From: oech3 <79379754+oech3@users.noreply.github.com>
Date: Tue, 31 Mar 2026 06:57:58 +0000 (+0900)
Subject: tests: dd: check that erroneous seeks are not done in output
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=ee5092971ec8ce233f656445b81bde75e1fa9a3d;p=thirdparty%2Fcoreutils.git

tests: dd: check that erroneous seeks are not done in output

* tests/dd/misc.sh: Add test case for of=/dev/tty.
The same occurs for /dev/stdout, but that varies
in the test hardness so is best avoided.
https://github.com/coreutils/coreutils/pull/234
---

diff --git a/tests/dd/misc.sh b/tests/dd/misc.sh
index ad13d22086..e6559bf168 100755
--- a/tests/dd/misc.sh
+++ b/tests/dd/misc.sh
@@ -124,4 +124,10 @@ dd if=$tmp_in of=$tmp_out count=00x$big status=noxfer 2>err || fail=1
 compare /dev/null $tmp_out || fail=1
 compare err_ok err || fail=1
 
+# Ensure of=/dev/tty is possible
+if test -c /dev/tty && test -w /dev/tty; then
+  dd if=/dev/null of=/dev/tty || fail=1
+fi
+
+
 Exit $fail