help determine what the file is.

open file descriptor.

MPI plugins no long access structures in either srun or the slurmstepd.

Also, MPI plugins allocate state structures for each job step instance.

This allows the MPI plugins to be used in the SLURM API slurm_step_launch()
function.  It also allows slurm_step_launch() to be called multiple times
from within the same process.

and SLAUNCH_TASK_EPILOG environment variables.

    and SLURM_TASK_EPILOG. patch.1.2.0-pre11.070201.envproepilog from
    Dan Palermo, HP.

backup mode and it receives an epilog-complete RPC.

    otherwise StateSaveDir (which is likely a shared directory, possibly
    making core file identification more difficult).

before doing memcpy().