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 }