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