1 2 #include <stdio.h> 3 #include <unistd.h> 4 #include <stdlib.h> 5 #include <errno.h> 6 #include <sys/types.h> 7 #include <sys/stat.h> 8 #include <fcntl.h> 9 #include <linux/kernel.h> 10 #include <traceevent/event-parse.h> 11 #include "trace-event.h" 12 #include "machine.h" 13 #include "util.h" 14 15 /* 16 * global trace_event object used by trace_event__tp_format 17 * 18 * TODO There's no cleanup call for this. Add some sort of 19 * __exit function support and call trace_event__cleanup 20 * there. 21 */ 22 static struct trace_event tevent; 23 static bool tevent_initialized; 24 25 int trace_event__init(struct trace_event *t) 26 { 27 struct pevent *pevent = pevent_alloc(); 28 29 if (pevent) { 30 t->plugin_list = traceevent_load_plugins(pevent); 31 t->pevent = pevent; 32 } 33 34 return pevent ? 0 : -1; 35 } 36 37 static int trace_event__init2(void) 38 { 39 int be = traceevent_host_bigendian(); 40 struct pevent *pevent; 41 42 if (trace_event__init(&tevent)) 43 return -1; 44 45 pevent = tevent.pevent; 46 pevent_set_flag(pevent, PEVENT_NSEC_OUTPUT); 47 pevent_set_file_bigendian(pevent, be); 48 pevent_set_host_bigendian(pevent, be); 49 tevent_initialized = true; 50 return 0; 51 } 52 53 int trace_event__register_resolver(struct machine *machine) 54 { 55 if (!tevent_initialized && trace_event__init2()) 56 return -1; 57 58 return pevent_set_function_resolver(tevent.pevent, 59 machine__resolve_kernel_addr, 60 machine); 61 } 62 63 void trace_event__cleanup(struct trace_event *t) 64 { 65 traceevent_unload_plugins(t->plugin_list, t->pevent); 66 pevent_free(t->pevent); 67 } 68 69 static struct event_format* 70 tp_format(const char *sys, const char *name) 71 { 72 struct pevent *pevent = tevent.pevent; 73 struct event_format *event = NULL; 74 char path[PATH_MAX]; 75 size_t size; 76 char *data; 77 78 scnprintf(path, PATH_MAX, "%s/%s/%s/format", 79 tracing_events_path, sys, name); 80 81 if (filename__read_str(path, &data, &size)) 82 return NULL; 83 84 pevent_parse_format(pevent, &event, data, size, sys); 85 86 free(data); 87 return event; 88 } 89 90 struct event_format* 91 trace_event__tp_format(const char *sys, const char *name) 92 { 93 if (!tevent_initialized && trace_event__init2()) 94 return NULL; 95 96 return tp_format(sys, name); 97 } 98