On 11/28/22 12:05, Marco A. Barra Montevechi Filho via Tech-talk wrote:
Thanks for the suggestion, Pedro!
At the end of the day, i figured that maybe autosave fdbrestore function would do what i wanted. Unfortunately, the function was resulting in segmentation fault. Looking in tech-talk i found this thread: https://epics.anl.gov/tech-talk/2014/msg01851.php <https://epics.anl.gov/tech-talk/2014/msg01851.php> which suggested that for autosave versions before 5.4.1 it is a known bug which is fixed after that. Since im using autosave 5-10-2 and the PVs are not very long, i gave up using autosave for this.
Could you provide any details which might go into a ticket?
Specific arguments used? ideally a stack trace? etc...
https://github.com/epics-modules/autosave/issues
I am indeed doing something similar to what you suggested: i created a file full of dbpf's and im trying to use the "execute" function of streamDevice to do a protocol file with:
call_file {
execute "< file_with_dbpfs.cmd";
}
And a PV in the form:
record(stringout, "$(P)$(R)UpdateConfig"){
field(DESC, "Filename from which to get values.")
field(OUT, "@iocsh_functions.proto call_file")
}
Untill now i had no success but it seems to be some silly mistake that i still didnt have time to debug.
Thanks,
Marco
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*From:* Nariyoshi, Pedro <nariyosh at frib.msu.edu>
*Sent:* 28 November 2022 13:50
*To:* Marco A. Barra Montevechi Filho <marco.filho at lnls.br>; tech-talk at aps.anl.gov <tech-talk at aps.anl.gov>
*Subject:* Re: How to: IOC reading information from file?
Hi Marco,
I don't know if there's a native functionality for this, but for some of our IOCs we use python to do some of these things. You can add something like "system 'python3 iocApp/py/script.py arguments &'" to the startup script. The script would do a camonitor 'MYRECORD:Output' and have a callback to read the file and do the respective actions. It's not as clean as your original proposition, but it should be faster to get running until you figure something a better solution.
*Pedro Nariyoshi*
Software Controls Engineer
Facility for Rare Isotope Beams
Michigan State University
640 South Shaw Lane
East Lansing, MI 48824, USA
Tel. 517-908-7352
Email: nariyosh at frib.msu.edu <mailto:nariyosh at frib.msu.edu>
1633986722804
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
*From:* Marco A. Barra Montevechi Filho <marco.filho at lnls.br>
*Sent:* Thursday, November 24, 2022 10:02 AM
*To:* tech-talk at aps.anl.gov
*Subject:* How to: IOC reading information from file?
*[EXTERNAL] This email originated from outside of FRIB*
Hello all.
I want to create a set of configuration files (probably json, yaml or even txt) that i can make my IOC read and put the values into PVs. I could swear i read something about reading configuration files in EPICS documentation before but i cant for the life of me find it again.
Desired functionality would be something like:
file config0.yaml has: {"my_var" : 0}
file config1.yaml has: {"my_var" : 1}
And then i would have a record, say MYRECORD:Output that when i do:
caput MYRECORD:Output "config0.yaml"
the record would output 0 to its output link. And
caput MYRECORD:Output "config1.yaml"
the record would output 1 to its output link.
Is there any module or record that offers similar functionality?
Thanks in advance,
Marco
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- Re: How to: IOC reading information from file? Michael Davidsaver via Tech-talk
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