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- # -*- coding: utf-8 -*-
- """
- Ftrace built-in backend.
- """
- __author__ = "Eiichi Tsukata <eiichi.tsukata.xh@hitachi.com>"
- __copyright__ = "Copyright (C) 2013 Hitachi, Ltd."
- __license__ = "GPL version 2 or (at your option) any later version"
- __maintainer__ = "Stefan Hajnoczi"
- __email__ = "stefanha@redhat.com"
- from tracetool import out
- PUBLIC = True
- def generate_h_begin(events, group):
- out('#include "trace/ftrace.h"',
- '')
- def generate_h(event, group):
- argnames = ", ".join(event.args.names())
- if len(event.args) > 0:
- argnames = ", " + argnames
- out(' {',
- ' char ftrace_buf[MAX_TRACE_STRLEN];',
- ' int unused __attribute__ ((unused));',
- ' int trlen;',
- ' if (trace_event_get_state(%(event_id)s)) {',
- ' trlen = snprintf(ftrace_buf, MAX_TRACE_STRLEN,',
- ' "%(name)s " %(fmt)s "\\n" %(argnames)s);',
- ' trlen = MIN(trlen, MAX_TRACE_STRLEN - 1);',
- ' unused = write(trace_marker_fd, ftrace_buf, trlen);',
- ' }',
- ' }',
- name=event.name,
- args=event.args,
- event_id="TRACE_" + event.name.upper(),
- fmt=event.fmt.rstrip("\n"),
- argnames=argnames)
- def generate_h_backend_dstate(event, group):
- out(' trace_event_get_state_dynamic_by_id(%(event_id)s) || \\',
- event_id="TRACE_" + event.name.upper())
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