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(int subtest __maybe_unused)
 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	char sbuf[STRERR_BUFSIZE];
 46	struct cpu_map *cpus;
 47	struct thread_map *threads;
 48
 49	signal(SIGCHLD, sig_handler);
 50
 51	evlist = perf_evlist__new_default();
 52	if (evlist == NULL) {
 53		pr_debug("perf_evlist__new_default\n");
 54		return -1;
 55	}
 56
 57	/*
 58	 * Create maps of threads and cpus to monitor. In this case
 59	 * we start with all threads and cpus (-1, -1) but then in
 60	 * perf_evlist__prepare_workload we'll fill in the only thread
 61	 * we're monitoring, the one forked there.
 62	 */
 63	cpus = cpu_map__dummy_new();
 64	threads = thread_map__new_by_tid(-1);
 65	if (!cpus || !threads) {
 66		err = -ENOMEM;
 67		pr_debug("Not enough memory to create thread/cpu maps\n");
 68		goto out_free_maps;
 69	}
 70
 71	perf_evlist__set_maps(evlist, cpus, threads);
 72
 73	cpus	= NULL;
 74	threads = NULL;
 75
 76	err = perf_evlist__prepare_workload(evlist, &target, argv, false,
 77					    workload_exec_failed_signal);
 78	if (err < 0) {
 79		pr_debug("Couldn't run the workload!\n");
 80		goto out_delete_evlist;
 81	}
 82
 83	evsel = perf_evlist__first(evlist);
 84	evsel->attr.task = 1;
 85	evsel->attr.sample_freq = 0;
 86	evsel->attr.inherit = 0;
 87	evsel->attr.watermark = 0;
 88	evsel->attr.wakeup_events = 1;
 89	evsel->attr.exclude_kernel = 1;
 90
 91	err = perf_evlist__open(evlist);
 92	if (err < 0) {
 93		pr_debug("Couldn't open the evlist: %s\n",
 94			 strerror_r(-err, sbuf, sizeof(sbuf)));
 95		goto out_delete_evlist;
 96	}
 97
 98	if (perf_evlist__mmap(evlist, 128, true) < 0) {
 99		pr_debug("failed to mmap events: %d (%s)\n", errno,
100			 strerror_r(errno, sbuf, sizeof(sbuf)));
101		goto out_delete_evlist;
102	}
103
104	perf_evlist__start_workload(evlist);
105
106retry:
107	while ((event = perf_evlist__mmap_read(evlist, 0)) != NULL) {
108		if (event->header.type == PERF_RECORD_EXIT)
109			nr_exit++;
110
111		perf_evlist__mmap_consume(evlist, 0);
112	}
113
114	if (!exited || !nr_exit) {
115		perf_evlist__poll(evlist, -1);
116		goto retry;
117	}
118
119	if (nr_exit != 1) {
120		pr_debug("received %d EXIT records\n", nr_exit);
121		err = -1;
122	}
123
124out_free_maps:
125	cpu_map__put(cpus);
126	thread_map__put(threads);
127out_delete_evlist:
128	perf_evlist__delete(evlist);
129	return err;
130}