hello.c

#include <stdio.h>
#include <unistd.h>
#include <sys/resource.h>
#include <bpf/libbpf.h>
#include "hello.skel.h"

int main(int argc, char **argv)
{
	struct hello_bpf *obj;
	int err = 0;

	struct rlimit rlim_new = {
		.rlim_cur = RLIM_INFINITY,
		.rlim_max = RLIM_INFINITY,
	};

	err = setrlimit(RLIMIT_MEMLOCK, &rlim_new);
	if (err) {
		fprintf(stderr, "failed to change rlimit\n");
		return 1;
	}
	obj = hello_bpf__open();
	if (!obj) {
		fprintf(stderr, "failed to open and/or load BPF object\n");
		return 1;
	}

	err = hello_bpf__load(obj);
	if (err) {
		fprintf(stderr, "failed to load BPF object %d\n", err);
		goto cleanup;
	}

	err = hello_bpf__attach(obj);
	if (err) {
		fprintf(stderr, "failed to attach BPF programs\n");
		goto cleanup;
	}

	printf
	    ("Successfully started! Tracing /sys/kernel/debug/tracing/trace_pipe...\n");

	system("cat /sys/kernel/debug/tracing/trace_pipe");

 cleanup:
	hello_bpf__destroy(obj);
	return err != 0;
}