openat-syscall-tp-fields.c

  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			.uses_mmap = true,
 32		},
 33		.no_buffering = true,
 34		.freq	      = 1,
 35		.mmap_pages   = 256,
 36		.raw_samples  = true,
 37	};
 38	const char *filename = "/etc/passwd";
 39	int flags = O_RDONLY | O_DIRECTORY;
 40	struct evlist *evlist = evlist__new();
 41	struct evsel *evsel;
 42	int ret = TEST_FAIL, err, i, nr_events = 0, nr_polls = 0;
 43	char sbuf[STRERR_BUFSIZE];
 44
 45	if (evlist == NULL) {
 46		pr_debug("%s: evlist__new\n", __func__);
 47		goto out;
 48	}
 49
 50	evsel = evsel__newtp("syscalls", "sys_enter_openat");
 51	if (IS_ERR(evsel)) {
 52		pr_debug("%s: evsel__newtp\n", __func__);
 53		ret = PTR_ERR(evsel) == -EACCES ? TEST_SKIP : TEST_FAIL;
 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				perf_sample__init(&sample, /*all=*/false);
114				err = evsel__parse_sample(evsel, event, &sample);
115				if (err) {
116					pr_debug("Can't parse sample, err = %d\n", err);
117					perf_sample__exit(&sample);
118					goto out_delete_evlist;
119				}
120
121				tp_flags = evsel__intval(evsel, &sample, "flags");
122				perf_sample__exit(&sample);
123				if (flags != tp_flags) {
124					pr_debug("%s: Expected flags=%#x, got %#x\n",
125						 __func__, flags, tp_flags);
126					goto out_delete_evlist;
127				}
128
129				goto out_ok;
130			}
131			perf_mmap__read_done(&md->core);
132		}
133
134		if (nr_events == before)
135			evlist__poll(evlist, 10);
136
137		if (++nr_polls > 5) {
138			pr_debug("%s: no events!\n", __func__);
139			goto out_delete_evlist;
140		}
141	}
142out_ok:
143	ret = TEST_OK;
144out_delete_evlist:
145	evlist__delete(evlist);
146out:
147	return ret;
148}
149
150static struct test_case tests__syscall_openat_tp_fields[] = {
151	TEST_CASE_REASON("syscalls:sys_enter_openat event fields",
152			 syscall_openat_tp_fields,
153			 "permissions"),
154	{	.name = NULL, }
155};
156
157struct test_suite suite__syscall_openat_tp_fields = {
158	.desc = "syscalls:sys_enter_openat event fields",
159	.test_cases = tests__syscall_openat_tp_fields,
160};