netfilter 08/09: xt_time: print timezone for user information

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From: Linux Kernel Mailing List
Date: Thursday, January 15, 2009 - 7:02 pm

Gitweb:     http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=e6210f...
Commit:     e6210f3be5b13b6cda9c8dad8926818a73c8e6ac
Parent:     cd7fcbf1cb6933bfb9171452b4a370c92923544d
Author:     Jan Engelhardt <jengelh@medozas.de>
AuthorDate: Mon Jan 12 00:06:10 2009 +0000
Committer:  David S. Miller <davem@davemloft.net>
CommitDate: Mon Jan 12 21:18:36 2009 -0800

    netfilter 08/09: xt_time: print timezone for user information
    
    netfilter: xt_time: print timezone for user information
    
    Let users have a way to figure out if their distro set the kernel
    timezone at all.
    
    Signed-off-by: Jan Engelhardt <jengelh@medozas.de>
    Signed-off-by: Patrick McHardy <kaber@trash.net>
    Signed-off-by: David S. Miller <davem@davemloft.net>
---
 net/netfilter/xt_time.c |   11 +++++++++++
 1 files changed, 11 insertions(+), 0 deletions(-)

diff --git a/net/netfilter/xt_time.c b/net/netfilter/xt_time.c
index 29375ba..93acaa5 100644
--- a/net/netfilter/xt_time.c
+++ b/net/netfilter/xt_time.c
@@ -243,6 +243,17 @@ static struct xt_match xt_time_mt_reg __read_mostly = {
 
 static int __init time_mt_init(void)
 {
+	int minutes = sys_tz.tz_minuteswest;
+
+	if (minutes < 0) /* east of Greenwich */
+		printk(KERN_INFO KBUILD_MODNAME
+		       ": kernel timezone is +%02d%02d\n",
+		       -minutes / 60, -minutes % 60);
+	else /* west of Greenwich */
+		printk(KERN_INFO KBUILD_MODNAME
+		       ": kernel timezone is -%02d%02d\n",
+		       minutes / 60, minutes % 60);
+
 	return xt_register_match(&xt_time_mt_reg);
 }
 
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