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With version 1.23 groff/troff disabled the non-portable font CW and started to complain about a missing CW font when previewing some of the man pages, with messages like $ man --warnings cpumf/man/pai.8 > /dev/null troff:<standard input>:244: warning: cannot select font 'CW' Use CR to replace CW. Closes: https://github.com/ibm-s390-linux/s390-tools/pull/187 [hoeppner@linux.ibm.com: Adapt commit message] Signed-off-by: Dan Horák <dan@danny.cz> Signed-off-by: Jan Höppner <hoeppner@linux.ibm.com>
224 lines
6.4 KiB
Groff
224 lines
6.4 KiB
Groff
.\" iucvconn.1
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.\"
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.\"
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.\" Copyright IBM Corp. 2008, 2017
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.\" s390-tools is free software; you can redistribute it and/or modify
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.\" it under the terms of the MIT license. See LICENSE for details.
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.\" ----------------------------------------------------------------------
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.TH iucvconn "1" "March 2009" "s390-tools" "IUCV terminal applications"
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.
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.ds i \fBiucvconn\fP
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.
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.
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.
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.SH NAME
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iucvconn \- start terminal connection over z/VM IUCV
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.
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.
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.
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.SH SYNOPSIS
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.B iucvconn
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.RB [ \-h | \-\-help ]
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.br
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.B iucvconn
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.RB [ \-v | \-\-version ]
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.br
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.B iucvconn
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.RB [ \-e | \-\-escape-char
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.IR escape_char ]
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.RB [ \-s | \-\-sessionlog
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.IR log_file ]
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.I vm_guest
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.I terminal_id
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.
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.
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.
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.SH DESCRIPTION
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The \*i application establishes a terminal connection to another
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Linux instance. The Linux instance where \*i runs and the target Linux instance
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must be z/VM guest operating systems of the same z/VM instance.
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The communication path between both virtual machines is based on the z/VM
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Inter-User Communication Vehicle (IUCV).
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Because z/VM IUCV is independent from TCP/IP, Linux instances with no external
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network can be accessed.
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.PP
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\*i accesses the terminal specified by \fIterminal_id\fP on the z/VM guest
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virtual machine \fIvm_guest\fP.
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The \fIterminal_id\fP is similar to a port number in TCP/IP communications.
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.
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\fIterminal_id\fP is case-sensitive and consists of up to 8 alphanumeric
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characters. \fIterminal_id\fP must either identify a running \fBiucvtty\fP
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instance, or a terminal device provided by the z/VM IUCV hypervisor console
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(HVC) device driver.
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.
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.
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.
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.SH OPTIONS
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.TP
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.BR \-h ", " \-\-help
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Display a short help text, then exit.
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.
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.TP
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.BR \-v ", " \-\-version
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Display the version number of \*i, then exit.
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.
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.TP
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.BR \-e ", " \-\-escape-char\~\fIescape_char\fP
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Set an escape character for this terminal session. You need an escape character
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to access special \*i functions. The default escape character is underscore (_).
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If \fIescape_char\fP is set to "none", escaping is not possible.
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The escape character can be the closing bracket (]), the caret (^), the
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underscore (_), or any alphabetical character except C, D, Q, S and Z.
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The \fIescape_char\fP character is not case-sensitive.
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To invoke a \*i function, press Ctrl\^+\^\fIescape_char\fP, followed
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by the function character. For example, press "Ctrl\^+\^_ d" to disconnect the
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terminal session and exit \*i.
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For details, see section "ESCAPE CHARACTERS" below.
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.
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.TP
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.BR \-s ", " \-\-sessionlog\~\fIlogfile\fP
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Create a transcript of the terminal session and write session data to three
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different files.
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\fIlog_file\fP contains the raw terminal data stream. The
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.I log_file\fB.timing\fP
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file contains timing data that can be used for replaying the raw terminal data
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stream using realistic output delays.
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Additional terminal session information is logged to
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.IR log_file\fB.info\fP "."
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If any of these files already exist, \*i exits with an error. To proceed
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either delete the files or choose another file name for \fIlog_file\fP.
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.
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.
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.
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.SH "ESCAPE CHARACTERS"
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\*i supports functions through the use of an escape character.
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The default escape character (\fIescape_char\fP) is underscore (_).
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To enter the "escape mode" of \*i, press the Control and the \fIescape_char\fP
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key together ("Ctrl\^+\^_") In the "escape mode", \*i expects a single character
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designating the special function.
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The special functions are (assuming \fIescape_char\fP is set to underscore (_)):
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.RS 4
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.IP "\fBCtrl\^+\^_\fP" 8
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Send the escape character to the connected terminal.
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.IP "\fB.\fP or \fBd\fP" 8
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Disconnect and exit \*i.
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.IP "\fBr\fP" 8
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Force resizing of the connected terminal.
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.RE
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.PP
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Any other single character is ignored and is not send to the terminal. If
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multiple characters are entered together, \*i leaves the "escape mode" and sends
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the characters to the connected terminal.
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.
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.\" FIXME: change "connected terminal" to terminal
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.
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.
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.SH "EXAMPLES"
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To access the "lnxterm" terminal on the Linux instance in
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z/VM guest virtual machine LNXSYS01:
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.PP
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.ft CR
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.in +0.25in
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.nf
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iucvconn LNXSYS01 lnxterm
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.fi
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.in -0.25in
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.ft
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.PP
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To access the first z/VM IUCV HVC terminal on the Linux instance in
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z/VM guest virtual machine LNXSYS02:
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.PP
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.ft CR
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.in +0.25in
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.nf
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iucvconn LNXSYS02 lnxhvc0
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.fi
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.in -0.25in
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.ft
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.PP
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To create a transcript of the terminal session to the Linux instance in
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z/VM guest virtual machine LNXSYS99:
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.PP
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.ft CR
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.in +0.25in
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.nf
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iucvconn -s ~/transcripts/lnxsys99 LNXSYS99 lnxhvc0
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.fi
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.in -0.25in
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.ft
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.
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.
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.
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.SH ENVIRONMENT
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.TP
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.B TERM
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The terminal environment variable contains the name of the terminal
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(e.g. linux, xterm, ...) and also specifies the terminal capabilities.
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\*i transfers the value of the \fBTERM\fP environment variable at connection
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startup to the target system. The \fBiucvtty\fP application sets the
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\fBTERM\fP environment variable on the target system before the login program
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is started.
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Setting the \fBTERM\fP environment variable ensures that the terminal
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capabilities are the same on both sides of the connection.
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The z/VM IUCV hypervisor console (HVC) device driver ignores the content of
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the \fBTERM\fP environment variable transferred by \*i. See the
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.BR hvc_iucv (9)
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manual page for instructions to configure the terminal environment.
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.
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.
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.
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.SH DIAGNOSTICS
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If the Linux kernel does not include kernel support for the AF_IUCV network
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addressing family, \*i exits and displays the message
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.I 'AF_IUCV address family is not available: Address family not supported by
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.IR protocol' "."
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.
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.
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.
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.SH SECURITY
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.SS Linux
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The \*i program does not require superuser privileges and can be used by
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regular users. Each connection attempt and failure is logged to the
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.BR authpriv
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syslog facility.
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.\".PP
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.\"Depending on the login program started by the \fBiucvtty\fP program,
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.\"the user must authenticate to the remote system.
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.PP
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Terminal session transcripts facilitate logging and auditing of terminal
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activity on remote systems or recording and playing back terminal sessions,
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for example for education and presentations.
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.
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.
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.SS z/VM guest virtual machine
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The z/VM guest virtual machine must have authorization to establish IUCV
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communication paths to other z/VM guest virtual machines.
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See the
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.BR af_iucv (7)
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manual page for details about IUCV authorizations.
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.
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.
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.
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.SH NOTES
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The Linux instance where \*i runs and the target Linux instances
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must be z/VM guest operating systems of the same z/VM instance.
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.
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.
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.
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.SH "SEE ALSO"
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.BR iucvtty (1),
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.BR hvc_iucv (9),
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.BR af_iucv (7),
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.BR scriptreplay (1)
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.I "Linux on System z - Device Drivers, Features, and Commands"
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