linux-kernel - [PATCH] Do notify userspace when there is change in uts_kern

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Date:	Wed,  4 Apr 2012 17:06:31 +0530
From:	Sasikantha babu <sasikanth.v19@...il.com>
To:	Andrew Morton <akpm@...ux-foundation.org>,
	Paul Gortmaker <paul.gortmaker@...driver.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	WANG Cong <amwang@...hat.com>,
	Cyrill Gorcunov <gorcunov@...nvz.org>
Cc:	linux-kernel@...r.kernel.org,
	Sasikantha babu <sasikanth.v19@...il.com>
Subject: [PATCH] Do notify userspace when there is change in uts_kern_table.

sethostname and setdomainname notifies userspace on failure (without modifying uts_kern_table) too

Notify userspace if there is change in uts_kern_table, on failure don't notify userspace 

Signed-off-by: Sasikantha babu <sasikanth.v19@...il.com>
---
 kernel/sys.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/kernel/sys.c b/kernel/sys.c
index e7006eb..6c569a8 100644
--- a/kernel/sys.c
+++ b/kernel/sys.c
@@ -1295,8 +1295,8 @@ SYSCALL_DEFINE2(sethostname, char __user *, name, int, len)
 		memcpy(u->nodename, tmp, len);
 		memset(u->nodename + len, 0, sizeof(u->nodename) - len);
 		errno = 0;
+		uts_proc_notify(UTS_PROC_HOSTNAME);
 	}
-	uts_proc_notify(UTS_PROC_HOSTNAME);
 	up_write(&uts_sem);
 	return errno;
 }
@@ -1346,8 +1346,8 @@ SYSCALL_DEFINE2(setdomainname, char __user *, name, int, len)
 		memcpy(u->domainname, tmp, len);
 		memset(u->domainname + len, 0, sizeof(u->domainname) - len);
 		errno = 0;
+		uts_proc_notify(UTS_PROC_DOMAINNAME);
 	}
-	uts_proc_notify(UTS_PROC_DOMAINNAME);
 	up_write(&uts_sem);
 	return errno;
 }
-- 
1.7.3.4

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