selftests/nolibc: test open mode handling

Add a selftest for the new O_TMPFILE open mode handling.
While O_CREAT or openat() are not tested, the code is the same,
so assume these also work.

Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
Acked-by: Willy Tarreau <w@1wt.eu>
Link: https://patch.msgid.link/20260514-nolibc-open-tmpfile-v2-4-b4c6c5efa266@weissschuh.net

diff --git a/tools/testing/selftests/nolibc/nolibc-test.c b/tools/testing/selftests/nolibc/nolibc-test.c
index 1db6e8d55c16fbc56e3986c70de99879296a569c..c3867cc570c6cee90d97b7ff342829c74265b875 100644 (file)
--- a/tools/testing/selftests/nolibc/nolibc-test.c
+++ b/tools/testing/selftests/nolibc/nolibc-test.c
@@ -1305,6 +1305,28 @@ int test_openat(void)
        return 0;
 }
 
+int test_open_mode(void)
+{
+       const mode_t mode = 0444;
+       struct stat stat_buf;
+       int fd, ret;
+
+       fd = open("/tmp", O_TMPFILE | O_RDWR, mode);
+       if (fd == -1)
+               return -1;
+
+       ret = fstat(fd, &stat_buf);
+       close(fd);
+
+       if (ret == -1)
+               return -1;
+
+       if ((stat_buf.st_mode & 0777) != mode)
+               return -1;
+
+       return 0;
+}
+
 int test_nolibc_enosys(void)
 {
        if (true)
@@ -1540,6 +1562,7 @@ int run_syscall(int min, int max)
                CASE_TEST(open_tty);          EXPECT_SYSNE(1, tmp = open("/dev/null", O_RDONLY), -1); if (tmp != -1) close(tmp); break;
                CASE_TEST(open_blah);         EXPECT_SYSER(1, tmp = open("/proc/self/blah", O_RDONLY), -1, ENOENT); if (tmp != -1) close(tmp); break;
                CASE_TEST(openat_dir);        EXPECT_SYSZR(1, test_openat()); break;
+               CASE_TEST(open_mode);         EXPECT_SYSZR(1, test_open_mode()); break;
                CASE_TEST(pipe);              EXPECT_SYSZR(1, test_pipe()); break;
                CASE_TEST(poll_null);         EXPECT_SYSZR(1, poll(NULL, 0, 0)); break;
                CASE_TEST(poll_stdout);       EXPECT_SYSNE(1, ({ struct pollfd fds = { 1, POLLOUT, 0}; poll(&fds, 1, 0); }), -1); break;