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trace: print a warning if user tries to enable an unknown trace event

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There was no warning if a bad trace event name was given to
'trace-event' command, thus the user could think that the command
was successful even if this was not the case.

Print a warning if the user tries to enable a trace event which is not
known.

Acked-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
This commit is contained in:
Blue Swirl 2010-10-13 19:14:29 +00:00
parent 2abf314ddd
commit f871d6893a
3 changed files with 9 additions and 3 deletions
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6
monitor.c
View File

@ -549,7 +549,11 @@ static void do_change_trace_event_state(Monitor *mon, const QDict *qdict)
{
const char *tp_name = qdict_get_str(qdict, "name");
bool new_state = qdict_get_bool(qdict, "option");
st_change_trace_event_state(tp_name, new_state);
int ret = st_change_trace_event_state(tp_name, new_state);
if (!ret) {
monitor_printf(mon, "unknown event name \"%s\"\n", tp_name);
}
}
static void do_trace_file(Monitor *mon, const QDict *qdict)

4
simpletrace.c
View File

@ -246,12 +246,14 @@ static TraceEvent* find_trace_event_by_name(const char *tname)
return NULL; /* indicates end of list reached without a match */
}
void st_change_trace_event_state(const char *tname, bool tstate)
bool st_change_trace_event_state(const char *tname, bool tstate)
{
TraceEvent *tp;
tp = find_trace_event_by_name(tname);
if (tp) {
tp->state = tstate;
return true;
}
return false;
}

2
simpletrace.h
View File

@ -31,7 +31,7 @@ void trace5(TraceEventID event, uint64_t x1, uint64_t x2, uint64_t x3, uint64_t
void trace6(TraceEventID event, uint64_t x1, uint64_t x2, uint64_t x3, uint64_t x4, uint64_t x5, uint64_t x6);
void st_print_trace(FILE *stream, int (*stream_printf)(FILE *stream, const char *fmt, ...));
void st_print_trace_events(FILE *stream, int (*stream_printf)(FILE *stream, const char *fmt, ...));
void st_change_trace_event_state(const char *tname, bool tstate);
bool st_change_trace_event_state(const char *tname, bool tstate);
void st_print_trace_file_status(FILE *stream, int (*stream_printf)(FILE *stream, const char *fmt, ...));
void st_set_trace_file_enabled(bool enable);
bool st_set_trace_file(const char *file);