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tools lib traceevent: Add trace_seq_reset() 

Sometimes it'd be useful if existing trace_seq can be reused.  But
currently it's impossible since there's no API to reset the trace_seq.
Let's add trace_seq_reset() for this case.

Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Acked-by: Steven Rostedt <rostedt@goodmis.org>
Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Steven Rostedt <rostedt@goodmis.org>
Link: http://lkml.kernel.org/r/1370323231-14022-5-git-send-email-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Namhyung Kim 2013-06-04 14:20:19 +09:00 committed by Arnaldo Carvalho de Melo
parent 79d5adf06d
commit 6a48aec3a7
2 changed files with 14 additions and 0 deletions
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1
tools/lib/traceevent/event-parse.h
View File

@ -69,6 +69,7 @@ struct trace_seq {
};
void trace_seq_init(struct trace_seq *s);
void trace_seq_reset(struct trace_seq *s);
void trace_seq_destroy(struct trace_seq *s);
extern int trace_seq_printf(struct trace_seq *s, const char *fmt, ...)

13
tools/lib/traceevent/trace-seq.c
View File

@ -48,6 +48,19 @@ void trace_seq_init(struct trace_seq *s)
s->buffer = malloc_or_die(s->buffer_size);
}
/**
* trace_seq_reset - re-initialize the trace_seq structure
* @s: a pointer to the trace_seq structure to reset
*/
void trace_seq_reset(struct trace_seq *s)
{
if (!s)
return;
TRACE_SEQ_CHECK(s);
s->len = 0;
s->readpos = 0;
}
/**
* trace_seq_destroy - free up memory of a trace_seq
* @s: a pointer to the trace_seq to free the buffer