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C-Kermit Configuration Options
Frank da Cruz
[1]The Kermit Project
[2]Columbia University
As of: C-Kermit 8.0.211, 10 April 2004
This page last updated: Sun Apr 11 16:45:55 2004 (New York USA Time)
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This document describes configuration options 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
serial-port, modem, and network support, and a list of C-Kermit's
compile-time options.
For details about your particular operating system, also see the
system-specific installation instructions file, such as the
[21]C-Kermit Installation Instructions for Unix.
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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
Starting in version 7.0, fast settings are the default. To override
these at compile time, include:
in the C compiler CFLAGS. Even with the fast defaults, C-Kermit
automatically drops 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.
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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
* This symbol should be defined only for C-Kermit implementations
that have implemented the ttspdlist() function, typically in the
ck?tio.c module. See [34]ckutio.c for an example.
* TTSPDLIST is automatically defined in [35]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.
That's the whole deal. When TTSPDLIST is not defined, the following
Speeds are defined in two places: the SET SPEED keyword list in the
command parser (as of this writing, in the [36]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
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
The [37]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
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 in [38]ckutio.c
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 [39]ckutio.c.
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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:
and then change your build procedure (if necessary) to include the
necessary libraries. For example, in Unix these are usually "curses"
or "ncurses" (and more recenlty, "ncursesw" and "slang"), perhaps also
"termcap", "termlib", or "tinfo":
"LIBS= -lcurses -ltermcap"
"LIBS= -lcurses -ltermlib"
"LIBS= -lncurses"
"LIBS= -ltermlib"
"LIBS= -ltinfo"
"man curses" for further information, and search through the Unix
[46]makefile for "CK_CURSES" to see many examples, and also see the
relevant sections of the [47]Unix C-Kermit Installation Instructions,
particularly Sections [48]4 and [49]9.2.
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 local-mode file transfer (i.e. after seeing the curses
file-transfer display) do not echo until you press the Return (Enter)
key. If this happens to you, try adding
to your makefile target (see comments in screenc() in [50]ckuusx.c for
an explanation).
If that doesn't fix the problem, then use a bigger hammer and replace
which tells Kermit to force stdout to be unbuffered so CBREAK mode can
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:
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 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
targets have been added to take care of this (e.g. sys3upcshcc), but
similar tricks might be necessary in other cases too.
On the curses file-transfer display, just below the "thermometer", 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
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:
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 [51]ckutio.c,
[52]ckufio.c, [53]ckuusx.c, [54]ckucmd.c, etc.
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Since version 5A, C-Kermit has included support for conversion 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), Greek, 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.
[61]Unicode support was added in C-Kermit 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, we get
the following sizes:
[ ] [ ] [ ] 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.
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The Kermit CONNECT and INPUT commands are coded to execute Application
Program Command escape sequences from the host:
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 included in the OS/2, Windows, VMS,
OS-9, and Unix versions, for which the symbol:
is defined automatically in [68]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 [69]ckuusr.h)
can be overridden by including:
on the CC command line.
C-Kermit's autodownload feature depends on the APC feature, so
deconfiguring APC also disables autodownload (it doesn't use APC
escape sequences, but uses the APC switching mechanism internally).
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6.1. [76]Feature Selection
6.2. [77]Changing Buffer Sizes
6.3. [78]Other Size-Related Items
6.4. [79]Space/Time Tradeoffs
(Also see [80]Section 4)
Each release of C-Kermit is larger than the last. On some computers
(usually old ones) the size of the program prevents it from being
successfully linked and loaded. On some others (also usually old
ones), 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.
If you are reading this section because all you want is a small, fast,
quick-to-load Kermit file-transfer application for the remote end of
your connection, and the remote end is Unix based, take a look at
6.1. Feature Selection
Features can be added or 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 accept command-line
definitions, you can put the corresponding #define statements in the
file ckcsym.h, for example:
#define NODEBUG
The following table shows the savings achieved when building C-Kermit
8.0 (Beta.04) with selected feature-deselection switches on an
Intel-based PC with Red Hat Linux 7.0 and gcc 2.96. The sizes are for
non-security builds. The fully configured non-security build is
2127408 bytes.
Option Size Savings Effect
NOICP 545330 74.4% No Interactive Command Parser (command-line only)
NOLOCAL 1539994 27.6% No making connections.
NOXFER 1551108 27.1% No file transfer.
IKSDONLY 1566608 26.4% Internet Kermit Server only.
NOCSETS 1750097 17.7% No character-set conversion.
NOSPL 1800293 15.4% No Script Programming Language.
NONET 1808575 15.0% No making network connections.
NOUNICODE 1834426 13.8% No Unicode character-set conversion.
NOHELP 1837877 13.6% No built-in help text.
NODEBUG 1891669 11.1% No debug log.
NOFRILLS 1918966 9.8% No "frills".
NOFTP 1972496 7.3% No FTP client.
NODIAL 1984488 6.7% No automatic modem dialing.
NOPUSH 2070184 2.7% No shell access, running external programs, etc.
NOIKSD 2074129 2.5% No Internet Kermit Server capability.
NOHTTP 2082610 2.1% No HTTP client.
NOFLOAT 2091332 1.7% No floating-point arithmetic.
MINIDIAL 2098035 1.4% No built-in support for many kinds of modems.
NOSERVER 2098987 1.3% No server mode.
NOSEXP 2105898 1.0% No S-Expressions.
NOPTY 2117743 0.5% No pseudoterminal support.
NORLOGIN 2121089 0.3% No RLOGIN connections.
NOOLDMODEMS 2124038 0.2% No built-in support for old kinds of modems.
NOSSH 2125696 0.1% No SSH command.
And here are a few combinations
Options Size Savings Effect
NODEBUG NOICP NOCSETS NOLOCAL 281641 86.7% No debug log, parser,
character sets, or making connections.
NOICP NOCSETS NOLOCAL 376468 82.3% No parser, character sets, or
making connections.
NOICP NOCSETS NONET 427510 79.9% No parser, character sets, or network
NOSPL NOCSETS 1423784 33.1% No script language, or character sets.
-DNOFRILLS removes various command synonyms; the following top-level
WHO; and the following REMOTE commands: KERMIT, LOGIN, LOGOUT, PRINT,
6.2. Changing Buffer Sizes
Most modern computers have so much memory that (a) there is no need to
scrimp and save, and (b) C-Kermit, even when fully configured, is
relatively small by today's standards.
Two major factors affect Kermit's size: feature selection and buffer
sizes. Buffer sizes affect such things as the maximum length for a
Kermit packet, the maximum length for a command, for a macro, for the
name of a macro, etc. Big buffer sizes are used when the following
symbol is defined:
as it is by default for most modern platforms (Linux, AIX 4 and 5,
HP-UX 10 and 11, Solaris, etc) in [82]ckuusr.h. If your build does not
get big buffers automatically (SHOW FEATURES tells you), you can
include them by rebuilding with BIGBUFOK defined; e.g. in Unix:
where xxxx is the makefile target. On the other hand, if you want to
build without big buffers when they normally would be selected, use:
There are options to control Kermit's packet buffer allocations. The
following symbols are defined in [83]ckcker.h in such a way that you
can override them by redefining them in CFLAGS:
-DMAXSP=xxxx - Maximum send-packet length.
-DMAXRP=xxxx - Maximum receive-packet length.
-DSBSIZ=xxxx - Total allocation for send-packet buffers.
-DRBSIZ=xxxx - Total allocation for receive-packet buffers.
The defaults depend on the platform.
Using dynamic allocation (-DDYNAMIC) reduces storage requirements for
the executable program on disk, and allows more and bigger packets at
runtime. This has proven safe over the years, and now most builds
(e.g. all Unix, VMS, Windows, and OS/2 ones) use dynamic memory
allocation by default. If it causes trouble, however, then omit the
-DDYNAMIC option from CFLAGS, or add -DNODYNAMIC.
6.3. 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") compilation / code-generation
model. This is needed for 16-bit PC-based UNIX versions (most or
all of which fail to build C-Kermit 7.0 and later anyway). This is
typically done with a -M and/or -F switch (see your cc manual or
man page for details).
b. Some development 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. (Actually, as of version 7.0, C-Kermit is
too big to build, period, even with overlays, on 2.xx BSD).
c. Similarly, some small and/or segment-based architectures support
"code mapping", which is similar to overlays (PDP11-based VENIX
1.0, circa 1984, was an example). See the linker documentation on
the affected platform.
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 or higher number,
-Onolimit (HP-UX), etc), try them; the greater the level of
optimization, the longer the compilation and more likely the
compiler will run out of memory. The the latter eventuality, some
compilers also provide command-line options to allocate more
memory for the optimizer, like "-Olimit number" in Ultrix.
b. If your platofrm supports shared libraries, change the make entry
to take advantage of this feature. The way to do this is, of
course, platform dependent; see the NeXT makefile target for an
example. some platforms (like Solaris) do it automatically and
give you no choice. But watch out: executables linked with shared
libraries are less portable than statically linked executables.
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 2.11 BSD
target for an example.
6.4. Space/Time Tradeoffs
There are more than 6000 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 [84]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).
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-DNODIAL removes automatic modem dialing completely, including the
entire [91]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 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:
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8.1. [98]TCP/IP
8.2. [99]X.25
8.3. [100]Other Networks
C-Kermit supports not only serial-port and modem connections, but also
TCP/IP and X.25 network connections. Some versions support other
network types too like DECnet, LAT, NETBIOS, etc. If you define the
following symbol:
then all network support is compiled away.
8.1. TCP/IP
8.1.1. [101]Firewalls
8.1.2. [102]Compilation and Linking Problems
8.1.3. [103]Enabling Host Address Lists
8.1.4. [104]Enabling Telnet NAWS
8.1.5. [105]Enabling Incoming TCP/IP Connections
8.1.6. [106]Disabling SET TCP Options
C-Kermit's TCP/IP features require the Berkeley sockets library or
equivalent, generally available on any Unix system, as well as in
Windows 9x/NT, OS/2, VMS, AOS/VS, VOS, etc. The TCP/IP support
includes built-in TELNET, FTP, and HTTP protocol. To select TCP/IP
support, include -DTCPSOCKET in your makefile target's CFLAGS, or (in
VMS) the appropriate variant (e.g. -DWOLLONGONG, -DMULTINET,
The VMS and/or early Unix third-party TCP/IP products are often
incompatible with each other, and sometimes with different versions of
themselves. For example, Wollongong reportedly put 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
* 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 computer it is
in /usr/include/netinet. Do this (as root, or get the system
administrator 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
[107]ckcnet.h, [108]ckctel.c, [109]ckctel.c, [110]ckctel.h,
[111]ckcftp.c, with miscellaneous SHOW commands, etc, in the various
ckuus*.c modules, plus code in the ck*con.c or ckucns.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:
In addition, if TCP_NODELAY is defined, the following command is also
SET TCP NODELAY (Nagle algorithm)
See the [112]C-Kermit user documentation for descriptions of these
8.1.1. Firewalls
There exist various types of firewalls, set up to separate users of an
internal TCP/IP network ("Intranet") from the great wide Internet, but
then to let selected users or services get through after all.
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 (if
necessary, i.e. if the libraries are not dynamically loaded) 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 (for SOCKS4) in C-Kermit by
including -DCK_SOCKS in your CFLAGS, and also adding:
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 negotiate the firewall
8.1.2. Compilation and Linking Problems
If you get a compilation error in [113]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
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 target, 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
8.1.4. Enabling Telnet NAWS
The Telnet Negotiation About Window Size (NAWS) option 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 includes 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
[114]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
[115]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 to the Telnet server any time the local 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 [116]Section 11).
If you want to disable incoming TCP/IP connections, then build
C-Kermit with:
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), add the following in CFLAGS:
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. Similarly
(in C-Kermit 7.0 or later) Stratus VOS and IBM AIX.
In UNIX, special makefile targets 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,
and selected by the user at runtime with the SET NETWORK TYPE command
or SET HOST switches.
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
Windows or 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
[117] if you are willing and able to work on such a
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The C language 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:
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Security, in the sense of secure authentication and strong encryption,
can be built into versionf of C-Kermit for which the appropriate
libraries and header files are available (Kerberos IV, Kerberos V,
OpenSSL, SRP), as explained in great detail in the Kermit Security
. The following symbols govern C-Kermit's security features at build
Means do not configure any TELNET AUTHENTICATION support. It
implies NO_ENCRYPTION and undefines any of the auth and encrypt
types. It does not undefine CK_SSL even though builds with
CK_SSL cannot succeed without CK_AUTHENTICATION. (This will be
supported in a future release. It will be needed to allow
C-Kermit to be built only as an FTP client.)
Means do not compile in any KERBEROS support when
CK_AUTHENTICATION has been defined.
Do not compile in any SRP support when CK_AUTHENTICATION has
been defined.
Do not compile in any SSL/TLS support
Do not compile in any Telnet encryption support. It does not
affect the use of SSL/TLS
Do not compile in any SSH support whether internal or external
Telnet AUTHENTICATION support. (Also, required if SSL/TLS
support is desired.) On most platforms this does not autodefine
any authentication mechanisms such as Kerberos V, Kerberos IV,
SRP, ... Those need to be defined separately.
Defined automatically when KRB4, KRB5, or KRB524 are defined.
Implies that some version of Kerberos is in use.
Should be defined when Kerberos IV support is desired.
Should be defined when Kerberos V support is desired.
Should be defined if both Kerberos V and Kerberos IV are used
and the Kerberos IV support is provided by the MIT Kerberos IV
compatibility library in the current Kerberos 5 distribution.
Should be defined if KRB5 is defined and Kerberos 5 User to
User mode is desired.
Should be defined if Kerberos V support is provided by HEIMDAL.
Support for this option is not complete in C-Kermit 8.0. Anyone
interested in working on this should contact kermit-support.
Should be defined if SRP support is desired.
Should be defined if TELNET ENCRYPTION option support is
desired. This option does not define any particular encryption
types. That should be done by defining CK_DES or CK_CAST.
Should be defined if either DES or 3DES Telnet Encryption
option support is desired.
If CK_DES is defined and DES support is being provided by
either Eric Young's libdes.a or OpenSSL 0.9.6x or earlier, this
option must be defined. If it is not defined, it will be
assumed that DES support is provided by the MIT Kerberos IV
Should be defined if CAST Telnet Encryption option support is
Should be defined if SSL/TLS support (OpenSSL) is desired.
If KRB5 is defined, and OpenSSL is built to support the
Kerberos 5 ciphers, then you should define SSL_KRB5
If you are using OpenSSL 0.9.7 or higher and do not wish to
build with support for Kerberos 5 TLS ciphers, this option must
be defined.
If you are using OpenSSL 0.9.6 or higher and it has been
compiled with support for ZLIB compression, this option should
be defined to enable Kermit to properly enable the use of
Defined for C-Kermit to enable the use of external SSH clients
from the Kermit command language
Defined for Kermit implementations that have integrated SSH
support. Currently only Windows.
Defined if either SSHCMD or SSHBUILTIN are defined.
Telnet Send Location support.
Do not include Telnet Send Location support.
Telnet X-Display Location support. Determines if the X-Display
location information is sent to the Telnet server either via
Telnet XDISPLOC or NEW-ENV options.
Do not include Telnet X-Display Location support.
Telnet Forward X Windows Session Data option. Used to protect
the privacy and integrity of X Windows Sessions when secure
telnet sessions are in use.
Do not include Telnet Forward X Windows Session Data option.
Besides the strong forms of security listed above, C-Kermit also
embodies various internal security features, including:
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 [130]Section 11 of the [131]Unix C-Kermit
Installation Instructions. about set[ug]id configuration.
Additional restrictions can be enforced when in server mode;
read about the DISABLE command in the user manual.
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.
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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, it works only with file
descriptors that were created by socket() and opened by connect() or
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 XENIX and UNIX)
If your system supports the select() function, but your version of
C-Kermit does not, try adding:
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
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
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 7.0, 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 [138]ckucns.c, and the fork-based one remains [139]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". 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()-based Unix CONNECT module, ckucns.c, must be used if
encryption is to be done, since the fork() version (ckucon.c) 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, plus it goes faster.
SHOW VERSIONS tells whether the CONNECT module uses fork() or
C-Kermit 8.0 adds learned script capability, which depends on
select(). All the "wermit" based targets (as opposed to "xermit") had
NOLEARN added to them. Whenever changing a target over from wermit to
xermit, also remember to remove NOLEARN.
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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
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 7.0, 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).
C-Kermit 7.0 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.
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Floating-point support was added in C-Kermit 7.0.
Floating-point numbers are enabled internally, at least for use in
high-precision file-transfer timers and statistics, unless the
following symbol is defined at compile time:
This might be necessary on old PCs that do not have built-in
floating-point hardware.
When NOFLOAT is not defined, the following symbol tells which
floating-point type to use:
The value is either "double" (normal for 32- and 16-bit architectures)
or "float" (normal for 64-bit architectures).
C-Kermit can be configured to use high-precision file-transfer timers
for more accurate statistics. This feature is enabled with:
and disabled with:
If you try to build with -DGFTIMER but you get compilation errors,
either fix them (and send email to telling what
you did), or else give up and use -DNOGFTIMER (or -DNOFLOAT) 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 [152]ckcdeb.h for the CKFLOAT
Floating-point arithmetic is also supported in the script programming
language. First via the \fpp...() functions, such as \fppadd(), which
adds two floating-point numbers, second in S-Expressions. Addition,
subtraction, multiplication, and division are always available. But
other functions such as logs, raising to powers, sines and cosines,
etc, require the C Math library. To include user-level floating-point
math you must put:
and in Unix you must link with the Math library:
LIBS=".... -lm"
In K95 and VMS, FNFLOAT is defined automatically if CKFLOAT is
defined. In Unix, however, FNFLOAT must be added to each makefile
target individually, because of the special linking instructions that
must also be added to each target.
Note: S-Expressions require FNFLOAT.
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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
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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 [162]ckcdeb.h and
[163]ckcnet.h for inference rules. For example SVR3 implies ATTSV,
MULTINET implies TCPSOCKET, and so on.
Here is the complete list of the Kermit-specific compile-time
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
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
CKLEARN Build with support for learned scripts.
CKLOGDIAL Enable connection log.
CKMAXPATH Maximum length for a fully qualified filename.
CKREGEX (misnomer) Include [...] or {xxx,xxx,xxx} matching in
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_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_PAM Include PAM authentication (might also require -lpam).
CK_PCT_BAR Fullscreen file transfer display should include
CK_POLL System-V or POSIX based UNIX has poll() function.
CK_POSIX_SIG Use POSIX signal handing: sigjmp_buf, sigsetjmp,
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_SHADOW Include support for shadow passwords (e.g. for IKSD
CK_SOCKBUF Enable TCP socket-buffer-size-increasing code.
CK_SOCKS UNIX only: Build with socks library rather than regular
CK_SOCKS5 UNIX only: Build with socks 5 lib rather than regular
CK_SPEED Enable control-character unprefixing.
CK_SYSINI="xxxxx" Quoted string to be used as system-wide init file
CK_TIMERS Build with support for dynamically calculated packet
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
CKFLOAT=type Floating-point data type, "double" or "float".
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.
FNFLOAT Include floating-point math functions (logs, sin, cos, exp,
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
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,
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
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 (quoted string).
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=number Maximum receive-packet length.
MAXSP=number 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
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.
NOARROWKEYS Exclude code to parse ANSI arrow-key sequences.
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.
NOCKFQHOSTNAME Exclude code to get fully qualified hostname in case it
causes core dumps.
NOCCTRAP Disable Control-C (SIGINT) trapping.
NOCKSPEED Disable control-prefix removal feature (SET CONTROL).
NOCKTIMERS Build without support for dynamic timers.
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.
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>.
NOFLOAT Don't include any floating-point data types or operations.
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
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.
NOLEARN Build with no support for learned scripts.
NOLINKBITS Use of S_ISLNK and _IFLNK untrustworthy; use readlink()
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
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.
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.
NONOSETBUF DO 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.
NOSTAT Don't call stat() from mainline code.
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.
NOTM_ISDST Struct tm has no tm_isdst member.
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 [164]ckcmai.c).
OLINUXHISPEED Build in old Linux hi-serial-speed code (for Linux <=
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
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
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()
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_ARROWKEYS Include code to parse ANSI arrow-key sequences.
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.
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C-Kermit Configuration Options / [169]The Kermit Project /
[170]Columbia University / [171] / 14 March 2003