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NetBSD 6.1.5 - man page for fubyte (netbsd section 9)

FETCH(9)			  BSD Kernel Developer's Manual 			 FETCH(9)

NAME
     fetch, fubyte, fuibyte, fusword, fuswintr, fuword, fuiword -- fetch data from user-space

SYNOPSIS
     #include <sys/types.h>
     #include <sys/systm.h>

     int
     fubyte(const void *base);

     int
     fusword(const void *base);

     int
     fuswintr(const void *base);

     long
     fuword(const void *base);

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.

     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.  Note that these functions all
     do "unsigned" access, and therefore will never sign extend byte or short values.  This pre-
     vents ambiguity with the error return value for all functions except fuword().

SEE ALSO
     copy(9), store(9)

BUGS
     The function fuword() has no way to unambiguously signal an error, because the data it reads
     might legitimately be the same as the -1 used to indicate an error.  The other functions do
     not have this problem because the unsigned values returned by those can never match the -1
     error return value.

BSD					 January 7, 1996				      BSD


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