[src/trunk]: src/sys/kern Add the ability to prepend a timestamp [ sec.nsec] ...

[christos <christos%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/fac7d1c2b49a
branches:  trunk
changeset: 321705:fac7d1c2b49a
user:      christos <christos%NetBSD.org@localhost>
date:      Sun Apr 01 19:29:43 2018 +0000

description:
Add the ability to prepend a timestamp [ sec.nsec] relative to boottime
in kernel messages if KLOG_TIMESTAMP is enabled.

diffstat:

 sys/kern/subr_prf.c |  32 ++++++++++++++++++++++++++++++--
 1 files changed, 30 insertions(+), 2 deletions(-)

diffs (60 lines):

diff -r 6ca5d372ddcc -r fac7d1c2b49a sys/kern/subr_prf.c
--- a/sys/kern/subr_prf.c       Sun Apr 01 19:28:17 2018 +0000
+++ b/sys/kern/subr_prf.c       Sun Apr 01 19:29:43 2018 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: subr_prf.c,v 1.164 2018/04/01 19:28:17 christos Exp $  */
+/*     $NetBSD: subr_prf.c,v 1.165 2018/04/01 19:29:43 christos Exp $  */
 
 /*-
  * Copyright (c) 1986, 1988, 1991, 1993
@@ -37,7 +37,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: subr_prf.c,v 1.164 2018/04/01 19:28:17 christos Exp $");
+__KERNEL_RCSID(0, "$NetBSD: subr_prf.c,v 1.165 2018/04/01 19:29:43 christos Exp $");
 
 #ifdef _KERNEL_OPT
 #include "opt_ddb.h"
@@ -482,6 +482,25 @@
        putone('>', TOLOG, NULL);
 }
 
+#ifdef KLOG_TIMESTAMP
+static int needtstamp = 1;
+
+static void
+addtstamp(int flags, struct tty *tp)
+{
+       char buf[64];
+       struct timespec ts;
+       int n;
+
+       getnanouptime(&ts);
+       n = snprintf(buf, sizeof(buf), "[% 9jd.%.9ld] ",
+           (intptr_t)ts.tv_sec, ts.tv_nsec);
+
+       for (int i = 0; i < n; i++)
+               putone(buf[i], flags, tp);
+}
+#endif
+
 /*
  * putchar: print a single character on console or user terminal.
  *
@@ -497,6 +516,15 @@
                return;
        }
 
+#ifdef KLOG_TIMESTAMP
+       if (needtstamp) {
+               addtstamp(flags, tp);
+               needtstamp = 0;
+       }
+
+       if (c == '\n')
+               needtstamp++;
+#endif
        putone(c, flags, tp);
 
 #ifdef DDB