Re: Unix Domain Sockets

[Jan-Benedict Glaw <jbglaw@lug-owl.de>]

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On Mon, 2005-01-24 17:18:03 -0200, r_zaca <r_zaca@ig.com.br>
wrote in message <20050124_191803_058538.r_zaca@ig.com.br>:
Content-Description: Mail message body
>   Hello everybody, 
> 
>   Does anyone know what a "unix domain socket" is, and how it differ from an 
> "Internet domain socket"? 

Internet domain sockets work with IP addresses and port numbers. A unix
socket merely is a special file on a local file system, a so calles
"fifo". It's created with the "mkfifo" library call or userspace
command.

After you've created a fifo, which is displayed with a 'p' as the
file-type at "ls -l" output, you can open/close/read/write it.

>   If you know a nice site or documentation about this subject, please tell 
> me. 

There's not much to tell about it. It's created once locally, then you
can access it. Keep in mind that it's a purely local thing. You cannot
export it by any means (I've seen people putting it on a shared NFS
filesystem....). The data passed through the fifo is kept within the
operating system's kernel; it's never ever written somewhere onto stable
storage.

MfG, JBG

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