1#!/usr/bin/env python 2# -*- coding: utf-8 -*- 3 4""" 5Ftrace built-in backend. 6""" 7 8__author__ = "Eiichi Tsukata <eiichi.tsukata.xh@hitachi.com>" 9__copyright__ = "Copyright (C) 2013 Hitachi, Ltd." 10__license__ = "GPL version 2 or (at your option) any later version" 11 12__maintainer__ = "Stefan Hajnoczi" 13__email__ = "stefanha@redhat.com" 14 15 16from tracetool import out 17 18 19PUBLIC = True 20 21 22def generate_h_begin(events): 23 out('#include "trace/ftrace.h"', 24 '#include "trace/control.h"', 25 '') 26 27 28def generate_h(event): 29 argnames = ", ".join(event.args.names()) 30 if len(event.args) > 0: 31 argnames = ", " + argnames 32 33 out(' {', 34 ' char ftrace_buf[MAX_TRACE_STRLEN];', 35 ' int unused __attribute__ ((unused));', 36 ' int trlen;', 37 ' if (trace_event_get_state(%(event_id)s)) {', 38 ' trlen = snprintf(ftrace_buf, MAX_TRACE_STRLEN,', 39 ' "%(name)s " %(fmt)s "\\n" %(argnames)s);', 40 ' trlen = MIN(trlen, MAX_TRACE_STRLEN - 1);', 41 ' unused = write(trace_marker_fd, ftrace_buf, trlen);', 42 ' }', 43 ' }', 44 name=event.name, 45 args=event.args, 46 event_id="TRACE_" + event.name.upper(), 47 fmt=event.fmt.rstrip("\n"), 48 argnames=argnames) 49