1 files changed, 23 insertions, 0 deletions
diff --git a/lib/ffi-xattr/error.rb b/lib/ffi-xattr/error.rb
new file mode 100644
index 0000000..602053d
--- /dev/null
+++ b/lib/ffi-xattr/error.rb
@@ -0,0 +1,23 @@
+class Xattr # :nodoc: all
+  module Error
+    extend FFI::Library
+
+    ffi_lib "c"
+
+    attach_function :strerror_r, [:int, :pointer, :size_t], :int unless RUBY_PLATFORM =~ /mingw/
+
+    class << self
+      def last
+        errno = FFI.errno
+        ptr = FFI::MemoryPointer.new(:char, 256)
+        strerror_r(errno, ptr, 256)
+
+        [ ptr.read_string, errno ]
+      end
+
+      def check(int)
+        raise SystemCallError.new(*last) if int != 0
+      end
+    end
+  end
+end