fetch9
Fetch data from user-space
Usage
#include <sys/types.h>
#include <sys/time.h>
#include <sys/systm.h>
#include <sys/resourcevar.h>
int
fubyte(const void *base);
int
fusword(void *base);
int
fuswintr(void *base);
long
fuword(const void *base);
Overview
The fetch functions are designed to copy small amounts of data from user-space.
The fetch routines provide the following functionality:
fubyte()-
Fetches a byte of data from the user-space address base.
fusword()-
Fetches a short word of data from the user-space address base.
fuswintr()-
Fetches a short word of data from the user-space address base. This function is safe to call during an interrupt context.
fuword()-
Fetches a word of data from the user-space address base.
Return values
The fetch functions return the data fetched or -1 on failure.