dd bug fix: accept e.g., if=/dev/stdin and of=/dev/stdout

* lib/fd-reopen.c: Work even if FILE is "/dev/stdin".
Problem reported by Geoffrey Lee in <http://bugs.debian.org/290727>.
* tests/dd/misc: Check for this bug.

1 files changed, 7 insertions, 0 deletions

diff --git a/tests/dd/misc b/tests/dd/misc
index 917258236..2b54cfb36 100755
--- a/tests/dd/misc
+++ b/tests/dd/misc
@@ -46,6 +46,13 @@ if dd oflag=append if=$tmp_in of=$tmp_out 2> /dev/null; then
   compare $tmp_in $tmp_out || fail=1
 fi
 
+case $(cat /dev/stdin <$tmp_in 2>/dev/null) in
+(data)
+  rm -f $tmp_out
+  dd if=/dev/stdin of=$tmp_out <$tmp_in || fail=1
+  compare $tmp_in $tmp_out || fail=1
+esac
+
 if dd iflag=nofollow if=$tmp_in count=0 2> /dev/null; then
   dd iflag=nofollow if=$tmp_sym count=0 2> /dev/null && fail=1
 fi