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

   1 // SPDX-License-Identifier: GPL-2.0
   2 #include <stdbool.h>
   3 #include <linux/err.h>
   4 #include <linux/string.h>
   5 #include <sys/types.h>
   6 #include <sys/stat.h>
   7 #include <fcntl.h>
   8 #include "evlist.h"
   9 #include "evsel.h"
  10 #include "thread_map.h"
  11 #include "record.h"
  12 #include "tests.h"
  13 #include "debug.h"
  14 #include <errno.h>
  15
  16 #ifndef O_DIRECTORY
  17 #define O_DIRECTORY    00200000
  18 #endif
  19 #ifndef AT_FDCWD
  20 #define AT_FDCWD       -100
  21 #endif
  22
  23 int test__syscall_openat_tp_fields(struct test *test __maybe_unused, int subtest __maybe_unused)
  24 {
  25         struct record_opts opts = {
  26                 .target = {
  27                         .uid = UINT_MAX,
  28                         .uses_mmap = true,
  29                 },
  30                 .no_buffering = true,
  31                 .freq         = 1,
  32                 .mmap_pages   = 256,
  33                 .raw_samples  = true,
  34         };
  35         const char *filename = "/etc/passwd";
  36         int flags = O_RDONLY | O_DIRECTORY;
  37         struct evlist *evlist = evlist__new();
  38         struct evsel *evsel;
  39         int err = -1, i, nr_events = 0, nr_polls = 0;
  40         char sbuf[STRERR_BUFSIZE];
  41
  42         if (evlist == NULL) {
  43                 pr_debug("%s: perf_evlist__new\n", __func__);
  44                 goto out;
  45         }
  46
  47         evsel = perf_evsel__newtp("syscalls", "sys_enter_openat");
  48         if (IS_ERR(evsel)) {
  49                 pr_debug("%s: perf_evsel__newtp\n", __func__);
  50                 goto out_delete_evlist;
  51         }
  52
  53         evlist__add(evlist, evsel);
  54
  55         err = perf_evlist__create_maps(evlist, &opts.target);
  56         if (err < 0) {
  57                 pr_debug("%s: perf_evlist__create_maps\n", __func__);
  58                 goto out_delete_evlist;
  59         }
  60
  61         perf_evsel__config(evsel, &opts, NULL);
  62
  63         perf_thread_map__set_pid(evlist->core.threads, 0, getpid());
  64
  65         err = evlist__open(evlist);
  66         if (err < 0) {
  67                 pr_debug("perf_evlist__open: %s\n",
  68                          str_error_r(errno, sbuf, sizeof(sbuf)));
  69                 goto out_delete_evlist;
  70         }
  71
  72         err = evlist__mmap(evlist, UINT_MAX);
  73         if (err < 0) {
  74                 pr_debug("evlist__mmap: %s\n",
  75                          str_error_r(errno, sbuf, sizeof(sbuf)));
  76                 goto out_delete_evlist;
  77         }
  78
  79         evlist__enable(evlist);
  80
  81         /*
  82          * Generate the event:
  83          */
  84         openat(AT_FDCWD, filename, flags);
  85
  86         while (1) {
  87                 int before = nr_events;
  88
  89                 for (i = 0; i < evlist->nr_mmaps; i++) {
  90                         union perf_event *event;
  91                         struct mmap *md;
  92
  93                         md = &evlist->mmap[i];
  94                         if (perf_mmap__read_init(md) < 0)
  95                                 continue;
  96
  97                         while ((event = perf_mmap__read_event(md)) != NULL) {
  98                                 const u32 type = event->header.type;
  99                                 int tp_flags;
 100                                 struct perf_sample sample;
 101
 102                                 ++nr_events;
 103
 104                                 if (type != PERF_RECORD_SAMPLE) {
 105                                         perf_mmap__consume(md);
 106                                         continue;
 107                                 }
 108
 109                                 err = perf_evsel__parse_sample(evsel, event, &sample);
 110                                 if (err) {
 111                                         pr_debug("Can't parse sample, err = %d\n", err);
 112                                         goto out_delete_evlist;
 113                                 }
 114
 115                                 tp_flags = perf_evsel__intval(evsel, &sample, "flags");
 116
 117                                 if (flags != tp_flags) {
 118                                         pr_debug("%s: Expected flags=%#x, got %#x\n",
 119                                                  __func__, flags, tp_flags);
 120                                         goto out_delete_evlist;
 121                                 }
 122
 123                                 goto out_ok;
 124                         }
 125                         perf_mmap__read_done(md);
 126                 }
 127
 128                 if (nr_events == before)
 129                         perf_evlist__poll(evlist, 10);
 130
 131                 if (++nr_polls > 5) {
 132                         pr_debug("%s: no events!\n", __func__);
 133                         goto out_delete_evlist;
 134                 }
 135         }
 136 out_ok:
 137         err = 0;
 138 out_delete_evlist:
 139         evlist__delete(evlist);
 140 out:
 141         return err;
 142 }