linux-kernel - Re: [RFC PATCH 0/8] signals: Support more than 64 signals

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Message-ID: <YdNE6UXRT02135Pd@zeniv-ca.linux.org.uk>
Date:   Mon, 3 Jan 2022 18:48:09 +0000
From:   Al Viro <viro@...iv.linux.org.uk>
To:     Walt Drummond <walt@...mmond.us>
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Subject: Re: [RFC PATCH 0/8] signals: Support more than 64 signals

On Mon, Jan 03, 2022 at 10:19:48AM -0800, Walt Drummond wrote:
> This patch set expands the number of signals in Linux beyond the
> current cap of 64.  It sets a new cap at the somewhat arbitrary limit
> of 1024 signals, both because it’s what GLibc and MUSL support and
> because many architectures pad sigset_t or ucontext_t in the kernel to
> this cap.  This limit is not fixed and can be further expanded within
> reason.

Could you explain the point of the entire exercise?  Why do we need more
rt signals in the first place?

glibc has quite a bit of utterly pointless future-proofing.  So "they
allow more" is not a good reason - not without a plausible use-case,
at least.