tools/perf/tests/openat-syscall.c

   1 #include <errno.h>
   2 #include <inttypes.h>
   3 #include <api/fs/tracing_path.h>
   4 #include <linux/err.h>
   5 #include <sys/types.h>
   6 #include <sys/stat.h>
   7 #include <fcntl.h>
   8 #include "thread_map.h"
   9 #include "evsel.h"
  10 #include "debug.h"
  11 #include "tests.h"
  12
  13 int test__openat_syscall_event(int subtest __maybe_unused)
  14 {
  15         int err = -1, fd;
  16         struct perf_evsel *evsel;
  17         unsigned int nr_openat_calls = 111, i;
  18         struct thread_map *threads = thread_map__new(-1, getpid(), UINT_MAX);
  19         char sbuf[STRERR_BUFSIZE];
  20         char errbuf[BUFSIZ];
  21
  22         if (threads == NULL) {
  23                 pr_debug("thread_map__new\n");
  24                 return -1;
  25         }
  26
  27         evsel = perf_evsel__newtp("syscalls", "sys_enter_openat");
  28         if (IS_ERR(evsel)) {
  29                 tracing_path__strerror_open_tp(errno, errbuf, sizeof(errbuf), "syscalls", "sys_enter_openat");
  30                 pr_debug("%s\n", errbuf);
  31                 goto out_thread_map_delete;
  32         }
  33
  34         if (perf_evsel__open_per_thread(evsel, threads) < 0) {
  35                 pr_debug("failed to open counter: %s, "
  36                          "tweak /proc/sys/kernel/perf_event_paranoid?\n",
  37                          str_error_r(errno, sbuf, sizeof(sbuf)));
  38                 goto out_evsel_delete;
  39         }
  40
  41         for (i = 0; i < nr_openat_calls; ++i) {
  42                 fd = openat(0, "/etc/passwd", O_RDONLY);
  43                 close(fd);
  44         }
  45
  46         if (perf_evsel__read_on_cpu(evsel, 0, 0) < 0) {
  47                 pr_debug("perf_evsel__read_on_cpu\n");
  48                 goto out_close_fd;
  49         }
  50
  51         if (perf_counts(evsel->counts, 0, 0)->val != nr_openat_calls) {
  52                 pr_debug("perf_evsel__read_on_cpu: expected to intercept %d calls, got %" PRIu64 "\n",
  53                          nr_openat_calls, perf_counts(evsel->counts, 0, 0)->val);
  54                 goto out_close_fd;
  55         }
  56
  57         err = 0;
  58 out_close_fd:
  59         perf_evsel__close_fd(evsel, 1, threads->nr);
  60 out_evsel_delete:
  61         perf_evsel__delete(evsel);
  62 out_thread_map_delete:
  63         thread_map__put(threads);
  64         return err;
  65 }