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linux-kernel: [PATCH 3/3] exporting capability name/code pairs (

[PATCH 3/3] exporting capability name/code pairs (final)

From: Kohei KaiGai <kaigai_at_nospam>
Date: Fri Feb 22 2008 - 01:49:32 GMT
To: greg@kroah.com, morgan@kernel.org, serue@us.ibm.com


[3/3] A new example to use kobject/kobj_attribute

The attached 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.

KaiGai Kohei <kaigai@ak.jp.nec.com> -- 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..f99d734 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, "%d\n", (int) attr->data); +} + +static ssize_t integer_store(struct kobject *kobj, + struct kobj_attribute *attr, + const char *buf, size_t count) +{ + int code; + + sscanf(buf, "%du", &code); + attr->data = (void *) code; + return count; +} + +static struct kobj_attribute hoge_attribute = + __ATTR_DATA(hoge, 0666, integer_show, integer_store, 123); +static struct kobj_attribute piyo_attribute = + __ATTR_DATA(piyo, 0666, integer_show, integer_store, 456); +static struct kobj_attribute fuga_attribute = + __ATTR_DATA(fuga, 0444, integer_show, NULL, 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 <kaigai@ak.jp.nec.com> - To unsubscribe from this list: send the line "unsubscribe linux-security-module" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html