what is the advantage of unix sockets? Post: 302525367

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Top Forums UNIX for Dummies Questions & Answers what is the advantage of unix sockets? Post 302525367 by DGPickett on Thursday 26th of May 2011 12:55:41 PM

05-26-2011

Registered User

TCP and UDP are different facilities under IP, but UNIX sockets are local to the host and simpler, like pipes.

TCP creates a reliable one on one session between a client and server, with full duplex streams of data.

UDP is a user-level packet facility, without 'reliability' but with broadcast and mixed correspondent capability as well as a 'connection' facility, just a fd with a filter and default correspondent. For instance, DNS uses UDP, and a DNS server sits there receiving packets, and for every packet in, makes a packet out. The packet in may be a request for local data, a request for remote data or a response to a past inquiry sent by this server to other DNS servers. The server sends a response to the inquiry, or if tasked with recursion, an inquiry for the inquiry. For responses, the server sends them on to the requestor and caches them locally. The server does all this with one not-connected UDP socket.

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LEARN ABOUT SUNOS

in.daytimed

in.daytimed(1M) 					  System Administration Commands					   in.daytimed(1M)

NAME

       in.daytimed - UDP or TCP daytime protocol service daemon

SYNOPSIS

       in.daytimed

       FMRI
       svc:/internet/daytime:default

DESCRIPTION

       FMRI  stands  for  Fault  Management  Resource  Identifier.  It is used to identify resources managed by the Fault Manager. See fmd(1M) and
       smf(5).

       The in.daytimed service provides the server-side of the daytime protocol. This protocol is used for debugging and bandwidth measurement and
       is available on both TCP and UDP transports, through port 13.

       The  in.daytimed  service  is  an inetd(1M) smf(5) delegated service. The in.daytimed detects which transport is requested by examining the
       socket it is passed by the inetd daemon.

       TCP-based service

	   Once a connection is established, the in.daytimed generates the current date and time in ctime(3C) format as 7-bit ASCII and  sends	it
	   through the connection. The server then closes the connection. Any data received from the client side of the connection is discarded.

       UDP-based service

	   The	in.daytimed  listens  for  UDP datagrams. When a datagram is received, the server generates the current date and time in ctime(3C)
	   format as 7-bit ASCII and inserts it in a UDP datagram sent in response to the client's request. Any received data is ignored.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWcnsu			   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Evolving			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       inetd(1M), attributes(5), smf(5)

       RFC 867

SunOS 5.10							    23 Aug 2004 						   in.daytimed(1M)