Confirmed, looks like a bug.

      mask ← 8 8 8 8 ⊥ 0 7 7 7
      mask
511
      ⎕FIO['mkdir'] './ttt'
¯2
      ⎕FIO['strerror'] ¯2
No such file or directory
      )off

Goodbye.
Session duration: 53.3721 seconds



but the directory has been really created with default permission even if 
'mkdir' returned ¯2


$ ls -ld ttt
drwxrwxr-x. 1 xtian xtian 0 Jun  9 21:12 ttt/


Xtian.

On 2020-06-09 16:22, Bill Daly wrote:
       FIO_Create_mask←(8⍴8)⊥0 0 0 0 0 7 7 7
       FIO_Create_mask FIO∆mkdir '/home/dalyw/test/FIO_test'
¯2
       FIO∆strerror ¯2
No such file or directory
       FIO∆read_directory '/home/dalyw/test'
  5767711 8549106885002863117 32 4 FIO_test
       FIO∆rmdir '/home/dalyw/test/FIO_test'
0
       FIO∆read_directory '/home/dalyw/test'

thanx

w



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