168 строки
7.9 KiB
C
168 строки
7.9 KiB
C
/*
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* Copyright (c) 2004-2005 The Trustees of Indiana University and Indiana
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* University Research and Technology
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* Corporation. All rights reserved.
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* Copyright (c) 2004-2006 The University of Tennessee and The University
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* of Tennessee Research Foundation. All rights
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* reserved.
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* Copyright (c) 2004-2005 High Performance Computing Center Stuttgart,
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* University of Stuttgart. All rights reserved.
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* Copyright (c) 2004-2005 The Regents of the University of California.
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* All rights reserved.
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* $COPYRIGHT$
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*
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* Additional copyrights may follow
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*
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* $HEADER$
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*/
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/** @file:
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*
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* Find and/or create Open MPI session directory.
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*
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* The orte_session_dir() function searches for a temporary directory
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* that is used by the Open MPI system for storing system-critical
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* information. For a given system and user, the function attempts to
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* find (or create, if not found and create is requested) a directory
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* that will be used to independently house information for multiple
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* universes, as the user creates them. Thus, the function pursues a
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* directory tree of the form:
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*
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* \par \em [prefix-dir] An absolute path that identifies a temporary
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* directory that is read-write-execute accessible to everyone. The
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* function first checks to see if the user has specified the [prefix]
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* directory on the command line. If so, then the function will use
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* that [prefix] if the access permissions are correct, or will return
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* an error condition if not - the function will not search for
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* alternative locations if the user provides the [prefix] name.
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*
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* \par If the [prefix] is not provided by the user, the function
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* searches for a suitable directory in a specific order, taking the
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* first option that meets the access permission requirement, using:
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* (a) the "OMPI_PREFIX_ENV" environment variable; (b) the "TMPDIR"
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* environment variable; and (c) the "TMP" environment variabley. If
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* none of those environmental variables have been defined and/or the
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* function was unable to create a suitable directory within any of
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* them, then the function tries to use a default location of "/tmp",
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* where the "/" represents the top-level directory of the local
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* system. If none of these options are successful, the function
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* returns an error code.
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*
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* \par \em [openmpi-sessions]-[user-id]@[host]:[batchid] This serves
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* as a concentrator for all Open MPI session directories for this
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* user on the local system. If it doesn't already exist, this
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* directory is created with read-write-execute permissions
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* exclusively restricted to the user. If it does exist, the access
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* permissions are checked to ensure they are correct - if not, the
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* program attempts to correct them. If they can't' be changed to the
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* correct values, an error condition is returned. The [host] and
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* [batchid] fields are included to provide uniqueness on shared file
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* systems and batch schedulers, respectively.
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*
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* \par Note: The [prefix]/openmpi-sessions-[user-id]@[host]:[batchid]
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* directory is left on the system upon termination of an application
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* and/or an Open MPI universe for future use by the user. Thus, when
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* checking a potential location for the directory, the
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* orte_session_tree_init() function first checks to see if an
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* appropriate directory already exists, and uses it if it does.
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*
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* \par \em [universe-name] A directory is created for the specified
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* universe name. This is the directory that will be used to house all
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* information relating to the specific universe. If the directory
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* already exists (indicating that the user is joining an existing
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* universe), then the function ensures that the user has exclusive
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* read-write-execute permissions on the directory.
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*
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* \par \em [job] A directory is created for the specified job
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* name. This will house all information relating to that specific
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* job, including directories for each process within that job on this
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* host.
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*
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* \par \em [process] A directory for the specific process, will house
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* all information for that process.
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*
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* \par If \c create is \c true, the directory will be created and the
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* proc_info structure will be updated. If proc_info is false,
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*/
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#ifndef ORTE_SESSION_DIR_H_HAS_BEEN_INCLUDED
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#define ORTE_SESSION_DIR_H_HAS_BEEN_INCLUDED
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#include "orte_config.h"
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#include "orte/types.h"
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BEGIN_C_DECLS
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/** @param create A boolean variable that indicates whether or not to
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* create the specified directory. If set to "false",
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* the function only checks to see if an existing
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* directory can be found. This is typically used to
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* locate an already existing universe for reconnection
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* purposes. If set to "true", then the function
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* creates the directory, if possible.
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* @param prefix A string variable indicating where the user
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* stipulated the directory should be found or
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* placed. A value of "NULL" indicates that the user
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* specified no location - hence, the function explores
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* a range of "standard" locations.
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* @param hostid Name of the host on which the session directory is
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* being built. Used to build the name of the
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* "openmpi-sessions-[user]@[host]:[batch]" branch of
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* the directory tree. NULL indicates that the nodename
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* found in orte_process_info is to be used.
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* @param batchid Batch job name, used in batch scheduling
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* systems. NULL indicates that the default of "0" is
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* to be used.
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* @param proc Pointer to a process name for which the session
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* dir name is desired
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*
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* @retval ORTE_SUCCESS The directory was found and/or created with
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* the proper permissions.
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* @retval OMPI_ERROR The directory cannot be found (if create is
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* "false") or created (if create is "true").
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*/
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ORTE_DECLSPEC int orte_session_dir(bool create, char *prefix, char *hostid,
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char *batchid, orte_process_name_t *proc);
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/*
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* Construct the session directory name from the input parameters.
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* This function does no checking that the directory exists, or can be used
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*/
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ORTE_DECLSPEC int orte_session_dir_get_name(char **fulldirpath,
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char **prfx,
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char **frontend,
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char *hostid,
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char *batchid,
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orte_process_name_t *proc);
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/** The orte_session_dir_finalize() function performs a cleanup of the
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* session directory tree. It first removes the session directory for
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* the calling process. It then checks to see if the job-level session
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* directory is now empty - if so, it removes that level as
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* well. Finally, it checks to see if the universe-level session
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* directory is now empty - if so, it also removes that level. This
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* three-part "last-one-out" procedure ensures that the directory tree
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* is properly removed if all processes and applications within a
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* universe have completed.
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*
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* @param None
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* @retval ORTE_SUCCESS If the directory tree is properly cleaned up.
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* @retval OMPI_ERROR If something prevents the tree from being
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* properly cleaned up.
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*/
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ORTE_DECLSPEC int orte_session_dir_finalize(orte_process_name_t *proc);
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/** The orte_session_dir_cleanup() function performs a cleanup of the
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* session directory tree when a job is aborted. It cleans up all
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* process directories for a given job and then backs up the tree.
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*
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* @param jobid
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* @retval OMPI_SUCCESS If the directory tree is properly cleaned up.
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* @retval OMPI_ERROR If something prevents the tree from being
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* properly cleaned up.
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*/
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ORTE_DECLSPEC int orte_session_dir_cleanup(orte_jobid_t jobid);
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END_C_DECLS
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#endif /* ORTE_SESSION_DIR_H_HAS_BEEN_INCLUDED */
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