GNU Linux-libre 4.19.211-gnu1
[releases.git] / tools / perf / tests / openat-syscall.c
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
14 int 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;
59 out_close_fd:
60         perf_evsel__close_fd(evsel);
61 out_evsel_delete:
62         perf_evsel__delete(evsel);
63 out_thread_map_delete:
64         thread_map__put(threads);
65         return err;
66 }