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);
149