66 lines
1.6 KiB
C
66 lines
1.6 KiB
C
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// SPDX-License-Identifier: GPL-2.0
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/* Copyright (c) 2021 Facebook */
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#include <test_progs.h>
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#include "test_legacy_printk.skel.h"
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static int execute_one_variant(bool legacy)
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{
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struct test_legacy_printk *skel;
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int err, zero = 0, my_pid = getpid(), res, map_fd;
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skel = test_legacy_printk__open();
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if (!ASSERT_OK_PTR(skel, "skel_open"))
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return -errno;
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bpf_program__set_autoload(skel->progs.handle_legacy, legacy);
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bpf_program__set_autoload(skel->progs.handle_modern, !legacy);
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err = test_legacy_printk__load(skel);
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/* no ASSERT_OK, we expect one of two variants can fail here */
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if (err)
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goto err_out;
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if (legacy) {
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map_fd = bpf_map__fd(skel->maps.my_pid_map);
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err = bpf_map_update_elem(map_fd, &zero, &my_pid, BPF_ANY);
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if (!ASSERT_OK(err, "my_pid_map_update"))
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goto err_out;
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err = bpf_map_lookup_elem(map_fd, &zero, &res);
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} else {
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skel->bss->my_pid_var = my_pid;
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}
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err = test_legacy_printk__attach(skel);
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if (!ASSERT_OK(err, "skel_attach"))
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goto err_out;
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usleep(1); /* trigger */
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if (legacy) {
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map_fd = bpf_map__fd(skel->maps.res_map);
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err = bpf_map_lookup_elem(map_fd, &zero, &res);
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if (!ASSERT_OK(err, "res_map_lookup"))
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goto err_out;
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} else {
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res = skel->bss->res_var;
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}
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if (!ASSERT_GT(res, 0, "res")) {
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err = -EINVAL;
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goto err_out;
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}
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err_out:
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test_legacy_printk__destroy(skel);
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return err;
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}
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void test_legacy_printk(void)
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{
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/* legacy variant should work everywhere */
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ASSERT_OK(execute_one_variant(true /* legacy */), "legacy_case");
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/* execute modern variant, can fail the load on old kernels */
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execute_one_variant(false);
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}
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