path: root/sympathy.1

.TH sympathy 1  "%VERSIONSTAMP%" "%LONGVERSION%" "USER COMMANDS"
.SH NAME
sympathy \- client/server terminal emulator with logging
.SH SYNOPSIS
.B sympathy \-\fBt\fP
[
.B \fIterminal_options\fP
] [
.B \fIdisplay_options\fP
]
.br
.B sympathy \-\fBs\fP
[
.B \fIterminal_options\fP
] [
.B \fIserver_options\fP
]
.br
.B sympathy 
[
.B \-\fBc\fP \-\fBs\fP
] [
.B \fIterminal_options\fP
] [
.B \fIserver_options\fP
] [
.B \fIclient_options\fP
]
.br
.B sympathy \-\fBc\fP
[
.B \fIclient_options\fP
] 
.br
.B sympathy \-\fBr\fP
id
[
.B \fIclient_options\fP
] 
.br
.B sympathy \-\fBv\fP
.br
.\"           "sympathy -t      [-K] [-d serialdev|-p] [-b baud] [-f] [-L log] [-u]\n"
.\"           "sympathy -s      [-K] [-d serialdev|-p] [-b baud] [-f] [-L log] [-u] [-k skt]\n"
.\"           "                      [-n hlines] [-w WxH] [-F]\n"
.\"           "sympathy [-s -c] [-K] [-d serialdev|-p] [-b baud] [-f] [-L log] [-u] [-k skt]\n"
.\"           "                      [-n hlines] [-w WxH]\n"
.\"           "sympathy -c      [-H] [-u] -k skt\n"
.\"           "sympathy -r id   [-H] [-u]\n"
.\"           "sympathy {-l|-ls}\n"
.\"           "sympathy -v\n"
.\"           "sympathy -h\n"

.SH DESCRIPTION
.I Sympathy
is a VT52/VT100/ANSI terminal emulator with some special features. In normal use
.I sympathy
would sit between a terminal device (a serial port or a ptty) and
the user's usual terminal emaulator (eg xterm(1)). 
.I Sympathy
renders data from the terminal device into an internal frame buffer
and then expresses changes in this frame buffer to the outer terminal
emulator using a small subset of ANSI escape codes. 
.I Sympathy 
always generates valid escape codes to the outer terminal, and will 
reset the state of its internal terminal emulator when it detects
framing errors on the terminal device.
.PP
.I Sympathy\fP,
unlike screen(1), takes care to preserve the scrollback features
of the outer terminal emulator: lines that scroll of the top of the internal 
frame buffer are scrolled off the top of the outer terminal emaultor. When
sympathy is used in client/server mode, some history is added to the outer 
terminal emulator when the client connects.
.PP
.I Sympathy
also supports automatic baud rate detection, and advanced logging features.
.I Sympathy
logs whenever any of the modem control lines change state, receive errors,
and the contents
of any line on the frame buffer as the cursor moves off it.
.SH OPTIONS
.B \fImajor mode options\fP:
.TP 5
.B \-t
act as terminal emulator only:
.I sympathy
opens the terminal device and outputs into the outer terminal emulator, when sympathy exits the 
device is closed and no process remains. In this mode sympathy behaves like a traditional
terminal emulator such as cu(1) or minicom(1).
.TP 5
.B \-s
act as server only:
.I sympathy
opens the terminal device and renders into an internal frame buffer, listens for clients
on the socket and logs activity. By default the server will fork into a daemon processes
but can be forced to remain in the forground with the \-\fBF\fP option.
.TP 5
.B \-c\fP or \fB\-r\fP \fIid\fP
act as client only:
.I sympathy
connects to a sympathy server process and injects the history into the outer terminal
emulator,
and connects the user with the terminal device. One server process can support multiple 
client processes. This mode can also be used to obtain a dump of the current screen
in HTML format (see the \-\fBH\fP option). The \-\fPr\fP option connects to a server
on the socket ~/.sympathy/\fIid\fP  or if \fIid\fP is an integer 
~/.sympathy/\fIhostname\fP.\fIid\fP mimicking the behaviour of screen(1). With the 
\-\fBc\fP option the socket must be specified with the \-\fBk\fP option.
.TP 5
.B \fP[\fB \-c \-s \fP]
act as both client and server:
.I sympathy
forks. The child process becomes a server, and the orginal process becomes a client
which then connects to the server. This is the default major mode if no other is specified. 
Since the default terminal device is a ptty, running 
.I sympathy
with no arguments will start a new shell in a daemonized process and connect to it
as a client from the original process, mimicking the behaviour of screen(1)
.TP 5 
.B \-l\fP or \fB\-ls
show active sockets:
.I sympathy 
will show active sockets, ones to which a call to connect(2) succeeds, 
in ~/.sympathy. If the socket name begins with the hostname of the machine, and
the call to connect(2) fails, then socket will be unlinked. 
.TP 5 
.B \-v
show current version:
.I sympathy 
will print the the version number of the code it was compiled with.
.TP 5
.B \-h
show help:
.I sympathy 
will show brief usage instructions
.PP
.B \fIterminal_options\fP:
.TP 5
.B \-d \fIserialdev\fP
connect to terminal device \fIserialdev\fP, eg /dev/ttyS0. 
By default 
.I sympathy
doesn't
lock the terminal device, but checks periodically for lock files of other processes. If 
sympathy detects another lock file it displays \fBLocked\fP in the status line 
and refuses I/O on the device until the lock file is removed or becomes invalid.
To lock the device use the \-\fBK\fP option. 
.I Sympathy 
will in addition check that the name of the device does not occur in /proc/cmdline
as an argument to the \fIconsole\fP kernel parameter. 
The \-\fBd\fP option is incompatible with the \-\fBp\fP option. 
.TP 5
.B \-p
connect to a pseudo-tty instead of a terminal device, and fork a login shell in
it. The \-\fBd\fP option is incompatible with the \-\fBd\fP option. This is the default 
terminal device if none is specified.
.TP 5
.B \-K
lock the terminal device specificed in the \-\fBd\fP option. 
.I Sympathy
generates lock files in a staggering variety of formats and places. For locks
based on the name of the device sympathy generates lock files for all devices
with the same major and minor in /dev, /dev/usb and /dev/tts, it uses both normal
and lower case and replaces occurances of '/' in the device name with both '.' and '_'.
.I Sympathy
also generates locks based on the device major and minor numbers, and for all lock file
names generates them in any of the follwoing directories that are writable:
/var/lock/uucp, /var/spool/lock, /var/spool/uucp, /etc/locks, /usr/spool/uucp, 
/var/spool/locks, /usr/spool/lock, /usr/spool/locks, /usr/spool/uucp/LCK, /var/lock. 
Lock files are assumed to be in HDB format.
.TP 5
.B \-b \fIbaudrate\fP
set the baud rate of the terminal device specificed in the \-\fBd\fP to baudrate, if omitted
the current baudrate of the serial port will be used.
.TP 5
.B \-f
turn on flow control on the terminal device. This option add \fICRTSCTS\fP to sympathy's default 
\fIc_cflag\fPs of \fICS8|CREAD|CLOCAL\fP.
.TP 5
.B \-L \fIlogfile\fP
log activity to the file \fIlogfile\fP. If \fIlogfile\fP is '-' then log to \fIstdout\fP. Note
that logging to \fIstdout\fP only makes sense with the \-\fBF\fP \fIserver_option\fP. 
.TP 5
.B \-w \fIwidth\fP[x\fIheight\fP]
set the initalize size of the terminal emulator's frame buffer to be \fIwidth\fP columns
by \fIheight\fP rows. If \fIheight\fP is ommited it defaults to 24, the default width
is 80. These values may
be overridden later by terminal escape sequences. If \-\fBp\fP is also specificed
the ptty will have its window size set to match.
.PP
.B \fIdisplay_options\fP:
.TP 5
.B \-u
attempt to render unicode characters in the internal frame buffer to the outer terminal 
emulator by using ISO-2202 sequences. 
.I Sympathy
currently only checks to see if an appropriate character appears in the VT102 
US character set, or in the VT102 'special characters and line drawing' character set.
If the character appears in neither of these then it will be rendered on the outer
terminal emulator as a '?'.
.TP 5
.B \-H
render the current state of the internal frame buffer to stdout as HTML, then quit.
.PP
.B \fIclient_options\fP:
.TP 5
.B -k \fIsocket\fP
set the name in the filesystem of the socket to which
.I sympathy
should connect. This option is \fBmanditory\fP unless the \-\fBs\fP or \-\fBr\fP options
have also been given. If \-\fBs\fP is given then it will default to the socket which
the forked server process opens. See the discusion of the \-\fPr\fP option above, for
information on how 
.I sympathy 
chooses a socket name if \-\fBr\fP is specified.
.PP
.B \fIserver_options\fP:
.TP 5
.B -k \fIsocket\fP
set the name in the filesystem of the socket on which
.I sympathy
should listen for clients. If this option is omitted 
.I sympathy 
will create a 
socket in ~/.sympathy, creating that directory if neccessary, and named
\fIhostname\fP.\fIpid\fP where \fIpid\fP is the process id of the 
.I sympathy
process that created the socket.
.TP 5
.B -F
tells the 
.I sympathy
server process not to become a daemon but to remain the the foreground. This option is
incompatible with the \-\fBc\fP \-\fBs\fP major mode.
.TP 5
.B -n \fInlines\fP
sets the number of lines of history that the server process stores to \fInlines\fP. When 
a client connects \fInlines\fP of history are injected into the outer terminal emulator
so that they can be seen when scrolling back. By default the server stores 200 lines of
history.
.SH OPERATION
When 
.I sympathy
is relaying data to the outer terminal emulator a reverse video status line 
will be visible at the bottom of the screen. The status line shows pertinent
information. The first item on the line reminds you what the current escape character
is, the second indicates the terminal device to which 
.I sympathy
is connected, and the third shows the current baudrate. Other messages are:
.TP 5
.B Flow
indicates that that RTS/CTS flow control is in operation on the terminal device.
.TP 5
.B RTS
indicates that the terminal device is asserting the RTS line which indicates that 
the local system is ready to accept data from the remote system. If RTS/CTS
flow control is in operation then the operating system or hardware may
de-assert RTS even if RTS is shown. See the section on SERIAL PORT THEORY for
more information.
.TP 5
.B CTS
indicates that the terminal device has detected that the local system's CTS
line is being asserted, indicating that the remote system is ready to receive
data from the local system. See the section on SERIAL PORT THEORY for
more information.
.TP 5
.B DTR
indicates that the terminal device is asserting the DTR line indicating that the local
system would like the local DCE to establish a connection to the remote
DCE.  See the section on SERIAL PORT THEORY for more information.
.TP 5
.B DSR
indicates that the terminal device has detected that the local system's DSR line is
being asserted, indicating that the local DCE is ready. See the section on
SERIAL PORT THEORY for more information.
.TP 5
.B CD
indicates that the terminal device has detected that the local system's CD line is
being asserted, indicating that the local DCE has a connection to the remote DCE.
See the section on SERIAL PORT THEORY for more information.
.TP 5
.B RI
indicates that the terminal device has detected that the local system's RI line is
being asserted, indicating that the DCE has detected a ringing signal or incoming 
connexion.
.TP 5
.B n clients
shows the number of connected client processes. In the \-\fBt\fP major mode, this will 
always be zero.
.TP 5
.B Locked
the terminal device was opened without the \-\fbK\fP flag and another process is
currently using it. I/O to the device is currently suspended until the process dies
or removes its lock file.
.TP 5
.B n errs
indicates the number of frames recived by the terminal device with errors. The count
resets if no errors are detected by the device for 10 seconds.


.PP
 you can send commands by sending
ascii(7) STX from the outer terminal emulator (usally by pressing CTRL-B). 

the s
.SH LOG FILES
.SH EXIT STATUS
.SH ENVIRONMENT
.SH SERIAL PORT THEORY
.SH FILES
.SH EXAMPLES
.SH ERRORS
.SH SEE ALSO
screen(1) minicom(1) consolidate(1)
.SH STANDARDS
.SH BUGS
.PD
.IP \(bu 3
when the \-\fBc\fP \-\fBs\fP major mode is used without the \-\fBk\fP option the pid
used in the socket is that of the client process and therefore not unique.
.IP \(bu 3
the HTML generated with the \-\fBH\fP option is ugly.
.SH SECURITY CONSIDERATIONS
.SH AUTHOR