monty_hall
July 3rd, 2009, 06:07
In </dev/usb/usb.h>, I see the following def:
#define USB_REQUEST _IOWR('U', 1, struct usb_ctl_request)
I was wondering what the 'U' (group code per ioccom.h) stood for and then grepped /usr/src for _IOWR and noticed several different group codes. Is there a list or document about ioctl & group codes?
Monty
#define USB_REQUEST _IOWR('U', 1, struct usb_ctl_request)
I was wondering what the 'U' (group code per ioccom.h) stood for and then grepped /usr/src for _IOWR and noticed several different group codes. Is there a list or document about ioctl & group codes?
Monty