selftests/nolibc: Add coverage of vfork()

Generalise the existing fork() test to also cover the newly added vfork()
implementation.

Signed-off-by: Mark Brown <broonie@kernel.org>
Link: https://lore.kernel.org/r/20250703-arm64-gcs-vfork-exit-v3-4-1e9a9d2ddbbe@kernel.org
Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>

diff --git a/tools/testing/selftests/nolibc/nolibc-test.c b/tools/testing/selftests/nolibc/nolibc-test.c
index 52640d8ae402b9e34174ae798e74882ca750ec2b..b5bca1dcf36e95a576ca9ffba4f7c213978a3f35 100644 (file)
--- a/tools/testing/selftests/nolibc/nolibc-test.c
+++ b/tools/testing/selftests/nolibc/nolibc-test.c
@@ -877,7 +877,12 @@ int test_file_stream(void)
        return 0;
 }
 
-int test_fork(void)
+enum fork_type {
+       FORK_STANDARD,
+       FORK_VFORK,
+};
+
+int test_fork(enum fork_type type)
 {
        int status;
        pid_t pid;
@@ -886,14 +891,23 @@ int test_fork(void)
        fflush(stdout);
        fflush(stderr);
 
-       pid = fork();
+       switch (type) {
+       case FORK_STANDARD:
+               pid = fork();
+               break;
+       case FORK_VFORK:
+               pid = vfork();
+               break;
+       default:
+               return 1;
+       }
 
        switch (pid) {
        case -1:
                return 1;
 
        case 0:
-               exit(123);
+               _exit(123);
 
        default:
                pid = waitpid(pid, &status, 0);
@@ -1330,7 +1344,7 @@ int run_syscall(int min, int max)
                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(file_stream);       EXPECT_SYSZR(1, test_file_stream()); break;
-               CASE_TEST(fork);              EXPECT_SYSZR(1, test_fork()); break;
+               CASE_TEST(fork);              EXPECT_SYSZR(1, test_fork(FORK_STANDARD)); 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(directories);       EXPECT_SYSZR(proc, test_dirent()); break;
@@ -1374,6 +1388,7 @@ int run_syscall(int min, int max)
                CASE_TEST(uname_fault);       EXPECT_SYSER(1, uname(NULL), -1, EFAULT); break;
                CASE_TEST(unlink_root);       EXPECT_SYSER(1, unlink("/"), -1, EISDIR); break;
                CASE_TEST(unlink_blah);       EXPECT_SYSER(1, unlink("/proc/self/blah"), -1, ENOENT); break;
+               CASE_TEST(vfork);             EXPECT_SYSZR(1, test_fork(FORK_VFORK)); break;
                CASE_TEST(wait_child);        EXPECT_SYSER(1, wait(&tmp), -1, ECHILD); break;
                CASE_TEST(waitpid_min);       EXPECT_SYSER(1, waitpid(INT_MIN, &tmp, WNOHANG), -1, ESRCH); break;
                CASE_TEST(waitpid_child);     EXPECT_SYSER(1, waitpid(getpid(), &tmp, WNOHANG), -1, ECHILD); break;