CTWATCH(1) User Commands CTWATCH(1)

NAME

ctwatch - watch events in a contract or group of contracts

SYNOPSIS

/usr/bin/ctwatch [-f] [-r] [-v] contract-type... | contract-id...

DESCRIPTION

The ctwatch utility allows a user to observe the events occurring within
a set of contracts or contract types. By default, ctwatch watches all
contracts.

OPTIONS

The following options are supported:

-f
Report events starting at the front of the event queue. Normally,
ctwatch reports only events which occur after it has been invoked.
With the -f option, any events that still exist in the contracts'
event queues when ctwatch is invoked (for example, unacknowledged
critical events) are also reported.


-r
Reliably watches all messages. Normally, the system may drop
informative events and acknowledged critical events at any time, so
ctwatch isn't guaranteed to see them all. This option may only be
used if the ctwatch is invoked with the {PRIV_CONTRACT_EVENT}
privilege asserted in its effective set.


-v
Request verbose event descriptions.

OPERANDS

The following operands are supported:

contract-type
Valid contract types are:

process
Process contracts.


contract-id
A valid contract id.

OUTPUT

The following list defines the column headings and the meanings of a
ctwatch report:

CTID
The contract ID generating the event.


EVID
The event ID.


CRIT
Whether the event is informative, critical, or initiates an
exit negotiation. Values are info, crit, or neg,
respectively.


ACK
The event has been acknowledged. Values are yes or "no".


CTTYPE
The contract type.


SUMMARY
A type-specific summary of the event.

EXAMPLES

Example 1: Watching a process contract

example% ctwatch -r 1

CTID EVID CRIT ACK CTTYPE SUMMARY
1 2 crit no process pid 100569 was created
1 3 info no process pid 100569 encountered hardware error
1 4 info no process pid 100568 exited
1 5 info no process pid 100569 exited
1 6 crit no process contract empty

EXIT STATUS

The following exit values are returned:

0
Successful completion.


1
An error occurred.


2
Invalid arguments.

FILES

/system/contract/*

ATTRIBUTES

See attributes(7) for descriptions of the following attributes:


+--------------------+-----------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+--------------------+-----------------+
|Interface Stability | See below. |
+--------------------+-----------------+


Human Readable Output is Unstable. Invocation is Evolving.

SEE ALSO

ctrun(1), ctstat(1), contract(5), process(5), attributes(7),
privileges(7)

NOTES

Ordering of events is only guaranteed within a single contract, or within
a single type when a type is specified.


ctwatch can only observe those events which are generated by contracts
owned or authored by processes with the same effective user ID as
ctwatch, unless the {PRIV_CONTRACT_OBSERVER} privilege is asserted in its
effective set.

July 14, 2004 CTWATCH(1)