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From: Milton Miller <miltonm@bga.com>
To: Ramya Desai <ramya.desai@gmail.com>
Cc: <linux-kernel@vger.kernel.org>
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Date: Tue, 09 Nov 2010 10:56:48 -0600
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On Tue Nov 09 2010 around 02:27:38 EST, Ramya Desai wrote:
> I did not understand the CRTSCTS preprocessor macro which is defined
> in termbits.h file.
..
> As per the typedefs defined in the beginning of the file, the c_cflag
> is unsigned int member in the struct termios structure. The CRTSCTS is
> defined in the file as a 48 bit value.
> 
> #define CRTSCTS 020000000000 /* flow control */

That is not a 48 bit value.

> 
> I saw the following snippet in one of the serial applications.
> 
> struct termios newtio;
> newtio.c_cflag = B9600 | CRTSCTS | CS8 | CLOCAL | CREAD;
> 
> My question is, the c_cflag is a 32 bit value member and the CRTSCTS
> is a 48 bit value. How CRTSCTS is accommodates into c_cflag variable?
> Please let me know, if my interpretation is wrong.
> 
> Thanks in advance.

Hint: constants in C may be expressed in base 16, 10, or 8.

milton