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 <errno.h>
15 
16 #ifndef O_DIRECTORY
17 #define O_DIRECTORY    00200000
18 #endif
19 #ifndef AT_FDCWD
20 #define AT_FDCWD       -100
21 #endif
22 
23 int test__syscall_openat_tp_fields(struct test *test __maybe_unused, int subtest __maybe_unused)
24 {
25 	struct record_opts opts = {
26 		.target = {
27 			.uid = UINT_MAX,
28 			.uses_mmap = true,
29 		},
30 		.no_buffering = true,
31 		.freq	      = 1,
32 		.mmap_pages   = 256,
33 		.raw_samples  = true,
34 	};
35 	const char *filename = "/etc/passwd";
36 	int flags = O_RDONLY | O_DIRECTORY;
37 	struct evlist *evlist = evlist__new();
38 	struct evsel *evsel;
39 	int err = -1, i, nr_events = 0, nr_polls = 0;
40 	char sbuf[STRERR_BUFSIZE];
41 
42 	if (evlist == NULL) {
43 		pr_debug("%s: perf_evlist__new\n", __func__);
44 		goto out;
45 	}
46 
47 	evsel = perf_evsel__newtp("syscalls", "sys_enter_openat");
48 	if (IS_ERR(evsel)) {
49 		pr_debug("%s: perf_evsel__newtp\n", __func__);
50 		goto out_delete_evlist;
51 	}
52 
53 	evlist__add(evlist, evsel);
54 
55 	err = perf_evlist__create_maps(evlist, &opts.target);
56 	if (err < 0) {
57 		pr_debug("%s: perf_evlist__create_maps\n", __func__);
58 		goto out_delete_evlist;
59 	}
60 
61 	perf_evsel__config(evsel, &opts, NULL);
62 
63 	perf_thread_map__set_pid(evlist->core.threads, 0, getpid());
64 
65 	err = evlist__open(evlist);
66 	if (err < 0) {
67 		pr_debug("perf_evlist__open: %s\n",
68 			 str_error_r(errno, sbuf, sizeof(sbuf)));
69 		goto out_delete_evlist;
70 	}
71 
72 	err = perf_evlist__mmap(evlist, UINT_MAX);
73 	if (err < 0) {
74 		pr_debug("perf_evlist__mmap: %s\n",
75 			 str_error_r(errno, sbuf, sizeof(sbuf)));
76 		goto out_delete_evlist;
77 	}
78 
79 	evlist__enable(evlist);
80 
81 	/*
82 	 * Generate the event:
83 	 */
84 	openat(AT_FDCWD, filename, flags);
85 
86 	while (1) {
87 		int before = nr_events;
88 
89 		for (i = 0; i < evlist->nr_mmaps; i++) {
90 			union perf_event *event;
91 			struct perf_mmap *md;
92 
93 			md = &evlist->mmap[i];
94 			if (perf_mmap__read_init(md) < 0)
95 				continue;
96 
97 			while ((event = perf_mmap__read_event(md)) != NULL) {
98 				const u32 type = event->header.type;
99 				int tp_flags;
100 				struct perf_sample sample;
101 
102 				++nr_events;
103 
104 				if (type != PERF_RECORD_SAMPLE) {
105 					perf_mmap__consume(md);
106 					continue;
107 				}
108 
109 				err = perf_evsel__parse_sample(evsel, event, &sample);
110 				if (err) {
111 					pr_debug("Can't parse sample, err = %d\n", err);
112 					goto out_delete_evlist;
113 				}
114 
115 				tp_flags = perf_evsel__intval(evsel, &sample, "flags");
116 
117 				if (flags != tp_flags) {
118 					pr_debug("%s: Expected flags=%#x, got %#x\n",
119 						 __func__, flags, tp_flags);
120 					goto out_delete_evlist;
121 				}
122 
123 				goto out_ok;
124 			}
125 			perf_mmap__read_done(md);
126 		}
127 
128 		if (nr_events == before)
129 			perf_evlist__poll(evlist, 10);
130 
131 		if (++nr_polls > 5) {
132 			pr_debug("%s: no events!\n", __func__);
133 			goto out_delete_evlist;
134 		}
135 	}
136 out_ok:
137 	err = 0;
138 out_delete_evlist:
139 	evlist__delete(evlist);
140 out:
141 	return err;
142 }
143