Subject: |
[Bug 1840500] Re: caget and cainfo return no data for any PV when one PV in arguments does not respond |
From: |
mdavidsaver via Core-talk <[email protected]> |
To: |
[email protected] |
Date: |
Sat, 17 Aug 2019 15:42:00 -0000 |
Confirmed. I hadn't noticed this.
@Bruce, Did you mean to say 'caget'? Current pvget et al. print values
as they arrive, and so don't have this issue.
** Changed in: epics-base
Status: New => Confirmed
** Also affects: epics-base/7.0
Importance: Undecided
Status: Confirmed
** Also affects: epics-base/3.15
Importance: Undecided
Status: New
** Also affects: epics-base/3.16
Importance: Undecided
Status: New
** Changed in: epics-base/3.16
Status: New => Won't Fix
** Changed in: epics-base/7.0
Importance: Undecided => Low
** Changed in: epics-base/3.16
Importance: Undecided => Low
** Changed in: epics-base/3.15
Importance: Undecided => Low
** Changed in: epics-base/3.15
Milestone: None => 3.15.7
** Changed in: epics-base/7.0
Milestone: None => 7.0.3.1
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https://bugs.launchpad.net/bugs/1840500
Title:
caget and cainfo return no data for any PV when one PV in arguments
does not respond
Status in EPICS Base:
Confirmed
Status in EPICS Base 3.15 series:
New
Status in EPICS Base 3.16 series:
Won't Fix
Status in EPICS Base 7.0 series:
Confirmed
Bug description:
Starting with EPICS 3.15.6, also in 3.16.* and 7.*, the cainfo and
caget tools no longer return information on any PV if one of the PVs
in a list does not respond. This is different from version 3.15.5 and
earlier, in which cainfo and caget would return information on all PVs
specified, noting those that did not respond.
Example caget in version 3.15.5:
$ caget Mu2e_Weather_1/temperature_degF
Mu2e_Weather_2/temperature_degF Mu2e_Weather_1/temperature_degC
Channel connect timed out: some PV(s) not found.
Mu2e_Weather_1/temperature_degF 82.1742
Mu2e_Weather_2/temperature_degF 80.615
Mu2e_Weather_1/temperature_degC *** not connected
Example caget in version 3.15.6:
$ caget Mu2e_Weather_1/temperature_degF Mu2e_Weather_2/temperature_degF
Mu2e_Weather_1/temperature_degC
Channel connect timed out: some PV(s) not found.
A similar difference is seen in cainfo. In 3.15.5, it will print out info for all the specified PVs, including "never connected" status for the missing PVs. In 3.15.6 and later, it just prints "some PV(s) not found."
This new behavior is less useful than the original behavior.
The cause of the change seems to be a small change in caget.c and
cainfo.c. Here is a diff, with "<" being 3.15.5 and ">" being 3.15.6.
544c544
< connect_pvs(pvs, nPvs);
---
> result = connect_pvs(pvs, nPvs);
547,548c547,548
<
< result = caget(pvs, nPvs, request, format, type, count);
---
> if (!result)
> result = caget(pvs, nPvs, request, format, type, count);
The identical change was made in cainfo.c.
The original behavior was preferable, but if there is some good reason
for not calling "caget" on PVs that failed to connect, then hopefully
there is some way of handling that in the caget() function rather than
just completely failing to do anything if even a single PV does not
respond.
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- References:
- [Bug 1840500] [NEW] caget and cainfo return no data for any PV when one PV in arguments does not respond Glenn Horton-Smith via Core-talk
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