[Rd] Possible bug, Rprof() and scan(pipe()) (PR#1140)

[macq@llnl.gov]

This looks like a bug?
Unable to use scan(pipe()) while profiling.
I have no idea whether this version of R violates the
    "do not use `Rprof' in an executable built for profiling"
warning in ?Rprof.

Thanks
-Don

>  version
          _
platform powerpc-apple-darwin1.4
arch     powerpc
os       darwin1.4
system   powerpc, darwin1.4
status   Patched
major    1
minor    3.1
year     2001
month    10
day      15
language R
>
>  foo <- scan(pipe('ls -1 | head -3'),what='')
Read 3 items
>  foo
[1] "README"      "RMfiles.dat" "RMfiles.tmp"
>  Rprof()
>  foo <- scan(pipe('ls -1 | head -3'),what='')
Read 0 items
>  foo
character(0)
>  Rprof(NULL)
>  foo <- scan(pipe('ls -1 | head -3'),what='')
Read 3 items
>

note, profiling does appear to be functional:
>  Rprof() ; hist(rnorm(10000)) ; Rprof(NULL)
>  system('R CMD Rprof Rprof.out')

Each sample represents 0.02 seconds.
Total run time: 0.1 seconds.

Total seconds: time spent in function and callees.
Self seconds: time spent in function alone.

    %       total       %       self
  total    seconds     self    seconds    name
100.00      0.10      0.00      0.00     "hist"
  60.00      0.06      0.00      0.00     "hist.default"
  40.00      0.04     40.00      0.04     "rnorm"
  40.00      0.04      0.00      0.00     "plot"
  40.00      0.04      0.00      0.00     "plot.histogram"
  20.00      0.02      0.00      0.00     "storage.mode<-"
  20.00      0.02     20.00      0.02     "X11"
  20.00      0.02      0.00      0.00     "paste"
  20.00      0.02      0.00      0.00     "rect"
  20.00      0.02      0.00      0.00     "plot.new"
  20.00      0.02     20.00      0.02     "seq.default"
  20.00      0.02      0.00      0.00     "seq"
  20.00      0.02     20.00      0.02     "par"

    %       self        %       total
  self     seconds    total    seconds    name
  40.00      0.04     40.00      0.04     "rnorm"
  20.00      0.02     20.00      0.02     "X11"
  20.00      0.02     20.00      0.02     "seq.default"
  20.00      0.02     20.00      0.02     "par"

-- 
--------------------------------------
Don MacQueen
Environmental Protection Department
Lawrence Livermore National Laboratory
Livermore, CA, USA
--------------------------------------

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