Checking currently open files on my /Volumes/UNTITLED gives me 2 entries:$ sudo lsof /Volumes/UNTITLED/COMMAND PID USER   FD   TYPE DEVICE SIZE/OFF NODE NAMEmds      62 root    8r   DIR    1,6    32768    2 /Volumes/UNTITLEDmds      62 root   19r   DIR    1,6    32768    2 /Volumes/UNTITLED$When I run diskutil unmountDisk disk2, all descriptors are successfully closed (e.g. I cannot do lsof /Volumes/UNTITLED/ anymore, since the folder is gone).What exactly diskutil unmountDisk does to close file descriptors? Can I close file descriptors myself?As far as I understand diskutil is closed source. Can the question be answered by taking umount?AgendaBasically I'm trying to understand how to tell a process close a given file descriptor, e.g. emulate what unmount does.I think telling the process to close a file descriptor should be illegal, as generally it can easily cause process to crash. However I think diskutil unmountDisk somehow manages to gently asks mds to no longer possess the file.I'm curious if I can ask gently too. I know there's a endfsent OS function, but it's not a program, I cannot run it to manipulate file descriptors open by different processes.
How unmounting closes file descriptors?
osx;file descriptors;unmounting