qemu/trace/stderr.c
Mark Wu 454e202d52 trace: Add wildcard trace event support
A basic wildcard matching is supported in both the monitor command
"trace-event" and the events list file. That means you can enable/disable
the events having a common prefix in a batch. For example, virtio-blk trace
events could be enabled using:
    trace-event virtio_blk_* on

Signed-off-by: Mark Wu <wudxw@linux.vnet.ibm.com>
Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
2011-11-01 14:12:15 +00:00

53 lines
1.3 KiB
C

#include "trace.h"
#include "trace/control.h"
void trace_print_events(FILE *stream, fprintf_function stream_printf)
{
unsigned int i;
for (i = 0; i < NR_TRACE_EVENTS; i++) {
stream_printf(stream, "%s [Event ID %u] : state %u\n",
trace_list[i].tp_name, i, trace_list[i].state);
}
}
bool trace_event_set_state(const char *name, bool state)
{
unsigned int i;
unsigned int len;
bool wildcard = false;
bool matched = false;
len = strlen(name);
if (len > 0 && name[len - 1] == '*') {
wildcard = true;
len -= 1;
}
for (i = 0; i < NR_TRACE_EVENTS; i++) {
if (wildcard) {
if (!strncmp(trace_list[i].tp_name, name, len)) {
trace_list[i].state = state;
matched = true;
}
continue;
}
if (!strcmp(trace_list[i].tp_name, name)) {
trace_list[i].state = state;
return true;
}
}
return matched;
}
bool trace_backend_init(const char *events, const char *file)
{
if (file) {
fprintf(stderr, "error: -trace file=...: "
"option not supported by the selected tracing backend\n");
return false;
}
trace_backend_init_events(events);
return true;
}