FETCH(9)

NAME
fetch, fubyte, fuword32, fuwordadd32, fuword64, fuwordadd64 - fetch data from user-space

SYNOPSIS
#include <sys/types.h>
#include <sys/time.h>
#include <sys/systm.h>
#include <sys/resourcevar.h>
int
fubyte(const uint8_t *base);
int32_t
fuword32(const uint32_t *base);
uint32_t
fuwordadd32(volatile uint32_t *p, uint32_t val);
int64_t
fuword64(const uint64_t *base);
uint64_t
fuwordadd64(volatile uint64_t *p, uint64_t val);

DESCRIPTION
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.

fuword32()
    Fetches 32 bits of data from the user-space address base.

fuwordadd32()
    Fetches 32 bits of data from the user-space address p, adds val, and stores the result back to the user-space address p.

fuword64()
    Fetches 64 bits of data from the user-space address base.

fuwordadd64()
    Fetches 64 bits of data from the user-space address p, adds val, and stores the result back to the user-space address p.

RETURN VALUES
The fetch functions return the data fetched or -1 on failure.

SEE ALSO
copy(9), store(9)