#include "evlist.h"#include "evsel.h"#include "thread_map.h"#include "cpumap.h"#include "tests.h" #include <signal.h> static int exited;static int nr_exit; static void sig_handler(int sig){	exited = 1; 	if (sig == SIGUSR1)		nr_exit = -1;} /* * This test will start a workload that does nothing then it checks * if the number of exit event reported by the kernel is 1 or not * in order to check the kernel returns correct number of event. */int test__task_exit(void){	int err = -1;	union perf_event *event;	struct perf_evsel *evsel;	struct perf_evlist *evlist;	struct target target = {		.uid		= UINT_MAX,		.uses_mmap	= true,	};	const char *argv[] = { "true", NULL }; 	signal(SIGCHLD, sig_handler);	signal(SIGUSR1, sig_handler); 	evlist = perf_evlist__new_default();	if (evlist == NULL) {		pr_debug("perf_evlist__new_default\n");		return -1;	} 	/*	 * Create maps of threads and cpus to monitor. In this case	 * we start with all threads and cpus (-1, -1) but then in	 * perf_evlist__prepare_workload we'll fill in the only thread	 * we're monitoring, the one forked there.	 */	evlist->cpus = cpu_map__dummy_new();	evlist->threads = thread_map__new_by_tid(-1);	if (!evlist->cpus || !evlist->threads) {		err = -ENOMEM;		pr_debug("Not enough memory to create thread/cpu maps\n");		goto out_delete_maps;	} 	err = perf_evlist__prepare_workload(evlist, &target, argv, false, true);	if (err < 0) {		pr_debug("Couldn't run the workload!\n");		goto out_delete_maps;	} 	evsel = perf_evlist__first(evlist);	evsel->attr.task = 1;	evsel->attr.sample_freq = 0;	evsel->attr.inherit = 0;	evsel->attr.watermark = 0;	evsel->attr.wakeup_events = 1;	evsel->attr.exclude_kernel = 1; 	err = perf_evlist__open(evlist);	if (err < 0) {		pr_debug("Couldn't open the evlist: %s\n", strerror(-err));		goto out_delete_maps;	} 	if (perf_evlist__mmap(evlist, 128, true) < 0) {		pr_debug("failed to mmap events: %d (%s)\n", errno,			 strerror(errno));		goto out_close_evlist;	} 	perf_evlist__start_workload(evlist); retry:	while ((event = perf_evlist__mmap_read(evlist, 0)) != NULL) {		if (event->header.type == PERF_RECORD_EXIT)			nr_exit++; 		perf_evlist__mmap_consume(evlist, 0);	} 	if (!exited || !nr_exit) {		poll(evlist->pollfd, evlist->nr_fds, -1);		goto retry;	} 	if (nr_exit != 1) {		pr_debug("received %d EXIT records\n", nr_exit);		err = -1;	} 	perf_evlist__munmap(evlist);out_close_evlist:	perf_evlist__close(evlist);out_delete_maps:	perf_evlist__delete_maps(evlist);	perf_evlist__delete(evlist);	return err;}