1// SPDX-License-Identifier: GPL-2.0
2// Copyright (c) 2019 Facebook
3#include <linux/bpf.h>
4#include <linux/version.h>
5#include <bpf/bpf_helpers.h>
6
7__u32 sig = 0, pid = 0, status = 0, signal_thread = 0;
8
9static __always_inline int bpf_send_signal_test(void *ctx)
10{
11	int ret;
12
13	if (status != 0 || pid == 0)
14		return 0;
15
16	if ((bpf_get_current_pid_tgid() >> 32) == pid) {
17		if (signal_thread)
18			ret = bpf_send_signal_thread(sig);
19		else
20			ret = bpf_send_signal(sig);
21		if (ret == 0)
22			status = 1;
23	}
24
25	return 0;
26}
27
28SEC("tracepoint/syscalls/sys_enter_nanosleep")
29int send_signal_tp(void *ctx)
30{
31	return bpf_send_signal_test(ctx);
32}
33
34SEC("tracepoint/sched/sched_switch")
35int send_signal_tp_sched(void *ctx)
36{
37	return bpf_send_signal_test(ctx);
38}
39
40SEC("perf_event")
41int send_signal_perf(void *ctx)
42{
43	return bpf_send_signal_test(ctx);
44}
45
46char __license[] SEC("license") = "GPL";
47