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 <linux/string.h> 7 #include <sys/types.h> 8 #include <sys/stat.h> 9 #include <fcntl.h> 10 #include "thread_map.h" 11 #include "evsel.h" 12 #include "debug.h" 13 #include "tests.h" 14 #include "util/counts.h" 15 16 int test__openat_syscall_event(struct test *test __maybe_unused, int subtest __maybe_unused) 17 { 18 int err = -1, fd; 19 struct evsel *evsel; 20 unsigned int nr_openat_calls = 111, i; 21 struct perf_thread_map *threads = thread_map__new(-1, getpid(), UINT_MAX); 22 char sbuf[STRERR_BUFSIZE]; 23 char errbuf[BUFSIZ]; 24 25 if (threads == NULL) { 26 pr_debug("thread_map__new\n"); 27 return -1; 28 } 29 30 evsel = perf_evsel__newtp("syscalls", "sys_enter_openat"); 31 if (IS_ERR(evsel)) { 32 tracing_path__strerror_open_tp(errno, errbuf, sizeof(errbuf), "syscalls", "sys_enter_openat"); 33 pr_debug("%s\n", errbuf); 34 goto out_thread_map_delete; 35 } 36 37 if (perf_evsel__open_per_thread(evsel, threads) < 0) { 38 pr_debug("failed to open counter: %s, " 39 "tweak /proc/sys/kernel/perf_event_paranoid?\n", 40 str_error_r(errno, sbuf, sizeof(sbuf))); 41 goto out_evsel_delete; 42 } 43 44 for (i = 0; i < nr_openat_calls; ++i) { 45 fd = openat(0, "/etc/passwd", O_RDONLY); 46 close(fd); 47 } 48 49 if (perf_evsel__read_on_cpu(evsel, 0, 0) < 0) { 50 pr_debug("perf_evsel__read_on_cpu\n"); 51 goto out_close_fd; 52 } 53 54 if (perf_counts(evsel->counts, 0, 0)->val != nr_openat_calls) { 55 pr_debug("perf_evsel__read_on_cpu: expected to intercept %d calls, got %" PRIu64 "\n", 56 nr_openat_calls, perf_counts(evsel->counts, 0, 0)->val); 57 goto out_close_fd; 58 } 59 60 err = 0; 61 out_close_fd: 62 perf_evsel__close_fd(&evsel->core); 63 out_evsel_delete: 64 evsel__delete(evsel); 65 out_thread_map_delete: 66 perf_thread_map__put(threads); 67 return err; 68 } 69