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