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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
/*
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* Interface for configuring and controlling the state of tracing events.
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*
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* Copyright (C) 2011 Lluís Vilanova <vilanova@ac.upc.edu>
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*
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* This work is licensed under the terms of the GNU GPL, version 2. See
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* the COPYING file in the top-level directory.
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*/
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#include "trace/control.h"
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void trace_backend_init_events(const char *fname)
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{
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int ret;
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if (fname == NULL) {
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return;
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}
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FILE *fp = fopen(fname, "r");
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if (!fp) {
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fprintf(stderr, "error: could not open trace events file '%s': %s\n",
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fname, strerror(errno));
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exit(1);
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}
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char line_buf[1024];
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while (fgets(line_buf, sizeof(line_buf), fp)) {
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size_t len = strlen(line_buf);
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if (len > 1) { /* skip empty lines */
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line_buf[len - 1] = '\0';
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if ('#' == line_buf[0]) { /* skip commented lines */
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continue;
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}
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if ('-' == line_buf[0]) {
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ret = trace_event_set_state(line_buf+1, false);
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} else {
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ret = trace_event_set_state(line_buf, true);
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}
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if (!ret) {
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fprintf(stderr,
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"error: trace event '%s' does not exist\n", line_buf);
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exit(1);
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}
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}
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}
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if (fclose(fp) != 0) {
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fprintf(stderr, "error: closing file '%s': %s\n",
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fname, strerror(errno));
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exit(1);
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}
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}
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