I lost the original message sorry.
1. There aren't man pages for kernel functions, you pretty much need
to read headers, ask questions and steal other peoples code.
2.
you need to compile with -O2 in order to get gcc to realize
that it knows that sizeof(*(static char*)) is always
one. without -O2, gcc just takes the switch that put_user
expands to and compiles it in, thus the undefined reference to
put_user_X .
3.
You don't want to put full paths in your headers.
Try compiling it with
gcc -O2 -I/usr/src/linux/include -c foobar.c
and you can get rid of the </usr/src/..../uaccess.h> ugliness
have fun,
greg
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