ioctl_tcgetattr man page on DigitalUNIX

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ioctl (ULTRIX)							ioctl (ULTRIX)

       tcgetattr,  tcsetattr  - Get and set the parameters associated with the

       The manner for establishing and controlling modem connections  is  dif‐
       ferent  for  Digital  UNIX  and ULTRIX systems. The Digital UNIX system
       uses POSIX conventions for modem control. Information  about  a	serial
       line can be inspected and altered in the POSIX termios structure, using
       the tcgetattr() and tcsetattr() library functions. On  ULTRIX  systems,
       modem  control was accomplished using the TIOCCAR, IOCNAR, and TIOCWON‐
       LINE requests to the ioctl() system call. These requests are  not  sup‐
       ported  on  a  Digital  UNIX  system.  When porting source code, open a
       serial line in the following manner:

		 fd = open(ttyname, O_RDWR | O_NONBLOCK);

       The O_NONBLOCK flag enables you to complete a read request, in case the
       CLOCAL flag is not set and you are monitoring the modem status lines.

       Get the current line attributes; set the CLOCAL flag, in case it is not
       already set; and turn off the O_NONBLOCK flag in the following manner:

		 tcgetattr(fd, &tty_termios); /* get current  line  attributes
		 if ((tty_termios.c_cflag & CLOCAL) == 0) {
		 tty_termios.c_cflag |= CLOCAL;
		 tcsetattr(fd, TCSANOW, &tty_termios);

		 flags = fcntl(fd, F_GETFL)
		 fcntl(fd, F_SETFL, flags & ~O_NONBLOCK)

       You  can	 now  use  your implementation-defined process for dialing the
       phone number and negotiating with the modem. After  this,  monitor  the
       modem signals by doing the following:
		 tty_termios.c_cflag &= ~CLOCAL;
		 tcsetattr(fd,	&tty_termios);	/* watch for modem signals now
		 alarm(40); /* set a timer; do not wait forever */
		 read(fd, buffer, count);/* this read() blocks, pending the
		 appearance of modem signals */
		 alarm(0); /* turn off timer */

       See Appendix D for a comparison of an ULTRIX  application  using	 modem
       control and a Digital UNIX application using modem control. The compar‐
       ison is for an outgoing call. In addition, the appendix also
       contains a sample application for an incoming call.

       Digital UNIX Functions:

	   tcgetattr(3), tcsetattr(3) delim off

								ioctl (ULTRIX)

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