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NAME
ttsession - the ToolTalk message server
SYNOPSIS
ttsession [-hNpsStv] [-E|-X] [-a level] [-d display]
[-c [command]]
DESCRIPTION
The ttsession utility is the ToolTalk message server. This
background process must be running before any messages can
be sent or received. Each message server defines a session.
The message server has no user interface and typically runs
in the background, started either by the user's .xinitrc
file or automatically by any program that needs to send or
receive a message.
OPTIONS
The following options are available:
-a level
Set the server authentication level. The following
level string values are supported:
unix The sender and receiver must have the
same user ID.
des The underlying RPC calls use AUTH_DES.
gss The underlying RPC calls use RPCSEC_GSS.
For gss, additional options may be
specified after an immediately following
comma in a comma separated (without
spaces) list of suboptions and keyword-
attribute pairs:
protect={access,integrity,privacy}
Specify the GSS service type. If no
service type is specified,
protect=access is assumed.
protect=access
means the GSS mechanism is
used to verify that clients
have the credentials of the
user that started ttsession.
protect=integrity
means the GSS mechanism is
used to verify integrity of
the data transmitted between
ttsession and its clients.
protect=integrity implies
protect=access
protect=privacy
means the Gss mechanism is
used to provide privacy
against the data transmitted
between ttsession and its
clients. protect=integrity
implies protect=access.
mechanism=<mechanism name>
Use the named security mechanism.
If no mechanism is specifierd,
ttsession wil arbitrarily choose
one of the installed mechanisms
qop=<quality of protection>
Use the named quality of protec-
tion. If the quality of protection
is not specified, the default for
the mechanism is used.
EXAMPLE
To specify GSS authentication using the
kerberos_v5 mechanism and the
GSS_KRB5_CONF_C_QOP_DES quality of protection,
start ttsession as:
ttsession -a gss,mechanism=kerberos_v5,qop=GSS_KRB5_CONF_C_QOP_DES
This assumes that the kerberos_v5 mechanism is
installed.
Security options can be overridden on a system-
wide basis via the file /etc/default/ttsession
(ttsession_file(4)).
-c [command]
Start a process tree session and run the given
command. The ttsession utility sets the
environment variable TT_SESSION to the name of
this session. Any process started with this
variable in the environment defaults to being in
this session. If command is omitted, ttsession
invokes the shell named by the SHELL environment
variable. Everything after -c on the command
line is used as the command to be executed.
-d display
Specify an X Windows display. The ToolTalk ses-
sion will consist of those applications display-
ing on the named display. The default display
is identified by the DISPLAY environment vari-
able.
-E Read in the types from the Classing Engine data-
base. If neither -E nor -X is given, -X is
assumed.
-h Write a help message to standard error that
describes the command syntax of ttsession, and
exit.
-N Maximize the number of clients allowed to con-
nect to (in other words, open procids in) this
session by attempting to raise the limit of open
file descriptors. The precise number of clients
is system-dependent; on some systems this option
may have no effect. On Solaris 2.6 and later,
ttsession always maximizes the number of
clients, so there is no need to specify this
option.
-o allow_unauth_types_load=<yes|no>
By default calls to tt_session_types_load(3) in
the ToolTalk API will fail with TT_ERR_ACCESS.
The system wide default in this regard may be
changed via ttsession_file(4). The behavior for
a particular ttsession may be changed via this
option, if and only if the ttsession_file(4) has
not "locked" per-ttsession changes to this
option.
-p Write the name of a new process tree session to
standard output, and then fork a background
instance of ttsession to manage this new ses-
sion.
-s Silent. Do not write any warning messages to
standard error.
-S Do not fork a background instance to manage the
ttsession session.
-t Turn on trace mode. See ASYNCHRONOUS EVENTS for
how to turn tracing on and off during execution.
Tracing displays the state of a message when it
is first seen by ttsession. The lifetime of the
message is then shown by showing the result of
matching the message against type signatures
(dispatch stage) and then showing the result of
matching the message against any registered mes-
sage patterns (delivery stage). Any attempt to
send the message to a given process is also
shown together with the success of that attempt.
-v Write the version number to standard output and
exit.
-X Read in the types from the XDR format databases.
(Default)
OPERANDS
None.
STDIN
Not used.
INPUT FILES
The XDR format databases listed by the -X option are serial-
ized ToolTalk data structures of an unspecified format,
except that it is the same as the format of tt_type_comp(1)
output files.
The file /etc/default/ttsession (ttsession_file(4)) can be
used to change the system-wide behavior of the ttsession
process depending on the contents of the file.
ENVIRONMENT VARIABLES
The following environment variables affect the execution of
ttsession:
CEPATH In Classing Engine mode, this variable
tells the Classing Engine where to find
the databases that contain ToolTalk types.
See ce_db_build(1).
DISPLAY If TT_SESSION is not set and DISPLAY is
set, then the value of DISPLAY will be
used by all ToolTalk clients to identify
the ttsession process serving their X
display. If no such process is running,
the ToolTalk service will auto-start one.
If ttsession is run with the -d option and
DISPLAY is not set, ttsession sets DISPLAY
to be the value of the -d option for
itself and all processes it forks. This
helps ToolTalk clients to find the right X
display when they are auto-started by
ttsession.
LANG Provide a default value for the interna-
tionalization variables that are unset or
null. If LANG is unset or null, the
corresponding value from the
implementation-specific default locale
will be used. If any of the internation-
alization variables contains an invalid
setting, the utility behaves as if none of
the variables had been defined.
LC_ALL If set to a non-empty string value, over-
ride the values of all the other interna-
tionalization variables.
LC_MESSAGES Determine the locale that is used to
affect the format and contents of diagnos-
tic messages written to standard error and
informative messages written to standard
output.
NLSPATH Determine the location of message catalo-
gues for the processing of LC_MESSAGES.
TT_ARG_TRACE_WIDTH
Specify the number of bytes of argument
and context values to write when in trace
mode. The default is to print the first
40 bytes.
TTPATH In XDR mode, a colon-separated list of
directories that tells ToolTalk where to
find the ToolTalk types databases. See
tt_type_comp(1).
TTSESSION_CMD
Specify the shell command to be used by
all ToolTalk clients for auto-starting
ttsession.
The ttsession utility creates the following variable when it
invokes another process:
TT_FILE When ttsession invokes a tool to receive a
message, it copies the file attribute (if
any) of the message into this variable,
formatted in the same manner as returned
by the tt_message_file(3) function.
TT_SESSION The ttsession utility uses this variable
to communicate its session ID to the tools
that it starts. The format of the vari-
able is implementation specific. If this
variable is set, the ToolTalk client
library uses its value as the default ses-
sion ID.
TT_TOKEN Inform the ToolTalk client library that it
has been invoked by ttsession, so that the
client can confirm to ttsession that it
started successfully. The format of the
variable is implementation specific.
A tool started by ttsession must ensure that the TT_SESSION
and TT_TOKEN are present in the environment of any processes
it invokes.
RESOURCES
None.
ASYNCHRONOUS EVENTS
The ttsession utility reacts to two signals. If it receives
the SIGUSR1 signal, it toggles trace mode on or off (see the
-t option). If it receives the SIGUSR2 signal, it rereads
the types file. The ttsession utility takes the standard
action for all other signals.
STDOUT
When the -v option is used, ttsession writes the version
number in an unspecified format. When -p is used, ttsession
writes the name of a new process tree session.
STDERR
Used only for diagnostic messages and the help message writ-
ten by the -h option.
OUTPUT FILES
None.
EXTENDED DESCRIPTION
None.
EXIT STATUS
When the -c child process exits, ttsession exits with the
status of the exited child. Otherwise, the following exit
values are returned:
0 Normal termination. Without the -c or -S options, a
zero exit status means ttsession has successfully
forked an instance of itself that has begun serving
the session.
1 Abnormal termination. The ttsession utility was
given invalid command line options, was interrupted
by SIGINT, or encountered some internal error.
2 Collision. Another ttsession was found to be serving
the session already.
CONSEQUENCES OF ERRORS
The ttsession utility takes the standard action for all sig-
nals.
APPLICATION USAGE
Since everything after -c on the command line is used as the
command to be executed, -c should be the last option.
Tracing is helpful for seeing how messages are dispatched
and delivered, but the output may be voluminous.
EXAMPLES
None.
SEE ALSO
tt_type_comp(1), tttrace(1), tt_message_file(3),
ttsession_file(4).
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