linux/tools/perf/util/trace-event.c
Tzvetomir Stoyanov 55c34ae076 tools tools, tools lib traceevent: Make traceevent APIs more consistent
Rename some traceevent APIs for consistency:

tep_pid_is_registered() to tep_is_pid_registered()
tep_file_bigendian() to tep_is_file_bigendian()

  to make the names and return values consistent with other tep_is_... APIs

tep_data_lat_fmt() to tep_data_latency_format()

  to make the name more descriptive

tep_host_bigendian() to tep_is_bigendian()
tep_set_host_bigendian() to tep_set_local_bigendian()
tep_is_host_bigendian() to tep_is_local_bigendian()

  "host" can be confused with VMs, and "local" is about the local
  machine. All tep_is_..._bigendian(struct tep_handle *tep) APIs return
  the saved data in the tep handle, while tep_is_bigendian() returns
  the running machine's endianness.

All tep_is_... functions are modified to return bool value, instead of int.

Signed-off-by: Tzvetomir Stoyanov <tstoyanov@vmware.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Link: http://lkml.kernel.org/r/20190327141946.4353-2-tstoyanov@vmware.com
Link: http://lkml.kernel.org/r/20190401164344.288624897@goodmis.org
[ Removed some extra parenthesis around return statements ]
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
2019-04-01 15:18:09 -03:00

121 lines
2.5 KiB
C

// SPDX-License-Identifier: GPL-2.0
#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 <linux/err.h>
#include <traceevent/event-parse.h>
#include <api/fs/tracing_path.h>
#include <api/fs/fs.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 tep_handle *pevent = tep_alloc();
if (pevent) {
t->plugin_list = tep_load_plugins(pevent);
t->pevent = pevent;
}
return pevent ? 0 : -1;
}
static int trace_event__init2(void)
{
int be = tep_is_bigendian();
struct tep_handle *pevent;
if (trace_event__init(&tevent))
return -1;
pevent = tevent.pevent;
tep_set_flag(pevent, TEP_NSEC_OUTPUT);
tep_set_file_bigendian(pevent, be);
tep_set_local_bigendian(pevent, be);
tevent_initialized = true;
return 0;
}
int trace_event__register_resolver(struct machine *machine,
tep_func_resolver_t *func)
{
if (!tevent_initialized && trace_event__init2())
return -1;
return tep_set_function_resolver(tevent.pevent, func, machine);
}
void trace_event__cleanup(struct trace_event *t)
{
tep_unload_plugins(t->plugin_list, t->pevent);
tep_free(t->pevent);
}
/*
* Returns pointer with encoded error via <linux/err.h> interface.
*/
static struct tep_event*
tp_format(const char *sys, const char *name)
{
char *tp_dir = get_events_file(sys);
struct tep_handle *pevent = tevent.pevent;
struct tep_event *event = NULL;
char path[PATH_MAX];
size_t size;
char *data;
int err;
if (!tp_dir)
return ERR_PTR(-errno);
scnprintf(path, PATH_MAX, "%s/%s/format", tp_dir, name);
put_events_file(tp_dir);
err = filename__read_str(path, &data, &size);
if (err)
return ERR_PTR(err);
tep_parse_format(pevent, &event, data, size, sys);
free(data);
return event;
}
/*
* Returns pointer with encoded error via <linux/err.h> interface.
*/
struct tep_event*
trace_event__tp_format(const char *sys, const char *name)
{
if (!tevent_initialized && trace_event__init2())
return ERR_PTR(-ENOMEM);
return tp_format(sys, name);
}
struct tep_event *trace_event__tp_format_id(int id)
{
if (!tevent_initialized && trace_event__init2())
return ERR_PTR(-ENOMEM);
return tep_find_event(tevent.pevent, id);
}