最終更新:2013-01-06 (日) 16:05:48 (4099d)
kernel.org/doc/Documentation/ioctl/ioctl-number.txt
http://kernel.org/doc/Documentation/ioctl/ioctl-number.txt
内容
- _IO - an ioctl with no parameters
- _IOW? - an ioctl with write parameters (copy_from_user)
- _IOR? - an ioctl with read parameters (copy_to_user)
- _IOWR? - an ioctl with both write and read parameters.