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Message-ID: <20260212161603.GW1827@brightrain.aerifal.cx>
Date: Thu, 12 Feb 2026 11:16:03 -0500
From: Rich Felker <dalias@...c.org>
To: "Dora, Sunil Kumar" <SunilKumar.Dora@...driver.com>
Cc: "musl@...ts.openwall.com" <musl@...ts.openwall.com>,
"Kokkonda, Sundeep" <Sundeep.Kokkonda@...driver.com>
Subject: Re: Question: Support for custom (non-standard) baud rates in
musl
On Wed, Feb 11, 2026 at 08:33:46PM +0000, Dora, Sunil Kumar wrote:
> Hi,
> I am currently investigating a build issue in GDB related to setting custom (non-standard) baud rates on Linux.
> >From reviewing musl's termios implementation, I noticed:
>
> *
> cfsetospeed / cfsetispeed appear to return EINVAL for non-standard baud rates.
> *
> The c_ispeed / c_ospeed fields are not exposed with the same naming as in glibc.
> *
> Linux-specific interfaces such as termios2, BOTHER, TCGETS2, etc., are not visible through the standard musl headers.
>
> I would like to confirm whether the lack of support for arbitrary/custom baud rates (via BOTHER / termios2) is an intentional design decision in musl.
> If custom baud rates are expected to work on musl-based Linux systems, I would appreciate guidance on the correct and supported approach.
There was a thread on this topic a while back,
https://www.openwall.com/lists/musl/2024/04/11/5
I don't think we arrived at any good conclusion for the right way to
support this.
Rich
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