// SPDX-License-Identifier: GPL-2.0#include "debug.h"#include "evlist.h"#include "evsel.h"#include "target.h"#include "thread_map.h"#include "tests.h"#include "util/mmap.h" #include <errno.h>#include <signal.h>#include <linux/string.h>#include <perf/cpumap.h>#include <perf/evlist.h>#include <perf/mmap.h> static int exited;static int nr_exit; static void sig_handler(int sig __maybe_unused){	exited = 1;} /* * perf_evlist__prepare_workload will send a SIGUSR1 if the fork fails, since * we asked by setting its exec_error to this handler. */static void workload_exec_failed_signal(int signo __maybe_unused,					siginfo_t *info __maybe_unused,					void *ucontext __maybe_unused){	exited	= 1;	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(struct test *test __maybe_unused, int subtest __maybe_unused){	int err = -1;	union perf_event *event;	struct evsel *evsel;	struct evlist *evlist;	struct target target = {		.uid		= UINT_MAX,		.uses_mmap	= true,	};	const char *argv[] = { "true", NULL };	char sbuf[STRERR_BUFSIZE];	struct perf_cpu_map *cpus;	struct perf_thread_map *threads;	struct mmap *md;	int retry_count = 0; 	signal(SIGCHLD, 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.	 */	cpus = perf_cpu_map__dummy_new();	threads = thread_map__new_by_tid(-1);	if (!cpus || !threads) {		err = -ENOMEM;		pr_debug("Not enough memory to create thread/cpu maps\n");		goto out_free_maps;	} 	perf_evlist__set_maps(&evlist->core, cpus, threads); 	cpus	= NULL;	threads = NULL; 	err = perf_evlist__prepare_workload(evlist, &target, argv, false,					    workload_exec_failed_signal);	if (err < 0) {		pr_debug("Couldn't run the workload!\n");		goto out_delete_evlist;	} 	evsel = evlist__first(evlist);	evsel->core.attr.task = 1;#ifdef __s390x__	evsel->core.attr.sample_freq = 1000000;#else	evsel->core.attr.sample_freq = 1;#endif	evsel->core.attr.inherit = 0;	evsel->core.attr.watermark = 0;	evsel->core.attr.wakeup_events = 1;	evsel->core.attr.exclude_kernel = 1; 	err = evlist__open(evlist);	if (err < 0) {		pr_debug("Couldn't open the evlist: %s\n",			 str_error_r(-err, sbuf, sizeof(sbuf)));		goto out_delete_evlist;	} 	if (evlist__mmap(evlist, 128) < 0) {		pr_debug("failed to mmap events: %d (%s)\n", errno,			 str_error_r(errno, sbuf, sizeof(sbuf)));		err = -1;		goto out_delete_evlist;	} 	perf_evlist__start_workload(evlist); retry:	md = &evlist->mmap[0];	if (perf_mmap__read_init(&md->core) < 0)		goto out_init; 	while ((event = perf_mmap__read_event(&md->core)) != NULL) {		if (event->header.type == PERF_RECORD_EXIT)			nr_exit++; 		perf_mmap__consume(&md->core);	}	perf_mmap__read_done(&md->core); out_init:	if (!exited || !nr_exit) {		evlist__poll(evlist, -1); 		if (retry_count++ > 1000) {			pr_debug("Failed after retrying 1000 times\n");			err = -1;			goto out_free_maps;		} 		goto retry;	} 	if (nr_exit != 1) {		pr_debug("received %d EXIT records\n", nr_exit);		err = -1;	} out_free_maps:	perf_cpu_map__put(cpus);	perf_thread_map__put(threads);out_delete_evlist:	evlist__delete(evlist);	return err;}