linux-kernel - Doubt about CRTSCTS preprocessor macro definition in termbits.h file

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Message-ID: <AANLkTimPOAN2JSiYEQJ7VOQxVStzFxpStngZD2kepf7J@mail.gmail.com>
Date:	Tue, 9 Nov 2010 12:57:27 +0530
From:	Ramya Desai <ramya.desai@...il.com>
To:	linux-kernel@...r.kernel.org
Subject: Doubt about CRTSCTS preprocessor macro definition in termbits.h file

Dear All,

I did not understand the CRTSCTS preprocessor macro which is defined
in termbits.h file.

http://lxr.linux.no/linux+v2.6.36/include/asm-generic/termbits.h

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 */

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.

Regards,
Ramya.
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