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// SPDX-License-Identifier: GPL-2.0
/* Copyright (C) 2023. Huawei Technologies Co., Ltd */
#include <vmlinux.h>
#include <bpf/bpf_tracing.h>
#include <bpf/bpf_helpers.h>
#include "bpf_misc.h"
#include "bpf_experimental.h"
struct node_data {
__u64 data;
struct bpf_list_node node;
};
struct map_value {
struct bpf_list_head head __contains(node_data, node);
struct bpf_spin_lock lock;
};
struct inner_array_type {
__uint(type, BPF_MAP_TYPE_ARRAY);
__type(key, int);
__type(value, struct map_value);
__uint(max_entries, 1);
} inner_array SEC(".maps");
struct {
__uint(type, BPF_MAP_TYPE_ARRAY_OF_MAPS);
__uint(key_size, 4);
__uint(value_size, 4);
__uint(max_entries, 1);
__array(values, struct inner_array_type);
} outer_array SEC(".maps") = {
.values = {
[0] = &inner_array,
},
};
char _license[] SEC("license") = "GPL";
int pid = 0;
bool done = false;
SEC("fentry/" SYS_PREFIX "sys_nanosleep")
int add_to_list_in_inner_array(void *ctx)
{
struct map_value *value;
struct node_data *new;
struct bpf_map *map;
int zero = 0;
if (done || (u32)bpf_get_current_pid_tgid() != pid)
return 0;
map = bpf_map_lookup_elem(&outer_array, &zero);
if (!map)
return 0;
value = bpf_map_lookup_elem(map, &zero);
if (!value)
return 0;
new = bpf_obj_new(typeof(*new));
if (!new)
return 0;
bpf_spin_lock(&value->lock);
bpf_list_push_back(&value->head, &new->node);
bpf_spin_unlock(&value->lock);
done = true;
return 0;
}
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