[PATCH v6 10/15] selftests/nolibc: prepare: create /dev/zero

[Zhangjin Wu]

/dev/zero is commonly used to allocate anonymous memory, it is a very
good file for tests, let's prepare it.

Suggested-by: Willy Tarreau <w@xxxxxx>
Link: https://lore.kernel.org/lkml/20230702193306.GK16233@xxxxxx/
Signed-off-by: Zhangjin Wu <falcon@xxxxxxxxxxx>
---
 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 88b840f86f52..b759fb25d375 100644
--- a/tools/testing/selftests/nolibc/nolibc-test.c
+++ b/tools/testing/selftests/nolibc/nolibc-test.c
@@ -894,11 +894,13 @@ 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/null", &stat_buf) != 0 ||
+		    stat("/dev/zero", &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));
 			}
 		}
 	}
-- 
2.25.1