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
test__openat_syscall_event(struct test * test __maybe_unused,int subtest __maybe_unused)16 int 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 = 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 (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 (evsel__read_on_cpu(evsel, 0, 0) < 0) {
50 pr_debug("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("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;
61 out_close_fd:
62 perf_evsel__close_fd(&evsel->core);
63 out_evsel_delete:
64 evsel__delete(evsel);
65 out_thread_map_delete:
66 perf_thread_map__put(threads);
67 return err;
68 }
69