int
secure_path(
const char *path
)
)
function takes a path name and returns zero if the referenced file is
``secure'',
non-zero if not.
Any
``insecurity'',
other than failure to access
the referenced file, will be logged to the system log.
To be ``secure'', the referenced file must exist, be a regular file (and not a directory), owned by the super-user, and writable only by the super-user.