* io.c (io_fillbuf): show fd number on failure to debug.

  http://c5632.rubyci.org/~chkbuild/ruby-trunk/log/20130316T050302Z.diff.html.gz

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@39803 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 7 insertions, 1 deletions

diff --git a/io.c b/io.c
index 8d70ed41c6..eb8b80c63b 100644
--- a/io.c
+++ b/io.c
@@ -1657,7 +1657,13 @@ io_fillbuf(rb_io_t *fptr)
         if (r < 0) {
             if (rb_io_wait_readable(fptr->fd))
                 goto retry;
-            rb_sys_fail_path(fptr->pathv);
+	    {
+		VALUE path = rb_sprintf("fd:%d ", fptr->fd);
+		if (!NIL_P(fptr->pathv)) {
+		    rb_str_append(path, fptr->pathv);
+		}
+		rb_sys_fail_path(path);
+	    }
         }
         fptr->rbuf.off = 0;
         fptr->rbuf.len = (int)r; /* r should be <= rbuf_capa */