// Copyright (c) 2016 Allan McAleavy.
// Copyright (c) 2015 Brendan Gregg.
// Licensed under the Apache License, Version 2.0 (the "License")

#include <uapi/linux/ptrace.h>
struct key_t {
    u64 ip;
};

BPF_HASH(counts, struct key_t);

int do_count(struct pt_regs *ctx) {
    struct key_t key = {};
    u64 zero = 0, *val;
    u64 ip;

    key.ip = PT_REGS_IP(ctx);
    val = counts.lookup_or_init(&key, &zero);  // update counter
    if (val) {
        (*val)++;
    }
    return 0;
}