1 // SPDX-License-Identifier: GPL-2.0 2 #include <errno.h> 3 #include <inttypes.h> 4 #include <api/fs/tracing_path.h> 5 #include <linux/err.h> 6 #include <sys/types.h> 7 #include <sys/stat.h> 8 #include <fcntl.h> 9 #include "thread_map.h" 10 #include "evsel.h" 11 #include "debug.h" 12 #include "tests.h" 13 #include "util/counts.h" 14 15 int test__openat_syscall_event(struct test *test __maybe_unused, int subtest __maybe_unused) 16 { 17 int err = -1, fd; 18 struct evsel *evsel; 19 unsigned int nr_openat_calls = 111, i; 20 struct perf_thread_map *threads = thread_map__new(-1, getpid(), UINT_MAX); 21 char sbuf[STRERR_BUFSIZE]; 22 char errbuf[BUFSIZ]; 23 24 if (threads == NULL) { 25 pr_debug("thread_map__new\n"); 26 return -1; 27 } 28 29 evsel = perf_evsel__newtp("syscalls", "sys_enter_openat"); 30 if (IS_ERR(evsel)) { 31 tracing_path__strerror_open_tp(errno, errbuf, sizeof(errbuf), "syscalls", "sys_enter_openat"); 32 pr_debug("%s\n", errbuf); 33 goto out_thread_map_delete; 34 } 35 36 if (perf_evsel__open_per_thread(evsel, threads) < 0) { 37 pr_debug("failed to open counter: %s, " 38 "tweak /proc/sys/kernel/perf_event_paranoid?\n", 39 str_error_r(errno, sbuf, sizeof(sbuf))); 40 goto out_evsel_delete; 41 } 42 43 for (i = 0; i < nr_openat_calls; ++i) { 44 fd = openat(0, "/etc/passwd", O_RDONLY); 45 close(fd); 46 } 47 48 if (perf_evsel__read_on_cpu(evsel, 0, 0) < 0) { 49 pr_debug("perf_evsel__read_on_cpu\n"); 50 goto out_close_fd; 51 } 52 53 if (perf_counts(evsel->counts, 0, 0)->val != nr_openat_calls) { 54 pr_debug("perf_evsel__read_on_cpu: expected to intercept %d calls, got %" PRIu64 "\n", 55 nr_openat_calls, perf_counts(evsel->counts, 0, 0)->val); 56 goto out_close_fd; 57 } 58 59 err = 0; 60 out_close_fd: 61 perf_evsel__close_fd(&evsel->core); 62 out_evsel_delete: 63 evsel__delete(evsel); 64 out_thread_map_delete: 65 perf_thread_map__put(threads); 66 return err; 67 } 68