fetch(9) - Manual pages

NAME

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

#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);

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.

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