Those are forward declarations as they are being used in defining struct bus_attribute. It's nothing special about GNU-C. That's the case for ANSI-C too. Pretty standard.
--
On Wed, May 30, 2012 at 10:20 PM, harryxiyou <harryxiyou@xxxxxxxxx> wrote:
Hi guys,
When I read the linux/device.h file for some device driver usage, i find some
confusions like following.
$ head -60 device.h
[...]
struct device;
struct device_private;
struct device_driver;
struct driver_private;
struct module;
struct class;
struct subsys_private;
struct bus_type;
struct device_node;
struct iommu_ops;
struct bus_attribute {
struct attribute attr;
ssize_t (*show)(struct bus_type *bus, char *buf);
ssize_t (*store)(struct bus_type *bus, const char *buf, size_t count);
};
[...]
I have never seen struct define like
"struct device;
struct device_private;
struct device_driver;
[...]
struct device_node;
struct iommu_ops;"
The common define is like this
"struct a{
int a;
int b;
[...]
}"
Is this just struct declaration or some extension about gcc? Cloud
anyone give me
some explanations?
Thanks in advance ;-)
Note: my kernel version is 3.0 around.
--
Thanks
Harry Wei
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Gaurav Jain
Associate Software Engineer
VxVM Escalations Team, SAMG
Symantec Software India Pvt. Ltd.
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