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#include "util/sample.h"
 18
 19#ifndef O_DIRECTORY
 20#define O_DIRECTORY    00200000
 21#endif
 22#ifndef AT_FDCWD
 23#define AT_FDCWD       -100
 24#endif
 25
 26static int test__syscall_openat_tp_fields(struct test_suite *test __maybe_unused,
 27					  int subtest __maybe_unused)
 28{
 29	struct record_opts opts = {
 30		.target = {
 31			.uid = UINT_MAX,
 32			.uses_mmap = true,
 33		},
 34		.no_buffering = true,
 35		.freq	      = 1,
 36		.mmap_pages   = 256,
 37		.raw_samples  = true,
 38	};
 39	const char *filename = "/etc/passwd";
 40	int flags = O_RDONLY | O_DIRECTORY;
 41	struct evlist *evlist = evlist__new();
 42	struct evsel *evsel;
 43	int err = -1, i, nr_events = 0, nr_polls = 0;
 44	char sbuf[STRERR_BUFSIZE];
 45
 46	if (evlist == NULL) {
 47		pr_debug("%s: evlist__new\n", __func__);
 48		goto out;
 49	}
 50
 51	evsel = evsel__newtp("syscalls", "sys_enter_openat");
 52	if (IS_ERR(evsel)) {
 53		pr_debug("%s: evsel__newtp\n", __func__);
 54		goto out_delete_evlist;
 55	}
 56
 57	evlist__add(evlist, evsel);
 58
 59	err = evlist__create_maps(evlist, &opts.target);
 60	if (err < 0) {
 61		pr_debug("%s: evlist__create_maps\n", __func__);
 62		goto out_delete_evlist;
 63	}
 64
 65	evsel__config(evsel, &opts, NULL);
 66
 67	perf_thread_map__set_pid(evlist->core.threads, 0, getpid());
 68
 69	err = evlist__open(evlist);
 70	if (err < 0) {
 71		pr_debug("perf_evlist__open: %s\n",
 72			 str_error_r(errno, sbuf, sizeof(sbuf)));
 73		goto out_delete_evlist;
 74	}
 75
 76	err = evlist__mmap(evlist, UINT_MAX);
 77	if (err < 0) {
 78		pr_debug("evlist__mmap: %s\n",
 79			 str_error_r(errno, sbuf, sizeof(sbuf)));
 80		goto out_delete_evlist;
 81	}
 82
 83	evlist__enable(evlist);
 84
 85	/*
 86	 * Generate the event:
 87	 */
 88	openat(AT_FDCWD, filename, flags);
 89
 90	while (1) {
 91		int before = nr_events;
 92
 93		for (i = 0; i < evlist->core.nr_mmaps; i++) {
 94			union perf_event *event;
 95			struct mmap *md;
 96
 97			md = &evlist->mmap[i];
 98			if (perf_mmap__read_init(&md->core) < 0)
 99				continue;
100
101			while ((event = perf_mmap__read_event(&md->core)) != NULL) {
102				const u32 type = event->header.type;
103				int tp_flags;
104				struct perf_sample sample;
105
106				++nr_events;
107
108				if (type != PERF_RECORD_SAMPLE) {
109					perf_mmap__consume(&md->core);
110					continue;
111				}
112
113				err = evsel__parse_sample(evsel, event, &sample);
114				if (err) {
115					pr_debug("Can't parse sample, err = %d\n", err);
116					goto out_delete_evlist;
117				}
118
119				tp_flags = evsel__intval(evsel, &sample, "flags");
120
121				if (flags != tp_flags) {
122					pr_debug("%s: Expected flags=%#x, got %#x\n",
123						 __func__, flags, tp_flags);
124					goto out_delete_evlist;
125				}
126
127				goto out_ok;
128			}
129			perf_mmap__read_done(&md->core);
130		}
131
132		if (nr_events == before)
133			evlist__poll(evlist, 10);
134
135		if (++nr_polls > 5) {
136			pr_debug("%s: no events!\n", __func__);
137			goto out_delete_evlist;
138		}
139	}
140out_ok:
141	err = 0;
142out_delete_evlist:
143	evlist__delete(evlist);
144out:
145	return err;
146}
147
148DEFINE_SUITE("syscalls:sys_enter_openat event fields", syscall_openat_tp_fields);