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Bug #12467

Updated by nobu (Nobuyoshi Nakada) over 3 years ago

Example:

~~~ruby


~~~

spawn 'ruby -e "p Time.now"', [:out, :err] => ['log.txt', 'a']
sleep 1
spawn 'ruby -e "p Time.now"', [:out, :err] => ['log.txt', 'a']
sleep 1
p File.read('log.txt')
~~~

This program looks work correctly at first.



~~~
c:\>ruby spawn_bug.rb
"2016-06-07 18:47:25 +0900\n2016-06-07 18:28:17 +0900\n"
~~~

However, when I run it again, the log file is truncated like 'w' flag.

~~~
c:\>ruby spawn_bug.rb
"2016-06-07 18:47:38 +0900\n2016-06-07 18:28:17 +0900\n"
~~~

This is the same if I open the log file manually with File.open.

~~~ruby ~~~
f = File.open('log.txt', 'a')
spawn 'ruby -e "p Time.now"', [:out, :err] => f
sleep 1
spawn 'ruby -e "p Time.now"', [:out, :err] => f
sleep 1
p File.read('log.txt')
~~~

I tried this on Windows 10. (Also confirmed this does not happen on Mac OS X 10.11 + ruby 2.2)

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