Not a directory

Cause
A non-directory was specified where a directory is required, such as a path prefix or
an argument to the chdir(2) call.
Action
Look at a listing of all the files in the current directory and try again, specifying a
directory instead of a file.

Technical Notes
The symbolic name for this error is ENOTDIR, errno=20.

Not a stream device

Cause
A putmsg(2) or getmsg(2) system call was attempted on a file descriptor that is
not a STREAMS device.

Technical Notes
The symbolic name for this error is ENOSTR, errno=60.