LXR linux/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
  13int 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;
  58out_close_fd:
  59        perf_evsel__close_fd(evsel, 1, threads->nr);
  60out_evsel_delete:
  61        perf_evsel__delete(evsel);
  62out_thread_map_delete:
  63        thread_map__put(threads);
  64        return err;
  65}
  66