* io.c (io_reopen): discards read buffer. [ruby-core:24240]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@24144 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 3 insertions, 0 deletions

diff --git a/io.c b/io.c
index 9720145fc1..b1d985e4f5 100644
--- a/io.c
+++ b/io.c
@@ -5648,6 +5648,9 @@ io_reopen(VALUE io, VALUE nfile)
         if (io_fflush(fptr) < 0)
             rb_sys_fail(0);
     }
+    else {
+	io_tell(fptr);
+    }
 
     /* copy rb_io_t structure */
     fptr->mode = orig->mode | (fptr->mode & FMODE_PREP);