--- /dev/null
+#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; 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 <string.h>
+#include <sys/types.h>
+#include <sys/syscall.h>
+#include <errno.h>
+#include <stdarg.h>
+#include <stdio.h>
+
+#include <lttng/core.h>
+#include <lttng/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
+#endif
+
+/* To stringify the expansion of a define */
+#define UST_XSTR(d) UST_STR(d)
+#define UST_STR(s) #s
+
+#define USTERR_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.
+ */
+
+extern int ust_safe_snprintf(char *str, size_t n, const char *fmt, ...)
+ __attribute__ ((format (printf, 3, 4)));
+
+static inline void __attribute__ ((format (printf, 1, 2)))
+ __check_ust_safe_fmt(const char *fmt, ...)
+{
+}
+
+#define sigsafe_print_err(fmt, args...) \
+{ \
+ /* Can't use dynamic allocation. Limit ourselves to USTERR_MAX_LEN chars. */ \
+ char ____buf[USTERR_MAX_LEN]; \
+ 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 UST_XSTR(UST_COMPONENT)
+
+#define ERRMSG(fmt, args...) \
+ do { \
+ sigsafe_print_err(UST_STR_COMPONENT "[%ld/%ld]: " fmt " (in %s() at " __FILE__ ":" UST_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)
+#else
+# 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)
+#define BUG(fmt, args...) ERRMSG("BUG: " fmt, ## args)
+
+#if (_POSIX_C_SOURCE >= 200112L || _XOPEN_SOURCE >= 600) && !defined(_GNU_SOURCE)
+#define PERROR(call, args...)\
+ do { \
+ char buf[200] = "Error in strerror_r()"; \
+ strerror_r(errno, buf, sizeof(buf)); \
+ ERRMSG("Error: " call ": %s", ## args, buf); \
+ } while(0);
+#else
+#define PERROR(call, args...)\
+ do { \
+ char *buf; \
+ char tmp[200]; \
+ buf = strerror_r(errno, tmp, sizeof(tmp)); \
+ ERRMSG("Error: " call ": %s", ## args, buf); \
+ } while(0);
+#endif
+
+#define BUG_ON(condition) \
+ do { \
+ if (caa_unlikely(condition)) \
+ ERR("condition not respected (BUG) on line %s:%d", __FILE__, __LINE__); \
+ } while(0)
+#define WARN_ON(condition) \
+ do { \
+ if (caa_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 */
projects / ust.git / blobdiff