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#include <perf/mmap.h>
 17
 18#ifndef O_DIRECTORY
 19#define O_DIRECTORY    00200000
 20#endif
 21#ifndef AT_FDCWD
 22#define AT_FDCWD       -100
 23#endif
 24
 25int test__syscall_openat_tp_fields(struct test *test __maybe_unused, int subtest __maybe_unused)
 26{
 27	struct record_opts opts = {
 28		.target = {
 29			.uid = UINT_MAX,
 30			.uses_mmap = true,
 31		},
 32		.no_buffering = true,
 33		.freq	      = 1,
 34		.mmap_pages   = 256,
 35		.raw_samples  = true,
 36	};
 37	const char *filename = "/etc/passwd";
 38	int flags = O_RDONLY | O_DIRECTORY;
 39	struct evlist *evlist = evlist__new();
 40	struct evsel *evsel;
 41	int err = -1, i, nr_events = 0, nr_polls = 0;
 42	char sbuf[STRERR_BUFSIZE];
 43
 44	if (evlist == NULL) {
 45		pr_debug("%s: perf_evlist__new\n", __func__);
 46		goto out;
 47	}
 48
 49	evsel = evsel__newtp("syscalls", "sys_enter_openat");
 50	if (IS_ERR(evsel)) {
 51		pr_debug("%s: evsel__newtp\n", __func__);
 52		goto out_delete_evlist;
 53	}
 54
 55	evlist__add(evlist, evsel);
 56
 57	err = perf_evlist__create_maps(evlist, &opts.target);
 58	if (err < 0) {
 59		pr_debug("%s: perf_evlist__create_maps\n", __func__);
 60		goto out_delete_evlist;
 61	}
 62
 63	evsel__config(evsel, &opts, NULL);
 64
 65	perf_thread_map__set_pid(evlist->core.threads, 0, getpid());
 66
 67	err = evlist__open(evlist);
 68	if (err < 0) {
 69		pr_debug("perf_evlist__open: %s\n",
 70			 str_error_r(errno, sbuf, sizeof(sbuf)));
 71		goto out_delete_evlist;
 72	}
 73
 74	err = evlist__mmap(evlist, UINT_MAX);
 75	if (err < 0) {
 76		pr_debug("evlist__mmap: %s\n",
 77			 str_error_r(errno, sbuf, sizeof(sbuf)));
 78		goto out_delete_evlist;
 79	}
 80
 81	evlist__enable(evlist);
 82
 83	/*
 84	 * Generate the event:
 85	 */
 86	openat(AT_FDCWD, filename, flags);
 87
 88	while (1) {
 89		int before = nr_events;
 90
 91		for (i = 0; i < evlist->core.nr_mmaps; i++) {
 92			union perf_event *event;
 93			struct mmap *md;
 94
 95			md = &evlist->mmap[i];
 96			if (perf_mmap__read_init(&md->core) < 0)
 97				continue;
 98
 99			while ((event = perf_mmap__read_event(&md->core)) != NULL) {
100				const u32 type = event->header.type;
101				int tp_flags;
102				struct perf_sample sample;
103
104				++nr_events;
105
106				if (type != PERF_RECORD_SAMPLE) {
107					perf_mmap__consume(&md->core);
108					continue;
109				}
110
111				err = evsel__parse_sample(evsel, event, &sample);
112				if (err) {
113					pr_debug("Can't parse sample, err = %d\n", err);
114					goto out_delete_evlist;
115				}
116
117				tp_flags = evsel__intval(evsel, &sample, "flags");
118
119				if (flags != tp_flags) {
120					pr_debug("%s: Expected flags=%#x, got %#x\n",
121						 __func__, flags, tp_flags);
122					goto out_delete_evlist;
123				}
124
125				goto out_ok;
126			}
127			perf_mmap__read_done(&md->core);
128		}
129
130		if (nr_events == before)
131			evlist__poll(evlist, 10);
132
133		if (++nr_polls > 5) {
134			pr_debug("%s: no events!\n", __func__);
135			goto out_delete_evlist;
136		}
137	}
138out_ok:
139	err = 0;
140out_delete_evlist:
141	evlist__delete(evlist);
142out:
143	return err;
144}