tools/perf/tests/openat-syscall.c

   1 #include <api/fs/fs.h>
   2 #include "thread_map.h"
   3 #include "evsel.h"
   4 #include "debug.h"
   5 #include "tests.h"
   6
   7 int test__openat_syscall_event(void)
   8 {
   9         int err = -1, fd;
  10         struct perf_evsel *evsel;
  11         unsigned int nr_openat_calls = 111, i;
  12         struct thread_map *threads = thread_map__new(-1, getpid(), UINT_MAX);
  13         char sbuf[STRERR_BUFSIZE];
  14
  15         if (threads == NULL) {
  16                 pr_debug("thread_map__new\n");
  17                 return -1;
  18         }
  19
  20         evsel = perf_evsel__newtp("syscalls", "sys_enter_openat");
  21         if (evsel == NULL) {
  22                 if (tracefs__configured())
  23                         pr_debug("is tracefs mounted on /sys/kernel/tracing?\n");
  24                 else if (debugfs__configured())
  25                         pr_debug("is debugfs mounted on /sys/kernel/debug?\n");
  26                 else
  27                         pr_debug("Neither tracefs or debugfs is enabled in this kernel\n");
  28                 goto out_thread_map_delete;
  29         }
  30
  31         if (perf_evsel__open_per_thread(evsel, threads) < 0) {
  32                 pr_debug("failed to open counter: %s, "
  33                          "tweak /proc/sys/kernel/perf_event_paranoid?\n",
  34                          strerror_r(errno, sbuf, sizeof(sbuf)));
  35                 goto out_evsel_delete;
  36         }
  37
  38         for (i = 0; i < nr_openat_calls; ++i) {
  39                 fd = openat(0, "/etc/passwd", O_RDONLY);
  40                 close(fd);
  41         }
  42
  43         if (perf_evsel__read_on_cpu(evsel, 0, 0) < 0) {
  44                 pr_debug("perf_evsel__read_on_cpu\n");
  45                 goto out_close_fd;
  46         }
  47
  48         if (perf_counts(evsel->counts, 0, 0)->val != nr_openat_calls) {
  49                 pr_debug("perf_evsel__read_on_cpu: expected to intercept %d calls, got %" PRIu64 "\n",
  50                          nr_openat_calls, perf_counts(evsel->counts, 0, 0)->val);
  51                 goto out_close_fd;
  52         }
  53
  54         err = 0;
  55 out_close_fd:
  56         perf_evsel__close_fd(evsel, 1, threads->nr);
  57 out_evsel_delete:
  58         perf_evsel__delete(evsel);
  59 out_thread_map_delete:
  60         thread_map__put(threads);
  61         return err;
  62 }