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 <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
  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 }