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