# Class Shell_uq.call_engine

    class call_engine : ?ignore_error_code:bool -> ?mode:Shell_sys.group_mode -> ?stdin:Shell.producer -> ?stdout:Shell.consumer -> ?stderr:Shell.consumer -> Shell_sys.command list -> Unixqueue.event_system -> [Shell_sys.job_status] job_handler_engine_type

This engine corresponds to `Shell.call`. The command list is executed until the job is done. In this case, the status of the engine changes to ``Done` or ``Error`. If not `ignore_error_code`, failed jobs are reported by the error status ``Error Subprocess_failure`. If `ignore_error_code`, failed jobs are ignored, and result in the status ``Done` (however, jobs terminated by signals are still reported as errors).

For the other arguments see `Shell.call`.

When the engine goes to ``Error` or ``Aborted`, the job is terminated ( `Shell_sys.abandon_job` ).