linux-vybrid_public/tools/perf/tests/util.c

#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include "tests.h"
#include "debugfs.h"

int trace_event__id(const char *evname)
{
	char *filename;
	int err = -1, fd;

	if (asprintf(&filename,
		     "%s/syscalls/%s/id",
		     tracing_events_path, evname) < 0)
		return -1;

	fd = open(filename, O_RDONLY);
	if (fd >= 0) {
		char id[16];
		if (read(fd, id, sizeof(id)) > 0)
			err = atoi(id);
		close(fd);
	}

	free(filename);
	return err;
}