Hi all, In the context of a serial driver what is the significance of the TERMIOS struct?? If a person wanted to write his own serial port driver would he be required to implement the TTY layer as well (as it is implemented by tty_io.c in th Linux sources)?? ThanX mandeep Mandeep Singh Sandhu Software Engineer Infosys Technologies Ltd Bangalore 560100 -----Original Message----- From: Jan Hudec [mailto:bulb@ucw.cz] Sent: Friday, December 05, 2003 4:03 PM To: Vanitha Ramaswami Cc: 'kernelnewbies@nl.linux.org' Subject: Re: Help Required in starting two ppp sessions on a single Physical Device On Fri, Dec 05, 2003 at 16:40:56 +0800, Vanitha Ramaswami wrote: > Hi All, > > I am running PPPD over a synchrouns serial interface (right now > it is the sangoma serial card) and it will be soon replaced by our > proprietary hardware. I am having only one port of the physical device > i.e ttyWP0. But i want two sessions of ppp bind to the same physical > device ttyWP0. > > Why i want to run two ppp sessions over the single physical device is > because we will be introducing a new layer specific to our satellite systems, > so that at Layer 1 level each ppp sessions will be running at different > carrier frequencies. Since i have only one physical port and in need of running > more than one ppp sessions, i am looking for a way to modify pppd. The problem is, that the single device does not know, how to combine the two data streams into the physical line. So either the hardware will do the combining (and thus look as two devices to CPU and thus you will have two devices) or you will need some code for it. This code can be either a kernel driver for the hardware, in which case it would present TWO devices to userland and pppd would be happy, or it can be in userland. If it should be in userland, it would combine two streams comming from two file descriptors. If these descriptors refer to ptys, ppp daemons would happily run on the other ends... ------------------------------------------------------------------------------- Jan 'Bulb' Hudec <bulb@ucw.cz> -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/ -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/
