tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1#include <errno.h>
2#include <inttypes.h>
3#include <api/fs/tracing_path.h>
4#include <linux/err.h>
5#include <sys/types.h>
6#include <sys/stat.h>
7#include <fcntl.h>
8#include "thread_map.h"
9#include "evsel.h"
10#include "debug.h"
11#include "tests.h"
12
13int test__openat_syscall_event(int subtest __maybe_unused)
14{
15 int err = -1, fd;
16 struct perf_evsel *evsel;
17 unsigned int nr_openat_calls = 111, i;
18 struct thread_map *threads = thread_map__new(-1, getpid(), UINT_MAX);
19 char sbuf[STRERR_BUFSIZE];
20 char errbuf[BUFSIZ];
21
22 if (threads == NULL) {
23 pr_debug("thread_map__new\n");
24 return -1;
25 }
26
27 evsel = perf_evsel__newtp("syscalls", "sys_enter_openat");
28 if (IS_ERR(evsel)) {
29 tracing_path__strerror_open_tp(errno, errbuf, sizeof(errbuf), "syscalls", "sys_enter_openat");
30 pr_debug("%s\n", errbuf);
31 goto out_thread_map_delete;
32 }
33
34 if (perf_evsel__open_per_thread(evsel, threads) < 0) {
35 pr_debug("failed to open counter: %s, "
36 "tweak /proc/sys/kernel/perf_event_paranoid?\n",
37 str_error_r(errno, sbuf, sizeof(sbuf)));
38 goto out_evsel_delete;
39 }
40
41 for (i = 0; i < nr_openat_calls; ++i) {
42 fd = openat(0, "/etc/passwd", O_RDONLY);
43 close(fd);
44 }
45
46 if (perf_evsel__read_on_cpu(evsel, 0, 0) < 0) {
47 pr_debug("perf_evsel__read_on_cpu\n");
48 goto out_close_fd;
49 }
50
51 if (perf_counts(evsel->counts, 0, 0)->val != nr_openat_calls) {
52 pr_debug("perf_evsel__read_on_cpu: expected to intercept %d calls, got %" PRIu64 "\n",
53 nr_openat_calls, perf_counts(evsel->counts, 0, 0)->val);
54 goto out_close_fd;
55 }
56
57 err = 0;
58out_close_fd:
59 perf_evsel__close_fd(evsel, 1, threads->nr);
60out_evsel_delete:
61 perf_evsel__delete(evsel);
62out_thread_map_delete:
63 thread_map__put(threads);
64 return err;
65}