From: Karel Zak <kzak@redhat.com>
Date: Thu, 6 Feb 2014 10:48:40 +0000 (+0100)
Subject: dmesg: -w output not line-buffered
X-Git-Tag: v2.25-rc1~623
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=3938c08cd56a7c83ea387073c1404d0e864c9fa3;p=thirdparty%2Futil-linux.git

dmesg: -w output not line-buffered

when writing to e.g. a pipe, output from dmesg -w can come many
minutes late due to buffering.

Addresses: https://bugzilla.redhat.com/show_bug.cgi?id=1060925
Signed-off-by: Karel Zak <kzak@redhat.com>
---

diff --git a/sys-utils/dmesg.c b/sys-utils/dmesg.c
index ec39612fbc..3ed0b1db75 100644
--- a/sys-utils/dmesg.c
+++ b/sys-utils/dmesg.c
@@ -1010,6 +1010,8 @@ static int init_kmsg(struct dmesg_control *ctl)
 
 	if (!ctl->follow)
 		mode |= O_NONBLOCK;
+	else
+		setlinebuf(stdout);
 
 	ctl->kmsg = open("/dev/kmsg", mode);
 	if (ctl->kmsg < 0)