[PATCH v2 nolibc 14/15] tools/nolibc: add testcase for fork()/waitpid()

Paul E. McKenney
2023-05-18T14:56:00Z

On s390 the arguments to clone() which is used by fork() are different
than other archs.
Make sure everything works correctly.

Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
Signed-off-by: Willy Tarreau <w@1wt.eu>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
---
tools/testing/selftests/nolibc/nolibc-test.c | 20 ++++++++++++++++++++
1 file changed, 20 insertions(+)

diff --git a/tools/testing/selftests/nolibc/nolibc-test.c b/tools/testing/selftests/nolibc/nolibc-test.c
index f06b38cfe38a..f042a6436b6b 100644
--- a/tools/testing/selftests/nolibc/nolibc-test.c
+++ b/tools/testing/selftests/nolibc/nolibc-test.c
@@ -474,6 +474,25 @@ static int test_getpagesize(void)
return !c;
}

+static int test_fork(void)
+{
+ int status;
+ pid_t pid = fork();
+
+ switch (pid) {
+ case -1:
+ return 1;
+
+ case 0:
+ exit(123);
+
+ default:
+ pid = waitpid(pid, &status, 0);
+
+ return pid == -1 || !WIFEXITED(status) || WEXITSTATUS(status) != 123;
+ }
+}
+
/* Run syscall tests between IDs <min> and <max>.
* Return 0 on success, non-zero on failure.
*/
@@ -530,6 +549,7 @@ int run_syscall(int min, int max)
CASE_TEST(dup3_0); tmp = dup3(0, 100, 0); EXPECT_SYSNE(1, tmp, -1); close(tmp); break;
CASE_TEST(dup3_m1); tmp = dup3(-1, 100, 0); EXPECT_SYSER(1, tmp, -1, EBADF); if (tmp != -1) close(tmp); break;
CASE_TEST(execve_root); EXPECT_SYSER(1, execve("/", (char*[]){ [0] = "/", [1] = NULL }, NULL), -1, EACCES); break;
+ CASE_TEST(fork); EXPECT_SYSZR(1, test_fork()); break;
CASE_TEST(getdents64_root); EXPECT_SYSNE(1, test_getdents64("/"), -1); break;
CASE_TEST(getdents64_null); EXPECT_SYSER(1, test_getdents64("/dev/null"), -1, ENOTDIR); break;
CASE_TEST(gettimeofday_null); EXPECT_SYSZR(1, gettimeofday(NULL, NULL)); break;
--
2.40.1