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