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