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Full Discussion: How to read the CTS and DSR of RS232 in Unix using C language?
Top Forums Programming How to read the CTS and DSR of RS232 in Unix using C language? Post 302302765 by nomist on Wednesday 1st of April 2009 12:46:14 AM
Old 04-01-2009
Something like the following will probably do the trick:
Code:
bool getCTS(int fd)
{
    int s;
    /* Read terminal status line: Clear To Send */
    ioctl(fd, TIOCMGET, &s);
    return (s & TIOCM_CTS) != 0;
}
bool getDSR(int fd)
{
    int s;
    /* Read terminal status line: Data Set Ready */
    ioctl(fd, TIOCMGET, &s);
    return (s & TIOCM_DSR) != 0;
}

 

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gtty

stty(2) 							System Calls Manual							   stty(2)

NAME

       stty(), gtty() - control terminal device (Bell Version 6 compatibility)

SYNOPSIS

   Remarks
       These system calls are preserved for backward compatibility with Bell Version 6.  They provide as close an approximation as possible to the
       old Version 6 functions.  All new code should use the and calls described in termio(7).

DESCRIPTION

       For certain status settings and status inquiries about terminal devices, the functions and are equivalent to

       and

       respectively (see ioctl(2) and termio(7).

RETURN VALUE

       and return the following values:

	      Successful completion.
	      Failure.
		     is set to indicate the error.

ERRORS

       If or fails, is set to one of the following values:

       [EBADF]	      is not a valid file descriptor.

       [EFAULT]       points to an invalid address.

WARNINGS

   Obsolescent Interfaces
       and are to be obsoleted at a future date.

SEE ALSO

       stty(1), exec(2), ioctl(2), sttyV6(7), termio(7), tty(7).

								  TO BE OBSOLETED							   stty(2)
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