+#define ERRMSG(fmt, args...) do { sigsafe_print_err(UST_STR_COMPONENT "[%ld/%ld]: " fmt " (" __FILE__ ":" XSTR(__LINE__) ")\n", (long) getpid(), (long) syscall(SYS_gettid), ## args); fflush(stderr); } while(0)
+
+#define DEBUG
+#ifdef DEBUG
+# define DBG(fmt, args...) ERRMSG(fmt, ## args)
+#else
+# define DBG(fmt, args...) do {} 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 (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)