1#include "evlist.h"
  2#include "evsel.h"
  3#include "thread_map.h"
  4#include "cpumap.h"
  5#include "tests.h"
  6
  7#include <signal.h>
  8
  9static int exited;
 10static int nr_exit;
 11
 12static void sig_handler(int sig __maybe_unused)
 13{
 14	exited = 1;
 15}
 16
 17/*
 18 * perf_evlist__prepare_workload will send a SIGUSR1 if the fork fails, since
 19 * we asked by setting its exec_error to this handler.
 20 */
 21static void workload_exec_failed_signal(int signo __maybe_unused,
 22					siginfo_t *info __maybe_unused,
 23					void *ucontext __maybe_unused)
 24{
 25	exited	= 1;
 26	nr_exit = -1;
 27}
 28
 29/*
 30 * This test will start a workload that does nothing then it checks
 31 * if the number of exit event reported by the kernel is 1 or not
 32 * in order to check the kernel returns correct number of event.
 33 */
 34int test__task_exit(void)
 35{
 36	int err = -1;
 37	union perf_event *event;
 38	struct perf_evsel *evsel;
 39	struct perf_evlist *evlist;
 40	struct target target = {
 41		.uid		= UINT_MAX,
 42		.uses_mmap	= true,
 43	};
 44	const char *argv[] = { "true", NULL };
 45
 46	signal(SIGCHLD, sig_handler);
 47
 48	evlist = perf_evlist__new_default();
 49	if (evlist == NULL) {
 50		pr_debug("perf_evlist__new_default\n");
 51		return -1;
 52	}
 53
 54	/*
 55	 * Create maps of threads and cpus to monitor. In this case
 56	 * we start with all threads and cpus (-1, -1) but then in
 57	 * perf_evlist__prepare_workload we'll fill in the only thread
 58	 * we're monitoring, the one forked there.
 59	 */
 60	evlist->cpus = cpu_map__dummy_new();
 61	evlist->threads = thread_map__new_by_tid(-1);
 62	if (!evlist->cpus || !evlist->threads) {
 63		err = -ENOMEM;
 64		pr_debug("Not enough memory to create thread/cpu maps\n");
 65		goto out_delete_evlist;
 66	}
 67
 68	err = perf_evlist__prepare_workload(evlist, &target, argv, false,
 69					    workload_exec_failed_signal);
 70	if (err < 0) {
 71		pr_debug("Couldn't run the workload!\n");
 72		goto out_delete_evlist;
 73	}
 74
 75	evsel = perf_evlist__first(evlist);
 76	evsel->attr.task = 1;
 77	evsel->attr.sample_freq = 0;
 78	evsel->attr.inherit = 0;
 79	evsel->attr.watermark = 0;
 80	evsel->attr.wakeup_events = 1;
 81	evsel->attr.exclude_kernel = 1;
 82
 83	err = perf_evlist__open(evlist);
 84	if (err < 0) {
 85		pr_debug("Couldn't open the evlist: %s\n", strerror(-err));
 86		goto out_delete_evlist;
 87	}
 88
 89	if (perf_evlist__mmap(evlist, 128, true) < 0) {
 90		pr_debug("failed to mmap events: %d (%s)\n", errno,
 91			 strerror(errno));
 92		goto out_delete_evlist;
 93	}
 94
 95	perf_evlist__start_workload(evlist);
 96
 97retry:
 98	while ((event = perf_evlist__mmap_read(evlist, 0)) != NULL) {
 99		if (event->header.type == PERF_RECORD_EXIT)
100			nr_exit++;
101
102		perf_evlist__mmap_consume(evlist, 0);
103	}
104
105	if (!exited || !nr_exit) {
106		poll(evlist->pollfd, evlist->nr_fds, -1);
107		goto retry;
108	}
109
110	if (nr_exit != 1) {
111		pr_debug("received %d EXIT records\n", nr_exit);
112		err = -1;
113	}
114
115out_delete_evlist:
116	perf_evlist__delete(evlist);
117	return err;
118}