fuword16(9) [freebsd man page]
FETCH(9) BSD Kernel Developer's Manual FETCH(9) NAME
fetch, fubyte, fuswintr, fuword, fuword16, fuword32, fuword64, fueword, fueword32, fueword64 -- fetch data from user-space SYNOPSIS
#include <sys/types.h> #include <sys/systm.h> int fubyte(volatile const void *base); long fuword(volatile const void *base); int fuword16(volatile const void *base); int32_t fuword32(volatile const void *base); int64_t fuword64(volatile const void *base); long fueword(volatile const void *base, long *val); int32_t fueword32(volatile const void *base, int32_t *val); int64_t fueword64(volatile const void *base, int64_t *val); #include <sys/resourcevar.h> int fuswintr(void *base); DESCRIPTION
The fetch functions are designed to copy small amounts of data from user-space of the current process. If read is successful, it is per- formed atomically. The data read must be naturally aligned. The fetch routines provide the following functionality: fubyte() Fetches a byte of data from the user-space address base. The byte read is zero-extended into the results variable. fuword() Fetches a word of data (long) from the user-space address base. fuword16() Fetches 16 bits of data from the user-space address base. The half-word read is zero-extended into the results variable. fuword32() Fetches 32 bits of data from the user-space address base. fuword64() Fetches 64 bits 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. fueword() Fetches a word of data (long) from the user-space address base and stores the result in the variable pointed by val. fueword32() Fetches 32 bits of data from the user-space address base and stores the result in the variable pointed by val. fueword64() Fetches 64 bits of data from the user-space address base and stores the result in the variable pointed by val. The callers of fuword(), fuword32() and fuword64() functions cannot distinguish between -1 read from userspace and function failure. RETURN VALUES
The fubyte(), fuword(), fuword16(), fuword32(), fuword64(), and fuswintr() functions return the data fetched or -1 on failure. The fueword(), fueword32() and fueword64() functions return 0 on success and -1 on failure. SEE ALSO
copy(9), store(9) BSD
October 29, 2014 BSD
Check Out this Related Man Page
FETCH(9) BSD Kernel Developer's Manual FETCH(9) NAME
fetch, fubyte, fuswintr, fuword, fuword16, fuword32, fuword64, fueword, fueword32, fueword64 -- fetch data from user-space SYNOPSIS
#include <sys/types.h> #include <sys/systm.h> int fubyte(volatile const void *base); long fuword(volatile const void *base); int fuword16(volatile const void *base); int32_t fuword32(volatile const void *base); int64_t fuword64(volatile const void *base); long fueword(volatile const void *base, long *val); int32_t fueword32(volatile const void *base, int32_t *val); int64_t fueword64(volatile const void *base, int64_t *val); #include <sys/resourcevar.h> int fuswintr(void *base); DESCRIPTION
The fetch functions are designed to copy small amounts of data from user-space of the current process. If read is successful, it is per- formed atomically. The data read must be naturally aligned. The fetch routines provide the following functionality: fubyte() Fetches a byte of data from the user-space address base. The byte read is zero-extended into the results variable. fuword() Fetches a word of data (long) from the user-space address base. fuword16() Fetches 16 bits of data from the user-space address base. The half-word read is zero-extended into the results variable. fuword32() Fetches 32 bits of data from the user-space address base. fuword64() Fetches 64 bits 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. fueword() Fetches a word of data (long) from the user-space address base and stores the result in the variable pointed by val. fueword32() Fetches 32 bits of data from the user-space address base and stores the result in the variable pointed by val. fueword64() Fetches 64 bits of data from the user-space address base and stores the result in the variable pointed by val. The callers of fuword(), fuword32() and fuword64() functions cannot distinguish between -1 read from userspace and function failure. RETURN VALUES
The fubyte(), fuword(), fuword16(), fuword32(), fuword64(), and fuswintr() functions return the data fetched or -1 on failure. The fueword(), fueword32() and fueword64() functions return 0 on success and -1 on failure. SEE ALSO
copy(9), store(9) BSD
October 29, 2014 BSD