| |
| #include <stdio.h> |
| #include <unistd.h> |
| #include <stdlib.h> |
| #include <errno.h> |
| #include <sys/types.h> |
| #include <sys/stat.h> |
| #include <fcntl.h> |
| #include <linux/kernel.h> |
| #include <traceevent/event-parse.h> |
| #include <api/fs/tracing_path.h> |
| #include "trace-event.h" |
| #include "machine.h" |
| #include "util.h" |
| |
| /* |
| * global trace_event object used by trace_event__tp_format |
| * |
| * TODO There's no cleanup call for this. Add some sort of |
| * __exit function support and call trace_event__cleanup |
| * there. |
| */ |
| static struct trace_event tevent; |
| static bool tevent_initialized; |
| |
| int trace_event__init(struct trace_event *t) |
| { |
| struct pevent *pevent = pevent_alloc(); |
| |
| if (pevent) { |
| t->plugin_list = traceevent_load_plugins(pevent); |
| t->pevent = pevent; |
| } |
| |
| return pevent ? 0 : -1; |
| } |
| |
| static int trace_event__init2(void) |
| { |
| int be = traceevent_host_bigendian(); |
| struct pevent *pevent; |
| |
| if (trace_event__init(&tevent)) |
| return -1; |
| |
| pevent = tevent.pevent; |
| pevent_set_flag(pevent, PEVENT_NSEC_OUTPUT); |
| pevent_set_file_bigendian(pevent, be); |
| pevent_set_host_bigendian(pevent, be); |
| tevent_initialized = true; |
| return 0; |
| } |
| |
| int trace_event__register_resolver(struct machine *machine, |
| pevent_func_resolver_t *func) |
| { |
| if (!tevent_initialized && trace_event__init2()) |
| return -1; |
| |
| return pevent_set_function_resolver(tevent.pevent, func, machine); |
| } |
| |
| void trace_event__cleanup(struct trace_event *t) |
| { |
| traceevent_unload_plugins(t->plugin_list, t->pevent); |
| pevent_free(t->pevent); |
| } |
| |
| static struct event_format* |
| tp_format(const char *sys, const char *name) |
| { |
| struct pevent *pevent = tevent.pevent; |
| struct event_format *event = NULL; |
| char path[PATH_MAX]; |
| size_t size; |
| char *data; |
| |
| scnprintf(path, PATH_MAX, "%s/%s/%s/format", |
| tracing_events_path, sys, name); |
| |
| if (filename__read_str(path, &data, &size)) |
| return NULL; |
| |
| pevent_parse_format(pevent, &event, data, size, sys); |
| |
| free(data); |
| return event; |
| } |
| |
| struct event_format* |
| trace_event__tp_format(const char *sys, const char *name) |
| { |
| if (!tevent_initialized && trace_event__init2()) |
| return NULL; |
| |
| return tp_format(sys, name); |
| } |