the configure script, to generate it.
+USAGE:
+
+ - Create an instrumentation header following the tracepoint examples.
+ (see tracepoint.h and tests/hello/tp.h).
+ - Link application with -lust.
+ - (TODO: start tracing with the "lttng" command from lttng-tools)
+
+ Note: libust debug can be activated by either of the following means:
+ - Setting the environment variable "UST_DEBUG" when launching the
+ application.
+ - Compiling libust with -DUST_DEBUG.
+
+
TRACE VIEWER:
LTTV is used for viewing UST traces. LTTV may be obtained at
-/* Copyright (C) 2009 Pierre-Marc Fournier
+#ifndef _USTERR_H
+#define _USTERR_H
+
+/*
+ * Copyright (C) 2009 Pierre-Marc Fournier
+ * Copyright (C) 2011 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
*
* 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; either
- * version 2.1 of the License, or (at your option) any later version.
+ * License as published by the Free Software Foundation; 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
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
-#ifndef _USTERR_H
-#define _USTERR_H
-
#include <string.h>
#include <sys/types.h>
#include <sys/syscall.h>
#include "share.h"
+enum ust_loglevel {
+ UST_LOGLEVEL_UNKNOWN = 0,
+ UST_LOGLEVEL_NORMAL,
+ UST_LOGLEVEL_DEBUG,
+};
+
+extern volatile enum ust_loglevel ust_loglevel;
+void init_usterr(void);
+
+static inline int ust_debug(void)
+{
+ return ust_loglevel == UST_LOGLEVEL_DEBUG;
+}
+
#ifndef UST_COMPONENT
#define UST_COMPONENT libust
#endif
#define XSTR(d) STR(d)
#define STR(s) #s
-/* A dummy function to force format checking */
-static inline void __attribute__ ((format (printf, 1, 2)))
- __check_ust_safe_fmt(const char *fmt, ...)
-{
-}
-
#define UST_STR_COMPONENT XSTR(UST_COMPONENT)
-#define ERRMSG(fmt, args...) do { fprintf(stderr, UST_STR_COMPONENT "[%ld/%ld]: " fmt " (in %s() at " __FILE__ ":" XSTR(__LINE__) ")\n", (long) getpid(), (long) syscall(SYS_gettid), ## args, __func__); } while(0)
+#define ERRMSG(fmt, args...) \
+ do { \
+ fprintf(stderr, UST_STR_COMPONENT "[%ld/%ld]: " fmt " (in %s() at " __FILE__ ":" XSTR(__LINE__) ")\n", \
+ (long) getpid(), \
+ (long) syscall(SYS_gettid), \
+ ## args, \
+ __func__); \
+ } while(0)
#ifdef UST_DEBUG
-# define DBG(fmt, args...) ERRMSG(fmt, ## args)
-# define DBG_raw(fmt, args...) do { fprintf(stderr, fmt, ## args); } while(0)
+# define DBG(fmt, args...) ERRMSG(fmt, ## args)
+# define DBG_raw(fmt, args...) \
+ do { \
+ fprintf(stderr, fmt, ## args); \
+ } while(0)
#else
-# define DBG(fmt, args...) __check_ust_safe_fmt(fmt, ## args)
-# define DBG_raw(fmt, args...) __check_ust_safe_fmt(fmt, ## args)
+# define DBG(fmt, args...) \
+ do { \
+ if (ust_debug()) \
+ ERRMSG(fmt, ## args); \
+ } while (0)
+# define DBG_raw(fmt, args...) \
+ do { \
+ if (ust_debug()) { \
+ fprintf(stderr, fmt, ## args); \
+ } \
+ } while(0)
#endif
+
#define WARN(fmt, args...) ERRMSG("Warning: " fmt, ## args)
#define ERR(fmt, args...) ERRMSG("Error: " fmt, ## args)
#define BUG(fmt, args...) ERRMSG("BUG: " fmt, ## args)
} while(0);
#endif
-#define BUG_ON(condition) do { if (unlikely(condition)) ERR("condition not respected (BUG)"); } while(0)
-#define WARN_ON(condition) do { if (unlikely(condition)) WARN("condition not respected on line %s:%d", __FILE__, __LINE__); } while(0)
+#define BUG_ON(condition) \
+ do { \
+ if (unlikely(condition)) \
+ ERR("condition not respected (BUG) on line %s:%d", __FILE__, __LINE__); \
+ } while(0)
+#define WARN_ON(condition) \
+ do { \
+ if (unlikely(condition)) \
+ WARN("condition not respected on line %s:%d", __FILE__, __LINE__); \
+ } while(0)
#define WARN_ON_ONCE(condition) WARN_ON(condition)
#endif /* _USTERR_H */
-/* Copyright (C) 2009 Pierre-Marc Fournier
+#ifndef _USTERR_SIGNAL_SAFE_H
+#define _USTERR_SIGNAL_SAFE_H
+
+/*
+ * Copyright (C) 2009 Pierre-Marc Fournier
+ * Copyright (C) 2011 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
*
* 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; either
- * version 2.1 of the License, or (at your option) any later version.
+ * License as published by the Free Software Foundation; 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
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
-#ifndef _USTERR_SIGNAL_SAFE_H
-#define _USTERR_SIGNAL_SAFE_H
-
#include <string.h>
#include <sys/types.h>
#include <sys/syscall.h>
#include "share.h"
+enum ust_loglevel {
+ UST_LOGLEVEL_UNKNOWN = 0,
+ UST_LOGLEVEL_NORMAL,
+ UST_LOGLEVEL_DEBUG,
+};
+
+extern volatile enum ust_loglevel ust_loglevel;
+void init_usterr(void);
+
+static inline int ust_debug(void)
+{
+ return ust_loglevel == UST_LOGLEVEL_DEBUG;
+}
+
#ifndef UST_COMPONENT
//#error UST_COMPONENT is undefined
#define UST_COMPONENT libust
{
}
-#define sigsafe_print_err(fmt, args...) \
-{ \
+#define sigsafe_print_err(fmt, args...) \
+{ \
/* Can't use dynamic allocation. Limit ourselves to 250 chars. */ \
- char ____buf[250]; \
- int ____saved_errno; \
-\
- /* Save the errno. */ \
- ____saved_errno = errno; \
-\
- ust_safe_snprintf(____buf, sizeof(____buf), fmt, ## args); \
-\
- /* Add end of string in case of buffer overflow. */ \
- ____buf[sizeof(____buf) - 1] = 0; \
-\
- patient_write(STDERR_FILENO, ____buf, strlen(____buf)); \
- /* Can't print errors because we are in the error printing code path. */ \
-\
- /* Restore errno, in order to be async-signal safe. */ \
- errno = ____saved_errno; \
+ char ____buf[250]; \
+ int ____saved_errno; \
+ \
+ /* Save the errno. */ \
+ ____saved_errno = errno; \
+ \
+ ust_safe_snprintf(____buf, sizeof(____buf), fmt, ## args); \
+ \
+ /* Add end of string in case of buffer overflow. */ \
+ ____buf[sizeof(____buf) - 1] = 0; \
+ \
+ patient_write(STDERR_FILENO, ____buf, strlen(____buf)); \
+ /* \
+ * Can't print errors because we are in the error printing code \
+ * path. \
+ */ \
+ \
+ /* Restore errno, in order to be async-signal safe. */ \
+ errno = ____saved_errno; \
}
#define UST_STR_COMPONENT XSTR(UST_COMPONENT)
-#define ERRMSG(fmt, args...) do { sigsafe_print_err(UST_STR_COMPONENT "[%ld/%ld]: " fmt " (in %s() at " __FILE__ ":" XSTR(__LINE__) ")\n", (long) getpid(), (long) syscall(SYS_gettid), ## args, __func__); fflush(stderr); } while(0)
+#define ERRMSG(fmt, args...) \
+ do { \
+ sigsafe_print_err(UST_STR_COMPONENT "[%ld/%ld]: " fmt " (in %s() at " __FILE__ ":" XSTR(__LINE__) ")\n", \
+ (long) getpid(), \
+ (long) syscall(SYS_gettid), \
+ ## args, __func__); \
+ fflush(stderr); \
+ } while(0)
#ifdef UST_DEBUG
-# define DBG(fmt, args...) ERRMSG(fmt, ## args)
-# define DBG_raw(fmt, args...) do { sigsafe_print_err(fmt, ## args); fflush(stderr); } while(0)
+# define DBG(fmt, args...) ERRMSG(fmt, ## args)
+# define DBG_raw(fmt, args...) \
+ do { \
+ sigsafe_print_err(fmt, ## args); \
+ fflush(stderr); \
+ } while(0)
#else
-# define DBG(fmt, args...) __check_ust_safe_fmt(fmt, ## args)
-# define DBG_raw(fmt, args...) __check_ust_safe_fmt(fmt, ## args)
+# define DBG(fmt, args...) \
+ do { \
+ if (ust_debug()) \
+ ERRMSG(fmt, ## args); \
+ } while (0)
+# define DBG_raw(fmt, args...) \
+ do { \
+ if (ust_debug()) { \
+ sigsafe_print_err(fmt, ## args); \
+ fflush(stderr); \
+ } \
+ } while(0)
#endif
#define WARN(fmt, args...) ERRMSG("Warning: " fmt, ## args)
#define ERR(fmt, args...) ERRMSG("Error: " fmt, ## args)
} while(0);
#endif
-#define BUG_ON(condition) do { if (unlikely(condition)) ERR("condition not respected (BUG)"); } while(0)
-#define WARN_ON(condition) do { if (unlikely(condition)) WARN("condition not respected on line %s:%d", __FILE__, __LINE__); } while(0)
+#define BUG_ON(condition) \
+ do { \
+ if (unlikely(condition)) \
+ ERR("condition not respected (BUG) on line %s:%d", __FILE__, __LINE__); \
+ } while(0)
+#define WARN_ON(condition) \
+ do { \
+ if (unlikely(condition)) \
+ WARN("condition not respected on line %s:%d", __FILE__, __LINE__); \
+ } while(0)
#define WARN_ON_ONCE(condition) WARN_ON(condition)
+
#endif /* _USTERR_SIGNAL_SAFE_H */
ltt-context.c \
ltt-probes.c \
lttng-ust-abi.c \
- lttng-ust-comm.c
+ lttng-ust-comm.c \
+ ust-core.c
#removed: buffers.c buffers.h
void __attribute__((constructor)) init_ustrelay_transport(void)
{
+ init_usterr();
if(!initialized) {
ltt_transport_register(&ust_relay_transport);
initialized = 1;
void __attribute__((constructor)) lttng_ust_abi_init(void)
{
+ init_usterr();
/* TODO: initialize socket */
}
void __attribute__((constructor)) init_tracepoint(void)
{
+ init_usterr();
if (!initialized) {
tracepoint_register_lib(__start___tracepoints_ptrs,
__stop___tracepoints_ptrs
--- /dev/null
+/*
+ * ust-core.c
+ *
+ * Copyright (C) 2011 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
+ *
+ * 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 <usterr_signal_safe.h>
+#include <stdlib.h>
+
+volatile enum ust_loglevel ust_loglevel;
+
+void init_usterr(void)
+{
+ char *ust_debug;
+
+ if (ust_loglevel == UST_LOGLEVEL_UNKNOWN) {
+ ust_debug = getenv("UST_DEBUG");
+ if (ust_debug)
+ ust_loglevel = UST_LOGLEVEL_DEBUG;
+ else
+ ust_loglevel = UST_LOGLEVEL_NORMAL;
+ }
+}
projects / lttng-ust.git / commitdiff
