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// SPDX-License-Identifier: GPL-2.0
/* Copyright (C) 2022. Huawei Technologies Co., Ltd */
#include <linux/bpf.h>
#include <bpf/bpf_helpers.h>
#include <bpf/bpf_tracing.h>
char _license[] SEC("license") = "GPL";
struct {
__uint(type, BPF_MAP_TYPE_HASH);
__uint(max_entries, 1);
__uint(key_size, sizeof(__u32));
__uint(value_size, sizeof(__u32));
} htab SEC(".maps");
int pid = 0;
int update_err = 0;
SEC("?fentry/lookup_elem_raw")
int lookup_elem_raw(void *ctx)
{
__u32 key = 0, value = 1;
if ((bpf_get_current_pid_tgid() >> 32) != pid)
return 0;
update_err = bpf_map_update_elem(&htab, &key, &value, 0);
return 0;
}
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