[PATCH v3] log: add timestamp for log

[luzhipeng <luzhipeng@cestc.cn>]

From: Zhipeng Lu <luzhipeng@cestc.cn>

add timestamp for log

Signed-off-by: Zhipeng Lu <luzhipeng@cestc.cn>
---
 lib/eal/common/eal_common_log.c | 25 ++++++++++++++++++++++++-
 1 file changed, 24 insertions(+), 1 deletion(-)

diff --git a/lib/eal/common/eal_common_log.c b/lib/eal/common/eal_common_log.c
index bd7b188ceb..46dbd4b7bf 100644
--- a/lib/eal/common/eal_common_log.c
+++ b/lib/eal/common/eal_common_log.c
@@ -480,6 +480,27 @@ rte_log_dump(FILE *f)
 	}
 }
 
+/* get timestamp*/
+static void
+rte_log_get_timestamp_prefix(char *buf, int buf_size)
+{
+	struct tm *info;
+	char date[24];
+	struct timespec ts;
+	long usec;
+
+	clock_gettime(CLOCK_REALTIME, &ts);
+	info = localtime(&ts.tv_sec);
+	usec = ts.tv_nsec / 1000;
+	if (info == NULL) {
+		snprintf(buf, buf_size, "[%s.%06ld] ", "unknown date", usec);
+		return;
+	}
+
+	strftime(date, sizeof(date), "%Y-%m-%d %H:%M:%S", info);
+	snprintf(buf, buf_size, "[%s.%06ld] ", date, usec);
+}
+
 /*
  * Generates a log message The message will be sent in the stream
  * defined by the previous call to rte_openlog_stream().
@@ -489,6 +510,7 @@ rte_vlog(uint32_t level, uint32_t logtype, const char *format, va_list ap)
 {
 	FILE *f = rte_log_get_stream();
 	int ret;
+	char timestamp[64];
 
 	if (logtype >= rte_logs.dynamic_types_len)
 		return -1;
@@ -498,7 +520,8 @@ rte_vlog(uint32_t level, uint32_t logtype, const char *format, va_list ap)
 	/* save loglevel and logtype in a global per-lcore variable */
 	RTE_PER_LCORE(log_cur_msg).loglevel = level;
 	RTE_PER_LCORE(log_cur_msg).logtype = logtype;
-
+	rte_log_get_timestamp_prefix(timestamp, sizeof(timestamp));
+	fprintf(f, "%s ", timestamp);
 	ret = vfprintf(f, format, ap);
 	fflush(f);
 	return ret;
-- 
2.31.1