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// SPDX-License-Identifier: GPL-2.0
// Copyright (c) 2019 Facebook
#include <linux/bpf.h>
#include <linux/version.h>
#include "bpf_helpers.h"
struct bpf_map_def SEC("maps") info_map = {
.type = BPF_MAP_TYPE_ARRAY,
.key_size = sizeof(__u32),
.value_size = sizeof(__u64),
.max_entries = 1,
};
BPF_ANNOTATE_KV_PAIR(info_map, __u32, __u64);
struct bpf_map_def SEC("maps") status_map = {
.type = BPF_MAP_TYPE_ARRAY,
.key_size = sizeof(__u32),
.value_size = sizeof(__u64),
.max_entries = 1,
};
BPF_ANNOTATE_KV_PAIR(status_map, __u32, __u64);
SEC("send_signal_demo")
int bpf_send_signal_test(void *ctx)
{
__u64 *info_val, *status_val;
__u32 key = 0, pid, sig;
int ret;
status_val = bpf_map_lookup_elem(&status_map, &key);
if (!status_val || *status_val != 0)
return 0;
info_val = bpf_map_lookup_elem(&info_map, &key);
if (!info_val || *info_val == 0)
return 0;
sig = *info_val >> 32;
pid = *info_val & 0xffffFFFF;
if ((bpf_get_current_pid_tgid() >> 32) == pid) {
ret = bpf_send_signal(sig);
if (ret == 0)
*status_val = 1;
}
return 0;
}
char __license[] SEC("license") = "GPL";
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