* Copyright (C) 2011 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
*/
-#ifndef _USTERR_SIGNAL_SAFE_H
-#define _USTERR_SIGNAL_SAFE_H
+#ifndef _UST_COMMON_LOGGING_H
+#define _UST_COMMON_LOGGING_H
#include <string.h>
#include <sys/types.h>
#include <stdarg.h>
#include <stdbool.h>
#include <stdio.h>
+
+#include <lttng/ust-utils.h>
+#include <urcu/compiler.h>
+#include <urcu/system.h>
+
#include "common/patient.h"
#include "common/compat/tid.h"
#include "common/safe-snprintf.h"
-enum ust_err_loglevel {
- UST_ERR_LOGLEVEL_UNKNOWN = 0,
- UST_ERR_LOGLEVEL_NORMAL,
- UST_ERR_LOGLEVEL_DEBUG,
+enum lttng_ust_log_level {
+ LTTNG_UST_LOG_LEVEL_UNKNOWN = 0,
+ LTTNG_UST_LOG_LEVEL_SILENT,
+ LTTNG_UST_LOG_LEVEL_DEBUG,
+};
+
+enum lttng_ust_log_critical_action {
+ LTTNG_UST_LOG_CRITICAL_ACTION_UNKNOWN = 0,
+ LTTNG_UST_LOG_CRITICAL_ACTION_NONE,
+ LTTNG_UST_LOG_CRITICAL_ACTION_ABORT,
};
-extern volatile enum ust_err_loglevel ust_err_loglevel
+extern int lttng_ust_log_level /* enum lttng_ust_log_level */
__attribute__((visibility("hidden")));
-void ust_err_init(void)
+extern int lttng_ust_log_critical_action /* enum lttng_ust_log_critical_action */
+ __attribute__((visibility("hidden")));
+
+/*
+ * Initialize the global log level from the "LTTNG_UST_DEBUG" environment
+ * variable and the global log critical action from "LTTNG_UST_ABORT_ON_CRITICAL".
+ *
+ * This could end up being called concurrently by multiple threads but doesn't
+ * require a mutex since the input is invariant across threads and the result
+ * will be the same.
+ */
+void lttng_ust_logging_init(void)
__attribute__((visibility("hidden")));
#ifdef LTTNG_UST_DEBUG
-static inline bool ust_err_debug_enabled(void)
+static inline
+bool lttng_ust_logging_debug_enabled(void)
{
return true;
}
#else /* #ifdef LTTNG_UST_DEBUG */
-static inline bool ust_err_debug_enabled(void)
+static inline
+bool lttng_ust_logging_debug_enabled(void)
{
- return ust_err_loglevel == UST_ERR_LOGLEVEL_DEBUG;
+ int current_log_level;
+
+ current_log_level = CMM_LOAD_SHARED(lttng_ust_log_level);
+
+ /* If the global log level is unknown, lazy-initialize it. */
+ if (caa_unlikely(current_log_level == LTTNG_UST_LOG_LEVEL_UNKNOWN)) {
+ lttng_ust_logging_init();
+ current_log_level = CMM_LOAD_SHARED(lttng_ust_log_level);
+ }
+
+ return current_log_level == LTTNG_UST_LOG_LEVEL_DEBUG;
}
-#endif /* #else #ifdef LTTNG_UST_DEBUG */
+#endif /* #ifdef LTTNG_UST_DEBUG */
+
+#ifdef LTTNG_UST_ABORT_ON_CRITICAL
+static inline
+bool lttng_ust_logging_abort_on_critical_enabled(void)
+{
+ return true;
+}
+#else /* #ifdef LTTNG_UST_ABORT_ON_CRITICAL */
+static inline
+bool lttng_ust_logging_abort_on_critical_enabled(void)
+{
+ int current_log_critical_action;
+
+ current_log_critical_action = CMM_LOAD_SHARED(lttng_ust_log_critical_action);
+
+ /* If the global log critical action is unknown, lazy-initialize it. */
+ if (caa_unlikely(current_log_critical_action == LTTNG_UST_LOG_CRITICAL_ACTION_UNKNOWN)) {
+ lttng_ust_logging_init();
+ current_log_critical_action = CMM_LOAD_SHARED(lttng_ust_log_critical_action);
+ }
+
+ return current_log_critical_action == LTTNG_UST_LOG_CRITICAL_ACTION_ABORT;
+}
+#endif /* #ifdef LTTNG_UST_ABORT_ON_CRITICAL */
/*
- * The default component for error messages.
+ * The default component for log statements.
*/
#ifndef UST_COMPONENT
#define UST_COMPONENT libust
#endif
-/* To stringify the expansion of a define */
-#define UST_XSTR(d) UST_STR(d)
-#define UST_STR(s) #s
-
-#define UST_ERR_MAX_LEN 512
+#define LTTNG_UST_LOG_MAX_LEN 512
/*
* We sometimes print in the tracing path, and tracing can occur in
* signal handlers, so we must use a print method which is signal safe.
*/
-/* Can't use dynamic allocation. Limit ourselves to UST_ERR_MAX_LEN chars. */
+/* Can't use dynamic allocation. Limit ourselves to LTTNG_UST_LOG_MAX_LEN chars. */
/* Add end of string in case of buffer overflow. */
#define sigsafe_print_err(fmt, args...) \
do { \
- if (ust_err_debug_enabled()) { \
- char ____buf[UST_ERR_MAX_LEN]; \
+ if (lttng_ust_logging_debug_enabled()) { \
+ char ____buf[LTTNG_UST_LOG_MAX_LEN]; \
int ____saved_errno; \
\
____saved_errno = errno; /* signal-safety */ \
} \
} while (0)
-#define UST_STR_COMPONENT UST_XSTR(UST_COMPONENT)
+#define LTTNG_UST_STR_COMPONENT lttng_ust_stringify(UST_COMPONENT)
#define ERRMSG(fmt, args...) \
do { \
- sigsafe_print_err(UST_STR_COMPONENT "[%ld/%ld]: " fmt " (in %s() at " __FILE__ ":" UST_XSTR(__LINE__) ")\n", \
+ sigsafe_print_err(LTTNG_UST_STR_COMPONENT "[%ld/%ld]: " fmt " (in %s() at " __FILE__ ":" lttng_ust_stringify(__LINE__) ")\n", \
(long) getpid(), \
(long) lttng_gettid(), \
## args, __func__); \
#define DBG_raw(fmt, args...) sigsafe_print_err(fmt, ## args)
#define WARN(fmt, args...) ERRMSG("Warning: " fmt, ## args)
#define ERR(fmt, args...) ERRMSG("Error: " fmt, ## args)
-#define BUG(fmt, args...) ERRMSG("BUG: " fmt, ## args)
+#define CRIT(fmt, args...) \
+ do { \
+ ERRMSG("Critical: " fmt, ## args); \
+ if (lttng_ust_logging_abort_on_critical_enabled()) { \
+ abort(); \
+ } \
+ } while(0)
#if !defined(__GLIBC__) || ((_POSIX_C_SOURCE >= 200112L || _XOPEN_SOURCE >= 600) && !defined(_GNU_SOURCE))
/*
*/
#define PERROR(call, args...) \
do { \
- if (ust_err_debug_enabled()) { \
+ if (lttng_ust_logging_debug_enabled()) { \
char perror_buf[200] = "Error in strerror_r()"; \
strerror_r(errno, perror_buf, \
sizeof(perror_buf)); \
*/
#define PERROR(call, args...) \
do { \
- if (ust_err_debug_enabled()) { \
+ if (lttng_ust_logging_debug_enabled()) { \
char *perror_buf; \
char perror_tmp[200]; \
perror_buf = strerror_r(errno, perror_tmp, \
} while(0)
#define WARN_ON_ONCE(condition) WARN_ON(condition)
-#endif /* _USTERR_SIGNAL_SAFE_H */
+#endif /* _UST_COMMON_LOGGING_H */
projects / lttng-ust.git / blobdiff