trace/control.h

   1 /*
   2  * Interface for configuring and controlling the state of tracing events.
   3  *
   4  * Copyright (C) 2011 Lluís Vilanova <vilanova@ac.upc.edu>
   5  *
   6  * This work is licensed under the terms of the GNU GPL, version 2.  See
   7  * the COPYING file in the top-level directory.
   8  */
   9
  10 #ifndef TRACE_CONTROL_H
  11 #define TRACE_CONTROL_H
  12
  13 #include "qemu-common.h"
  14
  15
  16 /** Print the state of all events. */
  17 void trace_print_events(FILE *stream, fprintf_function stream_printf);
  18 /** Set the state of an event.
  19  *
  20  * @return Whether the state changed.
  21  */
  22 bool trace_event_set_state(const char *name, bool state);
  23
  24
  25 /** Initialize the tracing backend.
  26  *
  27  * @events Name of file with events to be enabled at startup; may be NULL.
  28  *         Corresponds to commandline option "-trace events=...".
  29  * @file   Name of trace output file; may be NULL.
  30  *         Corresponds to commandline option "-trace file=...".
  31  * @return Whether the backend could be successfully initialized.
  32  */
  33 bool trace_backend_init(const char *events, const char *file);
  34
  35 /** Generic function to initialize the state of events.
  36  *
  37  * @fname Name of file with events to enable; may be NULL.
  38  */
  39 void trace_backend_init_events(const char *fname);
  40
  41 #endif  /* TRACE_CONTROL_H */