// SPDX-License-Identifier: GPL-2.0

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

struct {
    __uint(type, BPF_MAP_TYPE_RINGBUF);
    __uint(max_entries, 4096 /* one page */);
} ringbuf SEC(".maps");

SEC("tracepoint/syscalls/sys_enter_getpid")
int handle__tracepoint(void *ctx)
{
    int *value;

    value = bpf_ringbuf_reserve(&ringbuf, sizeof(int), 0);
    if (!value) {
        bpf_printk("handle__tracepoint: failed to reserve ring buffer space");
        return 1;
    }

    *value = 1;
    bpf_ringbuf_submit(value, 0);
    bpf_printk("handle__tracepoint: submitted ringbuf value");
    return 0;
}

SEC("tracepoint/syscalls/sys_enter_getpid")
int handle__tracepoint_with_cookie(void *ctx)
{
    int *value;

    value = bpf_ringbuf_reserve(&ringbuf, sizeof(int), 0);
    if (!value) {
        bpf_printk("handle__tracepoint_with_cookie: failed to reserve ring buffer space");
        return 1;
    }

    *value = bpf_get_attach_cookie(ctx);
    bpf_printk("handle__tracepoint_with_cookie: cookie=%d", *value);
    bpf_ringbuf_submit(value, 0);
    return 0;
}

struct {
    __uint(type, BPF_MAP_TYPE_PERF_EVENT_ARRAY);
    __uint(key_size, sizeof(int));
    __uint(value_size, sizeof(int));
} pb SEC(".maps");

SEC("tracepoint/syscalls/sys_enter_getpid")
int handle__tracepoint_with_cookie_pb(void *ctx)
{
    int value = bpf_get_attach_cookie(ctx);
    bpf_perf_event_output(ctx, &pb, BPF_F_CURRENT_CPU, &value, sizeof(value));

    return 0;
}

struct {
    __uint(type, BPF_MAP_TYPE_QUEUE);
    __uint(max_entries, 10);
    __uint(key, 0);
    __type(value, __u32);
} queue SEC(".maps");

struct {
    __uint(type, BPF_MAP_TYPE_STACK);
    __uint(max_entries, 10);
    __uint(key, 0);
    __type(value, __u32);
} stack SEC(".maps");

struct {
    __uint(type, BPF_MAP_TYPE_BLOOM_FILTER);
    __uint(max_entries, 5);
    __type(value, __u32);
} bloom_filter SEC(".maps");

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