Summary: C programming language / query for hardware attributes q uestion.
From: Farmer, John (John.Farmer_at_TycoHealthcare.com)
Date: 04/14/05
- Previous message: Shaun.Racine_at_intier.com: "SUMMARY:[2] Enhanced security - minimum password length"
- Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]
Date: Thu, 14 Apr 2005 10:47:29 -0400 To: Tru64-UNIX-Managers@ornl.gov
Thanks to all who contributed. Below is the original question and following
that are the various contributions(with credit to their authors cited) that
I received in response.
Original Question:
> Tru64 5.1A and/or 5.1B.
>
> # hwmgr -view devices -cat disk
> HWID: Device Name Mfg Model Location
>
>
----------------------------------------------------------------------------
> --
> 123: /dev/disk/dsk1c COMPAQ HSV110 (C)COMPAQ IDENTIFIER=11
>
> # hwmgr -get attributes -a dev_base_name=dsk1 -a phys_location
> 123:
> dev_base_name = dsk1
> phys_location = IDENTIFIER=11
>
> Above are two samples of the use of the hwmgr utility to query a system to
> determine the 'location' (i.e. IDENTIFIER=11) associated with a specific
> device base name. I am currently writing a program in 'C' for which I
need
> a function which will programmatically obtain the above information.
>
> Loose Pseudo-code example of what I am looking for:
>
> struct hw_structure_definition *a
> a=some_routine_to_query_system_for_hw_info("dsk1")
> printf("%s\n",a->phys_location)
>
> Please note the above is pseudo-code - the text does not represent actual
> structure names, variable names or function names. I suspect that the
> functions I need are in existence but not documented in the normal man
pages
> (perhaps in the "Writing Device Drivers" manual?? which I do not have a
copy
> of for 5.1x stream)
>
> Over the phone HP support has indicated that they think it is going to
> involve some combination of the use of the table() function and the
ioctl()
> function. They are getting back to me on the specifics and I am
diligently
> reading through the man pages and querying my friends on tru64 managers
list
> in the meanwhile.
>
> Searching around the /usr/include/io/cam directory I found some
interesting
> function names that might relate to what I am looking for but without an
> associated man page I cannot be sure. Example: cam3.h
> xpt_get_phys_attribute().
>
> If anyone knows a function/routine and its associated calling standard
that
> would achieve the above I would be very appreciative.
>
> John Farmer, Senior Systems Programmer
> Tyco Healthcare/US Surgical
> 150 Glover Ave
> Norwalk, CT 06856
>
Contributions:-
Thanks to Doctor Thomas Blinn (as always!), Thomas Cunningham, Tom Linden,
and Bluejay Adametz for their contributions to my question. The summary is
as follows:
Dr. Blinn informed me that the the table() and ioctl() functions were not
what I was looking for. Instead, he advised that 1) The routines I would
need are actually a part of the hardware management subsystem library
routines. 2) The routines are particularly messy to use and that I would
have a bear of a time figuring them out unless I had examples (such as hwmgr
which calls them directly but alas, the sources are not available for
customer review). 3) Although not elegant I might be better off using the
system() function to pass it a hwmgr command and then parse the output. Dr.
Blinn has answered several of my questions in the past and has never lead me
wrong. It will be quite the prize if I can ever prove him incorrect or
mistaken on a technical topic!! I'm not holding my breath though.
Thomas Cunningham provided me with links to HP online documentation incuding
the manual titled writing device drivers. He provided me with an additional
set of links pointing to various device i/o functions. I am still digesting
the information on these pages but they are certainly a good read for anyone
working directly with hardware devices. The links are:
http://h30097.www3.hp.com/docs/dev_doc/DOCUMENTATION/HTML/DDK_R2/DOCS/HTML/M
AN/INDEXES/INDEX_D.HTM
http://h30097.www3.hp.com/docs/pub_page/doc_list.html
Bluejay Adametz suggested the same as Dr. Blinn that I make a call to the
hwmgr command and parse the output.
Tom Linden suggested that I use take a look at the getsysinfo() function.
Quite a good function with many useful applications but it did not have the
pieces of info I was looking for. He was also generous enough to provide a
program titled tiptoe.c which returned various pieces of information
regarding the hardware hierarchy.
An HP support person over the phone told me that he had a book with an
example of what I wanted to do but that he didn't have a soft copy to
provide me with. Additionally the relevant information was occupying more
than 50 pages so it was too much to fax. The title of this document is:
Writing Device Drivers for the SCSI/CAM Architecture Interfaces with a Part
Number of AA-PS3GD-TE. This book is apparently different from the "Writing
Device Drivers" book that I referenced above in the contribution from Tom
Cunningham.
Again, thanks to everyone who contributed.
John
Today must be Thursday. I never could get the hang of Thursdays...
--Arthur Dent - character from "The Hitchhikers Guide to the Galaxy"
- Previous message: Shaun.Racine_at_intier.com: "SUMMARY:[2] Enhanced security - minimum password length"
- Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]
Relevant Pages
|
|
