* io.c (copy_stream_fallback_body): check nil for EOF of read method.

  patch by Eric Wong.  [ruby-core:39134] [Bug #5237]


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@33515 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 4 insertions, 1 deletions

diff --git a/io.c b/io.c
index c9a33f3aad..15e2ec982b 100644
--- a/io.c
+++ b/io.c
@@ -8998,7 +8998,10 @@ copy_stream_fallback_body(VALUE arg)
             l = buflen < rest ? buflen : (long)rest;
         }
         if (stp->src_fd == -1) {
-            rb_funcall(stp->src, read_method, 2, INT2FIX(l), buf);
+            VALUE rc = rb_funcall(stp->src, read_method, 2, INT2FIX(l), buf);
+
+            if (read_method == id_read && NIL_P(rc))
+                break;
         }
         else {
             ssize_t ss;