Examples

   1.umask (0002); /* turn world write access off */

     mkdir ("sys$disk:[.parentdir.childdir]", 0222); 
                                /* turn write access on */

     Parent directory file protection: System:RWD, Owner:RWD,
                                          Group:R, World:R

     The file protection derived from the combination of the mode
     argument and the file protection mask set by umask is (0222)
     & ~(0002), which is 0220. When the parent directory defaults
     are applied to this protection, the protection for the new
     directory becomes:

       File protection:    System:RWD, Owner:RWD, Group:RWD, World:R

   2.umask (0000);

     mkdir ("sys$disk:[.parentdir.childdir]", 0444);  
                                /* turn read access on */

     Parent directory file protection: System:RWD, Owner:RWD,
                                         Group:RWD, World:RWD

     The file protection derived from the combination of the mode
     argument and the file protection mask set by umask is (0444)
     & ~(0000), which is 0444. When the parent directory defaults
     are applied to this protection, the protection for the new
     directory is:

       File protection:    System:RW, Owner:RW, Group:RW, World:RW

     Note that delete access is not inherited.