tools/perf/tests/openat-syscall-tp-fields.c

   1 #include <linux/err.h>
   2 #include "perf.h"
   3 #include "evlist.h"
   4 #include "evsel.h"
   5 #include "thread_map.h"
   6 #include "tests.h"
   7 #include "debug.h"
   8
   9 int test__syscall_openat_tp_fields(void)
  10 {
  11         struct record_opts opts = {
  12                 .target = {
  13                         .uid = UINT_MAX,
  14                         .uses_mmap = true,
  15                 },
  16                 .no_buffering = true,
  17                 .freq         = 1,
  18                 .mmap_pages   = 256,
  19                 .raw_samples  = true,
  20         };
  21         const char *filename = "/etc/passwd";
  22         int flags = O_RDONLY | O_DIRECTORY;
  23         struct perf_evlist *evlist = perf_evlist__new();
  24         struct perf_evsel *evsel;
  25         int err = -1, i, nr_events = 0, nr_polls = 0;
  26         char sbuf[STRERR_BUFSIZE];
  27
  28         if (evlist == NULL) {
  29                 pr_debug("%s: perf_evlist__new\n", __func__);
  30                 goto out;
  31         }
  32
  33         evsel = perf_evsel__newtp("syscalls", "sys_enter_openat");
  34         if (IS_ERR(evsel)) {
  35                 pr_debug("%s: perf_evsel__newtp\n", __func__);
  36                 goto out_delete_evlist;
  37         }
  38
  39         perf_evlist__add(evlist, evsel);
  40
  41         err = perf_evlist__create_maps(evlist, &opts.target);
  42         if (err < 0) {
  43                 pr_debug("%s: perf_evlist__create_maps\n", __func__);
  44                 goto out_delete_evlist;
  45         }
  46
  47         perf_evsel__config(evsel, &opts);
  48
  49         thread_map__set_pid(evlist->threads, 0, getpid());
  50
  51         err = perf_evlist__open(evlist);
  52         if (err < 0) {
  53                 pr_debug("perf_evlist__open: %s\n",
  54                          strerror_r(errno, sbuf, sizeof(sbuf)));
  55                 goto out_delete_evlist;
  56         }
  57
  58         err = perf_evlist__mmap(evlist, UINT_MAX, false);
  59         if (err < 0) {
  60                 pr_debug("perf_evlist__mmap: %s\n",
  61                          strerror_r(errno, sbuf, sizeof(sbuf)));
  62                 goto out_delete_evlist;
  63         }
  64
  65         perf_evlist__enable(evlist);
  66
  67         /*
  68          * Generate the event:
  69          */
  70         openat(AT_FDCWD, filename, flags);
  71
  72         while (1) {
  73                 int before = nr_events;
  74
  75                 for (i = 0; i < evlist->nr_mmaps; i++) {
  76                         union perf_event *event;
  77
  78                         while ((event = perf_evlist__mmap_read(evlist, i)) != NULL) {
  79                                 const u32 type = event->header.type;
  80                                 int tp_flags;
  81                                 struct perf_sample sample;
  82
  83                                 ++nr_events;
  84
  85                                 if (type != PERF_RECORD_SAMPLE) {
  86                                         perf_evlist__mmap_consume(evlist, i);
  87                                         continue;
  88                                 }
  89
  90                                 err = perf_evsel__parse_sample(evsel, event, &sample);
  91                                 if (err) {
  92                                         pr_err("Can't parse sample, err = %d\n", err);
  93                                         goto out_delete_evlist;
  94                                 }
  95
  96                                 tp_flags = perf_evsel__intval(evsel, &sample, "flags");
  97
  98                                 if (flags != tp_flags) {
  99                                         pr_debug("%s: Expected flags=%#x, got %#x\n",
 100                                                  __func__, flags, tp_flags);
 101                                         goto out_delete_evlist;
 102                                 }
 103
 104                                 goto out_ok;
 105                         }
 106                 }
 107
 108                 if (nr_events == before)
 109                         perf_evlist__poll(evlist, 10);
 110
 111                 if (++nr_polls > 5) {
 112                         pr_debug("%s: no events!\n", __func__);
 113                         goto out_delete_evlist;
 114                 }
 115         }
 116 out_ok:
 117         err = 0;
 118 out_delete_evlist:
 119         perf_evlist__delete(evlist);
 120 out:
 121         return err;
 122 }