Date: Sat, 4 Apr 2026 08:34:48 -0700 From: Rick Macklem <rick.macklem@gmail.com> To: =?UTF-8?Q?Dag=2DErling_Sm=C3=B8rgrav?= <des@freebsd.org> Cc: FreeBSD CURRENT <freebsd-current@freebsd.org> Subject: Re: Getting boottime early in booting Message-ID: <CAM5tNy6ewm69xtkfr=nvMSZA3-cb57mpkqJ644y442Tx2XQSmg@mail.gmail.com> In-Reply-To: <86mrzjumyg.fsf@ltc.des.dev> References: <CAM5tNy4mPmG=OmQtiGrMQ8NnPZrN=dw_Xw1h9=s4iyOLiZCWng@mail.gmail.com> <86mrzjumyg.fsf@ltc.des.dev>
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On Sat, Apr 4, 2026 at 1:52 AM Dag-Erling Smørgrav <des@freebsd.org> wrote: > > Rick Macklem <rick.macklem@gmail.com> writes: > > 1 - I need a value that will be different each time the machine boots. > > I would normally use getboottime(), but for the NFS root fs mount, > > it just returns 0. > > Any ideas w.r.t. something I can acquire early in booting that will > > change each time the system is booted? > > Just use arc4random(9). Yes, that does seem to work now. (It didn't seem to be working when I tried before posting? For the very old i386 system I am testing on, arc4random() works for me, if I wait until I really need the value, which is when the RPC is being done to the NFS server. Before testing, I was trying arc4random() much earlier in the boot.) For a UEFI laptop, it looks like arc4random() works quite early in the boot. (It has the entropy_efi_seed=YES in it's boot variables.) Anyhow, thanks everyone, for the useful hints, rick > > DES > -- > Dag-Erling Smørgrav - des@FreeBSD.orghome | help
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