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// SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause)
// Copyright (c) 2020 Wenbo Zhang
//
// Based on filelife(8) from BCC by Brendan Gregg & Allan McAleavy.
// 20-Mar-2020 Wenbo Zhang Created this.
// 13-Nov-2022 Rong Tao Check btf struct field for CO-RE and add vfs_open()
// 23-Aug-2023 Rong Tao Add vfs_* 'struct mnt_idmap' support.(CO-RE)
// 08-Nov-2023 Rong Tao Support unlink failed
#include <argp.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <time.h>
#include <bpf/libbpf.h>
#include <bpf/bpf.h>
#include "filelife.h"
#include "filelife.skel.h"
#include "btf_helpers.h"
#include "trace_helpers.h"
#define PERF_BUFFER_PAGES 16
#define PERF_POLL_TIMEOUT_MS 100
static volatile sig_atomic_t exiting = 0;
static struct env {
pid_t pid;
bool verbose;
} env = { };
const char *argp_program_version = "filelife 0.1";
const char *argp_program_bug_address =
"https://github.com/iovisor/bcc/tree/master/libbpf-tools";
const char argp_program_doc[] =
"Trace the lifespan of short-lived files.\n"
"\n"
"USAGE: filelife [--help] [-p PID]\n"
"\n"
"EXAMPLES:\n"
" filelife # trace all events\n"
" filelife -p 123 # trace pid 123\n";
static const struct argp_option opts[] = {
{ "pid", 'p', "PID", 0, "Process PID to trace", 0 },
{ "verbose", 'v', NULL, 0, "Verbose debug output", 0 },
{ NULL, 'h', NULL, OPTION_HIDDEN, "Show the full help", 0 },
{},
};
static error_t parse_arg(int key, char *arg, struct argp_state *state)
{
int pid;
switch (key) {
case 'h':
argp_state_help(state, stderr, ARGP_HELP_STD_HELP);
break;
case 'v':
env.verbose = true;
break;
case 'p':
errno = 0;
pid = strtol(arg, NULL, 10);
if (errno || pid <= 0) {
fprintf(stderr, "invalid PID: %s\n", arg);
argp_usage(state);
}
env.pid = pid;
break;
default:
return ARGP_ERR_UNKNOWN;
}
return 0;
}
static int libbpf_print_fn(enum libbpf_print_level level, const char *format, va_list args)
{
if (level == LIBBPF_DEBUG && !env.verbose)
return 0;
return vfprintf(stderr, format, args);
}
static void sig_int(int signo)
{
exiting = 1;
}
void handle_event(void *ctx, int cpu, void *data, __u32 data_sz)
{
struct event e;
struct tm *tm;
char ts[32];
time_t t;
if (data_sz < sizeof(e)) {
printf("Error: packet too small\n");
return;
}
/* Copy data as alignment in the perf buffer isn't guaranteed. */
memcpy(&e, data, sizeof(e));
time(&t);
tm = localtime(&t);
strftime(ts, sizeof(ts), "%H:%M:%S", tm);
printf("%-8s %-6d %-16s %-7.2f %s\n",
ts, e.tgid, e.task, (double)e.delta_ns / 1000000000,
e.file);
}
void handle_lost_events(void *ctx, int cpu, __u64 lost_cnt)
{
fprintf(stderr, "lost %llu events on CPU #%d\n", lost_cnt, cpu);
}
int main(int argc, char **argv)
{
LIBBPF_OPTS(bpf_object_open_opts, open_opts);
static const struct argp argp = {
.options = opts,
.parser = parse_arg,
.doc = argp_program_doc,
};
struct perf_buffer *pb = NULL;
struct filelife_bpf *obj;
int err;
err = argp_parse(&argp, argc, argv, 0, NULL, NULL);
if (err)
return err;
libbpf_set_print(libbpf_print_fn);
err = ensure_core_btf(&open_opts);
if (err) {
fprintf(stderr, "failed to fetch necessary BTF for CO-RE: %s\n", strerror(-err));
return 1;
}
obj = filelife_bpf__open_opts(&open_opts);
if (!obj) {
fprintf(stderr, "failed to open BPF object\n");
return 1;
}
/* initialize global data (filtering options) */
obj->rodata->targ_tgid = env.pid;
if (!kprobe_exists("security_inode_create"))
bpf_program__set_autoload(obj->progs.security_inode_create, false);
err = filelife_bpf__load(obj);
if (err) {
fprintf(stderr, "failed to load BPF object: %d\n", err);
goto cleanup;
}
err = filelife_bpf__attach(obj);
if (err) {
fprintf(stderr, "failed to attach BPF programs\n");
goto cleanup;
}
printf("Tracing the lifespan of short-lived files ... Hit Ctrl-C to end.\n");
printf("%-8s %-6s %-16s %-7s %s\n", "TIME", "PID", "COMM", "AGE(s)", "FILE");
pb = perf_buffer__new(bpf_map__fd(obj->maps.events), PERF_BUFFER_PAGES,
handle_event, handle_lost_events, NULL, NULL);
if (!pb) {
err = -errno;
fprintf(stderr, "failed to open perf buffer: %d\n", err);
goto cleanup;
}
if (signal(SIGINT, sig_int) == SIG_ERR) {
fprintf(stderr, "can't set signal handler: %s\n", strerror(errno));
err = 1;
goto cleanup;
}
while (!exiting) {
err = perf_buffer__poll(pb, PERF_POLL_TIMEOUT_MS);
if (err < 0 && err != -EINTR) {
fprintf(stderr, "error polling perf buffer: %s\n", strerror(-err));
goto cleanup;
}
/* reset err to return 0 if exiting */
err = 0;
}
cleanup:
perf_buffer__free(pb);
filelife_bpf__destroy(obj);
cleanup_core_btf(&open_opts);
return err != 0;
}
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