From: KOSAKI Motohiro <kosaki.motohiro@...>
Date: 2011-11-22T15:21:42+09:00
Subject: [ruby-core:41195] Re: IO.copy_stream creates files with restrictive permissions

>>> If I understand correctly, default umask don't allow world writable
>>> permission. Thus, if 0664 and 0666 make a different only when users
>>> changed umask intentionally. So, I don't think it's good idea to
>>> ignore it.
>>
>> I think the default umask is 0.
>>
>> http://www.bsdlover.cn/study/UnixTree/V7/usr/sys/h/param.h.html
>> #define � � � CMASK � 0 � � � � � � � /* default mask for file creation */
>>
>> What do you mean about default umask?
>
> The umask that almost every Unix distribution has always had in /etc/profile - which is 022.

Right.
I'm curious is there umask=0 platform in _modern_ OSs.