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 13 int 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; 58 out_close_fd: 59 perf_evsel__close_fd(evsel, 1, threads->nr); 60 out_evsel_delete: 61 perf_evsel__delete(evsel); 62 out_thread_map_delete: 63 thread_map__put(threads); 64 return err; 65 } 66