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