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      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 
      9 static int exited;
     10 static int nr_exit;
     11 
     12 static void sig_handler(int sig)
     13 {
     14 	exited = 1;
     15 
     16 	if (sig == SIGUSR1)
     17 		nr_exit = -1;
     18 }
     19 
     20 /*
     21  * This test will start a workload that does nothing then it checks
     22  * if the number of exit event reported by the kernel is 1 or not
     23  * in order to check the kernel returns correct number of event.
     24  */
     25 int test__task_exit(void)
     26 {
     27 	int err = -1;
     28 	union perf_event *event;
     29 	struct perf_evsel *evsel;
     30 	struct perf_evlist *evlist;
     31 	struct perf_target target = {
     32 		.uid		= UINT_MAX,
     33 		.uses_mmap	= true,
     34 	};
     35 	const char *argv[] = { "true", NULL };
     36 
     37 	signal(SIGCHLD, sig_handler);
     38 	signal(SIGUSR1, sig_handler);
     39 
     40 	evlist = perf_evlist__new();
     41 	if (evlist == NULL) {
     42 		pr_debug("perf_evlist__new\n");
     43 		return -1;
     44 	}
     45 	/*
     46 	 * We need at least one evsel in the evlist, use the default
     47 	 * one: "cycles".
     48 	 */
     49 	err = perf_evlist__add_default(evlist);
     50 	if (err < 0) {
     51 		pr_debug("Not enough memory to create evsel\n");
     52 		goto out_free_evlist;
     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_maps;
     67 	}
     68 
     69 	err = perf_evlist__prepare_workload(evlist, &target, argv, false, true);
     70 	if (err < 0) {
     71 		pr_debug("Couldn't run the workload!\n");
     72 		goto out_delete_maps;
     73 	}
     74 
     75 	evsel = perf_evlist__first(evlist);
     76 	evsel->attr.task = 1;
     77 	evsel->attr.sample_freq = 0;
     78 	evsel->attr.inherit = 0;
     79 	evsel->attr.watermark = 0;
     80 	evsel->attr.wakeup_events = 1;
     81 	evsel->attr.exclude_kernel = 1;
     82 
     83 	err = perf_evlist__open(evlist);
     84 	if (err < 0) {
     85 		pr_debug("Couldn't open the evlist: %s\n", strerror(-err));
     86 		goto out_delete_maps;
     87 	}
     88 
     89 	if (perf_evlist__mmap(evlist, 128, true) < 0) {
     90 		pr_debug("failed to mmap events: %d (%s)\n", errno,
     91 			 strerror(errno));
     92 		goto out_close_evlist;
     93 	}
     94 
     95 	perf_evlist__start_workload(evlist);
     96 
     97 retry:
     98 	while ((event = perf_evlist__mmap_read(evlist, 0)) != NULL) {
     99 		if (event->header.type == PERF_RECORD_EXIT)
    100 			nr_exit++;
    101 
    102 		perf_evlist__mmap_consume(evlist, 0);
    103 	}
    104 
    105 	if (!exited || !nr_exit) {
    106 		poll(evlist->pollfd, evlist->nr_fds, -1);
    107 		goto retry;
    108 	}
    109 
    110 	if (nr_exit != 1) {
    111 		pr_debug("received %d EXIT records\n", nr_exit);
    112 		err = -1;
    113 	}
    114 
    115 	perf_evlist__munmap(evlist);
    116 out_close_evlist:
    117 	perf_evlist__close(evlist);
    118 out_delete_maps:
    119 	perf_evlist__delete_maps(evlist);
    120 out_free_evlist:
    121 	perf_evlist__delete(evlist);
    122 	return err;
    123 }
    124