文件操作 - ffi_helper.rb

文件: /opt/puppetlabs/puppet/lib/ruby/vendor_ruby/facter/resolvers/bsd/ffi/ffi_helper.rb

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# frozen_string_literal: true

require 'ffi'

module Facter
  module Bsd
    module FfiHelper
      module Libc
        extend FFI::Library

ffi_lib 'c'
        attach_function :sysctl, %i[pointer uint pointer pointer pointer size_t], :int
      end

def self.sysctl(type, oids)
        name = FFI::MemoryPointer.new(:uint, oids.size)
        name.write_array_of_uint(oids)
        namelen = oids.size

oldp = FFI::Pointer::NULL
        oldlenp = FFI::MemoryPointer.new(:size_t)

newp = FFI::Pointer::NULL
        newlen = 0

if type == :string
          res = Libc.sysctl(name, namelen, oldp, oldlenp, newp, newlen)
          return nil if res.negative?
        else
          oldlenp.write(:size_t, FFI.type_size(type))
        end

oldp = FFI::MemoryPointer.new(:uint8_t, oldlenp.read(:size_t))
        res = Libc.sysctl(name, namelen, oldp, oldlenp, newp, newlen)
        return nil if res.negative?

case type
        when :string
          oldp.read_string
        else
          oldp.read(type)
        end
      end
    end
  end
end

文件操作 - ffi_helper.rb

文件: /opt/puppetlabs/puppet/lib/ruby/vendor_ruby/facter/resolvers/bsd/ffi/ffi_helper.rb

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