libbpf-rs 0.26.2

libbpf-rs is a safe, idiomatic, and opinionated wrapper around libbpf-sys
Documentation 
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// SPDX-License-Identifier: GPL-2.0

#include "vmlinux.h"
#include <bpf/bpf_helpers.h>

struct {
    __uint(type, BPF_MAP_TYPE_HASH);
    __uint(max_entries, 2);
    __type(key, int);
    __type(value, int);
} hash_map SEC(".maps");

SEC("uprobe.multi")
int handle__uprobe_multi(void *ctx)
{
    const int key = 0, init_val = 1;

    int *val = bpf_map_lookup_elem(&hash_map, &key);
    if (val) {
        __sync_fetch_and_add(val, 1);
        bpf_printk("handle__uprobe_multi: val=%d\n", *val);
    } else {
        bpf_map_update_elem(&hash_map, &key, &init_val, BPF_ANY);
    }

    return 0;
}

SEC("uprobe.multi")
int handle__uprobe_multi_with_opts(void *ctx)
{
    const int key = 1, init_val = 1;

    int *val = bpf_map_lookup_elem(&hash_map, &key);
    if (val) {
        __sync_fetch_and_add(val, 1);
        bpf_printk("handle__uprobe_multi_with_opts: val=%d\n", *val);
    } else {
        bpf_map_update_elem(&hash_map, &key, &init_val, BPF_ANY);
    }

    return 0;
}

SEC("uprobe.multi")
int handle__uprobe_multi_with_non_default_opts(void *ctx)
{
    const int key = 1, init_val = 1;

    int *val = bpf_map_lookup_elem(&hash_map, &key);
    if (val) {
        __sync_fetch_and_add(val, 1);
        bpf_printk("handle__uprobe_multi_with_non_default_opts: val=%d\n",
                   *val);
    } else {
        bpf_map_update_elem(&hash_map, &key, &init_val, BPF_ANY);
    }

    return 0;
}

char LICENSE[] SEC("license") = "GPL";