9 #include <linux/kernel.h>
10 #include <linux/err.h>
11 #include <traceevent/event-parse.h>
12 #include <api/fs/tracing_path.h>
13 #include "trace-event.h"
18 * global trace_event object used by trace_event__tp_format
20 * TODO There's no cleanup call for this. Add some sort of
21 * __exit function support and call trace_event__cleanup
24 static struct trace_event tevent;
25 static bool tevent_initialized;
27 int trace_event__init(struct trace_event *t)
29 struct pevent *pevent = pevent_alloc();
32 t->plugin_list = traceevent_load_plugins(pevent);
36 return pevent ? 0 : -1;
39 static int trace_event__init2(void)
41 int be = traceevent_host_bigendian();
42 struct pevent *pevent;
44 if (trace_event__init(&tevent))
47 pevent = tevent.pevent;
48 pevent_set_flag(pevent, PEVENT_NSEC_OUTPUT);
49 pevent_set_file_bigendian(pevent, be);
50 pevent_set_host_bigendian(pevent, be);
51 tevent_initialized = true;
55 int trace_event__register_resolver(struct machine *machine,
56 pevent_func_resolver_t *func)
58 if (!tevent_initialized && trace_event__init2())
61 return pevent_set_function_resolver(tevent.pevent, func, machine);
64 void trace_event__cleanup(struct trace_event *t)
66 traceevent_unload_plugins(t->plugin_list, t->pevent);
67 pevent_free(t->pevent);
71 * Returns pointer with encoded error via <linux/err.h> interface.
73 static struct event_format*
74 tp_format(const char *sys, const char *name)
76 struct pevent *pevent = tevent.pevent;
77 struct event_format *event = NULL;
83 scnprintf(path, PATH_MAX, "%s/%s/%s/format",
84 tracing_events_path, sys, name);
86 err = filename__read_str(path, &data, &size);
90 pevent_parse_format(pevent, &event, data, size, sys);
97 * Returns pointer with encoded error via <linux/err.h> interface.
100 trace_event__tp_format(const char *sys, const char *name)
102 if (!tevent_initialized && trace_event__init2())
103 return ERR_PTR(-ENOMEM);
105 return tp_format(sys, name);