Re:The Earliest Unix Code: An Anniversary Source Code Release
by kazinator on Thursday October 17, 2019 @07:25PM
(#21287284)
But the program appears to fail if dotdot can't be opened for reading, and it appears to scan through it doing reads first. Then it closes and does a creat, which is expected to succeed also. I'm suspecting that at this stage of development, open may have been used for reading and creat for writing (including to an existing file).
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Re:The Earliest Unix Code: An Anniversary Source Code Release
by kps on Thursday October 17, 2019 @10:45PM
(#21288220)
From TFS¹, creat() on an existing file truncates it (i.e. to length zero, as O_TRUNC), and only the superuser can do this to a directory. open() has read/write flag bits as now.
I am leaning toward Pete_D's ‘pack directory’ idea.
¹ https://github.com/DoctorWkt/pdp7-unix/blob/e94417092a2980e7...