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From: "Erik E. Fair" <fair-tuhs@netbsd.org>
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To: Jacob Ritorto <jacob.ritorto@gmail.com>
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Date: Fri, 31 Dec 2021 19:18:30 -0800
Message-ID: <28153.1641007110@cesium.clock.org>
Subject: Re: [TUHS] v7 /etc/ttys and /usr/adm/wtmp shenanigans
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Classically, files don't get de-allocated (their blocks re-added to the =
filesystem free list) until the last open reference to their inode is removed, =
even if the file name is removed from all directories.

This behavior is commonly used for temporary files: open(2) with O_CREAT and =
unlink(2), and file disappears when the file descriptor is finally closed or =
the process exits without explicitly closing the descriptor (the kernel will =
close all descriptors associated with an exiting process).

Where process accounting is concerned, the kernel itself holds the inode =
reference until it is explictly told to turn off process accounting. See =
acct(2).

	Erik Fair