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 "util/mmap.h"
  15 #include <errno.h>
  16
  17 #ifndef O_DIRECTORY
  18 #define O_DIRECTORY    00200000
  19 #endif
  20 #ifndef AT_FDCWD
  21 #define AT_FDCWD       -100
  22 #endif
  23
  24 int test__syscall_openat_tp_fields(struct test *test __maybe_unused, int subtest __maybe_unused)
  25 {
  26         struct record_opts opts = {
  27                 .target = {
  28                         .uid = UINT_MAX,
  29                         .uses_mmap = true,
  30                 },
  31                 .no_buffering = true,
  32                 .freq         = 1,
  33                 .mmap_pages   = 256,
  34                 .raw_samples  = true,
  35         };
  36         const char *filename = "/etc/passwd";
  37         int flags = O_RDONLY | O_DIRECTORY;
  38         struct evlist *evlist = evlist__new();
  39         struct evsel *evsel;
  40         int err = -1, i, nr_events = 0, nr_polls = 0;
  41         char sbuf[STRERR_BUFSIZE];
  42
  43         if (evlist == NULL) {
  44                 pr_debug("%s: perf_evlist__new\n", __func__);
  45                 goto out;
  46         }
  47
  48         evsel = perf_evsel__newtp("syscalls", "sys_enter_openat");
  49         if (IS_ERR(evsel)) {
  50                 pr_debug("%s: perf_evsel__newtp\n", __func__);
  51                 goto out_delete_evlist;
  52         }
  53
  54         evlist__add(evlist, evsel);
  55
  56         err = perf_evlist__create_maps(evlist, &opts.target);
  57         if (err < 0) {
  58                 pr_debug("%s: perf_evlist__create_maps\n", __func__);
  59                 goto out_delete_evlist;
  60         }
  61
  62         perf_evsel__config(evsel, &opts, NULL);
  63
  64         perf_thread_map__set_pid(evlist->core.threads, 0, getpid());
  65
  66         err = evlist__open(evlist);
  67         if (err < 0) {
  68                 pr_debug("perf_evlist__open: %s\n",
  69                          str_error_r(errno, sbuf, sizeof(sbuf)));
  70                 goto out_delete_evlist;
  71         }
  72
  73         err = evlist__mmap(evlist, UINT_MAX);
  74         if (err < 0) {
  75                 pr_debug("evlist__mmap: %s\n",
  76                          str_error_r(errno, sbuf, sizeof(sbuf)));
  77                 goto out_delete_evlist;
  78         }
  79
  80         evlist__enable(evlist);
  81
  82         /*
  83          * Generate the event:
  84          */
  85         openat(AT_FDCWD, filename, flags);
  86
  87         while (1) {
  88                 int before = nr_events;
  89
  90                 for (i = 0; i < evlist->core.nr_mmaps; i++) {
  91                         union perf_event *event;
  92                         struct mmap *md;
  93
  94                         md = &evlist->mmap[i];
  95                         if (perf_mmap__read_init(md) < 0)
  96                                 continue;
  97
  98                         while ((event = perf_mmap__read_event(md)) != NULL) {
  99                                 const u32 type = event->header.type;
 100                                 int tp_flags;
 101                                 struct perf_sample sample;
 102
 103                                 ++nr_events;
 104
 105                                 if (type != PERF_RECORD_SAMPLE) {
 106                                         perf_mmap__consume(md);
 107                                         continue;
 108                                 }
 109
 110                                 err = perf_evsel__parse_sample(evsel, event, &sample);
 111                                 if (err) {
 112                                         pr_debug("Can't parse sample, err = %d\n", err);
 113                                         goto out_delete_evlist;
 114                                 }
 115
 116                                 tp_flags = perf_evsel__intval(evsel, &sample, "flags");
 117
 118                                 if (flags != tp_flags) {
 119                                         pr_debug("%s: Expected flags=%#x, got %#x\n",
 120                                                  __func__, flags, tp_flags);
 121                                         goto out_delete_evlist;
 122                                 }
 123
 124                                 goto out_ok;
 125                         }
 126                         perf_mmap__read_done(md);
 127                 }
 128
 129                 if (nr_events == before)
 130                         evlist__poll(evlist, 10);
 131
 132                 if (++nr_polls > 5) {
 133                         pr_debug("%s: no events!\n", __func__);
 134                         goto out_delete_evlist;
 135                 }
 136         }
 137 out_ok:
 138         err = 0;
 139 out_delete_evlist:
 140         evlist__delete(evlist);
 141 out:
 142         return err;
 143 }