chickadee » chicken » file » posix » file-creation-mode

Returns the initial file permissions used for newly created files (as with umask(2)). If MODE is supplied, the mode is changed to this value. You can set the mode by executing

 (set! (file-creation-mode) MODE)

or

 (file-creation-mode MODE)

where MODE is a bitwise combination of one or more of the perm/... flags.