linux-kernel - Re: [PATCH] hcidump: add support for time64 based libc

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Message-ID: <20200110210512.GB30412@brightrain.aerifal.cx>
Date:   Fri, 10 Jan 2020 16:05:12 -0500
From:   Rich Felker <dalias@...c.org>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Bluez mailing list <linux-bluetooth@...r.kernel.org>,
        y2038 Mailman List <y2038@...ts.linaro.org>,
        Johan Hedberg <johan.hedberg@...il.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Deepa Dinamani <deepa.kernel@...il.com>,
        Guy Harris <guy@...m.mit.edu>
Subject: Re: [PATCH] hcidump: add support for time64 based libc

On Fri, Jan 10, 2020 at 09:49:03PM +0100, Arnd Bergmann wrote:
> musl is moving to a default of 64-bit time_t on all architectures,
> glibc will follow later. This breaks reading timestamps through cmsg
> data with the HCI_TIME_STAMP socket option.
> 
> Change both copies of hcidump to work on all architectures.  This also
> fixes x32, which has never worked, and carefully avoids breaking sparc64,
> which is another special case.

Won't it be broken on rv32 though? Based on my (albeit perhaps
incomplete) reading of the thread, I think use of HCI_TIME_STAMP
should just be dropped entirely in favor of using SO_TIMESTAMPNS -- my
understanding was that it works with bluetooth sockets too.

Rich