Is UNIX an open source OS ? Post: 302911211

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Operating Systems Linux Fedora Is UNIX an open source OS ? Post 302911211 by sreyan32 on Wednesday 30th of July 2014 02:04:59 PM

07-30-2014

Registered User

Quote:

Originally Posted by Corona688

The terminal device is a serial port -- either a real, physical serial port, or an emulated one(i.e, a vterm). Any proper terminal in UNIX, even a graphical one, will use one.

This is because UNIX serial devices come with lots and lots and lots of built-in software features. Have you ever hit ctrl-C to kill a stuck program? The serial port, even an emulated one in a GUI, does that directly. It has a "send SIGINT when you hit this key" setting.

I am sorry for being blunt first of all. But what you said makes absolutely no sense to me. Why would a terminal need a serial port to function ? Also I have used the terminal in both Debian and Fedora distributions. I have never made any connection to any serial port before using them !
Why would I need to do so ? OSes like Windows also offer ctrl+c combination to kill the program(not that I like comparing Windows and UNIX I am just trying to get my point across). And what do you mean by it does that directly ? How can a serial port send signals to the CPU ?

I am sorry but I don't understand what you are saying probably because I am starting out with UNIX. Do you think I should post a separate thread about this topic dealing with serial ports and terminal devices ? Because its getting off topic here.

Quote:

Originally Posted by Corona688

Imagine you're running out of space on drive C in Windows, and add another hard drive to deal with it. Now you have a drive D with lots of space -- which is no help at all since C is where you need it.

In UNIX, you could attach the new drive's partitions wherever you wanted -- /home/ for example, if that particular folder is very big.

If I am not mistaken you mean that you can move around partitions right ? For example I can unmount the /home partition and put it in a different hard disk all together and use it from there right ?
But then why would you call it "partition nesting" ? because that sounds a partition within another partition.

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LEARN ABOUT ULTRIX

dc

dc(4) Kernel Interfaces Manual dc(4)

Name
dc - serial line/mouse/keyboard

Syntax
device dc0 at ibus? vector dcintr

Description
The serial line controller provides four ports, with modem control on two of the ports. The DECstation 3100 and DECstation 2100 only pro-
vide partial modem control. The DECstation 5000 provides full modem control. The ports are used as follows:

Port Usage
0 Graphics device keyboard at 4800 BPS
1 Mouse or tablet at 4800 BPS
2 Communications port 1 (w/modem control)/local terminal
3 Communications port 2 (w/modem control)/local terminal

Each communication port from the serial line controller behaves as described in and can be set to run at any of 16 speeds. For the encod-
ing, see

When a graphics device is not being used as the system console, communications port 2 becomes the system console. In this configuration,
the port can only be used at 9600 BPS and no modem control is supported.

The serial line driver operates in interrupt-per-character mode (all pending characters are flushed from the silo on each interrupt).

Restrictions
Speed must be set to 9600 BPS on the console port and 4800 BPS on ports used by graphics devices. The serial line driver enforces this
restriction; that is, changing speeds with the command may not always work on these ports.

Files
console terminal

local terminal

See Also
console(4), devio(4), tty(4), ttys(5), MAKEDEV(8)

RISC dc(4)