S9 EXT  (sys:lstat string)  ==>  alist | #f
        (sys:stat string)   ==>  alist | #f

Return the file status of the file STRING or #F if the file
cannot be accessed. When STRING references a symbolic link,
return information about the linked rather than the file
referenced by it. The association list return in case of
success has the following members:

        ((name  . string)    ; file name
         (size  . integer)   ; size in bytes
         (uid   . integer)   ; UID of owner
         (gid   . integer)   ; GID of owner
         (mode  . integer)   ; access bits
         (ctime . integer)   ; inode change time
         (atime . integer)   ; access time
         (mtime . integer)   ; modification time
         (dev   . integer)   ; device ID of containing device
         (ino   . integer)   ; inode number
         (nlink . integer))  ; number of (hard) links

SYS:STAT dereferences symlinks while SYS:LSTAT operates on the
symlinks themselves.

(sys:stat "s9.c")  ==>  ((name . "s9.c")
                         (size . 91450)
                         (uid . 1001)
                         (gid . 1001)
                         (mode . 33188)
                         (ctime . 1272258596)
                         (atime . 0)
                         (mtime . 1272258596)
                         (dev . 83)
                         (ino . 496912)
                         (nlink . 1))
