Problems with STREAM I/0

[Jerry DeLisle]

Steve Kargl wrote:
> Jerry,
> 
> I spent the day helping a colleague debug a problem with
> the STREAM IO feature.  I'm not sure if this is FreeBSD
> specific, but I thought I'd get your opinion before 
> filing a bug report.
> 
> Consider this code
> 
> program avl
>    implicit none
>    real dt, t, a(10)
>    integer i
>    dt = 1.e-6
>    a = real( (/ (i, i=1, 10) /) )
>    open(unit=11, file='a.dat', access='stream')
>    open(unit=12, file='b.dat', access='stream')
>    do i = 1, 10
>       t = i * dt
>       write(11) t
>       write(12) a
>    end do
>    close(11)
>    close(12)
> end program avl
> 
> The file a.dat should contain 10 REAL values and thus have
> a size of 40 bytes.  The file b.dat has 100 values and should
> have a size of 400.  What I actuall see is 
> 
> -rw-r--r--  1 kargl  kargl  - 396 Sep 12 17:04 a.dat
> -rw-r--r--  1 kargl  kargl  - 436 Sep 12 17:04 b.dat
> 
> It appears that write(11) and write(12) are both writing
> to both files.
> 
> Note, if I comment out the 'write(12) a' and erase the above files
> I see
> 
> node10:kargl[229] ll *dat
> -rw-r--r--  1 kargl  kargl  - 40 Sep 12 17:16 a.dat
> -rw-r--r--  1 kargl  kargl  -  0 Sep 12 17:16 b.dat
> 
> which is what I expect.
> 
Steve,

This is definitely a bug.  If I comment out one of the writes, the file length 
of the file resulting from the remaining write is the correct length. (Either 
one, 40 or 400)

Not good!

Jerry