98 lines
4.4 KiB
C
98 lines
4.4 KiB
C
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/*
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* Host Resources 'wrapper' interface
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* calls the per-group interfaces from 'hr_*.h'
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*/
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/* Portions of this file are subject to the following copyright(s). See
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* the Net-SNMP's COPYING file for more details and other copyrights
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* that may apply:
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*/
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/*
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* Portions of this file are copyrighted by:
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* Copyright (C) 2007 Apple, Inc. All rights reserved.
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* Use is subject to license terms specified in the COPYING file
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* distributed with the Net-SNMP package.
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*/
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config_require(host/hr_system)
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config_require(host/hr_device)
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config_require(host/hr_other)
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config_require(host/hr_proc)
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config_require(host/hr_network)
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config_require(host/hr_print)
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config_require(host/hr_disk)
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config_require(host/hr_partition)
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config_version_require((host/hr_storage, 5.7, host/hrh_storage))
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config_version_require((host/hr_filesys, 5.7, host/hrh_filesys))
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config_version_require((host/hr_swinst, 5.6, host/hrSWInstalledTable))
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config_version_require((host/hr_swrun, 5.6, host/hrSWRunTable))
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/* add the host resources mib to the default mibs to load */
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config_add_mib(HOST-RESOURCES-MIB)
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config_add_mib(HOST-RESOURCES-TYPES)
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/*********************************************
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*
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* A few words about the design of the Host Resources
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* implementation - particularly as regards the hrDevice
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* group and hrDeviceIndex. This (and hrStorageIndex) make
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* use of the non-consecutive nature of SNMP instance identifiers.
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*
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* hrDeviceIndex is structured in a 'major/minor' form,
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* with the high end indicating the type of device
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* (following the enumerations of hrDeviceType) and the low
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* end being used to differentiate between devices of that type.
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*
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* The implementation of walking through the available devices
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* uses a pair of arrays of functions - indexed by hrDeviceType
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* These are used to perform any initialisation needed for that
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* type of device, and to step through the instances of that type.
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* This latter 'get_next' routing returns the hrDeviceIndex (including
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* the hrDeviceType major number), or -1 if there are no further
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* instances of that type.
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* When all devices of a particular type have been processed, the
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* initialisation function for the next device type is called,
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* and so on until all devices have been proceesed.
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*
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* Similar arrays are used to provide type-specific functions to
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* return the "common" device information (description, ID, status
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* and error count), and to save any internal structures needed
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* to provide these.
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* A final array is used to indicate whether hrDeviceIndexes are
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* returned in a random order, or strictly increasing. In the
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* latter case, this allows the search for a particular index to
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* terminate as soon as the 'next' device is reached, without needing
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* to check the rest of them. Similarly, once a particular type of
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* device has been scanned, further types will not be examined unless
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* a suitable index has not yet been found.
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*
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* The index used for hrFSIndex is also used as hrStorageIndex,
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* for those storage areas corresponding to filestore.
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* Additional storage areas (such as memory or swap space) are
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* distinguished by index values greater than a defined constant.
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* Currently these are individually defined entries, but other
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* ranges could be implemented similarly.
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* If hrFSIndex was re-implemented to reflect internal identifiers,
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* it would be possible to reverse the sense of the current
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* implementation, with non-filestore storage having indices
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* less than a defined constant, rather than greater.
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*
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*
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* Much of the detailed implementation of this group (as opposed to
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* the implementation infrastructure outlined about) is likely to
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* be very system-specific.
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* The initial implementation (for HP-UX 9 and Linux) should be
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* regarded as a 'proof of concept' example, rather than as
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* finished, releasable code. This particularly hold for the
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* disk device discovery code, which is gross in the extreme,
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* and should never have seen the light of day!
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* Hopefully this can be ripped out and given a quiet burial as
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* soon as is decently possible.
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*
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* Now it's up to the rest of you to hammer this into some sort of
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* sensible shape.
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* Dave Shield
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*
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*********************************************/
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