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	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}
131