On 2019-03-04, Subhashini Rao Beerisetty <subhashbeerisetty@gmail.com> wrote:
On Mon, Mar 4, 2019 at 8:27 PM Greg KH <gregkh@linuxfoundation.org> wrote:
Have you read the documentation on how to set custom baud rates? I can't find the link to it at the moment, but it is very possible to do that today, no special ioctls are needed at all. I think someone was finally working on getting glibc to support it directly, but I do not know if those patches ever got merged, so you would just have to "open code" it in userspace if you want to do this.
I could not find clear documentation on this, I’m very much thankful if someone point me on this. I thought of exploring TIOCGSERIAL and TIOCSSERIAL Ioctl’s to set custom baud rates. Now it looks like I should read the kernel code to understand how to achieve this without special ioctls.
You use the termios2 structure and TCGETS2/TCSETS ioctl calls: http://www.panix.com/~grante/arbitrary-baud.c -- Grant