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- execute command in a process contract
/usr/bin/ctrun [options] command [ argument]...
The ctrun utility starts a command in a newly created process contract. ctrun holds the contract and can be instructed to output or respond to events that occur within the contract.
The following options are supported:
Sets the informative and fatal events, respectively.
The following are valid events:
A member process dumped core.
core events are informative by default.
The last member of the process contract exited.
A member process exited.
A process was added to the process contract.
A member process encountered a hardware error.
hwerr events are fatal by default.
A member process received a fatal signal from a process in a different process contract.
Only core, hwerr, and signal events can be made fatal.
More events can be delivered than requested if ctrun requires them for its own purposes. For example, empty messages are always requested if a lifetime of contract is specified. See -l.
The following valid lifetime values are supported:
ctrun exits when the command exits, regardless of whether the contract is empty.
ctrun exits only when the contract exits. This is the default.
ctrun exits immediately, orphaning the contract.
The following options are supported:
Kills all processes in the contract if the holder (ctrun) exits.
This option is invalid when a lifetime of none is specified.
If a fatal error occurs, kills at most the process group of which the errant process is a member.
The contract inherits inheritable contracts when abandoned by member processes.
If the contract encounters a fault, this option attempts to restart the command count times. If count is 0, the attempt to restart continues indefinitely. By default, ctrun does not attempt to restart the command.
This option is invalid if a lifetime other than contract is specified or if the pgrponly option is used.
If the contract created by ctrun inherited subcontracts from its member processes, attempts to transfer them to the new contract when restarting.
This option is invalid unless -r is also specified.
Displays contract events and ctrun actions as they occur.
Displays verbose contract events, as are displayed by the -v option of ctwatch. Implies -v.
The following operands are supported:
One of the strings treated as an argument to command.
The command to be passed to execvp(2). See exec(2).
Example 1 Running a Shell in a New Process Contract
The following example runs a shell in a new process contract:
example% ctrun -l child -o pgrponly ksh
The -l child option argument is specified so that ctrun won't wait until all children of the shell have exited. -o pgrponly is specified because an interactive ksh puts each job in a new process group, and an error in one job is unlikely to affect the others.
Example 2 Running a Simple Server
The following example runs a simple server:
example% ctrun -r 0 -t -f hwerr,core,signal server
The -r 0 and -t options are specified to indicate that if the server encounters a fatal error, ctrun should try to restart it. The -f option makes “hwerr“, “core”, and “signal” fatal events.
If command is specified and successfully invoked (see exec(2)), the exit status of ctrun is the exit status of command. Otherwise, ctrun exits with one of the following values:
The child process exited abnormally.
ctrun encountered an internal error.
Invalid arguments were provided to ctrun.
command was found but could not be invoked.
command could not be found.
See attributes(5) for descriptions of the following attributes:
Human Readable Output is Unstable. Invocation is Evolving.