From 7ab1b2a97ab43ef58905801572e86b1bbb517973 Mon Sep 17 00:00:00 2001
From: Stefano Brivio <sbrivio@redhat.com>
Date: Fri, 21 May 2021 11:22:09 +0200
Subject: util: On -DDEBUG, log to stderr with timestamps

Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
---
 passt.c |  2 +-
 util.c  | 26 ++++++++++++++++++++++++++
 2 files changed, 27 insertions(+), 1 deletion(-)

diff --git a/passt.c b/passt.c
index 3637e48..2f538e4 100644
--- a/passt.c
+++ b/passt.c
@@ -795,7 +795,7 @@ int main(int argc, char **argv)
 	}
 
 #if DEBUG
-	openlog("passt", LOG_PERROR, LOG_DAEMON);
+	openlog("passt", 0, LOG_DAEMON);
 #else
 	openlog("passt", isatty(fileno(stdout)) ? 0 : LOG_PERROR, LOG_DAEMON);
 #endif
diff --git a/util.c b/util.c
index bcec7be..59a0cb2 100644
--- a/util.c
+++ b/util.c
@@ -22,18 +22,44 @@
 #include <sys/epoll.h>
 #include <syslog.h>
 #include <stdarg.h>
+#include <string.h>
+#include <time.h>
 
 #include "passt.h"
 #include "util.h"
 
+#ifdef DEBUG
 #define logfn(name, level)						\
 void name(const char *format, ...) {					\
+	char ts[sizeof("Mmm dd hh:mm:ss.")];				\
+	struct timespec tp;						\
+	struct tm *tm;							\
 	va_list args;							\
 									\
+	clock_gettime(CLOCK_REALTIME, &tp);				\
+	tm = gmtime(&tp.tv_sec);					\
+	strftime(ts, sizeof(ts), "%b %d %T.", tm);			\
+									\
+	fprintf(stderr, "%s%04lu: ", ts, tp.tv_nsec / (1000 * 1000));	\
 	va_start(args, format);						\
 	vsyslog(level, format, args);					\
 	va_end(args);							\
+	va_start(args, format);						\
+	vfprintf(stderr, format, args); 				\
+	va_end(args);							\
+	if (format[strlen(format)] != '\n')				\
+		fprintf(stderr, "\n");					\
 }
+#else
+#define logfn(name, level)						\
+void name(const char *format, ...) {					\
+	va_list args;							\
+									\
+	va_start(args, format);						\
+	vsyslog(level, format, args);					\
+	va_end(args);							\
+}
+#endif
 
 logfn(err,   LOG_ERR)
 logfn(warn,  LOG_WARNING)
-- 
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