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Message-ID: <aY315MyaQp66kBVq@intrepid>
Date: Thu, 12 Feb 2026 16:47:16 +0100
From: Markus Wichmann <nullplan@....net>
To: musl@...ts.openwall.com
Cc: "Kokkonda, Sundeep" <Sundeep.Kokkonda@...driver.com>
Subject: Re: Question: Support for custom (non-standard) baud rates in
musl
Am Wed, Feb 11, 2026 at 08:33:46PM +0000 schrieb Dora, Sunil Kumar:
> 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.
> Thank you for your time.
> Best regards,
> Sunil Dora
>
There is currently no support for arbitrary baud rates. If it is ever
added, then likely via cfsetospeed().
Ciao,
Markus
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