1// SPDX-License-Identifier: GPL-2.0
  2#include <linux/err.h>
  3#include <sys/types.h>
  4#include <sys/stat.h>
  5#include <fcntl.h>
  6#include "perf.h"
  7#include "evlist.h"
  8#include "evsel.h"
  9#include "thread_map.h"
 10#include "tests.h"
 11#include "debug.h"
 12#include <errno.h>
 13
 14#ifndef O_DIRECTORY
 15#define O_DIRECTORY    00200000
 16#endif
 17#ifndef AT_FDCWD
 18#define AT_FDCWD       -100
 19#endif
 20
 21int test__syscall_openat_tp_fields(struct test *test __maybe_unused, int subtest __maybe_unused)
 22{
 23	struct record_opts opts = {
 24		.target = {
 25			.uid = UINT_MAX,
 26			.uses_mmap = true,
 27		},
 28		.no_buffering = true,
 29		.freq	      = 1,
 30		.mmap_pages   = 256,
 31		.raw_samples  = true,
 32	};
 33	const char *filename = "/etc/passwd";
 34	int flags = O_RDONLY | O_DIRECTORY;
 35	struct perf_evlist *evlist = perf_evlist__new();
 36	struct perf_evsel *evsel;
 37	int err = -1, i, nr_events = 0, nr_polls = 0;
 38	char sbuf[STRERR_BUFSIZE];
 39
 40	if (evlist == NULL) {
 41		pr_debug("%s: perf_evlist__new\n", __func__);
 42		goto out;
 43	}
 44
 45	evsel = perf_evsel__newtp("syscalls", "sys_enter_openat");
 46	if (IS_ERR(evsel)) {
 47		pr_debug("%s: perf_evsel__newtp\n", __func__);
 48		goto out_delete_evlist;
 49	}
 50
 51	perf_evlist__add(evlist, evsel);
 52
 53	err = perf_evlist__create_maps(evlist, &opts.target);
 54	if (err < 0) {
 55		pr_debug("%s: perf_evlist__create_maps\n", __func__);
 56		goto out_delete_evlist;
 57	}
 58
 59	perf_evsel__config(evsel, &opts, NULL);
 60
 61	thread_map__set_pid(evlist->threads, 0, getpid());
 62
 63	err = perf_evlist__open(evlist);
 64	if (err < 0) {
 65		pr_debug("perf_evlist__open: %s\n",
 66			 str_error_r(errno, sbuf, sizeof(sbuf)));
 67		goto out_delete_evlist;
 68	}
 69
 70	err = perf_evlist__mmap(evlist, UINT_MAX);
 71	if (err < 0) {
 72		pr_debug("perf_evlist__mmap: %s\n",
 73			 str_error_r(errno, sbuf, sizeof(sbuf)));
 74		goto out_delete_evlist;
 75	}
 76
 77	perf_evlist__enable(evlist);
 78
 79	/*
 80	 * Generate the event:
 81	 */
 82	openat(AT_FDCWD, filename, flags);
 83
 84	while (1) {
 85		int before = nr_events;
 86
 87		for (i = 0; i < evlist->nr_mmaps; i++) {
 88			union perf_event *event;
 89			struct perf_mmap *md;
 90
 91			md = &evlist->mmap[i];
 92			if (perf_mmap__read_init(md) < 0)
 93				continue;
 94
 95			while ((event = perf_mmap__read_event(md)) != NULL) {
 96				const u32 type = event->header.type;
 97				int tp_flags;
 98				struct perf_sample sample;
 99
100				++nr_events;
101
102				if (type != PERF_RECORD_SAMPLE) {
103					perf_mmap__consume(md);
104					continue;
105				}
106
107				err = perf_evsel__parse_sample(evsel, event, &sample);
108				if (err) {
109					pr_debug("Can't parse sample, err = %d\n", err);
110					goto out_delete_evlist;
111				}
112
113				tp_flags = perf_evsel__intval(evsel, &sample, "flags");
114
115				if (flags != tp_flags) {
116					pr_debug("%s: Expected flags=%#x, got %#x\n",
117						 __func__, flags, tp_flags);
118					goto out_delete_evlist;
119				}
120
121				goto out_ok;
122			}
123			perf_mmap__read_done(md);
124		}
125
126		if (nr_events == before)
127			perf_evlist__poll(evlist, 10);
128
129		if (++nr_polls > 5) {
130			pr_debug("%s: no events!\n", __func__);
131			goto out_delete_evlist;
132		}
133	}
134out_ok:
135	err = 0;
136out_delete_evlist:
137	perf_evlist__delete(evlist);
138out:
139	return err;
140}