1// SPDX-License-Identifier: GPL-2.0
 2#include <errno.h>
 3#include <inttypes.h>
 4#include <api/fs/tracing_path.h>
 5#include <linux/err.h>
 6#include <linux/string.h>
 7#include <sys/types.h>
 8#include <sys/stat.h>
 9#include <fcntl.h>
10#include "thread_map.h"
11#include "evsel.h"
12#include "debug.h"
13#include "tests.h"
14#include "util/counts.h"
15
16int test__openat_syscall_event(struct test *test __maybe_unused, int subtest __maybe_unused)
17{
18	int err = -1, fd;
19	struct evsel *evsel;
20	unsigned int nr_openat_calls = 111, i;
21	struct perf_thread_map *threads = thread_map__new(-1, getpid(), UINT_MAX);
22	char sbuf[STRERR_BUFSIZE];
23	char errbuf[BUFSIZ];
24
25	if (threads == NULL) {
26		pr_debug("thread_map__new\n");
27		return -1;
28	}
29
30	evsel = perf_evsel__newtp("syscalls", "sys_enter_openat");
31	if (IS_ERR(evsel)) {
32		tracing_path__strerror_open_tp(errno, errbuf, sizeof(errbuf), "syscalls", "sys_enter_openat");
33		pr_debug("%s\n", errbuf);
34		goto out_thread_map_delete;
35	}
36
37	if (perf_evsel__open_per_thread(evsel, threads) < 0) {
38		pr_debug("failed to open counter: %s, "
39			 "tweak /proc/sys/kernel/perf_event_paranoid?\n",
40			 str_error_r(errno, sbuf, sizeof(sbuf)));
41		goto out_evsel_delete;
42	}
43
44	for (i = 0; i < nr_openat_calls; ++i) {
45		fd = openat(0, "/etc/passwd", O_RDONLY);
46		close(fd);
47	}
48
49	if (perf_evsel__read_on_cpu(evsel, 0, 0) < 0) {
50		pr_debug("perf_evsel__read_on_cpu\n");
51		goto out_close_fd;
52	}
53
54	if (perf_counts(evsel->counts, 0, 0)->val != nr_openat_calls) {
55		pr_debug("perf_evsel__read_on_cpu: expected to intercept %d calls, got %" PRIu64 "\n",
56			 nr_openat_calls, perf_counts(evsel->counts, 0, 0)->val);
57		goto out_close_fd;
58	}
59
60	err = 0;
61out_close_fd:
62	perf_evsel__close_fd(&evsel->core);
63out_evsel_delete:
64	evsel__delete(evsel);
65out_thread_map_delete:
66	perf_thread_map__put(threads);
67	return err;
68}