linux-kernel - Re: serial: custom baud rate

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20180513205726.5029c88a@alans-desktop>
Date:   Sun, 13 May 2018 20:57:26 +0100
From:   Alan Cox <gnomes@...rguk.ukuu.org.uk>
To:     Grant Edwards <grant.b.edwards@...il.com>
Cc:     linux-kernel@...r.kernel.org, linux-serial@...r.kernel.org
Subject: Re: serial: custom baud rate

On Thu, 3 May 2018 18:27:14 +0000 (UTC)
Grant Edwards <grant.b.edwards@...il.com> wrote:

> On 2018-05-03, Muni Sekhar <munisekharrms@...il.com> wrote:
> 
> > If I need to set a custom baud rates(e.g. 14400, 128000, 256000), does
> > Linux serial framework has any supporting method?  
> 
> Sure, use the termios2 structure instead of the termios structure:
> 
>   #include <linux/termios.h>
> 
>   struct termios2 t;
> 
>   ioctl(fd, TCGETS2, &t)
> 
>   t.c_cflag &= ~CBAUD;
>   t.c_cflag |= BOTHER;
>   t.c_ispeed = baud;
>   t.c_ospeed = baud;
> 
>   ioctl(fd, TCSETS2, &t)
> 
> [Not all devices/drivers support termios2]

That shouldn't be true - all devices get passed ispeed/ospeed and
everything in tree was using the correct fields as far as I could tell
last time I checked this

Alan