-#ifndef _LTTNG_TRACEPOINT_H
-#define _LTTNG_TRACEPOINT_H
-
/*
- * Copyright 2011-2012 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
- *
- * Permission is hereby granted, free of charge, to any person obtaining a copy
- * of this software and associated documentation files (the "Software"), to deal
- * in the Software without restriction, including without limitation the rights
- * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
- * copies of the Software, and to permit persons to whom the Software is
- * furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in
- * all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
- * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
- * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
- * SOFTWARE.
+ * SPDX-License-Identifier: MIT
+ *
+ * Copyright (C) 2011-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
*/
+#ifndef _LTTNG_TRACEPOINT_H
+#define _LTTNG_TRACEPOINT_H
+
#include <stdio.h>
#include <stdlib.h>
#include <lttng/tracepoint-types.h>
#include <urcu/system.h>
#include <dlfcn.h> /* for dlopen */
#include <string.h> /* for memset */
+
#include <lttng/ust-config.h> /* for sdt */
#include <lttng/ust-compiler.h>
+#include <lttng/ust-tracer.h>
+
+#define LTTNG_UST_TRACEPOINT_NAME_LEN_MAX 256
#ifdef LTTNG_UST_HAVE_SDT_INTEGRATION
-#define SDT_USE_VARIADIC
+/*
+ * Instead of using SDT_USE_VARIADIC from 'sys/sdt.h', use our own namespaced
+ * macros since the instrumented application might already have included
+ * 'sys/sdt.h' without variadic support.
+ */
#include <sys/sdt.h>
-#define LTTNG_STAP_PROBEV STAP_PROBEV
+
+#define _LTTNG_UST_SDT_NARG(...) \
+ __LTTNG_UST_SDT_NARG(__VA_ARGS__, 12,11,10,9,8,7,6,5,4,3,2,1,0)
+
+#define __LTTNG_UST_SDT_NARG(_0,_1,_2,_3,_4,_5,_6,_7,_8,_9,_10,_11,_12, N, ...) N
+
+#define _LTTNG_UST_SDT_PROBE_N(provider, name, N, ...) \
+ _SDT_PROBE(provider, name, N, (__VA_ARGS__))
+
+#define LTTNG_UST_STAP_PROBEV(provider, name, ...) \
+ _LTTNG_UST_SDT_PROBE_N(provider, name, _LTTNG_UST_SDT_NARG(0, ##__VA_ARGS__), ##__VA_ARGS__)
+
#else
-#define LTTNG_STAP_PROBEV(...)
+#define LTTNG_UST_STAP_PROBEV(...)
#endif
#ifdef __cplusplus
#define tracepoint(provider, name, ...) \
do { \
- LTTNG_STAP_PROBEV(provider, name, ## __VA_ARGS__); \
+ LTTNG_UST_STAP_PROBEV(provider, name, ## __VA_ARGS__); \
if (tracepoint_enabled(provider, name)) \
do_tracepoint(provider, name, __VA_ARGS__); \
} while (0)
#define _TP_ARGS_DATA_VAR(...) _TP_DATA_VAR_N(_TP_NARGS(0, ##__VA_ARGS__), ##__VA_ARGS__)
#define _TP_PARAMS(...) __VA_ARGS__
+/*
+ * sizeof(#_provider) - 1 : length of the provider string (excluding \0).
+ * sizeof(#_name) - 1 : length of the name string (excluding \0).
+ * + 1 : separator between provider and event name.
+ *
+ * Upper bound (inclusive) is LTTNG_UST_TRACEPOINT_NAME_LEN_MAX - 1 to
+ * account for \0.
+ *
+ * The comparison is:
+ * left hand side: sizeof(#_provider) - 1 + sizeof(#_name) - 1 + 1
+ * right hand side: LTTNG_UST_TRACEPOINT_NAME_LEN_MAX - 1
+ * operator: <= (inclusive)
+ * Simplified in the code below.
+ */
+#define lttng_ust_tracepoint_validate_name_len(_provider, _name) \
+ lttng_ust_static_assert(sizeof(#_provider) + sizeof(#_name) <= LTTNG_UST_TRACEPOINT_NAME_LEN_MAX, \
+ "Tracepoint name length is too long", \
+ Tracepoint_name_length_is_too_long)
+
/*
* The tracepoint cb is marked always inline so we can distinguish
* between caller's ip addresses within the probe using the return
*/
#define _DECLARE_TRACEPOINT(_provider, _name, ...) \
extern struct lttng_ust_tracepoint __tracepoint_##_provider##___##_name; \
-static inline __attribute__((always_inline, unused)) lttng_ust_notrace \
-void __tracepoint_cb_##_provider##___##_name(_TP_ARGS_PROTO(__VA_ARGS__)); \
+static inline \
+void __tracepoint_cb_##_provider##___##_name(_TP_ARGS_PROTO(__VA_ARGS__)) \
+ __attribute__((always_inline, unused)) lttng_ust_notrace; \
static \
void __tracepoint_cb_##_provider##___##_name(_TP_ARGS_PROTO(__VA_ARGS__)) \
{ \
- struct lttng_ust_tracepoint_probe *__tp_probe; \
+ struct lttng_ust_tracepoint_probe *__tp_probe; \
\
if (caa_unlikely(!TP_RCU_LINK_TEST())) \
return; \
- tp_rcu_read_lock_bp(); \
- __tp_probe = tp_rcu_dereference_bp(__tracepoint_##_provider##___##_name.probes); \
+ tp_rcu_read_lock(); \
+ __tp_probe = tp_rcu_dereference(__tracepoint_##_provider##___##_name.probes); \
if (caa_unlikely(!__tp_probe)) \
goto end; \
do { \
(_TP_ARGS_DATA_VAR(__VA_ARGS__)); \
} while ((++__tp_probe)->func); \
end: \
- tp_rcu_read_unlock_bp(); \
+ tp_rcu_read_unlock(); \
} \
-static inline lttng_ust_notrace \
-void __tracepoint_register_##_provider##___##_name(char *name, \
- void (*func)(void), void *data); \
static inline \
-void __tracepoint_register_##_provider##___##_name(char *name, \
+void __tracepoint_register_##_provider##___##_name(char *provider_name, char *event_name, \
+ void (*func)(void), void *data) \
+ lttng_ust_notrace; \
+static inline \
+void __tracepoint_register_##_provider##___##_name(char *provider_name, char *event_name, \
void (*func)(void), void *data) \
{ \
- __tracepoint_probe_register(name, func, data, \
+ __tracepoint_probe_register(provider_name, event_name, func, data, \
__tracepoint_##_provider##___##_name.signature); \
} \
-static inline lttng_ust_notrace \
-void __tracepoint_unregister_##_provider##___##_name(char *name, \
- void (*func)(void), void *data); \
static inline \
-void __tracepoint_unregister_##_provider##___##_name(char *name, \
+void __tracepoint_unregister_##_provider##___##_name(char *provider_name, char *event_name, \
+ void (*func)(void), void *data) \
+ lttng_ust_notrace; \
+static inline \
+void __tracepoint_unregister_##_provider##___##_name(char *provider_name, char *event_name, \
void (*func)(void), void *data) \
{ \
- __tracepoint_probe_unregister(name, func, data); \
+ __tracepoint_probe_unregister(provider_name, event_name, func, data); \
}
-extern int __tracepoint_probe_register(const char *name, void (*func)(void),
- void *data, const char *signature);
-extern int __tracepoint_probe_unregister(const char *name, void (*func)(void),
- void *data);
+extern int __tracepoint_probe_register(const char *provider_name, const char *event_name,
+ void (*func)(void), void *data, const char *signature);
+extern int __tracepoint_probe_unregister(const char *provider_name, const char *event_name,
+ void (*func)(void), void *data);
/*
* tracepoint dynamic linkage handling (callbacks). Hidden visibility:
* shared across objects in a module/main executable.
+ *
+ * IMPORTANT: this structure is part of the ABI between instrumented
+ * applications and UST. Fields need to be only added at the end, never
+ * reordered, never removed.
+ *
+ * The field @struct_size should be used to determine the size of the
+ * structure. It should be queried before using additional fields added
+ * at the end of the structure.
*/
struct lttng_ust_tracepoint_dlopen {
+ uint32_t struct_size;
+
void *liblttngust_handle;
int (*tracepoint_register_lib)(struct lttng_ust_tracepoint * const *tracepoints_start,
int tracepoints_count);
int (*tracepoint_unregister_lib)(struct lttng_ust_tracepoint * const *tracepoints_start);
-#ifndef _LGPL_SOURCE
- void (*rcu_read_lock_sym_bp)(void);
- void (*rcu_read_unlock_sym_bp)(void);
- void *(*rcu_dereference_sym_bp)(void *p);
-#endif
+ void (*rcu_read_lock_sym)(void);
+ void (*rcu_read_unlock_sym)(void);
+ void *(*rcu_dereference_sym)(void *p);
+
+ /* End of base ABI. Fields below should be used after checking struct_size. */
};
extern struct lttng_ust_tracepoint_dlopen tracepoint_dlopen;
-
-#if defined(TRACEPOINT_DEFINE) || defined(TRACEPOINT_CREATE_PROBES)
+extern struct lttng_ust_tracepoint_dlopen *tracepoint_dlopen_ptr;
/*
* These weak symbols, the constructor, and destructor take care of
int __tracepoint_ptrs_registered
__attribute__((weak, visibility("hidden")));
struct lttng_ust_tracepoint_dlopen tracepoint_dlopen
+ __attribute__((weak, visibility("hidden"))) = {
+ .struct_size = sizeof(struct lttng_ust_tracepoint_dlopen),
+};
+/*
+ * Deal with gcc O1 optimisation issues with weak hidden symbols. gcc
+ * 4.8 and prior does not have the same behavior for symbol scoping on
+ * 32-bit powerpc depending on the object size: symbols for objects of 8
+ * bytes or less have the same address throughout a module, whereas they
+ * have different addresses between compile units for objects larger
+ * than 8 bytes. Add this pointer indirection to ensure that the symbol
+ * scoping match that of the other weak hidden symbols found in this
+ * header.
+ */
+struct lttng_ust_tracepoint_dlopen *tracepoint_dlopen_ptr
__attribute__((weak, visibility("hidden")));
+/*
+ * Tracepoint dynamic linkage handling (callbacks). Hidden visibility: shared
+ * across objects in a module/main executable. The callbacks are used to
+ * control and check if the destructors should be executed.
+ *
+ * IMPORTANT: this structure is part of the ABI between instrumented
+ * applications and UST. Fields need to be only added at the end, never
+ * reordered, never removed.
+ *
+ * The field @struct_size should be used to determine the size of the
+ * structure. It should be queried before using additional fields added
+ * at the end of the structure.
+ */
+struct lttng_ust_tracepoint_destructors_syms {
+ uint32_t struct_size;
+
+ void (*tracepoint_disable_destructors)(void);
+ int (*tracepoint_get_destructors_state)(void);
+
+ /* End of base ABI. Fields below should be used after checking struct_size. */
+};
+
+extern struct lttng_ust_tracepoint_destructors_syms tracepoint_destructors_syms;
+extern struct lttng_ust_tracepoint_destructors_syms *tracepoint_destructors_syms_ptr;
+
+struct lttng_ust_tracepoint_destructors_syms tracepoint_destructors_syms
+ __attribute__((weak, visibility("hidden"))) = {
+ .struct_size = sizeof(struct lttng_ust_tracepoint_destructors_syms),
+};
+struct lttng_ust_tracepoint_destructors_syms *tracepoint_destructors_syms_ptr
+ __attribute__((weak, visibility("hidden")));
+
+static inline void tracepoint_disable_destructors(void)
+{
+ if (!tracepoint_dlopen_ptr)
+ tracepoint_dlopen_ptr = &tracepoint_dlopen;
+ if (!tracepoint_destructors_syms_ptr)
+ tracepoint_destructors_syms_ptr = &tracepoint_destructors_syms;
+ if (tracepoint_dlopen_ptr->liblttngust_handle
+ && tracepoint_destructors_syms_ptr->tracepoint_disable_destructors)
+ tracepoint_destructors_syms_ptr->tracepoint_disable_destructors();
+}
+
#ifndef _LGPL_SOURCE
-static inline void lttng_ust_notrace
-__tracepoint__init_urcu_sym(void);
+static inline void
+__tracepoint__init_urcu_sym(void)
+ lttng_ust_notrace;
static inline void
__tracepoint__init_urcu_sym(void)
{
+ if (!tracepoint_dlopen_ptr)
+ tracepoint_dlopen_ptr = &tracepoint_dlopen;
/*
* Symbols below are needed by tracepoint call sites and probe
* providers.
*/
- if (!tracepoint_dlopen.rcu_read_lock_sym_bp)
- tracepoint_dlopen.rcu_read_lock_sym_bp =
+ if (!tracepoint_dlopen_ptr->rcu_read_lock_sym)
+ tracepoint_dlopen_ptr->rcu_read_lock_sym =
URCU_FORCE_CAST(void (*)(void),
- dlsym(tracepoint_dlopen.liblttngust_handle,
- "tp_rcu_read_lock_bp"));
- if (!tracepoint_dlopen.rcu_read_unlock_sym_bp)
- tracepoint_dlopen.rcu_read_unlock_sym_bp =
+ dlsym(tracepoint_dlopen_ptr->liblttngust_handle,
+ "tp_rcu_read_lock"));
+ if (!tracepoint_dlopen_ptr->rcu_read_unlock_sym)
+ tracepoint_dlopen_ptr->rcu_read_unlock_sym =
URCU_FORCE_CAST(void (*)(void),
- dlsym(tracepoint_dlopen.liblttngust_handle,
- "tp_rcu_read_unlock_bp"));
- if (!tracepoint_dlopen.rcu_dereference_sym_bp)
- tracepoint_dlopen.rcu_dereference_sym_bp =
+ dlsym(tracepoint_dlopen_ptr->liblttngust_handle,
+ "tp_rcu_read_unlock"));
+ if (!tracepoint_dlopen_ptr->rcu_dereference_sym)
+ tracepoint_dlopen_ptr->rcu_dereference_sym =
URCU_FORCE_CAST(void *(*)(void *p),
- dlsym(tracepoint_dlopen.liblttngust_handle,
- "tp_rcu_dereference_sym_bp"));
+ dlsym(tracepoint_dlopen_ptr->liblttngust_handle,
+ "tp_rcu_dereference_sym"));
}
#else
-static inline void lttng_ust_notrace
-__tracepoint__init_urcu_sym(void);
+static inline void
+__tracepoint__init_urcu_sym(void)
+ lttng_ust_notrace;
static inline void
__tracepoint__init_urcu_sym(void)
{
}
#endif
-static void lttng_ust_notrace __attribute__((constructor))
-__tracepoints__init(void);
+static void
+__tracepoints__init(void)
+ lttng_ust_notrace __attribute__((constructor));
static void
__tracepoints__init(void)
{
- if (__tracepoint_registered++)
+ if (__tracepoint_registered++) {
+ if (!tracepoint_dlopen_ptr->liblttngust_handle)
+ return;
+ __tracepoint__init_urcu_sym();
return;
+ }
- if (!tracepoint_dlopen.liblttngust_handle)
- tracepoint_dlopen.liblttngust_handle =
- dlopen("liblttng-ust-tracepoint.so.0", RTLD_NOW | RTLD_GLOBAL);
- if (!tracepoint_dlopen.liblttngust_handle)
+ if (!tracepoint_dlopen_ptr)
+ tracepoint_dlopen_ptr = &tracepoint_dlopen;
+ if (!tracepoint_dlopen_ptr->liblttngust_handle)
+ tracepoint_dlopen_ptr->liblttngust_handle =
+ dlopen(LTTNG_UST_TRACEPOINT_LIB_SONAME, RTLD_NOW | RTLD_GLOBAL);
+ if (!tracepoint_dlopen_ptr->liblttngust_handle)
return;
__tracepoint__init_urcu_sym();
}
-static void lttng_ust_notrace __attribute__((destructor))
-__tracepoints__destroy(void);
+static void
+__tracepoints__destroy(void)
+ lttng_ust_notrace __attribute__((destructor));
static void
__tracepoints__destroy(void)
{
if (--__tracepoint_registered)
return;
- if (tracepoint_dlopen.liblttngust_handle && !__tracepoint_ptrs_registered) {
- ret = dlclose(tracepoint_dlopen.liblttngust_handle);
- if (ret) {
- fprintf(stderr, "Error (%d) in dlclose\n", ret);
- abort();
- }
- memset(&tracepoint_dlopen, 0, sizeof(tracepoint_dlopen));
+ if (!tracepoint_dlopen_ptr)
+ tracepoint_dlopen_ptr = &tracepoint_dlopen;
+ if (!tracepoint_destructors_syms_ptr)
+ tracepoint_destructors_syms_ptr = &tracepoint_destructors_syms;
+ if (!tracepoint_dlopen_ptr->liblttngust_handle)
+ return;
+ if (__tracepoint_ptrs_registered)
+ return;
+ /*
+ * Lookup if destructors must be executed using the new method.
+ */
+ if (tracepoint_destructors_syms_ptr->tracepoint_get_destructors_state
+ && !tracepoint_destructors_syms_ptr->tracepoint_get_destructors_state()) {
+ /*
+ * The tracepoint_get_destructors_state symbol was found with
+ * dlsym but its returned value is 0 meaning that destructors
+ * must not be executed.
+ */
+ return;
}
+ ret = dlclose(tracepoint_dlopen_ptr->liblttngust_handle);
+ if (ret) {
+ fprintf(stderr, "Error (%d) in dlclose\n", ret);
+ abort();
+ }
+ memset(tracepoint_dlopen_ptr, 0, sizeof(*tracepoint_dlopen_ptr));
}
-#endif
-
#ifdef TRACEPOINT_DEFINE
/*
#define _TP_EXTRACT_STRING(...) #__VA_ARGS__
#define _DEFINE_TRACEPOINT(_provider, _name, _args) \
+ lttng_ust_tracepoint_validate_name_len(_provider, _name); \
extern int __tracepoint_provider_##_provider; \
- static const char __tp_strtab_##_provider##___##_name[] \
+ static const char __tp_provider_strtab_##_provider##___##_name[] \
__attribute__((section("__tracepoints_strings"))) = \
- #_provider ":" #_name; \
+ #_provider; \
+ static const char __tp_name_strtab_##_provider##___##_name[] \
+ __attribute__((section("__tracepoints_strings"))) = \
+ #_name; \
struct lttng_ust_tracepoint __tracepoint_##_provider##___##_name \
- __attribute__((section("__tracepoints"))) = \
- { \
- __tp_strtab_##_provider##___##_name, \
+ __attribute__((section("__tracepoints"))) = { \
+ sizeof(struct lttng_ust_tracepoint), \
+ __tp_provider_strtab_##_provider##___##_name, \
+ __tp_name_strtab_##_provider##___##_name, \
0, \
NULL, \
_TRACEPOINT_UNDEFINED_REF(_provider), \
_TP_EXTRACT_STRING(_args), \
- { }, \
}; \
static struct lttng_ust_tracepoint * \
__tracepoint_ptr_##_provider##___##_name \
- __attribute__((used, section("__tracepoints_ptrs"))) = \
+ __attribute__((section("__tracepoints_ptrs"), used)) \
+ __lttng_ust_variable_attribute_no_sanitize_address = \
&__tracepoint_##_provider##___##_name;
-static void lttng_ust_notrace __attribute__((constructor))
-__tracepoints__ptrs_init(void);
+static void
+__tracepoints__ptrs_init(void)
+ lttng_ust_notrace __attribute__((constructor));
static void
__tracepoints__ptrs_init(void)
{
if (__tracepoint_ptrs_registered++)
return;
- if (!tracepoint_dlopen.liblttngust_handle)
- tracepoint_dlopen.liblttngust_handle =
- dlopen("liblttng-ust-tracepoint.so.0", RTLD_NOW | RTLD_GLOBAL);
- if (!tracepoint_dlopen.liblttngust_handle)
+ if (!tracepoint_dlopen_ptr)
+ tracepoint_dlopen_ptr = &tracepoint_dlopen;
+ if (!tracepoint_dlopen_ptr->liblttngust_handle)
+ tracepoint_dlopen_ptr->liblttngust_handle =
+ dlopen(LTTNG_UST_TRACEPOINT_LIB_SONAME, RTLD_NOW | RTLD_GLOBAL);
+ if (!tracepoint_dlopen_ptr->liblttngust_handle)
return;
- tracepoint_dlopen.tracepoint_register_lib =
+ if (!tracepoint_destructors_syms_ptr)
+ tracepoint_destructors_syms_ptr = &tracepoint_destructors_syms;
+ tracepoint_dlopen_ptr->tracepoint_register_lib =
URCU_FORCE_CAST(int (*)(struct lttng_ust_tracepoint * const *, int),
- dlsym(tracepoint_dlopen.liblttngust_handle,
+ dlsym(tracepoint_dlopen_ptr->liblttngust_handle,
"tracepoint_register_lib"));
- tracepoint_dlopen.tracepoint_unregister_lib =
+ tracepoint_dlopen_ptr->tracepoint_unregister_lib =
URCU_FORCE_CAST(int (*)(struct lttng_ust_tracepoint * const *),
- dlsym(tracepoint_dlopen.liblttngust_handle,
+ dlsym(tracepoint_dlopen_ptr->liblttngust_handle,
"tracepoint_unregister_lib"));
+ tracepoint_destructors_syms_ptr->tracepoint_disable_destructors =
+ URCU_FORCE_CAST(void (*)(void),
+ dlsym(tracepoint_dlopen_ptr->liblttngust_handle,
+ "tp_disable_destructors"));
+ tracepoint_destructors_syms_ptr->tracepoint_get_destructors_state =
+ URCU_FORCE_CAST(int (*)(void),
+ dlsym(tracepoint_dlopen_ptr->liblttngust_handle,
+ "tp_get_destructors_state"));
__tracepoint__init_urcu_sym();
- if (tracepoint_dlopen.tracepoint_register_lib) {
- tracepoint_dlopen.tracepoint_register_lib(__start___tracepoints_ptrs,
+ if (tracepoint_dlopen_ptr->tracepoint_register_lib) {
+ tracepoint_dlopen_ptr->tracepoint_register_lib(__start___tracepoints_ptrs,
__stop___tracepoints_ptrs -
__start___tracepoints_ptrs);
}
}
-static void lttng_ust_notrace __attribute__((destructor))
-__tracepoints__ptrs_destroy(void);
+static void
+__tracepoints__ptrs_destroy(void)
+ lttng_ust_notrace __attribute__((destructor));
static void
__tracepoints__ptrs_destroy(void)
{
if (--__tracepoint_ptrs_registered)
return;
- if (tracepoint_dlopen.tracepoint_unregister_lib)
- tracepoint_dlopen.tracepoint_unregister_lib(__start___tracepoints_ptrs);
- if (tracepoint_dlopen.liblttngust_handle && !__tracepoint_registered) {
- ret = dlclose(tracepoint_dlopen.liblttngust_handle);
+ if (!tracepoint_dlopen_ptr)
+ tracepoint_dlopen_ptr = &tracepoint_dlopen;
+ if (!tracepoint_destructors_syms_ptr)
+ tracepoint_destructors_syms_ptr = &tracepoint_destructors_syms;
+ if (tracepoint_dlopen_ptr->tracepoint_unregister_lib)
+ tracepoint_dlopen_ptr->tracepoint_unregister_lib(__start___tracepoints_ptrs);
+ if (tracepoint_dlopen_ptr->liblttngust_handle
+ && tracepoint_destructors_syms_ptr->tracepoint_get_destructors_state
+ && tracepoint_destructors_syms_ptr->tracepoint_get_destructors_state()
+ && !__tracepoint_ptrs_registered) {
+ ret = dlclose(tracepoint_dlopen_ptr->liblttngust_handle);
if (ret) {
fprintf(stderr, "Error (%d) in dlclose\n", ret);
abort();
}
- memset(&tracepoint_dlopen, 0, sizeof(tracepoint_dlopen));
+ memset(tracepoint_dlopen_ptr, 0, sizeof(*tracepoint_dlopen_ptr));
}
}
* How to use the TRACEPOINT_EVENT macro:
*
* An example:
- *
+ *
* TRACEPOINT_EVENT(someproject_component, event_name,
*
* * TP_ARGS takes from 0 to 10 "type, field_name" pairs *
* * TP_FIELDS describes the event payload layout in the trace *
*
* TP_FIELDS(
- * * Integer, printed in base 10 *
+ * * Integer, printed in base 10 *
* ctf_integer(int, field_a, arg0)
*
- * * Integer, printed with 0x base 16 *
+ * * Integer, printed with 0x base 16 *
* ctf_integer_hex(unsigned long, field_d, arg1)
*
* * Enumeration *
* ctf_enum(someproject_component, enum_name, int, field_e, arg0)
*
- * * Array Sequence, printed as UTF8-encoded array of bytes *
+ * * Array Sequence, printed as UTF8-encoded array of bytes *
* ctf_array_text(char, field_b, string, FIXED_LEN)
* ctf_sequence_text(char, field_c, string, size_t, strlen)
*
- * * String, printed as UTF8-encoded string *
+ * * String, printed as UTF8-encoded string *
* ctf_string(field_e, string)
*
- * * Array sequence of signed integer values *
+ * * Array sequence of signed integer values *
* ctf_array(long, field_f, arg4, FIXED_LEN4)
* ctf_sequence(long, field_g, arg4, size_t, arg4_len)
* )
projects / lttng-ust.git / blobdiff