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Setup development environment with libbpf
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h3xduck
189
external/libbpf-bootstrap/examples/c/bootstrap.c
vendored
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189
external/libbpf-bootstrap/examples/c/bootstrap.c
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@@ -0,0 +1,189 @@
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// SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause)
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/* Copyright (c) 2020 Facebook */
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#include <argp.h>
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#include <signal.h>
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#include <stdio.h>
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#include <time.h>
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#include <sys/resource.h>
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#include <bpf/libbpf.h>
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#include "bootstrap.h"
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#include "bootstrap.skel.h"
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static struct env {
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bool verbose;
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long min_duration_ms;
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} env;
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const char *argp_program_version = "bootstrap 0.0";
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const char *argp_program_bug_address = "<bpf@vger.kernel.org>";
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const char argp_program_doc[] =
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"BPF bootstrap demo application.\n"
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"\n"
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"It traces process start and exits and shows associated \n"
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"information (filename, process duration, PID and PPID, etc).\n"
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"\n"
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"USAGE: ./bootstrap [-d <min-duration-ms>] [-v]\n";
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static const struct argp_option opts[] = {
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{ "verbose", 'v', NULL, 0, "Verbose debug output" },
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{ "duration", 'd', "DURATION-MS", 0, "Minimum process duration (ms) to report" },
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{},
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};
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static error_t parse_arg(int key, char *arg, struct argp_state *state)
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{
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switch (key) {
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case 'v':
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env.verbose = true;
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break;
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case 'd':
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errno = 0;
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env.min_duration_ms = strtol(arg, NULL, 10);
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if (errno || env.min_duration_ms <= 0) {
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fprintf(stderr, "Invalid duration: %s\n", arg);
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argp_usage(state);
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}
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break;
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case ARGP_KEY_ARG:
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argp_usage(state);
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break;
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default:
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return ARGP_ERR_UNKNOWN;
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}
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return 0;
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}
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static const struct argp argp = {
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.options = opts,
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.parser = parse_arg,
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.doc = argp_program_doc,
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};
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static int libbpf_print_fn(enum libbpf_print_level level, const char *format, va_list args)
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{
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if (level == LIBBPF_DEBUG && !env.verbose)
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return 0;
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return vfprintf(stderr, format, args);
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}
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static void bump_memlock_rlimit(void)
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{
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struct rlimit rlim_new = {
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.rlim_cur = RLIM_INFINITY,
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.rlim_max = RLIM_INFINITY,
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};
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if (setrlimit(RLIMIT_MEMLOCK, &rlim_new)) {
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fprintf(stderr, "Failed to increase RLIMIT_MEMLOCK limit!\n");
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exit(1);
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}
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}
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static volatile bool exiting = false;
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static void sig_handler(int sig)
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{
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exiting = true;
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}
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static int handle_event(void *ctx, void *data, size_t data_sz)
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{
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const struct event *e = data;
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struct tm *tm;
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char ts[32];
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time_t t;
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time(&t);
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tm = localtime(&t);
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strftime(ts, sizeof(ts), "%H:%M:%S", tm);
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if (e->exit_event) {
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printf("%-8s %-5s %-16s %-7d %-7d [%u]",
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ts, "EXIT", e->comm, e->pid, e->ppid, e->exit_code);
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if (e->duration_ns)
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printf(" (%llums)", e->duration_ns / 1000000);
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printf("\n");
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} else {
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printf("%-8s %-5s %-16s %-7d %-7d %s\n",
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ts, "EXEC", e->comm, e->pid, e->ppid, e->filename);
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}
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return 0;
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}
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int main(int argc, char **argv)
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{
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struct ring_buffer *rb = NULL;
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struct bootstrap_bpf *skel;
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int err;
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/* Parse command line arguments */
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err = argp_parse(&argp, argc, argv, 0, NULL, NULL);
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if (err)
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return err;
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/* Set up libbpf errors and debug info callback */
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libbpf_set_print(libbpf_print_fn);
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/* Bump RLIMIT_MEMLOCK to create BPF maps */
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bump_memlock_rlimit();
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/* Cleaner handling of Ctrl-C */
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signal(SIGINT, sig_handler);
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signal(SIGTERM, sig_handler);
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/* Load and verify BPF application */
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skel = bootstrap_bpf__open();
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if (!skel) {
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fprintf(stderr, "Failed to open and load BPF skeleton\n");
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return 1;
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}
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/* Parameterize BPF code with minimum duration parameter */
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skel->rodata->min_duration_ns = env.min_duration_ms * 1000000ULL;
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/* Load & verify BPF programs */
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err = bootstrap_bpf__load(skel);
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if (err) {
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fprintf(stderr, "Failed to load and verify BPF skeleton\n");
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goto cleanup;
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}
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/* Attach tracepoints */
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err = bootstrap_bpf__attach(skel);
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if (err) {
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fprintf(stderr, "Failed to attach BPF skeleton\n");
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goto cleanup;
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}
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/* Set up ring buffer polling */
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rb = ring_buffer__new(bpf_map__fd(skel->maps.rb), handle_event, NULL, NULL);
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if (!rb) {
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err = -1;
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fprintf(stderr, "Failed to create ring buffer\n");
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goto cleanup;
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}
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/* Process events */
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printf("%-8s %-5s %-16s %-7s %-7s %s\n",
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"TIME", "EVENT", "COMM", "PID", "PPID", "FILENAME/EXIT CODE");
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while (!exiting) {
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err = ring_buffer__poll(rb, 100 /* timeout, ms */);
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/* Ctrl-C will cause -EINTR */
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if (err == -EINTR) {
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err = 0;
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break;
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}
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if (err < 0) {
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printf("Error polling perf buffer: %d\n", err);
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break;
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}
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}
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cleanup:
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/* Clean up */
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ring_buffer__free(rb);
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bootstrap_bpf__destroy(skel);
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return err < 0 ? -err : 0;
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}
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