Add a little documentation to iof.h.
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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 (c) 2007 Cisco, Inc. All rights reserved.
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* $COPYRIGHT$
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*
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* Additional copyrights may follow
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@ -19,6 +20,86 @@
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* @file
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*
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* I/O Forwarding Service
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* The I/O forwarding service (IOF) is used to push file descriptor
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* streams between ORTE processes. It is currently primarily used to
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* push stdin, stdout, and stderr between ORTE processes, but can be
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* used with any file descriptor stream.
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*
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* In practice, the IOF acts as a multiplexor between local file
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* descriptors and the OOB; the OOB relays information from local file
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* descriptors to remote file descriptors. Note that the IOF allows
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* many-to-one mappings; SOURCE streams can be directed to multiple
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* destinations and SINK streams can receive input from multiple
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* sources.
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*
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* The design is fairly simple: streams are designated as either
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* ORTE_IOF_SOURCEs or ORTE_IOF_SINKs. SOURCE streams provide content
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* that is pushed elsewhere. SINK streams accept content that
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* originated from elsewhere. In short, we read from SOURCEs and we
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* write to SINKs.
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*
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* Streams are identified by ORTE process name (to include wildecards,
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* such as "all processes in ORTE job X") and tag. There are
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* currently 4 predefined tags, although any integer value is
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* sufficient:
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*
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* - ORTE_IOF_ANY (value -1): any stream will match
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* - ORTE_IOF_STDIN (value 0): recommended for file descriptor 0, or
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* wherever the standard input is currently tied.
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* - ORTE_IOF_STDOUT (value 1): recommended for file descriptor 1, or
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* wherever the standard output is currently tied.
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* - ORTE_IOF_STDERR (value 2): recommended for file descriptor 2, or
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* wherever the standard error is currently tied.
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*
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* Note that since streams are identified by ORTE process name, the
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* caller has no idea whether the stream is on the local node or a
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* remote node -- it's just a stream.
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*
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* IOF components are selected on a "one of many" basis, meaning that
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* only one IOF component will be selected for a given process.
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* Details for the various components are given in their source code
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* bases.
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*
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* The following basic actions are supported in IOF:
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*
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* publish: File descriptors are "published" as a stream as a
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* mechanism to make them available to other processes. For example,
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* if a stdout descriptor is available from process X, then process X
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* needs to publish it (and make it a stream) in order to make that
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* stdout stream available to any other process.
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*
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* unpublish: The opposite of publish; when a stream is unpublished,
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* the content from that file desciptor is no longer available to
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* other processes.
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*
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* push: Tie together a local file descriptor (*not* a stream!) that
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* should be treated as a source to a stream that should be treated as
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* a SINK. Subsequent input that appears on the file descriptor will
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* automatically be pushed to the SINK stream. There is currently no
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* way to stop a push; once it starts, it runs until an EOF is
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* received on the file descriptor or the target stream is
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* unpublished.
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*
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* pull: Tie together a local file descriptor (*not* a stream!) that
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* should be treated as a sink to a stream that should be treated as a
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* SOURCE. Subsequent input that appears via the stream will
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* automatically be sent to the target file descriptor. There is
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* currently no way to stop a pull; once it starts, it runs until an
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* EOF is receives on the file descriptor or the source stream is
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* unpublished.
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*
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* subscribe: Setup a callback function that is invoked whenever a
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* fragment from a matching stream arrives. This can be used to
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* post-process fragment information, such as prepending a prefix to
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* stdout data before outputting it to the user's display in order to
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* identify the source process.
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*
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* unsubscribe: Remove a callback that was previously setup via the
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* subscribe action.
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*
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* flush: Block until all pending data has been written down local
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* file descriptors and/or completed sending across the OOB to remote
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* process targets.
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*/
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#ifndef ORTE_IOF_H
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