Add timestamp to log

[lttng-tools.git] / src / common / error.c

diff --git a/src/common/error.c b/src/common/error.c
index eec9b7a3e3e6645d803cf03dff8590571199a438..93b69843db7c1cd7984216d6c013dcd84939f5be 100644 (file)
--- a/src/common/error.c
+++ b/src/common/error.c
@@ -17,6 +17,7 @@
 
 #define _GNU_SOURCE
 #include <assert.h>
+#include <inttypes.h>
 
 #include <lttng/lttng-error.h>
 #include <common/common.h>
@@ -25,6 +26,42 @@
 
 #define ERROR_INDEX(code) (code - LTTNG_OK)
 
+/* TLS variable that contains the time of one single log entry. */
+DEFINE_URCU_TLS(struct log_time, error_log_time);
+
+const char *log_add_time(void)
+{
+       int ret;
+       struct tm tm, *res;
+       struct timespec tp;
+       time_t now;
+
+       ret = clock_gettime(CLOCK_REALTIME, &tp);
+       if (ret < 0) {
+               goto error;
+       }
+       now = (time_t) tp.tv_sec;
+
+       res = localtime_r(&now, &tm);
+       if (!res) {
+               goto error;
+       }
+
+       /* Format time in the TLS variable. */
+       ret = snprintf(error_log_time.str, sizeof(error_log_time.str),
+                       "%02d:%02d:%02d.%06ld",
+                       tm.tm_hour, tm.tm_min, tm.tm_sec, tp.tv_nsec);
+       if (ret < 0) {
+               goto error;
+       }
+
+       return error_log_time.str;
+
+error:
+       /* Return an empty string on error so logging is not affected. */
+       return "";
+}
+
 /*
  * Human readable error message.
  */