root/tools/testing/selftests/bpf/prog_tests/reference_tracking.c
// SPDX-License-Identifier: GPL-2.0
#include <test_progs.h>

void test_reference_tracking(void)
{
        const char *file = "test_sk_lookup_kern.bpf.o";
        const char *obj_name = "ref_track";
        DECLARE_LIBBPF_OPTS(bpf_object_open_opts, open_opts,
                .object_name = obj_name,
                .relaxed_maps = true,
        );
        struct bpf_object *obj_iter, *obj = NULL;
        struct bpf_program *prog;
        __u32 duration = 0;
        int err = 0;

        obj_iter = bpf_object__open_file(file, &open_opts);
        if (!ASSERT_OK_PTR(obj_iter, "obj_iter_open_file"))
                return;

        if (CHECK(strcmp(bpf_object__name(obj_iter), obj_name), "obj_name",
                  "wrong obj name '%s', expected '%s'\n",
                  bpf_object__name(obj_iter), obj_name))
                goto cleanup;

        bpf_object__for_each_program(prog, obj_iter) {
                struct bpf_program *p;
                const char *name;

                name = bpf_program__name(prog);
                if (!test__start_subtest(name))
                        continue;

                obj = bpf_object__open_file(file, &open_opts);
                if (!ASSERT_OK_PTR(obj, "obj_open_file"))
                        goto cleanup;

                /* all programs are not loaded by default, so just set
                 * autoload to true for the single prog under test
                 */
                p = bpf_object__find_program_by_name(obj, name);
                bpf_program__set_autoload(p, true);

                /* Expect verifier failure if test name has 'err' */
                if (strncmp(name, "err_", sizeof("err_") - 1) == 0) {
                        libbpf_print_fn_t old_print_fn;

                        old_print_fn = libbpf_set_print(NULL);
                        err = !bpf_object__load(obj);
                        libbpf_set_print(old_print_fn);
                } else {
                        err = bpf_object__load(obj);
                }
                ASSERT_OK(err, name);

                bpf_object__close(obj);
                obj = NULL;
        }

cleanup:
        bpf_object__close(obj);
        bpf_object__close(obj_iter);
}