This isn't _really_ a bug, more of an oddity. Calling mkdir(2) on an
existing directory will fail with EACCES instead of EEXIST if the
directory couldn't have been created in the first place. For example,
this is the typical situation for /cygdrive/c:
mkdir("/cygdrive/c", 0700);
// errno == EACCES
Or from the shell:
$ mkdir /cygdrive/c
mkdir: cannot create directory ‘/cygdrive/c’: Permission denied
Compare that to Linux or *BSD (giving EEXIST):
$ mkdir /etc
mkdir: cannot create directory ‘/etc’: File exists
$ mkdir /etc
mkdir: /etc: File exists
This behavior seems to be permitted by POSIX — both are valid reasons
for this system call to fail — but it's a surprising result. I'd expect
existence to take priority.
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