versions:

  0, 110, 300, 600, 1200, 2400, 4800, 9600

If one or more of these speeds is not supported by your system, you'll need
to change the source code (this has never happened so far).  Other speeds
that are not common to all systems have Kermit-specific symbols:

               Symbol       Symbol
  Speed (bps)  to enable    to disable
       50       BPS_50       NOB_50
       75       BPS_75       NOB_75
       75/1200  BPS_7512     NOB_7512
      134.5     BPS_134      NOB_134
      150       BPS_150      NOB_150
      200       BPS_200      NOB_200
     1800       BPS_1800     NOB_1800
     3600       BPS_3600     NOB_3600
     7200       BPS_7200     NOB_7200
    14400       BPS_14K      NOB_14K
    19200       BPS_19K      NOB_19K
    28800       BPS_28K      NOB_28K
    38400       BPS_38K      NOB_38K
    57600       BPS_57K      NOB_57K
    76800       BPS_76K      NOB_76K
   115200       BPS_115K     NOB_155K
   230400       BPS_230K     NOB_230K
   460800       BPS_460K     NOB_460K
   921600       BPS_921K     NOB_921K

and maybe some others...

The ckcdeb.h header file contains default speed configurations for the many
systems that C-Kermit supports.  You can override these defaults by (a)
editing ckcdeb.h, or (b) defining the appropriate enabling and/or disabling
symbols on the CC command line, for example:

  -DBPS_14400 -DNOB_115200

or the "make" command line, e.g.:

  make blah "KFLAGS=-DBPS_14400 -DNOB_115200"

Note: some speeds have no symbols defined for them, because they have never
been needed: 12.5bps, 45.5bps, 20000bps, etc.  These can easily be added if
required (but they will work only if the OS supports them).

IMPORTANT: Adding one of these flags at compile time does not necessarily mean
that you will be able to use that speed.  A particular speed is usable only if
your underlying operating system supports it.  In particular, it needs to be
defined in the appropriate system header file (e.g. in UNIX, cd to
/usr/include and grep for B9600 in *.h and sys/*.h to find the header file
that contains the definitions for the supported speeds), and supported by the
serial device driver, and of course by the physical device itself.

ALSO IMPORTANT: The list of available speeds is independent of how they are
set.  The many UNIXes, for example, offer a wide variety of APIs that are
BSD-based, SYSV-based, POSIX-based, and purely made up.  See the ttsspd(),
ttgspd(), and ttspdlist() routines for illustrations.

The latest entries in this horserace are the tcgetspeed() and ttsetspeed()
routines found in UnixWare 7.  Unlike other methods, they accept the entire
range of integers (longs really) as speed values, rather than certain codes,
and return an error if the number is not, in fact, a legal speed for the
device/driver in question.  In this case, there is no way to build a list of
legal speeds at compile time, since no Bnnnn symbols are defined (except for
"depracated, legacy" interfaces like ioctl()) and so the legal speed list must
be enumerated in the code -- see ttspdlist() in ckutio.c.


3. FULLSCREEN FILE TRANSFER DISPLAY

New to edit 180 is support for an MS-DOS-Kermit-like local-mode full screen
file transfer display, accomplished using the curses library, or something
equivalent (for example, the Screen Manager on DEC VMS).  To enable this
feature, include the following in your CFLAGS:

  -DCK_CURSES

and then change your build procedure (if necessary) to include the necessary
libraries, usually "curses", perhaps also "termcap" or "termlib":

  "LIBS= -lcurses -ltermcap"
  "LIBS= -lcurses -ltermlib"
  "LIBS= -lcurses"
  "LIBS= -ltermlib"

to pull in the required libraries.  "man curses" for further information, and
search through the makefile for "CK_CURSES" to see many examples.

Plus maybe you'll have to replace "curses" above by "ncurses".

There might still be a complication.  Some implementations of curses reserve
the right to alter the buffering on the output file without restoring it
afterwards, which can leave Kermit's command processing in a mess when the
prompt comes back after a fullscreen file transfer display.  The typical
symptom is that characters you type at the prompt after a file transfer do not
echo until you press the Return (Enter) key.  If this happens to you, try
adding

  -DCK_NEWTERM

to your makefile entry (see comments in screenc() in ckuusx.c for an
explanation).

In SCO Xenix and SCO UNIX, there are two separate curses libraries, one based
on termcap and the other based on terminfo.  The default library, usually
terminfo, is established when the development system is installed.  To
manually select terminfo (at compile time):

  compile -DM_TERMINFO and link -ltinfo

and to manually select termcap:

  compile -DM_TERMCAP and link -ltcap -ltermlib

<curses.h> looks at M_TERMINFO and M_TERMCAP to decide which header files to
use.  /usr/lib/libcurses.a is a link to either libtinfo.a or libtcap.a.  The
C-Kermit compilation options must agree with the version of the curses library
that is actually installed.

NOTE: If you are doing an ANSI-C compilation and you get compile time warnings
like the following:

  Warning: function not declared in ckuusx.c: wmove, printw, wclrtoeol,
  wclear, wrefresh, endwin, etc...

it means that your <curses.h> file does not contain prototypes for these
functions.  The warnings should be harmless.

New to edit 190 is the ability to refresh a messed-up full-screen display,
e.g. after receiving a broadcast message.  This depends on the curses package
including the wrefresh() and clearok() functions and the curscr variable.  If
your version has these, or has code to simulate them, then add:

  -DCK_WREFRESH

The curses and termcap libraries add considerable size to the program image
(e.g. about 20K on a SUN-4, 40K on a 386).  On some small systems, such as the
AT&T 6300 PLUS, curses support can push Kermit over the edge... even though it
compiles, loads, and runs correctly, its increased size apparently makes it
swap constantly, slowing it down to a crawl, even when the curses display is
not in use.  Some new makefile entries have been added to take care of this
(e.g. sys3upcshcc), but similar tricks might be necessary in other cases too.

Also new to edit 190 is an ASCII-graphic percent-done "thermometer".  This is
not included unless you add:

  -DCK_PCT_BAR

to your CFLAGS.

Just below the bar is a running display of the transfer rate, as a flat
quotient of file characters per elapsed seconds so far.  You can change this
to an average that gives greater weight to recent history (0.25 *
instantaneous cps + 0.75 * historical cps) by adding -DCPS_WEIGHTED to
your CFLAGS (sorry folks, this one is not worth a SET command).  You can
choose a second type of weighted average in which the weighting smooths
out progressively as the transfer progresses by adding -DCPS_VINCE to
-DCPS_WEIGHTED.

An alternative to curses is also available at compile time, but should be
selected if your version of Kermit is to be run in local mode only in an ANSI
terminal environment, for example on a desktop workstation that has an ANSI
console driver.  To select this option in place of curses, define the symbol
MYCURSES:

  -DMYCURSES

instead of CK_CURSES.  The MYCURSES option uses built-in ANSI (VT100) escape
sequences, and depends upon your terminal or console driver to interpret them
correctly.

In some C-Kermit builds, we replace printf() via #define printf...  However,
this can cause conflicts with the [n]curses header files.  Various hacks are
required to get around this -- see ckutio.c, ckuusx.c, ckufio.c, ckucmd.c,
etc.

To use the fullscreen display feature, SET FILE DISPLAY FULLSCREEN.  Beware, it
can slow the transfer down a bit (or a lot).  The faster the connection speed,
the more likely the fullscreen display will become the bottleneck.  To test
whether the fullscreen display is slowing your transfers down on a particular
connection, transfer the same with it and without it, and compare the figures
given in the STATISTICS command.  The default file transfer display is still
the old SERIAL ("dots") display, even if you build in curses support.

A compromise between the two styles (new to edit 183), that can be used on any
video display terminal, can be elected at runtime with the SET FILE DISPLAY
CRT.  It relies only on the ability of the terminal to write over the current
line when it receives a bare carriage return.  The same performance comments
apply to this display option.


4. CHARACTER SETS

By default, C-Kermit is built with support for translation of character sets
for Western European languages (i.e. languages that originated in Western
Europe, but are now also spoken in the Western Hemisphere and other parts of
the world), via ISO 8859-1 Latin Alphabet 1, for Eastern European languages
(ISO Latin-2), Hebrew (and Yiddish), and Cyrillic-alphabet languages (ISO
Latin/Cyrillic).  Many file (local) character sets are supported: ISO 646
7-bit national sets, IBM code pages, Apple, DEC, DG, NeXT, etc.

To build Kermit with no character-set translation at all, include -DNOCSETS in
the CFLAGS.  To build with no Latin-2, add -DNOLATIN2.  To build with no
Cyrillic, add -DNOCYRIL.  To omit Hebrew, add -DNOHEBREW.  If -DNOCSETS is
*not* included, you'll always get LATIN1.  To build with no KANJI include
-DNOKANJI.  There is presently no way to include Latin-2, Cyrillic, Hebrew, or
Kanji without also including Latin-1.

Unicode support was added in version 7.0, and it adds a fair amount of tables
and code (and this is only a "Level 1" implementation -- a higher level would
also require building in the entire Unicode database).  On a PC with RH 5.2
Linux, building C-Kermit 7.0 Beta 11:

  NOCSETS NOUNICODE NOKANJI   Before    After
   [   ]    [   ]    [   ]    1329014          (Full)
   [   ]    [   ]    [ X ]    1325686          (Unicode but no Kanji)
   [   ]    [ X ]    [   ]    1158837          (All charsets except Unicode)
   [ X ]    [ x ]    [ x ]    1090845          (NOCSETS implies the other two)

Note, by the way, that NOKANJI without NOUNICODE only removes the non-Unicode
Kanji sets (Shift-JIS, EUC-JP, JIS-7, etc).  Kanji is still representable in
UCS-2 and UTF-8.


5. APC EXECUTION

The Kermit CONNECT module can be coded to execute Application Program Command
escape sequences from the host:

  <ESC>_<text><ESC>\

where <text> is a C-Kermit command, or a list of C-Kermit commands separated
by commas, up to about 1K in length.

To date, this feature has been coded into the OS/2, Windows, VMS, OS-9, and
UNIX versions, for which the symbol:

  CK_APC

is defined automatically in ckuusr.h.  For OS/2, APC is enabled at runtime
by default, for UNIX it is disabled.  It is controlled by the SET TERMINAL
APC command.  Configuring APC capability into a version that gets it by
default (because CK_APC is defined in ckuusr.h) can be overridden by including:

  -DNOAPC

on the CC command line.

The autodownload feature depends on the APC feature, so deconfiguring APC
also disables autodownload.


6. PROGRAM SIZE

(Also see Section 4: Character Sets)

C-Kermit has become a large program, much larger than early versions because
of all the new features, primarily the script programming language, sliding
window packet protocol, and international character set translation.  On some
systems, the size of the program prevents it from being successfully linked
and loaded.  On some others, it occupies so much memory that it is constantly
swapping or paging.  In such cases, you can reduce C-Kermit's size in various
ways, outlined in this section.  The following options can cut down on the
program's size at compile time by removing features or changing the size of
storage areas.

6.1. When Memory Is Not a Problem

But first, also note that if "memory is no problem" on your system, you can
easily INCREASE the sizes of many things (buffers, command length, macro
length, maximum number of all sorts of things) simply by defining the
following symbol at compile time:

  BIGBUFOK

This symbol is defined for certain platforms by default in ckcdeb.h.  If you
want to override this, use:

  make xxxx KFLAGS=-DNOBIGBUF

6.2. Removing Features

Features can be removed by defining symbols on the CC (C compiler) command
line.  "-D" is the normal CC directive to define a symbol so, for example,
"-DNODEBUG" defines the symbol NODEBUG.  Some C compilers might use different
syntax, e.g.  "-d NODEBUG" or "/DEFINE=NODEBUG".  For C compilers that do not
take command-line arguments, you can put the corresponding #define statements
in the file CKCSYM.H, for example:

#define NODEBUG

(The #define statement must be on the left margin.)  Here are C-Kermit's
size-related compile-time options.  The ones that take up the most space are
marked by asterisk (*).  If you are desperate to save space, remove debugging
first, rather than some more useful feature.  Remove built-in help only if
absolutely necessary.  The final resort is to remove the interactive command
parser completely, leaving only a UNIX-style command-line interface
("kermit -s foo").  This cuts the program down to about 25% of its fully
configured size.

* -DNOUNICODE:Add this option to omit Unicode character-set support.
* -DNODEBUG:  Add this option to omit all debugging code.
  -DNOTLOG:   Add this option to omit transaction logging.
* -DNOHELP:   Add this option to omit built-in help.
  -DNODISPLAY:Add this option to omit the file-transfer display.
  -DTCPSOCKET:Remove this option to omit TCP/IP support.
  -DSUNX25:   Remove this option to omit SunLink X.25 support.
* -DNONET:    Add this to remove all network support.
  -DNOMSEND:  Add this option to remove the MSEND command.
* -DNOLOCAL:  Add this option to remove all support for making connections.
* -DNODIAL:   Add this option to remove the DIAL command and modem support.
* -DMINIDIAL: Add this option to support only standard &/or generic modem types
* -DNOOLDMODEMS: Add this option to drop support for "old" modem types.
* -DNOCHANNELIO: Add this option to remove the FILE command & related functions
  -DNOXMIT:   Add this option to remove the TRANSMIT command.
  -DNOSCRIPT: Add this option to remove the UUCP-style SCRIPT command.
  -DNOCMDL:   Add this option to remove the command-line option interface.
* -DNOSPL:    Add this option to remove the script programming language.
* -DNOICP:    Add this option to remove the entire interactive command parser.
  -DNOIKSD:   Remove support for the Internet Kermit Service Daemon.
  -DDCMDBUF:  Add this option to allocate command buffers dynamically.
* -DNOCSETS:  Add this option to remove international character set support.
  -DNOLATIN2  Add this option to remove ISO Latin-2 character-set translation.
  -DNOCYRIL:  Add this option to remove Cyrillic character set translation.
  -DNOLATIN2: Add this option to remove Latin-2 character set translation.
  -DNOHEBREW: Add this option to remove Hebrew character set translation.
  -DKANJI:    Omit this option to exclude Kanji character set translation.
  -DNOESCSEQ: Add this option to omit ANSI escape sequence recognition.
  -DNOSERVER: Add this option to remove server mode.
  -DNOSETKEY: Add this option to remove the SET KEY command.
  -DNOPUSH:   Add this option to remove escapes to operating system.
  -DNOFRILLS: Add this option to remove "frills".
* -DNOCURSES: Omit this option to keep the curses library out of Kermit.
* -DNOBIGBUF: Override BIGBUFOK in case it is defined: force smaller buffers.
* -DNOXFER:   Add this option to omit all file-transfer protocols.

  -DSBSIZ=nnnn -DRBSIZ=nnnnn
     Change the overall size of the packet send and receive buffers.

-DNOFRILLS removes various command synonyms; the following top-level commands:
CLEAR, DELETE, DISABLE, ENABLE, GETOK, MAIL, RENAME, TYPE, WHO; and the
following REMOTE commands: KERMIT, LOGIN, LOGOUT, PRINT, TYPE, WHO.

The CK_CURSES option, at least on UNIX, requires C-Kermit be linked with a
large external library (curses or ncurses).  On certain small systems,
C-Kermit programs built this way have been observed to cause swapping and/or
performance problems.  If you include -DNOCURSES, you might also have to edit
the makefile entry to remove all references to "curses", "termcap", and/or
"termlib", etc, from the LIBS clause.

6.3. Changing Buffer Sizes

(This section is somewhat obsolete -- most modern C-Kermit versions are built
with BIGBUFOK defined, which selects maximum-size packet buffers, plus big
command and other buffers).

There are options to control Kermit's packet buffer allocations.  The
following symbols are defined in ckcker.h in such a way that you can override
them by redefining them in CFLAGS:

  -DMAXSP=xxxx - Maximum send-packet length, default 2048.
  -DMAXRP=xxxx - Maximum receive-packet length, 2048 for UNIX, 1920 for VMS.
  -DSBSIZ=xxxx - Total allocation for send-packet buffers, default 3008.
  -DRBSIZ=xxxx - Total allocation for receive-packet buffers, default 3008.

The program size is affected by SBSIZ and RBSIZ (send and receive packet
buffer size).  These are static character arrays compiled into the program.
If you wish, you can have Kermit allocate packet buffers dynamically at
runtime using malloc() by including the CFLAGS switch:

  -DDYNAMIC

In this case, the default packet and buffers sizes are changed to:

  -DMAXSP=9024 (for UNIX, 2048 for VMS)
  -DMAXRP=9024 (for UNIX, 1920 for VMS)
  -DSBSIZ=9050
  -DRBSIZ=9050

but you can change the packet buffer sizes (not the maximum packet size) at
runtime using the command:

  SET BUFFERS <sbsiz> <rbsiz>

Using dynamic allocation (-DDYNAMIC) reduces storage requirements for the
executable program on disk, and allows more and bigger packets at runtime.
But dynamic allocation might not work on all systems.  Try it.  If it works
for you, there is no reason not to use it.  But if the program hangs or core
dumps, then omit the -DDYNAMIC option from CFLAGS.

6.4. Other Size-Related Items

To make Kermit compile and load successfully, you might have to change your
build procedure to:

   a. Request a larger ("large" or "huge") model.  This is particularly true
      for 16-bit PC-based UNIX versions.  This is typically done with a -M
      and/or -F switch (see your cc manual or man page for details).

   b. Some systems support overlays.  If the program is too big to be built
      as is, check your loader manual ("man ld") to see if an overlay feature
      is available.  See the 2.10/2.11 BSD example in the UNIX makefile.

   c. Similarly, some systems support "code mapping", which is similar to
      overlays.  Again, see "man ld".

It is also possible to reduce the size of the executable program file in
several other ways:

   a. Include the -O (optimize) compiler switch if it isn't already included
      in your "make" entry (and if it works!).  If your compiler supports
      higher levels of optimization (e.g. -O2), try them.

   b. If your UNIX system supports shared libraries, change the make entry to
      take advantage of this feature.  The way to do this depends on your
      particular system.  Some (like SunOS) do it automatically.  See the NeXT
      entry for an example.

   c. Strip the program image after building ("man strip" for further info),
      or add -s to the LNKFLAGS (UNIX only).  This strips the program of its
      symbol table and relocation information.

   d. Move character strings into a separate file.  See the 2.10 BSD entry
      for an example.

6.5. Space/Time Tradeoffs

There are over 2000 debug() statements in the program.  If you want to save
both space (program size) and time (program execution time), include -DNODEBUG
in the compilation.  If you want to include debugging for tracking down
problems, omit -DNODEBUG from the make entry.  But when you include debugging,
you have two choices for how it's done.  One definition defines debug() to be
a function call; this is cheap in space but expensive in execution.  The other
defines debug as "if (deblog)" and then the function call, to omit the
function call overhead when the debug log is not active.  But this adds a lot
of space to the program.  Both methods work, take your choice; IFDEBUG is
preferred if memory is not a constraint but the computer is likely to be slow.
The first method is the default, i.e. if nothing is done to the CFLAGS or in
ckcdeb.h (but in some cases, e.g. VMS, it is).  To select the second method,
include -DIFDEBUG in the compilation (and don't include -DNODEBUG).


7. DIALER SUPPORT

-DNODIAL removes automatic modem dialing completely, including the entire
ckudia.c module, plus all commands that refer to dialing in the various
ckuus*.c modules.

-DMINIDIAL leaves the DIAL and related commands (SET/SHOW MODEM, SET/SHOW
DIAL) intact, but removes support for all types of modems except CCITT, Hayes,
Unknown, User-defined, Generic-high-speed, and None (= Direct).  The MINIDIAL
option cuts the size of the dial module approximately in half.  Use this
option if you have only Hayes or CCITT modems and don't want to carry the
baggage for the other types.

A compromise between full dialer support and MINIDIAL is obtained by removing
support for "old" modems -- all the strange non-Hayes compatible 1200 and 2400
bps modems that C-Kermit has been carrying around code for since 1985 or so.
To remove support for these modems, add -DNOOLDMODEMS to CFLAGS at compilation
time.

Finally, if you keep support for old modems, you will notice that their names
appear on the "set modem ?" menu.  That's because their names are, by default,
"visible".  But the list is confusing to the younger generation, who have only
heard of modems from the V.32bis-and-later era.  If you want to be able to
use old modems, but don't want their names cluttering up menus, add this to
CFLAGS:

  -DM_OLD=1

8. NETWORK SUPPORT

C-Kermit supports not only RS-232 serial connections, direct and modem, but
also TCP/IP and X.25 network connections.  The OS/2 version supports DECnet
(LAT) connections.  If you define the following symbol:

  NONET

then all network support will be compiled away.

8.1. TCP/IP

TCP/IP support requires the Berkeley sockets library, and is generally
available on any UNIX system.  It is also available in OS/2, VMS, AOS/VS, VOS,
etc.  The TCP/IP support includes built-in TELNET negotiation handling.  To
select TCP/IP support, include -DTCPSOCKET in your makefile entry's CFLAGS, or
the appropriate variant (e.g. -DWOLLONGONG, -DMULTINET, -DEXCELAN, -DWINTCP,
etc).

Reportedly, even some of these are not consistent within themselves.  For
example, Wollongong reportedly puts header files in different directories for
different UNIX versions:

  in.h can be in either /usr/include/sys or /user/include/netinet.
  telnet.h can be in either /usr/include/arpa or /user/include/netinet.
  inet.h can be in either /usr/include/arpa or /user/include/sys.

In cases like this, use the -I cc command-line option when possible; otherwise
it's better to make links in the file system than it is to hack up the
C-Kermit source code.  Suppose, for example, Kermit is looking for telnet.h in
/usr/include/arpa, but on your system it is in /usr/include/netinet.  Do this
(as root, or get the system manager to do it):

  cd /usr/include/arpa
  ln /usr/include/netinet/telnet.h telnet.h

("man ln" for details about links.)

The network support for TCP/IP and X.25 is in the source files CKCNET.H and
CKCNET.C, with miscellaneous SHOW commands, etc, in the various CKUUS*.C
modules, plus code in the CK*CON.C (CONNECT command) and several other modules
to detect TELNET negotiations, etc.

Within the TCPSOCKET code, some socket-level controls are included if
TCPSOCKET is defined in the C-Kermit CFLAGS and SOL_SOCKET is defined in
in the system's TCP-related header files, such as <sys/socket.h>.  These are

  SET TCP KEEPALIVE
  SET TCP LINGER
  SET TCP RECVBUF
  SET TCP SENDBUF

In addition, if TCP_NODELAY is defined, the following command is also
enabled:

  SET TCP NODELAY (Nagle algorithm)

See the user documentation for descriptions of these commands.

8.1.1. Firewalls

There exist various types of firewalls, set up allow separate users of an
internal TCP/IP network from the great wide Internet.  Of course, this could
be accomplished most easily and safely by simply not connecting the internal
network to the Internet, but in many cases some restricted forms of access are
needed.  Thus a "firewall" is set up to allow only authorized accesses.

One firewall method is called SOCKS, in which a proxy server allows users
inside a firewall to access the outside world, based on a permission list
generally stored in a file.  SOCKS is enabled in one of two ways.  First, the
standard sockets library is modified to handle the firewall, and then all the
client applications are relinked (in systems where linking is not dynamic)
with the modified sockets library.  The APIs are all the same, so the
applications do not need to be recoded or recompiled.

In the other method, the applications must be modified to call replacement
routines, such as Raccept() instead of accept(), Rbind() instead of bind(),
etc, and then linked with a separate SOCKS library.  This second method is
accomplished in C-Kermit by including -DCK_SOCKS in your CFLAGS, and also
adding:

  -lsocks

to LIBS, or replacing -lsockets with -lsocks (depending on whether the socks
library also includes all the sockets entry points).

For SOCKS5, use -DCK_SOCKS5.

Explicit firewall support can, in general, not be a standard feature or a
feature that is selected at runtime, because the SOCKS library tends to be
different at each site -- local modifications abound.

The ideal situation occurs when firewalls are supported by the first method,
using dynamically linked sockets-replacement libraries; in this case, all your
TCP/IP client applications will negotiate the firewall transparently.

8.1.2. Solving Compilation and Linking Problems

The main() routine is in ckcmai.c.  If you get complaints about "main: return
type is not blah", define MAINTYPE on the CC command line, e.g.

  make xxx "KFLAGS=-DMAINTYPE=blah" (where "blah" is int, long, or whatever).

If the complaint is "Attempt to return a value from a function of type void"
then add -DMAINISVOID:

  make xxx "KFLAGS=-DMAINISVOID"

If you get a compilation error in CKCNET.C, with a complaint like
"incompatible types in assignment", it probably has something to do with the
data type your system uses for the inet_addr() function, which is declared
(usually) in <arpa/inet.h>.  Kermit uses "unsigned long" unless the symbol
INADDRX is defined, in which case "struct inaddr" is used instead.  Try adding
-DINADDRX to CFLAGS in your make entry, and if that fixes the problem, please
send a report to kermit@columbia.edu.

Compilation errors might also have to do with the data type used for
getsockopt() and setsockopt() option-length field.  This is normally an int,
but sometimes it's a short, a long, or an unsigned any of those, or a size_t.
To fix the compilation problem, add -DSOCKOPT_T=xxx to the CFLAGS in your
makefile entry, where xxx is the appropriate type (use "man getsockopt" or
grep through your system/network header files to find the needed type).

8.1.3. Enabling Host Address Lists

When you give Kermit an IP host name, it calls the socket routine
gethostbyname() to resolve it.  gethostbyname() returns a hostent struct,
which might or might not not include a list of addresses; if it does, then
if the first one fails, Kermit can try the second one, and so on.  However,
this will only work if the symbol "h_addr" is a macro defined as
"h_addr_list[0]", usually in netdb.h.  If it is, then you can activate this
feature by defining the following symbol in CFLAGS:

  HADDRLIST

8.1.4. Enabling Telnet NAWS

TELNET Negotiation About Window Size (NAWS) support requires the ability to
find out the terminal screen's dimensions.  E.g. in UNIX, we need something
like ioctl(0, TIOCGWINSZ, ...).  If your version of Kermit was built with NAWS
capability, SHOW VERSIONS will include CK_NAWS among the compiler options.  If
it doesn't, you can add it by defining CK_NAWS at compile time.  Then, if the
compiler or linker complain about undefined or missing symbols, or there is no
complaint but SHOW TERMINAL fails to show reasonable "Rows =, Columns ="
values, then take a look at (or write) the appropriate ttgwsiz() routine.  On
the other hand, if CK_NAWS is defined by default for your system (in ckcnet.h),
but causes trouble, you can override this definition by including the -DNONAWS
switch on your CC command line, thus disabling the NAWS feature.

This appears to be needed at least on the AT&T 3B2, where in ckutio.c,
the routine ttgwsiz() finds that the TIOCGWINSZ symbol is defined but lacks
definitions for the corresponding winsize struct and its members ws_col
and ws_row.

The UNIX version of C-Kermit also traps SIGWINCH, so it can send a NAWS any
time the console terminal window size changes, e.g. when you stretch it with a
mouse.  The SIGWINCH-trapping code is enabled if SIGWINCH is defined (i.e. in
signal.h).  If this code should cause problems, you can disable it without
disabling the NAWS feature altogether, by defining NOSIGWINCH at compile time.

8.1.5. Enabling Incoming TCP/IP Connections

This feature lets you "set host * <port>" and wait for an incoming connection
on the given port.  This feature is enabled automatically at compile if
TCPSOCKET is defined and SELECT is also defined.  But watch out, simply
defining SELECT on the cc command line does not guarantee successful
compilation or linking (see section 11).

If you want to disable incoming TCP/IP connections, then build C-Kermit
with:

  -DNOLISTEN

8.1.6. Disabling "SET TCP" Options.

The main reason for this is because of header file / prototype conflicts at
compile time regardting get/setsockopt().  If you can't fix them (without
breaking other builds), just include the following in CFLAGS:

  -DNOTCPOPTS


8.2. X.25

X.25 support requires (a) a SUN, (b) the SunLink product (libraries and header
files), and (c) an X.25 connection into your SUN, or else Stratus VOS and the
appropriate X.25 development tools.  Support for IBM AIXlink X.25 was added
in C-Kermit 6.1.

In UNIX, special makefile entries sunos4x25 and sunos41x25 (for SUNOS 4.0 and
4.1, respectively), or aix41x25, are provided to build in this feature, but
they only work if conditions (a)-(c) are met.  To request this feature,
include -DSUNX25 (or -DIBMX25) in CFLAGS.

SUNX25 (or -DIBMX25) and TCPSOCKET can be freely mixed and matched.

8.3. Other Networks

Support for other networking methods -- NETBIOS, LAT, Named Pipes, etc --
is included in CK*NET.H and CK*NET.C for implementations (such as OS/2) where
these methods are supported.

Provision is made in the organization of the modules, header files, commands,
etc, for addition of new network types such as DECnet, X.25 for other systems
(HP-UX, VMS, etc), and so on.  Send email to kermit@columbia.edu if you are
interested in working on such a project.

9. EXCEPTION HANDLING

The setjmp/longjmp mechanism is used for handling exceptions.  The jump
buffer is of type jmp_buf, which almost everywhere is typedef'd as an array,
in which case you should have no trouble compiling the exception-handling
code.  However, if you are building C-Kermit in/for an environment where
jmp_buf is something other than an array (e.g. a struct), then you'll have
to define the following symbol:

  JBNOTARRAY

10. SECURITY FEATURES

Compiling with the NOPUSH symbol defined removes all the "shell escape"
features from the program, including the PUSH, RUN, and SPAWN commands, the
"!"  and "@" command prefixes, OPEN !READ, OPEN !WRITE, job control (including
the SUSPEND command), the REDIRECT command, shell/DCL escape from CONNECT
mode, as well as the server's execution of REMOTE HOST commands (and, of
course, the ENABLE HOST command).  Add NODISPO to also prevent acceptance of
incoming MAIL or REMOTE PRINT files.  For UNIX, also be sure to read
CKUINS.TXT about set[ug]id installation.  Additional restrictions can be
enforced when in server mode; read about the DISABLE command.

Compiling with NOCCTRAP prevents the trapping of SIGINT by Kermit.  Thus
if the user generates a SIGINT signal (e.g. by typing the system's interrupt
character), Kermit will exit immediately, rather than returning to its
prompt.

NOPUSH and NOCCTRAP together allow Kermit to be run from restricted shells,
preventing access to system functions.

11. ENABLING SELECT()

Kermit works best if it can do nonblocking reads, nondestructive input buffer
checking, and millisecond sleeps.  All of these functions can be accomplished
by the select() function, which, unfortunately, is not universally available.
Furthermore, select() is required if incoming TCP/IP connections are to be
supported.

select() was introduced with Berkeley UNIX, rejected by AT&T for System V,
but is gradually creeping in to all UNIX versions (and other operating systems
too) by virtue of its presence in the sockets library, which is needed for
TCP/IP.  AT&T SVID for System V R4 includes select(), but that does not mean
that all SVR4 implementations have it.

Furthermore, even when select() is available, it might work only on socket
file descriptors, but not on others like serial ports, pipes, etc.  For
example, in AOS/VS and BeOS (DR8 and earlier), it works only with file
descriptors that were created by socket() and opened by connect() or accept().

Other alternatives include poll() and rdchk().  Only one of these three
functions should be included.  The following symbols govern this:

  SELECT  Use select() (BSD, or systems with sockets libraries)
  CK_POLL Use poll()   (System V)
  RDCHK   Use rdchk()  (SCO)

If your system supports the select() function, but your version of C-Kermit
does not, try adding:

  -DSELECT

to the CFLAGS, and removing -DRDCHK or -DCK_POLL if it is there.  If you get
compilation errors, some adjustments to ck*tio.c and/or ck*net.c might be
needed; search for SELECT (uppercase) in these files (note that there are
several variations on the calling conventions for select()).

Various macros and data types need to be defined in order to use select().
Usually these are picked up from <types.h> or <sys/types.h>.  But on some
systems, they are in <sys/select.h>.  In that case, add the following:

  -DSELECT_H

to the CFLAGS to tell C-Kermit to #include <sys/select.h>.  A good indication
that you need to do this would be if you get compile-time complaints about
"fd_set" or "FD_SET" not being declared or defined.

In UNIX, the use of select() vs fork() in the CONNECT command is independent
of the above considerations, and is governed by choosing a particular makefile
target.

As of C-Kermit 6.1, select() is also the preferred control mechanism for
the CONNECT command.  Unfortunately, the structures used by the original
UNIX CONNECT command, based on fork(), and those used by select(), are so
different, it was not practical to implement them both in one module.  So the
select()-based CONNECT command module for UNIX is ckucns.c, and the fork-based
one remains ckucon.c.  To choose the fork-based one, which is more portable
(but slower and more fragile), use "wermit" as the make target.  To choose the
select-based one, use "xermit" (as is done, for example, in the SunOS 4.1
make target).  Only do this if you can verify that the CONNECT command works
on serial connections and PIPE connections as well as TCP connections.

  The select() version of ckucon.c MUST be used if encryption is to be
  done, since the fork() version loses its ability to share vital state
  information between the two forks.  Also note that the select() version
  is superior in many other ways too.  For example, it recovers better from
  exterior killing, forced disconnections, etc.

SHOW VERSIONS tells whether the CONNECT module uses fork() or select().


12. I/O REDIRECTION

The REDIRECT command allows a local program to be run with its i/o redirected
over the communications connection.  Your version of C-Kermit has a REDIRECT
command if it was built with the following CFLAG:

  -DCK_REDIR

This, in turn, is possible only if the underlying API is there.  In the case
of UNIX this is just the wait() system call, so all UNIX versions get this
feature as of 6.0.192 (earlier versions needed a <sys/wait.h> header file
defining the symbols WIFEXITED and WEXITSTATUS).

As of version 6.1, file transfer can be done using pipes and filters.  To
enable this feature, #define PIPESEND (and fill in the code).  To disable on
systems where it is normally enabled, define NOPIPESEND.  This feature is, of
course, also disabled by building with NOPUSH (or giving the "nopush" command
at runtime).

Version 6.1 also adds the PIPE and SET HOST /COMMAND commands, which provide
another form of redirection.  This feature is selected with -DNETCMD.  CK_RDIR
must also be defined, since the same mechanisms are used internally.


13. FLOATING-POINT TIMERS

C-Kermit 6.1 can be configured to use high-precision file-transfer timers
for more accurate statistics.  This feature is enabled with:

  -DGFTIMER

and disabled with:

  -DNOGFTIMER

If you try to build with -DGFTIMER but you get compilation errors, either
fix them (and send email to kermit@columbia.edu telling what you did), or
else give up and use -DNOGFTIMER instead.  Hint: depending on your machine
architecture, you might have better luck using double than float as the data
type for floating-point numbers, or vice versa.  Look in ckcdeb.h for the
section that handles this (search for "float").

If it builds successfully, test the result carefully -- watch the time-related
fields in the fullscreen file-transfer display and the numbers reported by the
STATISTICS command.  If the results are nonsense, then try switching from
float to double or vice versa as noted in the previous paragraph.  If that
doesn't help, use -DNOFGTIMER.


14. SPECIAL CONFIGURATIONS

As of C-Kermit 7.0, if you build C-Kermit normally, but with -DNOICP (No
Interactive Command Parser), you get a program capable of making serial
connections (but not dialing) and network connections (if TCPSOCKET or
other network option included), and can also transfer files using Kermit
protocol, but only via autodownload/upload.  Furthermore, if you call
the executable "telnet", it will act like Telnet -- using the command-line
options.  However, in this case there is nothing to escape back to, so if
you type Ctrl-\c, it just prints a message to this effect.

You can also build C-Kermit with -DNOXFER, meaning omit all the file-transfer
features.  This leaves you with a scriptable communications program that is
considerably smaller than the full C-Kermit.


----------------------------------------------------------------------
APPENDIX I: SUMMARY OF COMPILE-TIME OPTIONS

These are the symbols that can be specified on the cc command line, listed
alphabetically.  Others are used internally, including those taken from header
files, those defined by the compiler itself, and those inferred from the ones
given below.  Kermit's SHOW VERSIONS command attempts to display most of
these.  See ckcdeb.h and ckcnet.h for inference rules.  For example SVR3
implies ATTSV, MULTINET implies TCPSOCKET, and so on.

The following options are not included in all makefile entries, but they are
beneficial if they work.  It is recommended that you add them to your makefile
entry if they are lacking and test the result.  If it's OK, let me know and
I'll add them to the official makefile:

DYNAMIC        Dynamic packet buffer allocation, bigger packets allowed, etc.
NOSETBUF       Don't do unbuffered single-character writes to the console.
               This tends to speed up CONNECT mode.

Here is the complete list of the Kermit-specific compile-time switches:

ACUCNTRL       Select BSD 4.3-style acucntrl() bidirectional tty control.
aegis          Build for Apollo Aegis (predefined on Apollo systems).
AIX370         Build for IBM AIX/370 for IBM mainframes.
AIXESA         Build for IBM AIX/ESA for IBM mainframes.
AIXPS2         Build for IBM AIX 3.0 for PS/2 series (never formally released).
AIXRS          Build for IBM AIX 3.x on RS/6000.
AIX41          Build for IBM AIX 4.x on RS/6000.
AMIGA          Build for Commodore Amiga with Intuition OS.
ATT6300        Build for AT&T 6300 PLUS.
ATT7300        Build for AT&T 7300 UNIX PC (3B1).
ATTSV          Build for AT&T System III or V UNIX.
AUX            Build for Apple A/UX for the Macintosh.
BIGBUFOK       OK to use big buffers - "memory is not a problem"
BPS_xxxx       Enable SET SPEED xxxx
BSD29          Build for BSD 2.9 or 2.10.
BSD4           Build for BSD 4.2.
BSD41          Build for BSD 4.1.
BSD43          Build for BSD 4.3.
BSD44          Build for BSD 4.4.
C70            Build for BBN C/70.
CIE            Build for CIE Systems 680/20.
CKCONINTB4CB   Work around prompt-disappears after escape back from CONNECT.
CKLOGDIAL      Enable connection log.
CKMAXPATH      Maximum length for a fully qualified filename.
CKREGEX        Include [...] or {xxx,xxx,xxx} matching in ckmatch().
CKSYSLOG       Enable syslogging.
CK_ANSIC       Enable ANSI C constructs - prototypes, etc.
CK_ANSILIBS    Use header files for ANSI C libraries.
CK_APC         Enable APC execution by CONNECT module.
CK_CURSES      Enable fullscreen file transfer display.
CK_DSYSINI     Use system-wide init file, with name supplied by Kermit.
CK_DTRCD       DTR/CD flow control is available.
CK_FAST        Build with fast Kermit protocol defaults.
CK_FORK_SIG    UNIX only: signal() number for CONNECT module forks.
CK_IFRO        IF REMOTE command is available (and can run in remote mode).
CK_INI_A       System-wide init file takes precedence over user's.
CK_INI_B       User's init file takes precedence over the system-wide one.
CK_LABELED     Include support for SET FILE TYPE LABELED.
CK_LBRK        This version can send Long BREAK.
CK_LINGER      Add code to turn of TCP socket "linger" parameter.
CK_MKDIR       This version has a zmkdir() command to create directories.
CK_NAWS        Include TELNET Negotiate About Window Size support.
CK_NEWTERM     Use newterm() rather than initscr() to initialize curses.
CK_PCT_BAR     Fullscreen file transfer display should include "thermometer".
CK_POLL        System-V or POSIX based UNIX has poll() function.
CK_POSIX_SIG   Use POSIX signal handing: sigjmp_buf, sigsetjmp, siglongjmp.
CK_READ0       read(fd,&x,0) can be used to test TCP/IP connections.
CK_REDIR       Enable the REDIRECT command.
CK_RESEND      Include the RESEND command (needs zfseek() + append).
CK_RTSCTS      RTS/CTS flow control is available.
CK_SOCKBUF     Enable TCP socket-buffer-size-increasing code.
CK_SOCKS       UNIX only: Build with socks library rather than regular sockets
CK_SOCKS5      UNIX only: Build with socks 5 lib rather than regular sockets
CK_SPEED       Enable control-character unprefixing.
CK_SYSINI="xxxxx"  Quoted string to be used as system-wide init file name.
CK_TIMERS      Build with support for dynamically calculated packet timeouts.
CK_TMPDIR      This version of Kermit has an isdir() function.
CK_TTYFD       Defined on systems where the communications connection file
               descriptor (ttyfd) can be passed to other processes as a
               command-line argument via \v(ttyfd).
CK_URL         Parse URLs as well as hostnames, etc.
CK_XONXOFF     Xon/Xoff flow control available.
CK_XYZ         Include support for XYZMODEM protocols.
CK_WREFRESH    Curses package includes wrefresh(),clearok() for screen refresh.
CKTYP_H=xxx    Force include of xxx as <types.h> file.
CLSOPN         When hanging up a tty device, also close and reopen it.
CMDDEP         Maximum recursion depth for self-referential user-defined fn's.
COHERENT       Build for Mark Williams Coherent UNIX
CONGSPD        Define if this version has congspd() routine in ck?tio.c
datageneral    Build for Data General AOS/VS or AOS/VS II
DCLPOPEN       popen() is available but needs to be declared
DEC_TCPIP      Build with support for DEC TCP/IP (UCX) for (Open)VMS
DGUX430        Build for DG/UX 4.30
DGUX540        Build for DG/UX 5.40
DEFPAR=x       Default parity, 0, 'e', 'o', 'm', or 's'.
DFTTY=xxx      Default communications device name.
DIRENT         UNIX directory structure to be taken from <dirent.h>
DIRPWDRP       Prompt for password in REMOTE CWD command.
DTILDE         Include UNIX ~ notation for username/home-directory
DYNAMIC        Allocate file transfer packet buffers dynamically with malloc.
ENCORE         Build for Encore Multimax computers.
EXCELAN        Build with excelan TCP/IP.
FT18           Build for Fortune For:Pro 1.8.
FT21           Build for Fortune For:Pro 2.1.
GEMDOS         Build for Atari ST GEMDOS.
GFTIMER        Use high-precision floating-point file-transfer timers.
GID_T=xxx      Group IDs are of type xxx (usually int, short, or gid_t).
HADDRLIST      If gethostbyname() hostent struct contains a list of addresses.
HDBUUCP        Build with support for Honey DanBer UUCP.
HPUX           Build for Hewlett Packard HP-UX.
HPUX9          Build for Hewlett Packard HP-UX 9.x.
HPUX10         Build for Hewlett Packard HP-UX 10.x.
HWPARITY       Define if this version can SET PARITY HARDWARE { EVEN, ODD...}
I386IX         Build for Interactive System V R3.
IFDEBUG        Add IF stmts "if (deblog)" before "debug()" calls.
INADDRX        TCP/IP inet_addr() type is struct inaddr, not unsigned long.
INTERLAN       Build with support for Racal/Interlan TCP/IP.
ISDIRBUG       System defs of S_ISDIR and S_ISREG have bug, define ourselves.
ISIII          Build for Interactive System III.
IX370          Build for IBM IX/370.
KANJI          Build with Kanji character-set translation support.
LCKDIR         UUCP lock directory is /usr/spool/uucp/LCK/.
LFDEVNO        UUCP lockfile name uses device numbers, as in SVR4.
LINUXFSSTND    For Linux, use FSSTND UUCP lockfile conventions (default).
LOCK_DIR=xxx   UUCP lock directory is xxx.
LOCKF          Use lockf() (in addition to lockfiles) on serial lines
LONGFN         BSD long filenames supported using <dir.h> and opendir().
LYNXOS         Build for Lynx OS 2.2 or later (POSIX-based).
MAC            Build for Apple Macintosh with Mac OS.
MATCHDOT       Make wildcards match filenames that start with period (.)
MAXRP=xxx      Maximum receive-packet length.
MAXSP=xxx      Maximum send-packet length.
MDEBUG         Malloc-debugging requested.
MINIDIAL       Minimum modem dialer support: CCITT, Hayes, Unkown, and None.
MINIX          Build for MINIX.
MIPS           Build for MIPS workstation.
MULTINET       Build with support for TGV MultiNet TCP/IP (VAX/VMS).
M_UNIX         Defined by SCO.
NAP            The nap() is available (conflicts with SELECT and USLEEP)
NAPHACK        The nap() call is available but only as syscall(3112,...)
NDIR           BSD long filenames supported using <ndir.h> and opendir().
NDGPWNAM       Don't declare getpwnam().
NDSYSERRLIST   Don't declare sys_errlist[].
NEEDSELECTDEFS select() is avaible but we need to define FD_blah ourselves.
NETCMD         Build with support for SET HOST /COMMAND and PIPE commands.
NEXT           Build for NeXT Mach 1.x or 2.x or 3.0, 3.1, or 3.2.
NEXT33         Build for NeXT Mach 3.3.
NOANSI         Disable ANSI C function prototyping.
NOAPC          Do not include CK_APC code.
NOB_xxxx       Disable SET SPEED xxxx
NOBIGBUF       Override BIGBUFOK when it is the default
NOBRKC         Don't try to refer to t_brkc or t_eof tchars structure members.
NOCCTRAP       Disable Control-C (SIGINT) trapping.
NOCKSPEED      Disable control-prefix removal feature (SET CONTROL).
NOCKTIMERS     Build without support for dynamic timers.
NOCKXYZ        Overrides CK_XYZ.
NOCKREGEX      Do not include [...] or {xxx,xxx,xxx} matching in ckmatch().
NOCMDL         Build with no command-line option processing.
NOCOTFMC       No Close(Open()) To Force Mode Change (UNIX version).
NOCSETS        Build with no support for character set translation.
NOCYRIL        Build with no support for Cyrillic character set translation.
NOCYRILLIC     Ditto.
NODEBUG        Build with no debug logging capability.
NODIAL         Build with no DIAL or SET DIAL commands.
NODISPO        Build to always refuse incoming MAIL or REMOTE PRINT files.
DNODISPLAY     Build with no file-transfer display.
NOESCSEQ       Build with no support for ANSI escape sequence recognition.
NOFAST         Do not make FAST Kermit protocol settings the default.
NOFDZERO       Do not use file descriptor 0 for remote-mode file transfer.
NOFILEH        Do not #include <sys/file.h>.
NOFRILLS       Build with "no frills" (this should be phased out...)
NOFTRUNCATE    Include this on UNIXes that don't have ftruncate().
NOGETUSERSHELL Include this on UNIXes that don't have getusershell().
NOGFTIMER      Don't use high-precision floating-point file-transfer timers.
NOHEBREW       Build with no support for Hebrew character sets.
NOHELP         Build with no built-in help.
NOIKSD         Build with IKSD support excluded.
NOINITGROUPS   Include this on UNIXes that don't have initgroups().
NOICP          Build with no interactive command parser.
NOJC           Build with no support for job control (suspend).
NOKANJI        Build with no support for Japanese Kanji character sets.
NOKVERBS       Build with no support for keyboard verbs (\Kverbs).
NOLATIN2       Build with no ISO Latin-2 character-set translation support.
NOLINKBITS     Use of S_ISLNK and _IFLNK untrustworthy; use readlink() instead.
NOLOCAL        Build without any local-mode features: No Making Connections.
NOLOGDIAL      Disable connection log.
NOLOGIN        Build without IKSD (network login) support.
NOLSTAT        Not OK to use lstat().
NOMDMHUP       Build without "modem-specific hangup" (e.g. ATH0) feature.
NOMHHOST       Exclude the multihomed-host TCP/IP code (if compilcation errors)
NOMINPUT       Build without MINPUT command.
NOMSEND        Build with no MSEND command.
NONAWS         Do not include TELNET Negotiate About Window Size support.
NONET          Do not include any network support.
NOPARSEN       Build without automatic parity detection.
NOPIPESEND     Disable file transfer using pipes and filters.
NOPOLL         Override CK_POLL definition.
NOPOPEN        The popen() library call is not available.
NOPURGE        Build with no PURGE command.
NOPUSH         Build with no escapes to operating system.
NOREALPATH     In UNIX, realpath() function is not available.
NORECALL       Disable the command-recall feature.
NOREDIRECT     Disable REDIRECT command.
NORENAME       Don't use rename() system call, use link()/unlink() (UNIX).
NORESEND       Build with no RESEND command.
NORETRY        Build with no command-retry feature.
NOSCRIPT       Build with no SCRIPT command.
NOSELECT       Don't try to use select().
NOSERVER       Build with no SERVER mode and no server-related commands.
NOSETBUF       Don't make console writes unbuffered.
NOSETREU       setreuid() and/or setregid() not available.
NOSHOW         Build with no SHOW command (not recommended!).
NOSIGWINCH     Disable SIGWINCH signal trapping.
NOSPL          Build with no script programming language.
NOSYMLINK      Include this for UNIXes that don't have readlink().
NOSYSIOCTLH    Do not #include <sys/ioctl.h>.
NOSYSTIMEH     Co not include <sys/time.h>.
NOSYSLOG       Disable syslogging code.
NOTCPOPTS      Build with no SET TCP options or underlying support.
NOTLOG         Build with no support for transaction logging.
NOUNICODE      Build with no support for Unicode character-set translation.
NOURL          Don't parse URLs
NOUUCP         Build with no UUCP lockfile support (dangerous!).
NOWARN         Make EXIT WARNING be OFF by default (otherwise it's ON).
NOWREFRESH     Override built-in definition of CK_WREFRESH (q.v.).
NOXFER         Build with no Kermit or other file-transfer protocols.
NOXMIT         Build with no TRANSMIT command.
NOXPRINT       Disables transparent print code.
OLDMSG         Use old "entering server mode" message (see ckcmai.c).
OLINUXHISPEED  Build in old Linux hi-serial-speed code (for Linux <= 1.0).
OPENBSD        Build for OpenBSD.
OS2            Build for OS/2.
OSF            Build for OSF/1.
OSFPC          Build for OSF/1 on a PC.
OSF32          Digital UNIX 3.2 or later.
OSF40          Build for Digital UNIX 4.0.
OSF50          Build for Digital UNIX 5.0.
OSK            Build for OS-9.
OXOS           Build for Olivetti X/OS 2.3.
PCIX           Build for PC/IX
PID_T=xxx      Type for pids is xxx (normally int or pid_t).
POSIX          Build for POSIX: use POSIX header files, functions, etc.
_POSIX_SOURCE  Disable non-POSIX features.
PROVX1         Build for Venix 1.0 on DEC Professional 3xx.
PTX            Build for Dynix/PTX
PWID_T=xxx     getpwid() type is xxx.
RBSIZ=xxx      Define overall size of receive-packet buffer (with DYNAMIC).
RDCHK          rdchk() system call is available.
RENAME         rename() system call is available (UNIX).
RTAIX          Build for AIX 2.2.1 on IBM RT PC.
RTU            Build for Masscomp / Concurrent RTU.
SAVEDUID       BSD or other non-AT&T UNIX has saved-setuid feature.
SBSIZ=xxx      Define overall size of send-packet buffer (use with DYNAMIC).
SDIRENT        Directory structure specified in <sys/dirent.h>.
SELECT         select() function available (conflicts with RDCHK and CK_POLL)
SELECT_H       Include <sys/select.h> for select()-releated definitions.
SETEUID        BSD 4.4-style seteXid() functions available.
SIG_V          Type for signal() is void.  Used to override normal assumption.
SIG_I          Type for signal() is int.  Used to override normal assumption.
SOCKOPT_T      Override default data type for get/setsockopt() option length.
SOLARIS        Build for Solaris.
SOLARIS25      Build for Solaris 2.5 or later.
SONYNEWS       Build for Sony NEWS-OS.
STERMIOX       <sys/termiox.h> is available.
STRATUS        Build for Stratus VOS.
STRATUSX25     Include Stratus VOS X.25 support.
SUN4S5         Build for SUNOS 4.x in the System V R3 environment.
SUNOS4         Build for SUNOS 4.0 in the BSD environment.
SUNOS41        Build for SUNOS 4.1 in the BSD environment.
SUNX25         Build with support for SunLink X.25.
SVR3           Build for AT&T System V Release 3.
SVR3JC         Allow job control support on System V Release 3 UNIX versions.
SVR4           Build for AT&T System V Release 4.
SW_ACC_ID      UNIX only -- swap real & effective ids around access() calls.
sxaE50         Build for PFU Compact A Series SX/A TISP.
SYSLOGLEVEL=n  Force syslogging at given level.
SYSTIMEH       Include <sys/time.h>.
SYSUTIMEH      Include <sys/utime.h> for setting file dates (88OPEN)
TCPSOCKET      Build with support for TCP/IP via Berkeley sockets library.
TERMIOX        <termiox.h> header file is available (mostly SVR4).
TNCODE         Include TELNET-specific code.
TOWER1         Build for NCR Tower 1632 with OS 1.02.
TRS16          Build for Tandy 16/6000.
UID_T=xxx      Type for uids is xxx (normally int or uid_t).
UNIX           Must be defined for all UNIX versions.
UNIX351M       AT&T UNIX 3.51m on the AT&T 7300 UNIX PC.
USE_LSTAT      OK to use lstat().
USE_MEMCPY     Define this if memcpy()/memset()/memmove() available.
USE_STRERROR   Define this if strerror() is available.
USLEEP         usleep() system call available (conflicts with NAP & SELECT).
UTEK           Build for Tektronix workstations with UTEK OS.
UTIMEH         Include <utime.h> for setting file dates (SVR4, POSIX)
UTS24          Build for Amdahl UTS 2.4.
V7             Build for Version 7 UNIX.
VMS            Build for VAX/VMS.
VOID=xxx       VOID type for functions (int or void).
VXVE           Build for CDC VX/VE 5.2.1.
WAIT_T=xxx     Type of argument passed to wait().
WINTCP         Build with Wollongong VAX/VMS TCP/IP (implies TCPSOCKET)
WOLLONGONG     Build with Wollongong UNIX TCP/IP (implies TCPSOCKET)
XENIX          Build for Xenix (SCO, Tandy, others).
XNDIR          Support for BSD long filenames via <sys/ndir.h>.
XYZ_INTERNAL   Support for XYZMODEM protocols is internal, not external.
ZFCDAT         Define this if zfcdat() function is available in Kermit.
ZILOG          Build for Zilog ZEUS.
ZJDATE         Has zjdate() function that converts date to Julian format.
XPRINT         Transparent print code included in CONNECT module.

(End of CKCCFG.TXT)
