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
 24int 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	}
137out_ok:
138	err = 0;
139out_delete_evlist:
140	evlist__delete(evlist);
141out:
142	return err;
143}