Feature #6399: IO.read ignores valid open_args on Windows

• Status: Feedback
• Assignee: usa (Usaku NAKAMURA)
• Target version: -

[djberg96 (Daniel Berger)]

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.

[djberg96 (Daniel Berger)]

Grr, should be "open_args".

[nobu (Nobuyoshi Nakada)]

• Tracker changed from Bug to Feature
• Subject changed from IO.read ignores valid command_args on Windows to IO.read ignores valid open_args on Windows

[nobu (Nobuyoshi Nakada)]

Of course, you mean "valid on Windows", I guess.

[mame (Yusuke Endoh)]

• Status changed from Open to Assigned
• Assignee set to usa (Usaku NAKAMURA)

[usa (Usaku NAKAMURA)]

I do not think that Ruby must support such non standard modes.
But if you can provide a patch to support them in other platforms,
your request may get more persuasive.

[usa (Usaku NAKAMURA)]

• Category set to core
• Target version set to 2.6

[usa (Usaku NAKAMURA)]

• Status changed from Assigned to Feedback

[naruse (Yui NARUSE)]

• Target version deleted (2.6)