* lttng-events.h
*
* Copyright (C) 2009 Steven Rostedt <rostedt@goodmis.org>
- * Copyright (C) 2010-2011 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
+ * Copyright (C) 2009-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
*
- * Dual LGPL v2.1/GPL v2 license.
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; only
+ * version 2.1 of the License.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
-
+#include <linux/uaccess.h>
#include <linux/debugfs.h>
#include "lttng.h"
#include "lttng-types.h"
#include "../wrapper/vmalloc.h" /* for wrapper_vmalloc_sync_all() */
#include "../wrapper/ringbuffer/frontend_types.h"
-#include "../ltt-events.h"
-#include "../ltt-tracer-core.h"
+#include "../lttng-events.h"
+#include "../lttng-tracer-core.h"
/*
* Macro declarations used for all stages.
#undef __field_full
#define __field_full(_type, _item, _order, _base) \
- __event_len += lib_ring_buffer_align(__event_len, ltt_alignof(_type)); \
+ __event_len += lib_ring_buffer_align(__event_len, lttng_alignof(_type)); \
__event_len += sizeof(_type);
#undef __array_enc_ext
#define __array_enc_ext(_type, _item, _length, _order, _base, _encoding) \
- __event_len += lib_ring_buffer_align(__event_len, ltt_alignof(_type)); \
+ __event_len += lib_ring_buffer_align(__event_len, lttng_alignof(_type)); \
__event_len += sizeof(_type) * (_length);
#undef __dynamic_array_enc_ext
#define __dynamic_array_enc_ext(_type, _item, _length, _order, _base, _encoding)\
- __event_len += lib_ring_buffer_align(__event_len, ltt_alignof(u32)); \
+ __event_len += lib_ring_buffer_align(__event_len, lttng_alignof(u32)); \
__event_len += sizeof(u32); \
- __event_len += lib_ring_buffer_align(__event_len, ltt_alignof(_type)); \
+ __event_len += lib_ring_buffer_align(__event_len, lttng_alignof(_type)); \
__dynamic_len[__dynamic_len_idx] = (_length); \
__event_len += sizeof(_type) * __dynamic_len[__dynamic_len_idx]; \
__dynamic_len_idx++;
__event_len += __dynamic_len[__dynamic_len_idx++] = strlen(_src) + 1;
/*
- * strlen_user includes \0. If returns 0, it faulted.
+ * strlen_user includes \0. If returns 0, it faulted, so we set size to
+ * 1 (\0 only).
*/
#undef __string_from_user
#define __string_from_user(_item, _src) \
- __event_len += __dynamic_len[__dynamic_len_idx++] = strlen_user(_src);
+ __event_len += __dynamic_len[__dynamic_len_idx++] = \
+ max_t(size_t, strlen_user(_src), 1);
#undef TP_PROTO
#define TP_PROTO(args...) args
#undef __field_full
#define __field_full(_type, _item, _order, _base) \
- __event_align = max_t(size_t, __event_align, ltt_alignof(_type));
+ __event_align = max_t(size_t, __event_align, lttng_alignof(_type));
#undef __array_enc_ext
#define __array_enc_ext(_type, _item, _length, _order, _base, _encoding) \
- __event_align = max_t(size_t, __event_align, ltt_alignof(_type));
+ __event_align = max_t(size_t, __event_align, lttng_alignof(_type));
#undef __dynamic_array_enc_ext
#define __dynamic_array_enc_ext(_type, _item, _length, _order, _base, _encoding)\
- __event_align = max_t(size_t, __event_align, ltt_alignof(u32)); \
- __event_align = max_t(size_t, __event_align, ltt_alignof(_type));
+ __event_align = max_t(size_t, __event_align, lttng_alignof(u32)); \
+ __event_align = max_t(size_t, __event_align, lttng_alignof(_type));
#undef __string
#define __string(_item, _src)
__assign_##dest: \
{ \
__typeof__(__typemap.dest) __tmp = (src); \
- lib_ring_buffer_align_ctx(&__ctx, ltt_alignof(__tmp)); \
+ lib_ring_buffer_align_ctx(&__ctx, lttng_alignof(__tmp)); \
__chan->ops->event_write(&__ctx, &__tmp, sizeof(__tmp));\
} \
goto __end_field_##dest;
__assign_##dest: \
if (0) \
(void) __typemap.dest; \
- lib_ring_buffer_align_ctx(&__ctx, ltt_alignof(__typemap.dest)); \
+ lib_ring_buffer_align_ctx(&__ctx, lttng_alignof(__typemap.dest)); \
__chan->ops->event_write(&__ctx, src, len); \
goto __end_field_##dest;
__assign_##dest##_1: \
{ \
u32 __tmpl = __dynamic_len[__dynamic_len_idx]; \
- lib_ring_buffer_align_ctx(&__ctx, ltt_alignof(u32)); \
+ lib_ring_buffer_align_ctx(&__ctx, lttng_alignof(u32)); \
__chan->ops->event_write(&__ctx, &__tmpl, sizeof(u32)); \
} \
goto __end_field_##dest##_1; \
__assign_##dest##_2: \
- lib_ring_buffer_align_ctx(&__ctx, ltt_alignof(__typemap.dest)); \
+ lib_ring_buffer_align_ctx(&__ctx, lttng_alignof(__typemap.dest)); \
__chan->ops->event_write(&__ctx, src, \
sizeof(__typemap.dest) * __get_dynamic_array_len(dest));\
goto __end_field_##dest##_2;
__assign_##dest: \
if (0) \
(void) __typemap.dest; \
- lib_ring_buffer_align_ctx(&__ctx, ltt_alignof(__typemap.dest)); \
+ lib_ring_buffer_align_ctx(&__ctx, lttng_alignof(__typemap.dest)); \
__chan->ops->event_write_from_user(&__ctx, src, len); \
goto __end_field_##dest;
/*
- * If string length is zero, this means reading the string faulted, so
- * we simply put a \0. If string length is larger than 0, it is the
- * string length including the final \0.
+ * The string length including the final \0.
*/
#undef tp_copy_string_from_user
#define tp_copy_string_from_user(dest, src) \
\
if (0) \
(void) __typemap.dest; \
- lib_ring_buffer_align_ctx(&__ctx, ltt_alignof(__typemap.dest));\
+ lib_ring_buffer_align_ctx(&__ctx, lttng_alignof(__typemap.dest));\
__ustrlen = __get_dynamic_array_len(dest); \
- if (likely(__ustrlen) > 1) { \
+ if (likely(__ustrlen > 1)) { \
__chan->ops->event_write_from_user(&__ctx, src, \
__ustrlen - 1); \
} \
#undef TP_fast_assign
#define TP_fast_assign(args...) args
+/*
+ * For state dump, check that "session" argument (mandatory) matches the
+ * session this event belongs to. Ensures that we write state dump data only
+ * into the started session, not into all sessions.
+ */
+#ifdef TP_SESSION_CHECK
+#define _TP_SESSION_CHECK(session, csession) (session == csession)
+#else /* TP_SESSION_CHECK */
+#define _TP_SESSION_CHECK(session, csession) 1
+#endif /* TP_SESSION_CHECK */
+
#undef DECLARE_EVENT_CLASS
#define DECLARE_EVENT_CLASS(_name, _proto, _args, _tstruct, _assign, _print) \
static void __event_probe__##_name(void *__data, _proto) \
{ \
- struct ltt_event *__event = __data; \
- struct ltt_channel *__chan = __event->chan; \
+ struct lttng_event *__event = __data; \
+ struct lttng_channel *__chan = __event->chan; \
struct lib_ring_buffer_ctx __ctx; \
size_t __event_len, __event_align; \
size_t __dynamic_len_idx = 0; \
struct __event_typemap__##_name __typemap; \
int __ret; \
\
- if (0) \
+ if (0) { \
(void) __dynamic_len_idx; /* don't warn if unused */ \
+ (void) __typemap; /* don't warn if unused */ \
+ } \
+ if (!_TP_SESSION_CHECK(session, __chan->session)) \
+ return; \
if (unlikely(!ACCESS_ONCE(__chan->session->active))) \
return; \
if (unlikely(!ACCESS_ONCE(__chan->enabled))) \
#define DECLARE_EVENT_CLASS_NOARGS(_name, _tstruct, _assign, _print) \
static void __event_probe__##_name(void *__data) \
{ \
- struct ltt_event *__event = __data; \
- struct ltt_channel *__chan = __event->chan; \
+ struct lttng_event *__event = __data; \
+ struct lttng_channel *__chan = __event->chan; \
struct lib_ring_buffer_ctx __ctx; \
size_t __event_len, __event_align; \
int __ret; \
\
+ if (!_TP_SESSION_CHECK(session, __chan->session)) \
+ return; \
if (unlikely(!ACCESS_ONCE(__chan->session->active))) \
return; \
if (unlikely(!ACCESS_ONCE(__chan->enabled))) \
static int TP_ID(__lttng_events_init__, TRACE_SYSTEM)(void)
{
wrapper_vmalloc_sync_all();
- return ltt_probe_register(&TP_ID(__probe_desc___, TRACE_SYSTEM));
+ return lttng_probe_register(&TP_ID(__probe_desc___, TRACE_SYSTEM));
}
module_init_eval(__lttng_events_init__, TRACE_SYSTEM);
static void TP_ID(__lttng_events_exit__, TRACE_SYSTEM)(void)
{
- ltt_probe_unregister(&TP_ID(__probe_desc___, TRACE_SYSTEM));
+ lttng_probe_unregister(&TP_ID(__probe_desc___, TRACE_SYSTEM));
}
module_exit_eval(__lttng_events_exit__, TRACE_SYSTEM);
projects / lttng-modules.git / blobdiff