This is a utility library providing access to the
mmap family of functions in a portable way. It should work on Posix and Windows systems.
mmap allows you to directly map a file into the address space of your process without having to manually read it into memory sequentially. Typically this is much more efficient for files that are larger than a few Kb.
The library offers access to the following functions:
It also provides a convenience macro called
with-mmap to perform safe, local mappings of files.
(mmap:with-mmap (addr fd size #p"/etc/lsb-release") (with-output-to-string (out) (loop for i from 0 below size for char = (code-char (cffi:mem-aref addr :char i)) do (write-char char out))))