tools/perf/tests/open-syscall.c

   1 #include "thread_map.h"
   2 #include "evsel.h"
   3 #include "debug.h"
   4 #include "tests.h"
   5
   6 int test__open_syscall_event(void)
   7 {
   8         int err = -1, fd;
   9         struct thread_map *threads;
  10         struct perf_evsel *evsel;
  11         struct perf_event_attr attr;
  12         unsigned int nr_open_calls = 111, i;
  13         int id = trace_event__id("sys_enter_open");
  14
  15         if (id < 0) {
  16                 pr_debug("is debugfs mounted on /sys/kernel/debug?\n");
  17                 return -1;
  18         }
  19
  20         threads = thread_map__new(-1, getpid(), UINT_MAX);
  21         if (threads == NULL) {
  22                 pr_debug("thread_map__new\n");
  23                 return -1;
  24         }
  25
  26         memset(&attr, 0, sizeof(attr));
  27         attr.type = PERF_TYPE_TRACEPOINT;
  28         attr.config = id;
  29         evsel = perf_evsel__new(&attr, 0);
  30         if (evsel == NULL) {
  31                 pr_debug("perf_evsel__new\n");
  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                          strerror(errno));
  39                 goto out_evsel_delete;
  40         }
  41
  42         for (i = 0; i < nr_open_calls; ++i) {
  43                 fd = open("/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 (evsel->counts->cpu[0].val != nr_open_calls) {
  53                 pr_debug("perf_evsel__read_on_cpu: expected to intercept %d calls, got %" PRIu64 "\n",
  54                          nr_open_calls, evsel->counts->cpu[0].val);
  55                 goto out_close_fd;
  56         }
  57
  58         err = 0;
  59 out_close_fd:
  60         perf_evsel__close_fd(evsel, 1, threads->nr);
  61 out_evsel_delete:
  62         perf_evsel__delete(evsel);
  63 out_thread_map_delete:
  64         thread_map__delete(threads);
  65         return err;
  66 }