Hi Mark,
A quick check on Linux (3.14.12.2 w/o additional patches, using caput -S
to change a softIOC wf record) shows slightly different behavior,
leaving a better impression:
> ./projects/epics/base/3.14/3-14-12-2/bin/linux-x86_64/camonitor
iocImageFilePath
iocImageFilePath 2012-09-10 22:44:40.415229 17 48 49 50 51 52 53 54 55
56 57 97 98 99 97 98 99 0
iocImageFilePath 2012-09-10 22:45:10.335328 16 48 49 50 51 52 53 54 55
56 57 97 98 99 97 98 0
iocImageFilePath 2012-09-10 22:45:13.694734 15 48 49 50 51 52 53 54 55
56 57 97 98 99 97 0
iocImageFilePath 2012-09-10 22:45:17.030678 14 48 49 50 51 52 53 54 55
56 57 97 98 99 0
> ./projects/epics/base/3.14/3-14-12-2/bin/linux-x86_64/camonitor -S
iocImageFilePath
iocImageFilePath 2012-09-10 23:08:31.703178 0123456789abcabc
iocImageFilePath 2012-09-10 23:08:36.974504 0123456789abcab
iocImageFilePath 2012-09-10 23:08:39.830474 0123456789abca
iocImageFilePath 2012-09-10 23:08:43.006382 0123456789abc
Note that the trailing \0 is part of the array in my case, but not in yours.
Assuming reused buffers in the client, that would explain the additional
characters (old buffer contents) when printed as %s.
How do you update your waveform record? Do you include the \0?
@Andrew: How is "string as array of char" supposed to be used? Is the
trailing \0 being part of the array the correct way?
Thanks,
~Ralph
On 03.09.2012 22:45, Mark Rivers wrote:
> Hi Ralph,
>
> On a closely related topic, there appears to be a bug in "camonitor -S" in 3.14.12.2.
>
> I have a waveform record that contains a file path and name. If I make the string one character shorter each time the record processes then "caget -S" works fine:
>
> The following is the output when I shorten the base file name from "abcdef", to "abcde" to "abcd" to "abc".
>
> corvette:~/devel/quadEM/documentation>caget -S 13SIM1:netCDF1:FullFileName_RBV
> 13SIM1:netCDF1:FullFileName_RBV /home/epics/scratch/abcdef_643.nc
> corvette:~/devel/quadEM/documentation>caget -S 13SIM1:netCDF1:FullFileName_RBV
> 13SIM1:netCDF1:FullFileName_RBV /home/epics/scratch/abcde_644.nc
> corvette:~/devel/quadEM/documentation>caget -S 13SIM1:netCDF1:FullFileName_RBV
> 13SIM1:netCDF1:FullFileName_RBV /home/epics/scratch/abcd_645.nc
> corvette:~/devel/quadEM/documentation>caget -S 13SIM1:netCDF1:FullFileName_RBV
> 13SIM1:netCDF1:FullFileName_RBV /home/epics/scratch/abc_646.nc
>
> camonitor also works fine if I read it as a byte array:
>
> corvette:~/devel/quadEM/documentation>camonitor 13SIM1:netCDF1:FullFileName_RBV
> 13SIM1:netCDF1:FullFileName_RBV 2012-09-03 15:38:44.323680 33 47 104 111 109 101 47 101 112 105 99 115 47 115 99 114 97 116 99 104 47 97 98 99 100 101 102 95 54 52 55 46 110 99
> 13SIM1:netCDF1:FullFileName_RBV 2012-09-03 15:38:51.749183 32 47 104 111 109 101 47 101 112 105 99 115 47 115 99 114 97 116 99 104 47 97 98 99 100 101 95 54 52 56 46 110 99
> 13SIM1:netCDF1:FullFileName_RBV 2012-09-03 15:38:57.862994 31 47 104 111 109 101 47 101 112 105 99 115 47 115 99 114 97 116 99 104 47 97 98 99 100 95 54 52 57 46 110 99
> 13SIM1:netCDF1:FullFileName_RBV 2012-09-03 15:39:01.644249 30 47 104 111 109 101 47 101 112 105 99 115 47 115 99 114 97 116 99 104 47 97 98 99 95 54 53 48 46 110 99
>
> However, if I do camonitor -S it does not work correctly:
>
> corvette:~/devel/quadEM/documentation>camonitor -S 13SIM1:netCDF1:FullFileName_RBV
> 13SIM1:netCDF1:FullFileName_RBV 2012-09-03 15:40:04.275117 /home/epics/scratch/abcdef_651.nc
> 13SIM1:netCDF1:FullFileName_RBV 2012-09-03 15:40:10.385085 /home/epics/scratch/abcde_652.ncc
> 13SIM1:netCDF1:FullFileName_RBV 2012-09-03 15:40:17.546130 /home/epics/scratch/abc_653.ncncc
>
> Note that it is showing extra characters at the end of the string.
>
> However, if I exit camonitor and run it again with the last string unchanged it displays that string correctly:
>
> corvette:~/devel/quadEM/documentation>camonitor -S 13SIM1:netCDF1:FullFileName_RBV
> 13SIM1:netCDF1:FullFileName_RBV 2012-09-03 15:40:17.546130 /home/epics/scratch/abc_653.nc
>
> medm correctly displays the string as it gets shortened.
>
> Mark
>
- Replies:
- RE: camonitor bug for string as array of chars Mark Rivers
- References:
- caput off-by-one bug for string as array of chars J. Lewis Muir
- Re: caput off-by-one bug for string as array of chars Ralph Lange
- RE: caput off-by-one bug for string as array of chars Mark Rivers
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