/fd.rb Secret
Created
September 29, 2019 16:31
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| >> 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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