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 DEBIAN

cyclades-devices

cyclades-devices(5)													       cyclades-devices(5)

NAME

       cyclades-devices - tables for driving cyclades-serial-client

DESCRIPTION

       The  cyclades-devices  file  supplies all mapping between Unix device files (/dev/*) and the addresses of serial ports of Cyclades Terminal
       Servers. It contains one entry for each serial port, with the following format:

       device:rastype:rasname:physport:type:options

       Note: A # character at beginning of line indicates a comment

       The entry fields are:

       devname
	      - A full pathname of the file that will be associated to the serial port. It must start with  a "/dev/" preffix.	Two naming schemes
	      may  be  used here: - devname does not exist, and will be linked to a free pseudo-tty. This is the default behavior of cyclades-ser-
	      cli.  - devname is the name of a valid slave pseudo-tty.	In this case, the '-t 1' option must be assigned in options field.  (Note:
	      this option is not supported by this release).

       rastype
	      - Terminal Server type: - prts, for Cyclades Pr302X/TS Terminal Servers.	- path, for Cyclades PathRAS Terminal Server.

       rasname
	      - Host Name or IP Address of the Terminal Server where the serial port resides.

       physport
	      -  Number  of physical port in the Terminal Server. If treated as the IP address associated with this port, in a IP-based addressing
	      scheme.

       type   - Server type that will be contacted to handle the serial port: - rtelnet, for Remote Telnet Server - socket, for Socket Server

       options
	      - Per-port specific options, passed to cyclades-ser-cli program.

EXAMPLES

       1. Device on a PR3020/TS Terminal Server pr3k Port 1, accessed through /dev/ctty01 device file name, using telnet protocol  (remote  telnet
       server)

       /dev/ctty01:prts:pr3k:1:rtelnet:

       2. The same device, but with an IP address pr3k_port1 associated to the serial port (IP-based port addressing)

       /dev/ctty01:prts:pr3k_port1:0:rtelnet:

       3. Device on a PathRAS Terminal Server pr3k Port 2, accessed through /dev/ctty02 device file name, using socket protocol (socket server)

       /dev/ctty02:path:pr3k:2:socket:

FILES

       /etc/cyclades-devices	This file

SEE ALSO

       cyclades-serial-client(1), cyclades-ser-cli(1)

															       cyclades-devices(5)