1 // SPDX-License-Identifier: GPL-2.0
2 /* Copyright (c) 2023 Meta Platforms, Inc. and affiliates. */
3 
4 #include <linux/bpf.h>
5 #include <time.h>
6 #include <errno.h>
7 #include <bpf/bpf_helpers.h>
8 #include "bpf_misc.h"
9 #include "bpf_tcp_helpers.h"
10 
11 char _license[] SEC("license") = "GPL";
12 
13 struct elem {
14 	struct bpf_timer t;
15 };
16 
17 struct {
18 	__uint(type, BPF_MAP_TYPE_ARRAY);
19 	__uint(max_entries, 1);
20 	__type(key, int);
21 	__type(value, struct elem);
22 } timer_map SEC(".maps");
23 
24 static int timer_cb_ret1(void *map, int *key, struct bpf_timer *timer)
25 {
26 	if (bpf_get_smp_processor_id() % 2)
27 		return 1;
28 	else
29 		return 0;
30 }
31 
32 SEC("fentry/bpf_fentry_test1")
33 __failure __msg("should have been in (0x0; 0x0)")
34 int BPF_PROG2(test_ret_1, int, a)
35 {
36 	int key = 0;
37 	struct bpf_timer *timer;
38 
39 	timer = bpf_map_lookup_elem(&timer_map, &key);
40 	if (timer) {
41 		bpf_timer_init(timer, &timer_map, CLOCK_BOOTTIME);
42 		bpf_timer_set_callback(timer, timer_cb_ret1);
43 		bpf_timer_start(timer, 1000, 0);
44 	}
45 
46 	return 0;
47 }
48