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pathconf 

        # IO.pathconf

(from ruby core)
---
    pathconf(p1)

---

Returns pathname configuration variable using fpathconf().

*name* should be a constant under `Etc` which begins with `PC_`.

The return value is an integer or nil. nil means indefinite limit. 
(fpathconf() returns -1 but errno is not set.)

    require 'etc'
    IO.pipe {|r, w|
      p w.pathconf(Etc::PC_PIPE_BUF) #=> 4096
    }

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