kgio_read returns nil on EOF

Just like IO#read

4 files changed, 3 insertions, 5 deletions

diff --git a/TODO b/TODO
index 5ffcdb9..799d9f3 100644
--- a/TODO
+++ b/TODO
@@ -1,5 +1,3 @@
 * more API documentation
 
-* return (instead of raise) EOFError?
-
 * SSL/TLS support
diff --git a/ext/kgio/kgio_ext.c b/ext/kgio/kgio_ext.c
index d0632e3..f2d30ba 100644
--- a/ext/kgio/kgio_ext.c
+++ b/ext/kgio/kgio_ext.c
@@ -114,7 +114,7 @@ static int read_check(struct io_args *a, long n, const char *msg)
         }
         rb_str_set_len(a->buf, n);
         if (n == 0)
-                rb_eof_error();
+                a->buf = Qnil;
         return 0;
 }
 
diff --git a/test/lib_read_write.rb b/test/lib_read_write.rb
index 897e6b2..18f13f0 100644
--- a/test/lib_read_write.rb
+++ b/test/lib_read_write.rb
@@ -16,7 +16,7 @@ module LibReadWriteTest
 
   def test_read_eof
     @wr.close
-    assert_raises(EOFError) { @rd.kgio_read 5 }
+    assert_nil @rd.kgio_read(5)
   end
 
   def test_write_closed
diff --git a/test/test_pipe_popen.rb b/test/test_pipe_popen.rb
index af72032..1f56979 100644
--- a/test/test_pipe_popen.rb
+++ b/test/test_pipe_popen.rb
@@ -9,6 +9,6 @@ class TestPipePopen < Test::Unit::TestCase
     assert_equal Kgio::WaitReadable, io.kgio_read(2)
     sleep 1.5
     assert_equal "HI\n", io.kgio_read(3)
-    assert_raises(EOFError) { io.kgio_read 5 }
+    assert_nil io.kgio_read(5)
   end
 end