[SAC-HELP] Fwd: Retrieving, setting and writing SAC blackboard variables in Fortran

[Brian Savage]

Fiona

This behavior using Fortran with the sacio.a library is a known one  
and only discovered about one month ago.  Hopefully this will be  
fixed in the next release.

A possible workaround is to include the C string terminator at the  
end of your character string in Fortran.  In C this character is '\0'  
and I believe it is char(0) in Fortran.

Cheers,
Brian


On Nov 1, 2006, at 9:21 AM, Fiona Darbyshire wrote:

> I'm having trouble with a Fortran program that I inherited, that  
> reads in information from a text file, makes some calculations, and  
> writes the results into an existing SAC blackboard file.
>
> The program appears to compile okay (though I have to use the -m32  
> option in the makefile as I've recently moved to a 64-bit Linux  
> platform). When I try to run it, however, it seems to be successful  
> in reading the blackboard file, but crashes with a "Segmentation  
> Fault" as soon as it gets to the first "setbbv" command. I've tried  
> writing a short test program or two with blackboard variables in  
> Fortran - seems that it's okay on subroutines such as "readbbf" and  
> "getbbv", but always gives a segmentation fault whenever I write  
> anything that includes a "setbbv".
>
> I tried looking at the example on the SAC2000 user manual, but am  
> none the wiser. Also having trouble understanding how the getbbv  
> subroutine retrieves the blackboard variables - no segmentation  
> faults, but I've yet to get a meaningful answer when I try to use  
> it on an existing BBFILE.
>
> Fiona Darbyshire.
>
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