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// SPDX-License-Identifier: GPL-2.0
// Copyright (c) 2024 Andrea Righi <andrea.righi@canonical.com>
#include <linux/bpf.h>
#include <sched.h>
#include <unistd.h>
#include <bpf/bpf_helpers.h>
#include "bpf_misc.h"
char _license[] SEC("license") = "GPL";
#define TASK_COMM_LEN 16
struct sample {
int pid;
long value;
char comm[16];
};
struct {
__uint(type, BPF_MAP_TYPE_RINGBUF);
} ringbuf SEC(".maps");
int pid = 0;
long value = 0;
SEC("fentry/" SYS_PREFIX "sys_getpgid")
int test_ringbuf_n(void *ctx)
{
int cur_pid = bpf_get_current_pid_tgid() >> 32;
struct sample *sample;
if (cur_pid != pid)
return 0;
sample = bpf_ringbuf_reserve(&ringbuf, sizeof(*sample), 0);
if (!sample)
return 0;
sample->pid = pid;
sample->value = value;
bpf_get_current_comm(sample->comm, sizeof(sample->comm));
bpf_ringbuf_submit(sample, 0);
return 0;
}
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