Issue #6399 has been updated by usa (Usaku NAKAMURA).

Category set to core
Target version set to next minor


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Feature #6399: IO.read ignores valid open_args on Windows
https://bugs.ruby-lang.org/issues/6399#change-32053

Author: djberg96 (Daniel Berger)
Status: Assigned
Priority: Normal
Assignee: usa (Usaku NAKAMURA)
Category: core
Target version: next minor


On Microsoft Windows the fopen function accepts many more modes than the standard function:

http://msdn.microsoft.com/en-us/library/yeby3zcb(v=vs.80).aspx

However, Ruby 1.9 doesn't appear to allow them:

# Try to force a sequential scan with 'S', for example
IO.read(file, open_args: ['rbS']) # => invalid access mode rbS (ArgumentError)

It looks like checks are being made manually in file.c and if they don't match the predetermined flags then an error is raised. I would submit that the flags should be allowed to be passed through, and fopen should fail on its own if they're invalid.


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