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Subject: Re: [9front] Mail rewrite; open path with stored mails
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> +	if(atexit(removeopened) == 0) {
> +		removeopened();
> +		sysfatal("atexit: %r");
> +	}

This is not how atexit(2) works.  The idea is that you would do
atexit(removeopened) *once* in main which arranges for removeopened to
be called on the way out of the program.  The following should
suffice:

	if(atexit(removeopened) == 0)
		sysfatal("atexit: %r");