'fopen' successfully opens directories

[Sergei Steshenko]

Hello,

please see this:

"
GNU Octave, version 3.0.1b
[snip]
octave:1> fid = fopen("/tmp", "r")
fid =  3
octave:2> fread(fid, inf, "double")
ans = [](0x1)
"

- I would expect failure, i.e. negative 'fid', from 'fopen' in such a case.

Thanks,
  Sergei.

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