ffi_helper.rb in facter-4.0.34

- old
+ new

@@ -6,11 +6,30 @@
   module Freebsd
     module FfiHelper
       module Libc
         extend FFI::Library
 
+        KENV_GET = 0
+
+        KENV_MVALLEN = 128
+
         ffi_lib 'c'
+        attach_function :kenv, %i[int string pointer int], :int
         attach_function :sysctlbyname, %i[string pointer pointer pointer size_t], :int
+      end
+
+      def self.kenv(action, name, value = nil)
+        case action
+        when :get
+          len = Libc::KENV_MVALLEN + 1
+          value = FFI::MemoryPointer.new(:char, len)
+          res = Libc.kenv(Libc::KENV_GET, name, value, len)
+          return nil if res.negative?
+
+          value.read_string(res).chomp("\0")
+        else
+          raise "Action #{action} not supported"
+        end
       end
 
       def self.sysctl_by_name(type, name)
         oldp = FFI::Pointer::NULL
         oldlenp = FFI::MemoryPointer.new(:size_t)