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}
145