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 <linux/err.h>
 11#include <traceevent/event-parse.h>
 12#include <api/fs/tracing_path.h>
 13#include <api/fs/fs.h>
 14#include "trace-event.h"
 15#include "machine.h"
 16#include "util.h"
 17
 18/*
 19 * global trace_event object used by trace_event__tp_format
 20 *
 21 * TODO There's no cleanup call for this. Add some sort of
 22 * __exit function support and call trace_event__cleanup
 23 * there.
 24 */
 25static struct trace_event tevent;
 26static bool tevent_initialized;
 27
 28int trace_event__init(struct trace_event *t)
 29{
 30	struct pevent *pevent = pevent_alloc();
 31
 32	if (pevent) {
 33		t->plugin_list = traceevent_load_plugins(pevent);
 34		t->pevent  = pevent;
 35	}
 36
 37	return pevent ? 0 : -1;
 38}
 39
 40static int trace_event__init2(void)
 41{
 42	int be = traceevent_host_bigendian();
 43	struct pevent *pevent;
 44
 45	if (trace_event__init(&tevent))
 46		return -1;
 47
 48	pevent = tevent.pevent;
 49	pevent_set_flag(pevent, PEVENT_NSEC_OUTPUT);
 50	pevent_set_file_bigendian(pevent, be);
 51	pevent_set_host_bigendian(pevent, be);
 52	tevent_initialized = true;
 53	return 0;
 54}
 55
 56int trace_event__register_resolver(struct machine *machine,
 57				   pevent_func_resolver_t *func)
 58{
 59	if (!tevent_initialized && trace_event__init2())
 60		return -1;
 61
 62	return pevent_set_function_resolver(tevent.pevent, func, machine);
 63}
 64
 65void trace_event__cleanup(struct trace_event *t)
 66{
 67	traceevent_unload_plugins(t->plugin_list, t->pevent);
 68	pevent_free(t->pevent);
 69}
 70
 71/*
 72 * Returns pointer with encoded error via <linux/err.h> interface.
 73 */
 74static struct event_format*
 75tp_format(const char *sys, const char *name)
 76{
 77	struct pevent *pevent = tevent.pevent;
 78	struct event_format *event = NULL;
 79	char path[PATH_MAX];
 80	size_t size;
 81	char *data;
 82	int err;
 83
 84	scnprintf(path, PATH_MAX, "%s/%s/%s/format",
 85		  tracing_events_path, sys, name);
 86
 87	err = filename__read_str(path, &data, &size);
 88	if (err)
 89		return ERR_PTR(err);
 90
 91	pevent_parse_format(pevent, &event, data, size, sys);
 92
 93	free(data);
 94	return event;
 95}
 96
 97/*
 98 * Returns pointer with encoded error via <linux/err.h> interface.
 99 */
100struct event_format*
101trace_event__tp_format(const char *sys, const char *name)
102{
103	if (!tevent_initialized && trace_event__init2())
104		return ERR_PTR(-ENOMEM);
105
106	return tp_format(sys, name);
107}

  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 <linux/err.h>
 11#include <traceevent/event-parse.h>
 12#include <api/fs/tracing_path.h>
 13#include <api/fs/fs.h>
 14#include "trace-event.h"
 15#include "machine.h"
 16#include "util.h"
 17
 18/*
 19 * global trace_event object used by trace_event__tp_format
 20 *
 21 * TODO There's no cleanup call for this. Add some sort of
 22 * __exit function support and call trace_event__cleanup
 23 * there.
 24 */
 25static struct trace_event tevent;
 26static bool tevent_initialized;
 27
 28int trace_event__init(struct trace_event *t)
 29{
 30	struct pevent *pevent = pevent_alloc();
 31
 32	if (pevent) {
 33		t->plugin_list = traceevent_load_plugins(pevent);
 34		t->pevent  = pevent;
 35	}
 36
 37	return pevent ? 0 : -1;
 38}
 39
 40static int trace_event__init2(void)
 41{
 42	int be = traceevent_host_bigendian();
 43	struct pevent *pevent;
 44
 45	if (trace_event__init(&tevent))
 46		return -1;
 47
 48	pevent = tevent.pevent;
 49	pevent_set_flag(pevent, PEVENT_NSEC_OUTPUT);
 50	pevent_set_file_bigendian(pevent, be);
 51	pevent_set_host_bigendian(pevent, be);
 52	tevent_initialized = true;
 53	return 0;
 54}
 55
 56int trace_event__register_resolver(struct machine *machine,
 57				   pevent_func_resolver_t *func)
 58{
 59	if (!tevent_initialized && trace_event__init2())
 60		return -1;
 61
 62	return pevent_set_function_resolver(tevent.pevent, func, machine);
 63}
 64
 65void trace_event__cleanup(struct trace_event *t)
 66{
 67	traceevent_unload_plugins(t->plugin_list, t->pevent);
 68	pevent_free(t->pevent);
 69}
 70
 71/*
 72 * Returns pointer with encoded error via <linux/err.h> interface.
 73 */
 74static struct event_format*
 75tp_format(const char *sys, const char *name)
 76{
 77	struct pevent *pevent = tevent.pevent;
 78	struct event_format *event = NULL;
 79	char path[PATH_MAX];
 80	size_t size;
 81	char *data;
 82	int err;
 83
 84	scnprintf(path, PATH_MAX, "%s/%s/%s/format",
 85		  tracing_events_path, sys, name);
 86
 87	err = filename__read_str(path, &data, &size);
 88	if (err)
 89		return ERR_PTR(err);
 90
 91	pevent_parse_format(pevent, &event, data, size, sys);
 92
 93	free(data);
 94	return event;
 95}
 96
 97/*
 98 * Returns pointer with encoded error via <linux/err.h> interface.
 99 */
100struct event_format*
101trace_event__tp_format(const char *sys, const char *name)
102{
103	if (!tevent_initialized && trace_event__init2())
104		return ERR_PTR(-ENOMEM);
105
106	return tp_format(sys, name);
107}