mirror of
https://github.com/xemu-project/xemu.git
synced 2024-11-27 05:20:50 +00:00
ddde8acc98
Disable trace events prefixed with a '-'. Useful to enable a group of tracepoints with exceptions, like this: usb_xhci_port_* -usb_xhci_port_read which will enable all xhci port tracepoints except reads. Signed-off-by: Gerd Hoffmann <kraxel@redhat.com> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
53 lines
1.4 KiB
C
53 lines
1.4 KiB
C
/*
|
|
* Interface for configuring and controlling the state of tracing events.
|
|
*
|
|
* Copyright (C) 2011 Lluís Vilanova <vilanova@ac.upc.edu>
|
|
*
|
|
* This work is licensed under the terms of the GNU GPL, version 2. See
|
|
* the COPYING file in the top-level directory.
|
|
*/
|
|
|
|
#include "trace/control.h"
|
|
|
|
|
|
void trace_backend_init_events(const char *fname)
|
|
{
|
|
int ret;
|
|
|
|
if (fname == NULL) {
|
|
return;
|
|
}
|
|
|
|
FILE *fp = fopen(fname, "r");
|
|
if (!fp) {
|
|
fprintf(stderr, "error: could not open trace events file '%s': %s\n",
|
|
fname, strerror(errno));
|
|
exit(1);
|
|
}
|
|
char line_buf[1024];
|
|
while (fgets(line_buf, sizeof(line_buf), fp)) {
|
|
size_t len = strlen(line_buf);
|
|
if (len > 1) { /* skip empty lines */
|
|
line_buf[len - 1] = '\0';
|
|
if ('#' == line_buf[0]) { /* skip commented lines */
|
|
continue;
|
|
}
|
|
if ('-' == line_buf[0]) {
|
|
ret = trace_event_set_state(line_buf+1, false);
|
|
} else {
|
|
ret = trace_event_set_state(line_buf, true);
|
|
}
|
|
if (!ret) {
|
|
fprintf(stderr,
|
|
"error: trace event '%s' does not exist\n", line_buf);
|
|
exit(1);
|
|
}
|
|
}
|
|
}
|
|
if (fclose(fp) != 0) {
|
|
fprintf(stderr, "error: closing file '%s': %s\n",
|
|
fname, strerror(errno));
|
|
exit(1);
|
|
}
|
|
}
|