alistair23-linux/tools/perf/builtin-evlist.c

/*
 * Builtin evlist command: Show the list of event selectors present
 * in a perf.data file.
 */
#include "builtin.h"

#include "util/util.h"

#include <linux/list.h>

#include "perf.h"
#include "util/evlist.h"
#include "util/evsel.h"
#include "util/parse-events.h"
#include "util/parse-options.h"
#include "util/session.h"
#include "util/data.h"

static int __cmd_evlist(const char *file_name, struct perf_attr_details *details)
{
	struct perf_session *session;
	struct perf_evsel *pos;
	struct perf_data_file file = {
		.path = file_name,
		.mode = PERF_DATA_MODE_READ,
	};

	session = perf_session__new(&file, 0, NULL);
	if (session == NULL)
		return -ENOMEM;

	evlist__for_each(session->evlist, pos)
		perf_evsel__fprintf(pos, details, stdout);

	perf_session__delete(session);
	return 0;
}

int cmd_evlist(int argc, const char **argv, const char *prefix __maybe_unused)
{
	struct perf_attr_details details = { .verbose = false, };
	const struct option options[] = {
	OPT_STRING('i', "input", &input_name, "file", "Input file name"),
	OPT_BOOLEAN('F', "freq", &details.freq, "Show the sample frequency"),
	OPT_BOOLEAN('v', "verbose", &details.verbose,
		    "Show all event attr details"),
	OPT_BOOLEAN('g', "group", &details.event_group,
		    "Show event group information"),
	OPT_END()
	};
	const char * const evlist_usage[] = {
		"perf evlist [<options>]",
		NULL
	};

	argc = parse_options(argc, argv, options, evlist_usage, 0);
	if (argc)
		usage_with_options(evlist_usage, options);

	if (details.event_group && (details.verbose || details.freq)) {
		pr_err("--group option is not compatible with other options\n");
		usage_with_options(evlist_usage, options);
	}

	return __cmd_evlist(input_name, &details);
}