linux-kernel - [PATCH 1/2] selftests/nolibc: create /dev/full when running as PID 1

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Message-Id: <20250704-nolibc-printf-error-v1-1-74b7a092433b@linutronix.de>
Date: Fri, 04 Jul 2025 15:43:12 +0200
From: Thomas Weißschuh <thomas.weissschuh@...utronix.de>
To: Willy Tarreau <w@....eu>, 
 Thomas Weißschuh <linux@...ssschuh.net>, 
 Shuah Khan <shuah@...nel.org>, "Paul E. McKenney" <paulmck@...nel.org>
Cc: linux-kselftest@...r.kernel.org, linux-kernel@...r.kernel.org, 
 Thomas Weißschuh <thomas.weissschuh@...utronix.de>
Subject: [PATCH 1/2] selftests/nolibc: create /dev/full when running as PID
 1

An upcoming testcase will use /dev/full.

Make sure it is always present.

Signed-off-by: Thomas Weißschuh <thomas.weissschuh@...utronix.de>
---
 tools/testing/selftests/nolibc/nolibc-test.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/tools/testing/selftests/nolibc/nolibc-test.c b/tools/testing/selftests/nolibc/nolibc-test.c
index b5bca1dcf36e95a576ca9ffba4f7c213978a3f35..929b966099b369aeca6d43002ebb0a160674dddc 100644
--- a/tools/testing/selftests/nolibc/nolibc-test.c
+++ b/tools/testing/selftests/nolibc/nolibc-test.c
@@ -1777,12 +1777,14 @@ int prepare(void)
 	if (stat("/dev/.", &stat_buf) == 0 || mkdir("/dev", 0755) == 0) {
 		if (stat("/dev/console", &stat_buf) != 0 ||
 		    stat("/dev/null", &stat_buf) != 0 ||
-		    stat("/dev/zero", &stat_buf) != 0) {
+		    stat("/dev/zero", &stat_buf) != 0 ||
+		    stat("/dev/full", &stat_buf) != 0) {
 			/* try devtmpfs first, otherwise fall back to manual creation */
 			if (mount("/dev", "/dev", "devtmpfs", 0, 0) != 0) {
 				mknod("/dev/console", 0600 | S_IFCHR, makedev(5, 1));
 				mknod("/dev/null",    0666 | S_IFCHR, makedev(1, 3));
 				mknod("/dev/zero",    0666 | S_IFCHR, makedev(1, 5));
+				mknod("/dev/full",    0666 | S_IFCHR, makedev(1, 7));
 			}
 		}
 	}

-- 
2.50.0