1#include "thread_map.h"
2#include "evsel.h"
3#include "debug.h"
4#include "tests.h"
5
6int test__open_syscall_event(void)
7{
8	int err = -1, fd;
9	struct perf_evsel *evsel;
10	unsigned int nr_open_calls = 111, i;
11	struct thread_map *threads = thread_map__new(-1, getpid(), UINT_MAX);
12	char sbuf[STRERR_BUFSIZE];
13
14	if (threads == NULL) {
15		pr_debug("thread_map__new\n");
16		return -1;
17	}
18
19	evsel = perf_evsel__newtp("syscalls", "sys_enter_open");
20	if (evsel == NULL) {
21		if (tracefs_configured())
22			pr_debug("is tracefs mounted on /sys/kernel/tracing?\n");
23		else if (debugfs_configured())
24			pr_debug("is debugfs mounted on /sys/kernel/debug?\n");
25		else
26			pr_debug("Neither tracefs or debugfs is enabled in this kernel\n");
27		goto out_thread_map_delete;
28	}
29
30	if (perf_evsel__open_per_thread(evsel, threads) < 0) {
31		pr_debug("failed to open counter: %s, "
32			 "tweak /proc/sys/kernel/perf_event_paranoid?\n",
33			 strerror_r(errno, sbuf, sizeof(sbuf)));
34		goto out_evsel_delete;
35	}
36
37	for (i = 0; i < nr_open_calls; ++i) {
38		fd = open("/etc/passwd", O_RDONLY);
39		close(fd);
40	}
41
42	if (perf_evsel__read_on_cpu(evsel, 0, 0) < 0) {
43		pr_debug("perf_evsel__read_on_cpu\n");
44		goto out_close_fd;
45	}
46
47	if (evsel->counts->cpu[0].val != nr_open_calls) {
48		pr_debug("perf_evsel__read_on_cpu: expected to intercept %d calls, got %" PRIu64 "\n",
49			 nr_open_calls, evsel->counts->cpu[0].val);
50		goto out_close_fd;
51	}
52
53	err = 0;
54out_close_fd:
55	perf_evsel__close_fd(evsel, 1, threads->nr);
56out_evsel_delete:
57	perf_evsel__delete(evsel);
58out_thread_map_delete:
59	thread_map__delete(threads);
60	return err;
61}
62