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gr33n7007h/fd.rb Secret

Created September 29, 2019 16:31
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fd.rb
>> require 'fcntl'
=> true
>>
>> f = File.open('/dev/urandom')
=> #<File:/dev/urandom>
>>
>> f.fcntl Fcntl::F_GETFL, 0
=> 32768
>>
>> f.read_nonblock 2
=> "\x88\x83"
>>
>> f.fcntl Fcntl::F_GETFL, 0
=> 34816
>>
>> 34816 - 32768 # 2048 = 04000 = non blocking flag
=> 2048
>>
>>
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