From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1759211AbYDVLSe (ORCPT ); Tue, 22 Apr 2008 07:18:34 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751055AbYDVLSY (ORCPT ); Tue, 22 Apr 2008 07:18:24 -0400 Received: from TYO201.gate.nec.co.jp ([202.32.8.193]:44630 "EHLO tyo201.gate.nec.co.jp" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750726AbYDVLSX (ORCPT ); Tue, 22 Apr 2008 07:18:23 -0400 Message-ID: <480DC96B.30108@ak.jp.nec.com> Date: Tue, 22 Apr 2008 20:18:03 +0900 From: KaiGai Kohei User-Agent: Thunderbird 2.0.0.6 (Windows/20070728) MIME-Version: 1.0 To: greg@kroah.com, morgan@kernel.org, serue@us.ibm.com, chrisw@sous-sol.org CC: linux-security-module@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH 3/3] a new example to use kobject/kobj_attribute References: <47C25AE9.7080305@ak.jp.nec.com> <480DC80F.3060403@ak.jp.nec.com> In-Reply-To: <480DC80F.3060403@ak.jp.nec.com> Content-Type: text/plain; charset=ISO-2022-JP Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org [PATCH 3/3] a new example to use kobject/kobj_attribute This patch can provide a new exmple to use kobject and attribute. The _show() and _store() method can refer/store the private data field of kobj_attribute structure to know what entries are accessed by users. It will make easier to share a single _show()/_store() method with several entries. Signed-off-by: KaiGai Kohei -- samples/kobject/kobject-example.c | 32 ++++++++++++++++++++++++++++++++ 1 files changed, 32 insertions(+), 0 deletions(-) diff --git a/samples/kobject/kobject-example.c b/samples/kobject/kobject-example.c index 08d0d3f..5486a14 100644 --- a/samples/kobject/kobject-example.c +++ b/samples/kobject/kobject-example.c @@ -77,6 +77,35 @@ static struct kobj_attribute baz_attribute = static struct kobj_attribute bar_attribute = __ATTR(bar, 0666, b_show, b_store); +/* + * You can store a private data within 'data' field of kobj_attribute. + * It enables to share a single _show() or _store() method with several + * entries. + */ +static ssize_t integer_show(struct kobject *kobj, + struct kobj_attribute *attr, + char *buf) +{ + return scnprintf(buf, PAGE_SIZE, "%ld\n", (long) attr->data); +} + +static ssize_t integer_store(struct kobject *kobj, + struct kobj_attribute *attr, + const char *buf, size_t count) +{ + long code; + + sscanf(buf, "%ld", &code); + attr->data = (void *) code; + return count; +} + +static struct kobj_attribute hoge_attribute = + __ATTR_DATA(hoge, 0666, integer_show, integer_store, (long) 123); +static struct kobj_attribute piyo_attribute = + __ATTR_DATA(piyo, 0666, integer_show, integer_store, (long) 456); +static struct kobj_attribute fuga_attribute = + __ATTR_DATA(fuga, 0444, integer_show, NULL, (long) 789); /* * Create a group of attributes so that we can create and destory them all @@ -86,6 +115,9 @@ static struct attribute *attrs[] = { &foo_attribute.attr, &baz_attribute.attr, &bar_attribute.attr, + &hoge_attribute.attr, + &piyo_attribute.attr, + &fuga_attribute.attr, NULL, /* need to NULL terminate the list of attributes */ }; -- OSS Platform Development Division, NEC KaiGai Kohei