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fuword(9)

The  functions  are  designed  to copy small amounts of data from
user-space of the current process.  If read is successful, it  is
performed  atomically.   The data read must be naturally aligned.
The routines provide the following functionality: Fetches a  byte
of  data  from  the  user-space address The byte read is zero-ex‐
tended into the results variable.  Fetches a word of data  (long)
from  the  user-space  address  Fetches  16 bits of data from the
user-space address The half-word read is zero-extended  into  the
results  variable.   Fetches  32 bits of data from the user-space
address Fetches 64 bits  of  data  from  the  user-space  address
Fetches  a  word  of  data (long) from the user-space address and
stores the result in the variable pointed by Fetches 32  bits  of
data  from  the  user-space  address and stores the result in the
variable pointed by Fetches 64 bits of data from  the  user-space
address  and  stores  the  result  in the variable pointed by The
callers of and functions cannot distinguish between -1 read  from
userspace  and  function  failure.   The and functions return the
data fetched or -1 on failure.  The and  functions  return  0  on
success and -1 on failure.















































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